Audio matrix encoding

Details Audio matrix encoding Audio matrix encoding

1997-02-21

1999-01-19

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Pseudo stereophonic

381 61, H04R 500

Patent

active

058622284

ABSTRACT:
A surround sound encoder, intended for implementation in software, runs in real time on a personal computer using low mips and a small fraction of available CPU cycles. In the principal application for the encoder, the Lt and Rt signals of the encoder are mixed with the Lt and Rt signals of a pre-recorded source (e.g., computer game soundtrack, CD ROM, Internet audio, etc.). Alternatively, the encoder may be used by itself or with one or more other virtual encoders to provide a totally user-generated soundfield. The encoder is implemented in either of two ways: the signal being encoded may be panned to one or more of the four inputs of a surround-sound fixed matrix encoder or the signal may be encoded by applying the signal to a surround-sound variable-matrix encoder. Phase shifting, required in the encoder, is achieved by applying a signal to two phase-shifting processes, producing two signals whose relative phase difference is sufficiently close to the desired phase shift over at least a substantial part of the frequency band of interest. Satisfactory audible results may be achieved, using very low computer processing power, when one of the phase shifting processes is implemented by a first-order all-pass filter and the other phase shifting process is implemented by only a short time delay, which also has an all-pass characteristic.

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