Audio encoding apparatus which splits a signal, allocates and tr

Details Audio encoding apparatus which splits a signal, allocates and tr Audio encoding apparatus which splits a signal, allocates and tr

1998-06-15

2000-08-01

Zele, Krista

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704500, 704501, G10L 2100

Patent

active

060980397

ABSTRACT:
Disclosed is an audio encoding apparatus for splitting an audio signal into a plurality of bands, allocating a number of quantization bits to each band and transmitting the audio signal of each band upon quantizing the audio signal by the number of allocated bits. The apparatus includes a bit allocation unit for (1) calculating an MNR for each band, where MNR is the ratio of an audio masking level M to a quantization noise level N, (2) comparing a set MNR with the smallest MNR from among the MNRs of the respective bands, (3) incrementing the number of quantization bits of the band that corresponds to the smallest MNR if the smallest MNR is smaller than the set MNR, and (4) performing allocation control for allocating quantization bits to each band until the smallest MNR becomes equal to or greater than the set MNR. A quantizer quantizes the audio signal of each band by the allocated number of quantization bits, and a bit-rate calculation unit decides a bit rate for transmission of audio data based upon the number of quantization bits allocated to each band.

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Internation Standard ISO/IEC 11172-3, pp. 20-32, pp. 70-75, Aug. 1, 1993.
Digital Signal Processing Handbook, Madisetti et al, chapter 40, pp. 1-9, 1998.

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