Audio feedback test

Details Audio feedback test Audio feedback test

2011-01-18

2011-01-18

Lee, Ping (Department: 2614)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C381S058000

Reexamination Certificate

active

07873427

ABSTRACT:
Methods and systems provide automated testing of computer facilitated audio input and output devices. A tone is converted from a digital to analog signal and is sent to a sound mixing device. At the sound mixing device, the analog tone is looped back through a recording line to an analog to digital converter. The recorded tone is converted from a time domain to a frequency domain using a Fast Fourier Transform (FFT) analysis. The frequency, and if desired, the intensity of the recorded tone is compared against the known frequency and at the desired intensity of the played tone. If the recorded tone is the same as the played tone, the ability of the sound card to play the tone is designated as passing.

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American Megatrends AMIDiag for Windows User's Guide (Version 2.0), Feb. 25, 2002, http://ami.com/support.docc/MAN-DIAG-WIN.pdf.

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