Using Extra Loudspeakers and Sound Reinforcement a Guide to Provide a Better Auditory Experience

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Cisco Webex SX80 and Codec Pro Based Systems Using Extra Loudspeakers and Sound Reinforcement A guide to provide a better auditory experience

D1536505D1536505 Cisco TelePresence Using Produced:Extra Loudspeakers March 2019 for CE9.7 and SoundAll contents Reinforcement © 2016–2019 Cisco Systems, Inc. All contents © 2016–2019 CiscoAll Systems, rights Inc. reserved All rights reserved. 2 Contents What’s in this guide

Contents Introduction...... 3 Codec SX80: Use with Extra Loudspeakers (I)...... 4 Codec SX80: Use with Extra Loudspeakers (II)...... 5 Codec SX80: Expanding Scenario to Include Local Presenter (I)....6 Codec SX80: Expanding Scenario to Include Local Presenter (II)...7 MX700/800: Use with Extra Loudspeakers...... 8 MX700/800: Use with Extra Loudspeakers...... 9 MX700/800: Expanding Scenario to Include Local Presenter...... 10 MX700/800: Expanding Scenario to Include Local Presenter...... 11 Codec Pro: Use with Extra Loudspeakers (I)...... 12 Codec Pro: Use with Extra Loudspeakers (II)...... 13 Codec Pro: Expanding to Include Local Presenter (I)...... 14 Codec Pro: Expanding to Include Local Presenter (II)...... 15 Audio Console — Customizing the Audio Connections...... 16 The Audio Console Panel...... 17 Setting Up the Equalizer...... 18

When using the Codec Pro or the SX80, In need of a little inspiration when it Main you may want to use more than one pair of loudspeakers comes to designing video meeting loudspeakers in the room to enhance the scenarios? overall auditory experience. Check out Project Workplace (https:// When using the Codec Pro or SX80 with local projectworkplace.cisco.com/#/) which sound reinforcement, extra loudspeakers are Extra may serve as inspiration when you strongly recommended to ensure that people in loudspeakers want to build your perfect meeting the room get the good auditory experience. scenarios, explore our collaboration To set up the system we recommend to use the products, and discover experiences. Audio ConsoleNEW. Typical scenarios when a codec is used with extra loudspeakers. Alternatively, you may use parts of the API of the codec. The use of Audio Console to set up a system for local reinforcement is discussed at the end Main loudspeakers of this document. We recommend delaying the sound from the extra set of loudspeakers to take advantage of the Haas effect. Extra loudspeakers The Haas effect (also known as the Precedence effect) causes humans to localize sound sources in the direction of the first arriving sound despite the presence of a single Typical scenarios when a local presenter (lecturer) uses a wearable microphone reflection from a different direction. A single and local reinforcement is used to enhance the auditory experience in the room. reflection arriving within 5–30 ms can be up to 10 dB louder than the direct sound without About Microphones and Echo Cancelling being perceived as a secondary auditory event. If no more than 8 microphones are required, we do recommend that you stick to To a listener located in sweet spot, the two the 8 independent built-in echo cancelers of the codec. These are high-quality extra loudspeakers will combine into a single cancelers closely integrated with the internal mixer, loudspeaker sound processing phantom source and thus cause no violation of and the general signal flow inside the codec. the single reflection requirement. The use of external echo cancelers will normally introduce additional delay with reduced lip-sync performance as a result. In addition, you will experience increased cost of installation and maintenance.

D1536505 Cisco TelePresence Using Extra Loudspeakers Note We do not recommend using local reinforcement in combination with SpeakerTrack. and Sound Reinforcement All contents © 2016–2019 Cisco Systems, Inc. All rights reserved. 4 Codec SX80: Use with Extra Loudspeakers (I) Connecting to the Codec

Main loudspeakers Extra loudspeakers The illustration at left shows the external connections needed. Note that, for clarity, the camera connections have been omitted. The illustration shows a configuration using passive loudspeakers and a power amplifier. Active loudspeakers (with built-in power amplifiers) may, of course, be used instead. You may use any number of local microphones. Shown here is the maximum number the codec supports, which is 8 microphones — see Local microphones also “About Microphones and Echo • Line outputs 1– 4 are standard Cancelling” on page 3. “speaker outputs” (line level) that go LAN through the volume control. Your presentation source may be • Line outputs 5 and 6 are “record connected using either HDMI or DVI. In outputs” that contain local the latter case, audio must be provided microphones as well as far end and program material. separately to the codec, as shown. • The example shown here reflects the codec’s standard behavior. This For clarity, the HDMI PC-input audio may easily be modified by means of alternative has been omitted in the the Audio Console (described later in this document). illustration of the internal signal paths shown on the following page.

