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Teamconnect Ceiling 2 Truvoicelift TeamConnect Ceiling 2 TruVoicelift. Sennheiser‘s Interpretation of Voice Lift. Sennheiser electronic GmbH & Co. KG Am Labor 1, 30900 Wedemark, Germany, www.sennheiser.com AN 1300 v1.0 | 05/21 TruVoicelift TeamConnect Ceiling 2 Content Introduction . 3 Voice Lift in General . 4 Difference to Sound Reinforcement (SR) . 4 Technical Challenges . 5 Distribution of Sound . 5 Room Characteristics . 7 Risk of Feedback . 8 PAG/NAG Calculation . 9 TruVoicelift Mode in TeamConnect Ceiling2 . 10 Automatic Feedback Protection . 10 Unique Frequency-Shifting Technique . 10 Mute Threshold . 10 Mute Interval Time . 10 Noise Gate . 11 Noise Gate - Threshold . 11 Noise Gate - Hold Time . 11 Advanced Exclusion Zones . 12 Priority Zone . 14 Additional TeamConnect Ceiling 2 Benefits . 16 Checklist for Voice Lift Design . 17 Glossary . 18 AN 1300 v1.0 | 05/21 TruVoicelift TeamConnect Ceiling 2 Introduction TeamConnect Ceiling 2 is the leading microphone solution for video and webconferencing around the world . The easy installation and integration combined with the most flexible beamforming tech- nology and advanced zone control distinguish this most powerful microphone from other offerings on the market . The new TruVoicelift feature ensures the best natural speech experience with an outstanding speech intelligibility . Your voice can be heard throughout the room, right to the back row of a classroom, lecture hall or larger boardrooms and more . This document describes what voice lift means in a typical audio-visual (AV) application and which of the challenges an installer might face during the installation . TeamConnect Ceiling 2 with TrueVoice- lift technology makes setup and configuration a lot easier . Overview of TeamConnect Ceiling 2 Features Automatic Beamforming Technology The revolutionizing beamforming technology records all the audio signals in the meeting room . By means of digital signal processing, the position of the person speaking can be determined at any time, regardless of whether he or she is sitting, standing or moving around . The voice is captured evenly throughout the whole room . TruVoicelift This feature allows the person speaking to move freely without worrying about the technology, pro- viding perfect intelligibility for all participants and decreasing possible feedback issues . It allows to significantly increase speech amplification on-site and gives the option to get significantly louder than other solutions on the market . Advanced Exclusion Zones With up to five advanced Exclusion Zones, the customer has 100% flexibility and can precisely define the position of noise sources to be ignored by the beam tracking (vertically and horizontally) in a new, visually powerful 3D optic via Sennheiser Control Cockpit . Priority Zone 100% control by setting a particular area of a room as Priority Zone for the microphone beam to focus on . This zone will be handled prioritized in case of incoming audio signals from different positions in the room at the same time . AN 1300 v1.0 | 05/21 TruVoicelift TeamConnect Ceiling 2 Voice Lift in General The application of voice lift was introduced to evenly distribute the presenter´s natural speech volume despite a long travel distance to the listener . A study has shown that a voice lift is typically needed from a distance of 8 m (26 ft) from the person presenting . In special situations, where a person does not talk loudly, voice lift can be beneficial in even smaller rooms (For example, in speeches by an authoritarian person where the speech volume is predominantly in low pitches) . The goal is always to achieve speech intelligibility for all participants in a room . Difference to Sound Reinforcement (SR) Often, traditional AV conference rooms are equipped with Sound Reinforcement Systems (SR) or Public Address (PA) Systems . Although these systems focus on audio transmission, they may not be suitable for meeting or presentation applications . PA / SR System Voice Lift System With a conventional PA/SR system, all signals The key of a voice lift system is to keep the received in the room are reinforced to the point level of speech at a constant level despite where even the most distant presenter can be various distances in the room - even so that understood . the voices appear as clear, close and natural as possible without a hint of an artificial note To achieve a sufficient Gain-Before-Feedback and feedback . (GBF), the microphones must be worn very close to the body . The front of stage loudspeakers have Voice lift system amplifies the audio signals to be quite loud to reach the far-end of the room . individually while increasing the speech level This leads to different volume levels in the room . by 3 to 6 dB above the noise floor . The conversation