Audio coder-decoder and self-testing method thereof
An audio coding and decoder technology, applied in analog/digital conversion calibration/testing, instruments, voice analysis, etc., can solve the problems of limited test items, increase chip area and cost, achieve low-cost self-testing, reduce chip area effect on cost
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[0020] At present, the digital-to-analog converters and analog-to-digital converters of some audio codecs on the market contain an arithmetic unit (AU: arithmetic unit). The embodiment of the present invention described below uses these ready-made arithmetic units to perform DFT calculations, and uses newly added additional circuits to analyze the calculation results, thereby replacing the traditional DSP core and achieving self-testing of the audio codec. When testing one channel (for example, the left channel), the arithmetic unit of the other channel (for example, the right channel) must be used for DFT operation, so the audio codec must have more than two channels. In order to simplify the description, the following embodiments are mainly dual-channel, but the present invention is also applicable to audio codecs that support more channels. In the following embodiment, the left channel is tested as an example, and the right channel is responsible for DFT operations. In other em...
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