(For clarity, no camera connections are shown)

Touch 10 Display(s) D1536505 Cisco TelePresence Using Extra Loudspeakers and Sound Reinforcement All contents © 2016–2019 Cisco Systems, Inc. Presentation All rights reserved. source 5 Codec SX80: Use with Extra Loudspeakers (II)

• For the initial configuration when • A further 5–30 ms of delay setting this up, we recommend should be added to the the use of a sound source calculated delay difference to connected to the video system take advantage of the Haas as “local presentation outside effect — see page 3 for more on l1 l2 a call”. Make sure you use a this. signal with a representative The exact amount of delay is content and signal level, as well difficult to predict, try listening to l3 l4 as sufficient dynamic range. the entire system while adjusting Recorded speech should be a the delay. Use the sweet spot. part of this signal. Sweet spot Ideally, you should hear a rich The sweet spot is normally the position where things We recommend that level • sound without being very much should sound the best. We recommend that you apply setting on the audio output a delay setting to the extra loudspeakers to make things aware of the presence of the connectors is kept at its default sound better. This will require that you measure the extra loudspeakers, while at the value (-10) distances shown—see text for more. same time it should be clearly The extra loudspeakers’ level noticable when you switch off SX80 should then be set as suitable, the extra loudspeakers. Audio from Far End (including any Far End PC-input audio) using the loudspeakers’ own gain controls. • This delay adjustment may involve output level adjustment Master Volume Gain This will leave a range of –14 dB for the extra loudspeakers, but to +10 dB available for further not necessarily.

adjustments, which will be PC-input audio & Far PC-input audio needed if compensation for Use output level in the codec End audio sent to main • loudspeakers many people present in the API to adjust the balance room calls for a different level. between the main and extra Audio to Far End loudspeaker sets. Define a sweet spot (normally • The entire setup should then PC-input audio the position where things should • be tested with people in the sound the best). room, alternatively with an • Measure the distance between amount of absorption material corresponding to such a Delay the sweet spot and all of the Adaptive PC-input situation. echo loudspeakers, as shown at right. audio and cancelers Far End This may call for further level Gain You should now introduce a audio sent • adjustments, as outlined above. to extra delay to the sound from each of loudspeakers the extra loudspeakers. • Be sure to make a video call to PC-input audio This delay will correspond to the test that the far end experience D1536505 distances – and – . has the quality required. Cisco TelePresence l1 l3 l2 l4 Using Extra Loudspeakers As a rule of thumb, use 3 ms and Sound Reinforcement delay per meter. All contents © 2016–2019 Cisco Systems, Inc. All rights reserved. 6 Codec SX80: Expanding Scenario to Include Local Presenter (I) Connecting to the Codec

Main loudspeakers Extra loudspeakers The illustration at left shows the external connections needed when expanding the scenario to include a local presenter. The only difference from the original scenario is the introduction Wireless microphone of a wireless microphone and its base for local presenter station (shown in green). The use of a wireless microphone is not mandatory, wired microphones may also be used. In addition, you may also use any of Wireless the microphone inputs for the local microphone presenter. If you need more than one base station for this, use the number needed, just observe the danger of feedback if care Local microphones has not been taken (see the following • Line outputs 1– 4 are standard page for more on this). “speaker outputs” (line level) that go LAN through the volume control. Note that, for clarity, the camera • Line outputs 5 and 6 are “record connections have been omitted. outputs” that contain local microphones as well as far end and The illustration shows a configuration program material. using passive loudspeakers and a • The example shown here reflects the codec’s standard behavior. This power amplifier. Active loudspeakers may easily be modified by means of the Audio Console (described later (with built-in power amplifiers) may, of in this document). course, be used instead. You may use any number of local microphones. Shown here is the maximum number the codec supports, which is 8 microphones — see also “About Microphones and Echo