of a presenter in front of a large Microphones and loudspeakers are divided audience is usually only possible unidirectionally into different zones and can be level controlled and makes the direct interactivity between the by external DSP . participants very challenging . AN 1300 v1.0 | 05/21 TruVoicelift TeamConnect Ceiling 2 Technical Challenges Despite decisive advantages over a PA/SR system, there are technical considerations to be made when designing a typical voice lift application (see „Checklist for Voice Lift Design“) . These special demands are described in detail below and show the complexity that an intelligent voice lift system must deal with in order to be best equipped for everyday challenges . Distribution of Sound The Inverse Square Law (ISL) states that every doubling from the sound source reduces the sound pressure level by 6 dB . This means that the sound energy decreases in intensity with each additional square from the source when distributed over a larger area . Based on ISL, most voice lift applications are designed for rooms of 10 x 10 m (33 x 33 ft) or larger . The distance from the presenter to the farthest listener should be at least 8 m (26 ft) or more . Depending on the room acoustics, ambient noise and the presenter‘s speaking volume, a voice lift may also be required in a smaller room . Inverse Square Law - 6 dB - 6 dB - 6 dB 70 dB 64 dB 58 dB 52 dB 0 m (0 ft) 1 m (3 ft) 2 m (7 ft) 3 m (10 ft) 4 m (13 ft) Calculation example At a natural speech level of 70 dB, different values arrive depending on the position of the listener . Every doubling of the distance means a loss of 6 dB at the same time . While no additional gain is required at a distance of 1 m due to the good speech intelligibility, at a distance of 8 m (26 ft) the direct sound will have a level of approximatly 46 dB with a delay of 23 ms . This leads to the fact that the loss of sound energy must be compensated by additional voice lift . 3 m (10 ft) + 0 dB + 6 dB + 9 dB 2 m (7 ft) 4 m (13 ft) 6 m (20 ft) Distance to talker 0 m (0 ft) 1 m (3 ft) 2 m (7 ft) 4 m (13 ft) 6 m (20 ft) 8 m (26 ft) 10 m (33ft) Attenuation of level 70 dB 64 dB 58 dB 52 dB 49 dB 46 dB 43 dB Gain to be added 0 0 0 + 6 dB + 9 dB + 12 dB + 15 dB Approx . delay to be added 0 2 9. ms 5 .8 ms 11 7. ms 17 .5 ms 23 ms 30 ms AN 1300 v1.0 | 05/21 TruVoicelift TeamConnect Ceiling 2 Distribution of Sound with TeamConnect Ceiling 2 Zone Control The even distribution of sound in the room without feedback can be created by splitting the loudspe- akers and microphones into different zones . Considering the size and acoustics of the room, the number of listeners, the distance between microphones and loudspeakers, and the polar pat- tern of the chosen loudspeaker will determine the positioning and number of zones needed . In order to determine how loud your system needs to be for even coverage and speech intelligibility in the room, the Potential Acouastic Gain (PAG) and the Needed Acoustic Gain (NAG) need to be calculated first (see „PAG/NAG Calculation“) . Sound Control of the Presenter Example: If the presenter is at the front of the room, the loudspeaker level can be distributed evenly increasing from this zone to the furthest listener . Depending on the distances of the speaker and the listeners, an ideal mix-minus is calculated in the DSP (Digital Signal Processing) and a well- balanced mix is distributed via a matrix mixer for each zone . Mix-minus is muting or lowering the volume in speaker zones that have active microphones, eliminating the potential of feedback . Mix-minus is also used when incorporating more then one TeamConnect Ceiling 2 microphone zone for audi- Sound Control of the Audience ence participation . Sound Control When operating multiple open microphones at the same time, the distribution of systems must always be balanced . As lively as the interaction between the speakers and the audience can be, it is important to manage the interaction between mcirophones and presenter . To manage active microphones and loudspeakers, it is recommen- ded to use external DSP for zone controlling with automatic mixers . This both improves intelligi- bility and scales GBF significantly . To give each loudspeaker zone the desired sub-mix, automixers are complemented with powerful matrix mixers . Using equalisers (EQ) and notch filters, mixed signals can be granularly fine-tuned to the given room size . Pick-up of Audience´s Voice AN 1300 v1.0 | 05/21 TruVoicelift TeamConnect Ceiling 2 Room Characteristics While outside reflections are negligible due to di- stances, they are mandatory in an enclosed space when it comes to designing a voice lift system . Nearly all surfaces contain properties that fun- damentally change the resonances at different frequencies .
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