Method for audio and image data compression
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United States of America Patent
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Issued Date -
Jun 1, 2006
app pub date -
Nov 26, 2004
filing date -
Nov 26, 2004
priority date (Note) -
Abandoned
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Abstract
The present invention provides method of image and audio data compression. Filtering and down sampling means are firstly applied to reduce data of samples. The selected data samples are firstly compressed by means of ADPCM. The error between the original and the ADPCM coded data stream are calculated and compared to at least one predetermined value to determine the means of correction. Discrete Cosine Transform is applied to compress error data between the original and the ADPCM coded data stream. The DCT coefficients of error are inserted into the ADPCM data stream for correction.
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