Multi-channel predictive subband audio coder using psychoacousti

Details Multi-channel predictive subband audio coder using psychoacousti Multi-channel predictive subband audio coder using psychoacousti

1996-05-02

1999-09-21

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704500, 704503, G10L 302

Patent

active

059566744

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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