(For clarity, Cancelling” on page 3. no camera connections are In the illustration, the wireless shown) microphone is connected to Input No.1, but you may connect it to any of the 8 Inputs. Your presentation source may be Touch 10 connected using either HDMI or DVI. In Display(s) D1536505 the latter case, audio must be provided Cisco TelePresence separately to the codec, as shown. Using Extra Loudspeakers For clarity, the HDMI PC-input audio and Sound Reinforcement alternative has been omitted in the All contents © 2016–2019 illustration of the internal signal paths Cisco Systems, Inc. Presentation All rights reserved. source shown on the following page. 7 Codec SX80: Expanding Scenario to Include Local Presenter (II)

• We assume that you have • Another strategy will be to use • Adjust the gain settings so that • You may want to fine-tune the already set up your SX80 Line out of the base station and the codec input levels are the delay at this stage. In the below example two microphones are to work with a set of extra reduce the input sensitivity of same for all microphone inputs, used for the local reinforcement, feel free to The entire setup should then loudspeakers, as described on the codec accordingly. for a given sound level. • use any number of the 8 microphones. be tested with people in the the previous page. The codec full scale level is Should you now need to adjust room, alternatively with an Note We do not recommend that you combine 22 dBu. If you have a base • Use a dedicated (and closely the sound level, use the following amount of absorption material local reinforcement and SpeakerTrack. mounted) microphone for the station supplying e.g. 18 dBu, guidelines: corresponding to such a presenter, preferably of the you should not set the codec situation. Use Mixer Gain of the Audio wearable type. input level higher than 4. • Console to amplify the local This may call for further level This will ensure high quality Each step of the codec input presenter. adjustments, as outlined above. audio with low loudness variation level setting corresponds to 1dB Use Master Volume to amplify Be sure to make a video from the presenter and low gain. For more on this, consult • • PC-input audio and far-end call to test that the far end sensitivity towards other audio the SX80 Physical Interface audio. The local presenter will experience has the quality sources. It is important that the Guide. not be affected by this. required. presenter microphone does not • Furthermore, we do pick up much of the audio from recommend that any kind of SX80 the loudspeakers, when local processing in the base station Audio from Far End (including any Far End PC-input audio) reinforcement of the presenter is avoided. We are here thinking audio is used. of such things as dynamic EQ, Master This serves to avoid strong compression, noise reduction, Volume Gain reverberation, coloration and in AGC, de-essing etc. These

the worst case feedback, of the types of time-varying and/or PC-input audio & Far PC-input audio non-linear processing may be End audio sent to main presenter audio. loudspeakers detrimental to the codec’s echo Other microphones in the cancelling performance. Fixed Audio to Far End room, e.g. ceiling mounted EQ, however, should cause no Microphones Microphone microphones may still be for local reinforcement problem. PC-input audio operating, but not as a substitute presenter gain for the personal microphone. • The input signal level from the wearable microphone should Gain The wearable microphone will • be checked using the VU-meter Local typically be of the wireless type Delay presenter, feature of the codec. Green Adaptive with a base station. PC-input echo with occassional appearances audio and cancelers In order to avoid clipping of the of yellow is considered good. Gain Far End audio sent codec’s microphone input, you Note that there is no peak hold, to extra may want to set the base station so testing by listening will be loudspeakers output to Mic out, rather than needed. Use the gain control of PC-input audio Line out. the microphone base station to D1536505 adjust the microphone level, if If you do so, make sure the base Cisco TelePresence needed. Using Extra Loudspeakers station is not suffering damage and Sound Reinforcement from the phantom voltage All contents © 2016–2019 supplied by the codec. See also Cisco Systems, Inc. Appendix for more. All rights reserved. 8 MX700/800: Use with Extra Loudspeakers Connecting to the Endpoint

The illustration at left shows the external connections needed. Note that, for clarity, the camera connections have been omitted. The illustration shows a configuration using passive loudspeakers and a • Line outputs 1 and 2 are power amplifier. Active loudspeakers standard “speaker outputs” (line level) that go through the (with built-in power amplifiers) may, of volume control. Extra loudspeakers course, be used instead. • Line outputs 3 and 4 are “line outputs” that bypass the volume You may use any number of local control. microphones. Shown here is the maximum • Line outputs 5 and 6 are “record outputs” that contain number the MX700/800 supports, which local microphones as well as far is 8 microphones — see also “About end and program material. MX700 and MX800 Dual only Microphones and Echo Cancelling” on Video and audio to the page 3. MX700/800 screen and the built-in loudspeakers Your presentation source may be connected using either HDMI or DVI. In the latter case, audio must be provided separately to the endpoint, as shown. For clarity, the HDMI PC-input audio alternative has been omitted in the illustration of the internal signal paths Presentation shown on the following page. Local source microphones

