Digitally encoded machine readable storage media using adaptive

Details Digitally encoded machine readable storage media using adaptive Digitally encoded machine readable storage media using adaptive

1998-05-28

1999-11-02

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704230, 704500, 704503, G10L 900

Patent

active

059787627

ABSTRACT:
A subband audio coder employs perfect
on-perfect reconstruction filters, predictive
on-predictive subband encoding, transient analysis, and psycho-acoustic/minimum mean-square-error (mmse) bit allocation over time, frequency and the multiple audio channels to encode/decode a data stream to generate high fidelity reconstructed audio. The audio coder windows the multi-channel audio signal such that the frame size, i.e. number of bytes, is constrained to lie in a desired range, and formats the encoded data so that the individual subframes can be played back as they are received thereby reducing latency. Furthermore, the audio coder processes the baseband portion (0-24 kHz) of the audio bandwidth for sampling frequencies of 48 kHz and higher with the same encoding/decoding algorithm so that audio coder architecture is future compatible.

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