REAL-TIME CORRECTION OF DC OFFSET OF LOW-COST AUDIO CODECS IN ACOUSTIC DIGITAL LOCK-IN AMPLIFIERS |
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| Jan Fischer, Jan Vejdelek |
- Abstract:
- In design of the DSP for acoustic applications it is appropriate to integrate a low-cost audio codec into their structure. Audio stereo codecs are able to achieve a high resolution of measurement on low frequencies of the input signal. But audio codecs are able to digitalize only signals of the acoustic origin, it means the signal without the DC part of frequency spectrum. In the majority of available DSP there are 2 independent AD converters and also 2 DA converters. But most of audio codecs create the DC offset during the conversion to the digital form, it means 0V voltage amplitude of input signal doesn’t correspond to 0HEX in hexadecimal form of output digital word. The solution how to achieve the required parameters with these low-cost audio codecs is founded in this project.
- Keywords:
- audio codec, correction of DC offset, digital signal processing
- Download:
- IMEKO-TC4-2002-037.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- TC4 Conference and Workshop 2002
- Title:
- 4th International Conference on Advanced A/D and D/A Conversion Techniques and their Applications (together with 7th IMEKO TC4 Workshop on ADC Modelling and Testing)
- Place:
- Prague, CZECH REPUBLIC
- Time:
- 26 June 2002 - 28 June 2002