(For clarity, no camera connections are shown)

For the initial configuration when As a rule of thumb, use 3 ms • We do recommend the use of MX700/800 setting this up, we recommend delay per meter. PC-input audio the use of a sound source “Audio Console — Customizing connected to the video system • A further 5–30 ms of delay the Audio Connections” on as “local presentation outside should be added to the page 16 to set up this calculated delay difference to behavior. a call”. Make sure you use a Master PC-input audio and signal with a representative take advantage of the Haas Volume Far End audio sent to extra loudspeakers content and signal level, as well effect — see page 3 for more on as sufficient dynamic range. this. Gain Delay Gain Recorded speech should be a The exact amount of delay is part of this signal. difficult to predict, try listening to PC-input audio and the entire system while adjusting Far End audio sent to • We recommend that level built-in loudspeakers setting on the audio output the delay. Use the sweet spot. connectors is kept at its default Ideally, you should hear a rich value (-10). sound without being very much The extra loudspeakers’ level aware of the presence of the should then be set as suitable, external loudspeakers, while using the loudspeakers’ own at the same time it should gain controls. be clearly noticable when you switch off the external This will leave a range of –14 dB loudspeakers. to +10 dB available for further adjustments, which will be • This delay adjustment may needed if compensation for involve output level adjustments, Adaptive echo many people present in the but not necessarily. cancelers room calls for a different level. • Use Output level in the codec API PC-input audio Audio to Far End Define a sweet spot (normally to adjust the balance between • Audio from Far End (including any Far End PC-input audio) the position where things should the integrated and extra loud- sound the best). speakers. The entire setup should then Measure the distance between • • be tested with people in the the sweet spot and both of the room, alternatively with an extra loudspeakers, as well as amount of absorption material the distance between the sweet corresponding to such a spot and the video system, as situation. shown at right. This may call for further level • You should now introduce a adjustments, as outlined above. D1536505 delay to the sound from each of l3 ls l4 Cisco TelePresence the external loudspeakers. • Be sure to make a video call to The sweet spot is normally the position where things Using Extra Loudspeakers test that the far end experience should sound the best. We recommend that you apply a This delay will correspond to the and Sound Reinforcement has the quality required. delay setting to the extra loudspeakers to make things sound All contents © 2016–2019 distances ls – l3 and ls – l4. better. This will require that you measure the distances shown— Cisco Systems, Inc. Sweet spot see text for more. All rights reserved. 10 MX700/800: Expanding Scenario to Include Local Presenter Connecting to the Endpoint

The illustration at left shows the external connections needed when expanding the scenario to include a local presenter. The only difference from the original scenario is the introduction of a wireless microphone and its base station (shown in green). • Line outputs 1 and 2 are The use of a wireless microphone is standard “speaker outputs” (line level) that go through the not mandatory, wired microphones Extra loudspeakers volume control. may also be used. In addition, you may • Line outputs 3 and 4 are “line also use any of the microphone inputs outputs” that bypass the volume control. for the local presenter. If you need • Line outputs 5 and 6 are more than one for this, use the number “record outputs” that contain local microphones as well as far needed, just observe the danger of end and program material. MX700 and MX800 Dual only feedback if care has not been taken (see the following page for more on Video and audio to the this). MX700/800 screen and the built-in loudspeakers Note that, for clarity, the camera connections have been omitted. The illustration shows a configuration using passive loudspeakers and a power amplifier. Active loudspeakers Wireless microphone (with built-in power amplifiers) may, of for local presenter Presentation course, be used instead. source Local You may use any number of local microphones microphones. Shown here is the maximum number the MX700/800 Wireless supports, which is 8 microphones — see microphone (For clarity, no camera connections are shown) also “About Microphones and Echo base station Cancelling” on page 3. In the illustration, the wireless microphone Wireless is connected to Input No.1, but you may microphone connect it to any of the 8 Inputs. base station Your presentation source may be LAN Touch 10 connected using either HDMI or DVI. In D1536505 the latter case, audio must be provided Cisco TelePresence separately to the endpoint, as shown. Using Extra Loudspeakers For clarity, the HDMI PC-input audio and Sound Reinforcement alternative has been omitted in the All contents © 2016–2019 illustration of the internal signal paths Cisco Systems, Inc. All rights reserved. shown on the following page. 11 MX700/800: Expanding Scenario to Include Local Presenter

