Automotive Audio
Automotive Audio Testing Any Car Audio System, Any Measurement
• Microphone Array • Active Noise • Head Unit Cancellation (ANC)
• Speakers • Bluetooth Performance
••Infotainment
••Hands Free
••Voice Recognition
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 USB and with individual MEMs devices, as well array to a person in the driver’s seat both as analog connections, with and without background noise can be SoundCheck can handle evaluated. Documentation options range from the complexity and comprehensive Microsoft Word or Excel reports demands of testing in to simple pass/fail outputs or automatic database today’s vehicles. writing. Measurements include: Repeatable, automated tests are quickly and easily • Speaker/system response created, modified and saved using the simple • Speaker/panel buzz, squeak and rattle point-and-click interface. Complex sequences can • Bluetooth audio performance be developed to meet specific automotive test • Head unit and amplifier response & THD+N requirements, for example performance of active • Microphone/microphone array response road noise cancellation, microphone directivity • Active noise cancellation effectiveness and spatial reproduction. • 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 design allows it to perform in the R&D laboratory Automotive test result in SoundCheck showing frequency response and distortion based on sine wave, music and pink noise. as well as the end of the production line. In addition to interfacing with the audio Complete flexibility in stimulus choice enables measurement hardware (audio interface, HATS, any test signal (even music) to be used as stimuli. microphone, coupler etc.) the software can also Virtual instruments offer the functionality of control the vehicles head unit to adjust L/R and stand-alone hardware on your laptop. Advanced fader balance.
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
Test signal SoundCheck® Automotive Car Bluetooth Speaker BQC-4148 Bluetooth console / head unit Interface
Head Unit
3.5” on top of instrument panel ™ Aux. In USB AudioConnect Audio Audio Interface Output 1
6.5” in front door AudioConnect Audio Inputs 1&2
SCM™ measurement microphone on front arm rest SoundConnect 2 Head and Torso Simulator SoundConnect 2™ Microphone power supply
6x9 in parcel shelf Bluetooth in-car microphone test
SoundCheck® Recorded waveform BQC-4148 Bluetooth Car Microphone or Interface Microphone Array AudioConnect™ Head Unit AudioConnect audio interface
AudioConnect™ USB ® Audio Audio Interface SoundCheck Input 1 Audio Output 1
AudioConnect
Mouth Input
USB Head and Torso Simulator
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