METHOD OF BITRATE CONTROL AND ADJUSTMENT FOR AUDIO CODING
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United States of America Patent
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Issued Date -
Feb 8, 2007
app pub date -
Jul 18, 2006
filing date -
Aug 3, 2005
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Abandoned
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Abstract
This invention discloses a method of bit-rate control and adjustment for audio coding, which comprises following steps: obtain the spectrum of the current audio frame and compute the maximum absolute value of each Bark (Bark: in the unit of critical band) frequency band; calculate the initial value of the minimum scale factor threshold and set the scale factor for each Bark band; Scale the spectrum of each audio frame with different scale factor, encode the quantized spectrum and calculate the coded bit of the current frame; Determine whether or not the coded bits of current frame is within the expected range of the bits, if yes, the bitstream is formatted and outputted, otherwise the minimum scale factor threshold is adjusted and repeat the above steps until the requirement is met. This method can significantly improve the encoding speed and reduce the coding loss of audio.
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