We assume that you have already by the codec. See also Appendix Should you now need to adjust • MX700/800 set up your MX700/800 to work for more. the sound level, use the following PC-input audio with a set of extra loudspeakers, guidelines: Another strategy will be to use as described on the previous • Line out of the base station and Use MicrophoneReinforce- page. • reduce the input sensitivity of the ment Gain to amplify the local Use a dedicated (and cloesly codec accordingly. presenter. Master Local presenter, PC-input audio and • Volume Far End audio sent to extra loudspeakers mounted) microphone for the The codec full scale level is 22 dBu. Use Master volume to amplify presenter, preferably of the • If you have a base station supplying PC-input audio and far-end audio. wearable type. Gain Delay Gain e.g. 18 dBu, you should not set the This will not influence the level of This will ensure high quality audio codec input level higher than 4. the local presenter. PC-input audio and Gain Microphone with low loudness variation from Far End audio sent to reinforcement Each step of the codec input You may want to fine-tune the gain the presenter and low sensitivity • built-in loudspeakers level setting corresponds to 1dB delay at this stage. towards other audio sources. It is gain. For more on this, consult the Finally, the entire setup should important that the presenter mi- SX80 Physical Interface Guide. • Microphones crophone does not pick up much then be tested with people in for local presenter of the audio from the built-in • Furthermore, we do recommend the room, alternatively with an loudspeakers of the MX700/800 that any kind of processing in the amount of absorption material or the extra loudspeakers, when base station is avoided. We are corresponding to such a situation. local reinforcement of the pre- here thinking of such things as This may call for further level senter audio is used. dynamic EQ, compression, noise reduction, AGC, de-essing etc. adjustments, as outlined above. This serves to avoid strong These types of time-varying and/ Be sure to make a video call to reverberation, coloration and in • or non-linear processing may be test that the far end experience the worst case feedback, of the detrimental to the codec’s echo has the quality required. Adaptive echo presenter audio. cancelling performance. Fixed cancelers Other microphones in the room, EQ, however, should cause no PC-input audio e.g. ceiling mounted microphones problem. We do recommend the use of Audio to Far End may still be operating, but not “Audio Console — Customizing Audio from Far End (including any Far End PC-input audio) The input signal level from the as a substitute for the personal • the Audio Connections” on wearable microphone should microphone. page 16 to set up this be checked using the VU-meter behavior. • The wearable microphone will feature of the codec. Green with typically be of the wireless type occassional appearances of with a base station. yellow is considered good. Note that there is no peak hold, so In order to avoid clipping of the testing by listening will be needed. codec’s microphone input, you Use the gain control of the may want to set the base station In the above example two microphones are used for the local microphone base station to adjust output to Mic out, rather than Line reinforcement. This is just an example, feel free to use any number of the the microphone level, if needed. D1536505 out. 8 microphones. Cisco TelePresence Adjust the gain settings so that Using Extra Loudspeakers If you do so, make sure the base • Note We do not recommend that you combine local reinforcement and the codec input levels are the and Sound Reinforcement station is not suffering damage SpeakerTrack. same for all microphone inputs, All contents © 2016–2019 from the phantom voltage supplied Cisco Systems, Inc. for a given sound level. All rights reserved. 12 Codec Pro: Use with Extra Loudspeakers (I) Connecting to the Codec

Loudspeakers must be active or connected to a power amplifier. The Codec Pro section of this document Loudspeakers, Microphones, applies to Cisco Room 70 G2 as well. mono or stereo max 8 Power The illustration at left shows the external connections needed. You may use any number of local microphones (up to 8) — see also “About Microphones and Echo Cancelling” on page 3.

