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

Inactive Publication Date: 2009-11-11
FARADAY TECH CORP
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  • Claims
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AI Technical Summary

Problems solved by technology

The cost of the DSP core 313 and the logic test equipment 320 is lower than the mixed signal test equipment 220, and the test environment is also easy to set up. The disadvantage is that the test items are limited, and because the chip of the audio codec must include the DSP core, the area of ​​the chip will be increased. and cost

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  • Audio coder-decoder and self-testing method thereof
  • Audio coder-decoder and self-testing method thereof
  • Audio coder-decoder and self-testing method thereof

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Embodiment Construction

[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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Abstract

The invention relates to an audio coder-decoder and a self-testing method thereof. The self-testing method comprises the following steps: firstly, a test signal is converted into an analog signal by a first sound channel D/A converter of the audio coder-decoder; secondly, the analog signal is converted into a digital signal by a first sound channel A/D converter of the audio coder-decoder; and thirdly, amplitudes of a plurality of discrete Fourier transform spectrum components of the digital signal are counted by a digital arithmetic unit of a second sound channel D/A converter and a digital arithmetic unit of a second sound channel A/D converter of the audio coder-decoder. Whether the audio coder-decoder passes through a test or not is determined according to the amplitudes of the spectrum components.

Description

Technical field [0001] The present invention relates to an audio codec (audio codec), and more particularly to a built-in selftest (BIST) method of the audio codec. Background technique [0002] Audio codecs are generally used in electronic devices that process voice or music, such as voice recorders or MP3 players. The performance of the audio codec must be tested during mass production, figure 1 The illustration is a traditional test method. The audio codec 110 includes a digital-to-analog converter (DAC: digital-to-analog converter) 111 and an analog-to-digital converter (ADC: analog-to-digital converter). The test signal 121 is a 1KHz digital sine wave. The digital-to-analog converter 111 converts the test signal 121 into an analog signal 122, and then the analog-to-digital converter 112 converts the analog signal 122 into a digital signal 123. The signal to noise and distortion ratio (SNDR) analysis of the digital signal 123 can obtain the test result. The general method is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H03M1/10G10L19/16
Inventor 林哲民陈乔民巫国雄
Owner FARADAY TECH CORP
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