Automotive Audio

Automotive Audio Testing Any Car Audio System, Any Measurement

• Microphone Array • Active Noise • Head Unit Cancellation (ANC)

• Speakers • Bluetooth Performance

Audio Test and Measurement System SoundCheck®

algorithms and powerful post processing options Any Car Audio, allow a wide choice of analyses and mathematical Any Measurement operations. SoundCheck offers simple, fast and accurate For example, using a common 6 measurement testing of vehicle audio quality, from individual microphone array, it is possible to measure speaker components to complete in-vehicle sound power, time delays, spatial envelopment infotainment and telematics systems. With and both tonal and stereo balance. Alternatively, interfaces to connect via Bluetooth, Lightning, the response of a telematics microphone array USB and with individual MEMs devices, as well to a person in the driver’s seat both with and as analog connections, without background noise can be evaluated. SoundCheck can handle Documentation options range from comprehensive the complexity and Microsoft Word or Excel reports to simple pass/fail demands of testing in outputs or automatic database writing. today’s vehicles. Repeatable, automated tests are quickly and easily Measurements include: created, modified and saved using the simple •  Speaker/system response point-and-click interface. Complex sequences can •  Speaker/panel buzz, squeak and rattle be developed to meet specific automotive test • Bluetooth audio performance requirements, for example performance of active •  Head unit and amplifier response & THD+N road noise cancellation, microphone directivity •  Microphone/microphone array response and spatial reproduction. • Active noise cancellation effectiveness • Spatial reproduction accuracy The System SoundCheck’s modular combination of hardware and software is cost-effective, flexible and expandable.

At the heart of the system is the SoundCheck software. Powerful, fast and accurate, its scalable Automotive test result in SoundCheck showing frequency response and distortion based on sine wave, music and pink noise. design allows it to perform in the R&D laboratory In addition to interfacing with the audio as well as the end of the production line. measurement hardware (audio interface, HATS, Complete flexibility in stimulus choice enables microphone, coupler etc.) the software can also any test signal (even music) to be used as stimuli. control the vehicles head unit to adjust L/R and Virtual instruments offer the functionality of fader balance (e.g. using an A2B car interface). stand-alone hardware on your laptop. Advanced

2 Audio Test and Measurement System

Listen’s automotive audio test hardware includes: R&D Automotive AudioConnect™ A compact USB audio Testing interface with built in In the R&D lab, headphone amplifier and a power SoundCheck is supply for up to 2 SCM™ microphones. This is a used for voicing the audio system very cost-effective approach for basic headphone Photo courtesy of Brüel and Kjær testing. to the car. This might include speaker positioning and equalization of the system for correct tonal AudioConnect 4x4™ and spatial balance including L/R and front/ A high-precision back balancing. It is also used for microphone audio interface positioning and directivity measurements, and suitable for measuring amplifier THD+N. The noise cancellation performance with simulated AudioConnect 4x4 offers 4 digital and 4 analog and actual road noise. channels in and out, high signal to noise ratio, wide frequency response, and a user-defined End-of-Line sampling rate up to 200kHz. Automotive SoundConnect 2™ A 2-channel microphone or Testing accelerometer power supply At the end of the production line, SoundCheck (SCM, IEPE, 200V polarization) ideal for vibration offers a final audio QC check on the car. Initially a measurements or applications where single measurement of frequency response and polarization is required. Rub & Buzz can be used to ensure that the audio profile measured in the car meets specifications. BTC-4148 and BQC-4148 Bluetooth Interfaces If there are discrepancies, each speaker can then Designed for R&D and be measured independently (including additional production respectively, these measurements such as polarity) to help identify interface any Bluetooth device to SoundCheck, the causes. offering full control over all Bluetooth protocol The microphone(s) can be tested to verify settings and explicit control over the CODEC directional response by performing simple choice and transmitter power. The BQC-4148 is directivity measurements using the car’s own USB powered for easy on-road testing. speakers.

Also available: test microphones, MEMS SoundCheck is also ideal for R&D and production interfaces, amplifiers, speakers, current monitors, line testing of drivers for automotive applications. 3rd party hardware including Head and Torso Please see our loudspeakers brochure for more Simulators (HATS) and more. information.

3 Automotive Audio

TEST CONFIGURATIONS

There are many possible in-vehicle test configurations. These are just a few options for testing Automotive audio.

End of line multi-speaker test Bluetooth in-car speaker test

SoundChec

Car Bluetooth Speaker BC- Bluetooth est sinal nterface Head Unit File FM CD USB Bluetooth BQC USB AudioConnect™ Audio Audio Interface utput Speaker on top Au n of instrument AudioConnect panel Head unit Audio nputs

Speaker in front door

SoundConnect Head and orso Simulator SCM™ SoundConnect 2™ measurement Microhone oer sul microhone in car

Bluetooth in-car microphone test

Speaker in parcel shelf

SoundChec

BC- Bluetooth Car Microphone or SoundChec nterface Microphone Array ecorded Head Unit aveform

AudioConnect™ USB Audio Interface TM Audio AudioConnect nput Audio utput audio interface USB AudioConnect

USB AudioConnect Mouth nput

Head and orso Simulator Production Line

Listen, Inc. 580 Harrison Ave Ste, 3W Boston, MA 02118

Tel: 617-556-4104 Fax: 617-556-4145 Email: [email protected] www.listeninc.com

© Listen, Inc. 2016 Photo courtesy of Brüel and Kjær