For Cisco Room 70 G2, sockets Nos 1 and 2 are used for the system’s internal monitor(s)

Audience Camera

Remote Remote Presenter Audience Display Display

Presentation Computer Network Touch 10 Display (for presentation) (LAN)

• For the initial configuration when • A further 5–30 ms of delay setting this up, we recommend should be added to the the use of a sound source calculated delay difference to connected to the video system take advantage of the Haas as “local presentation outside effect — see page 3 for more on a call”. Make sure you use a this. signal with a representative The exact amount of delay is content and signal level, as well l1 l2 difficult to predict, try listening to as sufficient dynamic range. the entire system while adjusting Recorded speech should be a the delay. Use the sweet spot. part of this signal. Ideally, you should hear a rich We recommend that level • sound without being very much setting on the audio output l3 l4 aware of the presence of the connectors is kept at its default extra loudspeakers, while at the value (-4) Use Audio Console to set things up in same time it should be clearly Tip: a web browser. The extra loudspeakers’ level noticable when you switch off The sweet spot is normally the position where things should sound the best. We recommend that you apply should then be set as suitable, the extra loudspeakers. a delay setting to the extra loudspeakers to make using the loudspeakers’ own This delay adjustment may The below illustration shows the internal signal things sound better. This will require that you measure gain controls. • paths of the Codec Pro when used for local the distances shown—see text for more. involve output level adjustment reinforcement with extra loudspeakers. This will leave a range of –20 dB for the extra loudspeakers, but to +4 dB available for further not necessarily. PC-input audio adjustments, which will be needed if compensation for • Use output level in the codec API to adjust the balance (including any Far End PC-input audio) many people present in the AudioAudio to Far toEnd Far End Master room calls for a different level. between the main and extra Volume Gain loudspeaker sets. PC-input audio

Define a sweet spot (normally Audio from Far End

sent to main loudspeakers and Far End audio • The entire setup should then PC-input audio the position where things should • be tested with people in the sound the best). room, alternatively with an Delay Measure the distance between amount of absorption material • corresponding to such a Adaptive Gain the sweet spot and all of the echo situation. loudspeakers, as shown at right. cancelers PC-input This may call for further level audio & Far You should now introduce a End audio • adjustments, as outlined above. delay to the sound from each of sent to extra loudspeakers the extra loudspeakers. Be sure to make a video call to D1536505 • Cisco TelePresence This delay will correspond to the test that the far end experience Using Extra Loudspeakers has the quality required. distances l1 – l3 and l2 – l4. and Sound Reinforcement All contents © 2016–2019 As a rule of thumb, use 3 ms Cisco Systems, Inc. delay per meter. All rights reserved. 14 Codec Pro: Expanding to Include Local Presenter (I) Connecting to the Codec

Loudspeakers must be active or connected to a power amplifier. The Codec Pro section of this document Loudspeakers, Microphones, applies to Cisco Room 70 G2 as well. mono or stereo max 8 Power The illustration at left shows the external connections needed when expanding the scenario to include a local presenter. The only difference from the original scenario is that some of the microphones (one or more) are used by the local presenter. Microphones can be wired or wireless. However, it is important to get the microphone as close to the source as possible to minimize the required microphone gain and thereby maximize For Cisco Room 70 G2, sockets Nos 1 and 2 are used for the the feedback margin. system’s internal monitor(s) In addition, you may also use any of the microphone inputs for the local presenter. If you need more than one for this, use the number needed, just observe the danger of feedback if care has not been taken (see the following page for more on this). This setup also includes a Presenter Audience camera (shown in red). Camera You may use any number of local Presenter microphones. Remote Remote Camera Presenter Audience Display Display

Presentation Computer Network Touch 10 Display (for presentation) (LAN)

