Perceptual coding of audio signals

Details Perceptual coding of audio signals Perceptual coding of audio signals

G - Physics

10

K

354/50

G10K 15/00 (2006.01) H03M 7/42 (2006.01) H04B 1/66 (2006.01) H04S 1/00 (2006.01)

Patent

CA 2002015

A technique for the masking of quantizing noise in the coding of audio signals is adapted to include geometric interpolation between the thresholds for a tone masking noise and for noise masking a tone, in order to reduce use of bit-rate capability where it is not necessary for transparent or high quality. The technique is usable with the types of channel coding known as "noiseless" or Huffman coding and with variable radix packing. The stereophonic embodiment eliminates redundanciesin the sum and difference signals, so that the stereo coding uses significantly less than twice the bit rate of the comparable monaural signal. The technique can be used both in transmission of signals and in recording for reproduction, particularly recording and reproduction of music. Compatibility with the ISDN transmission rates known as 1B, 2B and 3B rates has been achieved.

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