This tool can be run on any Linux machine, not just a ChromeBook, providied the ALSA audio subsystem is available, and it usually will be. Scripts would be different for different laptop/chromebook devices as the configuration of audio inputs and outputs can be very different across different platforms. It is a command line tool which lends itself to being script driven. This could be handled by using a larger transform space and taking a little more time in processing. More than 7 tones can be used but peak discrimination of the convolved signal becomes more difficult. During that time up to 7 sinsusoidal tones are polyphonically played, captured, Fourier analyzed, a report given and an optional spectrogram created. This test is fast- usually running in 1/2 second per port combination tested. Any missing or unexpected tones are reported. The incoming sound is convolved through a Fourier Transform and the resulting energy peaks are filtered, sorted and compared to the known expected tones. USB/audio dongles can also be tested and the audio output present in a HDMI port can likewise be tested with an appropriate dongle while looping back to an incoming microphone port. The external Mic/Headphone jack can easily be tested but the built-in speakers and microphone can also be tested by placing the ChromeBook/Laptop in a box and arranging for the built-in speaker sound to bounce off a surface and be directed to the built-in microphone.

It performs polyphonic tone synthesis while simultaneously capturing the incoming sound in some form of external audio loopback.

This package intends to be a fast and powerful automated audio test tool.

Chrome audio lab