#23: Simultaneously Analyze Analog and Digital Signals

SoundCheck works with both analog and digital hardware, even both at the same time! This makes it easy to simultaneously analyze analog and digital signals for measuring devices ranging from basic analog speakers to the latest Bluetooth devices, USB devices, A2B devices, and more. Even differences in sample rates and internal clocks can be accounted for. No matter your specific hardware requirements, SoundCheck offers the hardware calibration and measurement accuracy you need.

Simultaneously Analyze Analog and Digital Signals in SoundCheck

Learn More About Measuring Mixed Analog and Digital signals

Check out our video demonstrating testing via an A2B Interface.

Check out our video demonstrating Bluetooth testing.

Check out our video demonstrating USB Headset measurement.

More information is also available in the  SoundCheck Manual.

 

Video Script: Simultaneously Analyze Analog and Digital Signals in SoundCheck

Since its 1995 launch, SoundCheck has supported  audio drivers in multiple formats. Today, SoundCheck uses WDM/MME, ASIO, WASAPI and NiDAQmx on Windows and CoreAudio on MacOS. This enables SoundCheck to operate with a wide range of audio hardware including Listen interfaces, 3rd party hardware and in some cases, direct connection to your device under test. It also means that SoundCheck easily supports a wide range of test applications including those that require mixed analog and digital signals. Let’s look at a few examples:

For testing Bluetooth devices such as speakers and headsets, a Bluetooth interface is configured to wirelessly transmit/receive signal from the device under test.

For the speaker or headphone test, the Bluetooth stimulus is digital and the response via the reference microphone or ear simulators is analog.

For the headset microphone test, the test stimulus through the mouth simulator is analog, and Bluetooth response is digital.

For a MEMS digital microphone test, the test stimulus to the reference speaker is analog, the captured response is digital

For an A2B digital microphone test, the test stimulus to the reference speaker is analog, the captured response via the A2B is digital

In some cases, like a USB audio headset, microphone or speaker, the device under test can even be directly connected via USB to the PC, and digital signal can be passed to/from SoundCheck. The possibilities are endless!

Here is SoundCheck’s hardware setup window. Any audio device with a supported audio driver can be configured in SoundCheck. In this hardware setup, I have an AmpConnect 621, a BQC Bluetooth interface and a USB headset. Not only can I easily configure different hardware, but note, analog hardware and digital hardware can peacefully coexist.

Post-processing steps such as resample and frequency shift convert the recorded response’s sampling rate and phase to match the stimulus prior to analysis. Hardware with different sampling rates and even different internal clock crystals can even be managed! Setting up mixed signal hardware is not only easy, but with post-processing we can be confident in our measurement results across analog and digital hardware. As new devices drive the use of additional hardware, SoundCheck can adapt, making your testing possibilities endless.