We assume that you have Another strategy will be to use Adjust the gain settings so that You may want to fine-tune the • • • • In the below example two microphones are already set up your Codec Line out of the base station and the codec input levels are the delay at this stage. used for the local reinforcement, feel free to Pro to work with a set of extra reduce the input sensitivity of same for all microphone inputs, The entire setup should then use any number of the 8 microphones. loudspeakers, as described on the codec accordingly. for a given sound level. • be tested with people in the the previous pages. The codec full scale level is Should you now need to adjust room, alternatively with an Note We do not recommend that you combine • Use a dedicated (and closely 22 dBu. If you have a base the sound level, use the following amount of absorption material local reinforcement and SpeakerTrack. mounted) microphone for the station supplying e.g. 18 dBu, guidelines: corresponding to such a presenter, preferably of the you should not set the codec situation. Use Audio Console to amplify wearable type. input level higher than 4. • the local presenter. This may call for further level This will ensure high quality Each step of the codec input adjustments, as outlined above. Use Master Volume to amplify audio with low loudness variation level setting corresponds to 1dB • PC-input audio and far-end Be sure to make a video from the presenter and low gain. For more on this, consult • audio. The local presenter call to test that the far end sensitivity towards other audio the Codec Pro Physical Interface will not be affected by this. experience has the quality sources. It is important that the Guide. Applies when the Output Group required. presenter microphone does not Furthermore, we do has been set to be Volume pick up much of the audio from • recommend that any kind of Controlled only. the loudspeakers, when local processing in the base station reinforcement of the presenter is avoided. We are here thinking audio is used. The below illustration shows the internal of such things as dynamic EQ, signal paths of the Codec Pro when used for This serves to avoid strong compression, noise reduction, local reinforcement with extra loudspeakers reverberation, coloration and in AGC, de-essing etc. These and local presenter. the worst case feedback, of the types of time-varying and/or PC-input audio presenter audio. non-linear processing may be Other microphones in the detrimental to the codec’s echo

cancelling performance. Fixed (including any Far End PC-input audio) room, e.g. ceiling mounted Audio Audioto Far toEnd Far End Microphones Master microphones may still be EQ, however, should cause no for local Volume Gain

operating, but not as a substitute problem. PC-input audio presenter

Audio from Far End

sent to main loudspeakers and Far End audio for the personal microphone. The input signal level from the PC-input audio • Gain The wearable microphone will wearable microphone should • Delay typically be of the wireless type be checked using the VU-meter with a base station. feature of the codec. Green Adaptive with occassional appearances Gain echo In order to avoid clipping of the of yellow is considered good. cancelers PC-input codec’s microphone input, you Note that there is no peak hold, audio & Far may want to set the base station so testing by listening will be End audio output to Mic out, rather than sent to extra needed. Use the gain control of loudspeakers Line out. the microphone base station to D1536505 adjust the microphone level, if Cisco TelePresence If you do so, make sure the base Using Extra Loudspeakers station is not suffering damage needed. and Sound Reinforcement from the phantom voltage All contents © 2016–2019 supplied by the codec. Cisco Systems, Inc. All rights reserved. 16 Audio Console — Customizing the Audio Connections Where are the VU-meters?

The Audio Console utility lets you define The Audio Console setup lets you utilize Echo During normal use, the HDMI1 is used to To display the VU-meters, sign in to how audio inputs and outputs should be Control on the part of the microphone signal provide the Codec Pro with video from the the web interface of the codec, then connected together, using simple drag and that is sent to the far end, but at the same cameras of the QuadCam unit and the audio navigate to Setup > Peripherals and drop. time omitting it for the part used locally (by return channel of the same will be used to then down to the microphone VU- assigning that microphone to more than one route the audio from the Codec Pro to the meters. The Audio Console is available for systems logical group). Use Direct On for this, see the loudspeakers of the QuadCam. using SX80 and Codec Pro. next page for more on this.. Alternatively go to Settings > Issues However, if you want to use the setup as just and Diagnostics > Microphone check The Audio Console can be found under Setup You may also apply noise reduction and a TV with a soundbar, the system will send on the Touch10 to display a VU-meter in the Web interface of your video system. equalizer settings to the microphone signal. audio from the monitor to the Codec Pro through HDMI out 1 (ARC) of Codec Pro and per microphone. You start by defining logical input and output A physical output cannot be assigned to more the Codec Pro will send that audio further to groups. The physical inputs and outputs are than a single logical output group. the QuadCam through HDMI1 in (ARC). then assigned to those logical inputs and outputs. In the Codec Pro, a Microphone input is a In order to be able to do this, the monitor Line input with Phantom Feeding activated. must be CEC+ARC enabled. If your setup New logical input and output groups may be makes use of 4k video, make sure the monitor added at all times. Likewise, you may remove supports CEC+ARC in 4k format. logical modules at all times. Using Audio Return Channels Changes applied to the settings are immediately put into effect. In this version HDMI offers, under certain circumstances, saving has been automated, no need to the ability to transmit audio in either direction. worry!NEW When audio is sent in reverse, this is referred to as an Audio Return Channel (ARC). The The logical input and output groups can be Codec Pro supports this. given names defined by you. Consider the below configuration, showing A physical input, e.g. a microphone, can a Cisco QuadCam (top), a monitor (middle), be assigned to more than one input. This and a Codec Pro (bottom) connected via comes in handy when working with local HDMI. The QuadCam will act as both camera reinforcement, typically using a video system and soundbar in this setting. in lecture halls where the local audience also needs to hear what is being said through the microphone.

1 2 D1536505 Cisco TelePresence Using Extra Loudspeakers and Sound Reinforcement All contents © 2016–2019 Cisco Systems, Inc. All rights reserved. 17 The Audio Console Panel For the Codec Pro and the Room 70 G2 there is an automatic mode available. This mode will create a preset of connections The Audio Console can be found under based on connected devices Gain access to the Setup in the Web interface of your detected. You may then modify equalizer setup. this to your liking. video system. To delete a connection or This is the pool of adjust its gain, right-click on physical Output The pool of physical Input the “cable”. connectors not yet connectors available. used. They are therefore considered inactive.

The physical Input connectors are The logical Output assigned to logical Input groups. These groups are similar to the logical Input groups are created by you. logical Input groups, but a physical Output cannot The name of a logical group is be assigned to more specified by you when clicking on than one logical Output New input group. group. A given physical Input connector may be assigned to more than one logical group. Use Drag and Drop. To remove a group or a member of a group hover the mouse over the group or member. An X will appear. Click on this to remove the item. Click here and drag over here to establish a connection A member of a logical group may be between an Input and an expanded to gain access to setup details: Output.

Expand the Logical group rather For local reinforcement than the individual members of the scenarios, set microphones Logical group when using it for to Direct, see text below. local reinforcement.

Use this feature in scenarios with e.g. a presenter’s microphone. This mic will be muted unless the associated camera (the A few things to note: one filming the presenter) actually sends The Codec Pro offers Audio Return Channels (ARC) as video, provided that you have set up a We recommend that you set Delay Mode additional choices (see the previous page for more on this). camera/mic combination this way. to Fixed to avoid potential delay caused by In the Codec Pro, a Microphone input is a Line input external screens. with Phantom Feeding activated. If a Microphone input is converted to Line input, the Phantom Feeding will be switched This is equalizer setting No. 5 Equalizer lets you choose among up off, any mute will be ignored and the Gain value space will be to 8 predefined equalizer settings reduced from 0–70 dB to 0–24 dB. D1536505 (or none, i.e. Off). In local reinforcement scenarios, make sure you set the Cisco TelePresence This version of the Audio Console Microphone(s) to Direct to bypass extra processing like Echo Using Extra Loudspeakers offers a graphical tool to set up the Control. This will minimize latency and also serve to avoid that and Sound Reinforcement equalizer, see the next page for the Master volume control also affects the volume of the local All contents © 2016–2019 more on this. presenter. Cisco Systems, Inc. Expand the logical group to gain access to this, as shown All rights reserved. above. 18 Setting Up the Equalizer

There are 8 user-definable The effect of altering parametric equalizer settings any of the parameters available. in the table below the A setting consists of up to 6 graph, will immediately sections, each of which has its become visible in the own filter type, gain, center/ graph itself. Gain access crossover frequency and Q value. Your settings are saved to the equalizer Each section is shown with its automatically, no need from here own color, while the white line to click a Save button or here. shows the combined frequency anymore. response of the equalizer.

To activate or deactivate a filter section, click here.

Previous setting Next setting (if applicable) (if applicable) Value space for frequency is 20–20 000 Hz. Value space for the gain Value space for Here you define which of setting is 0 dB ±20 dB. Q is 0.1–10.0. the 8 equalizer settings to apply The filter types available (No. 5 in this example).

D1536505 Cisco TelePresence Using Extra Loudspeakers and Sound Reinforcement All contents © 2016–2019 Cisco Systems, Inc. All rights reserved. Americas Headquarters Asia Pacific Headquarters Europe Headquarters Cisco Systems, Inc. Cisco Systems (USA) Pte. Ltd. Cisco Systems International BV Amsterdam, San Jose, CA Singapore The Netherlands Cisco has more than 200 offices worldwide. Addresses, phone numbers, and fax numbers are listed on the Cisco Website atwww.cisco.com/go/offices .

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