Preserving matrix surround information in encoded audio/video system and method

摘要

A method and apparatus for preserving matrix-surround information in encoded audio/video includes a receiver operative to receive matrix-surround encoded audio signals via a modem, separate the audio signals into a frequency spectrum having discrete audio frequencies, and determine a cutoff threshold used to encode the matrix-surround encoded audio signals. The method and apparatus further includes a decoder operative to decode a first set of the audio frequencies below the determined cutoff threshold using a first matrix-surround preserving audio encoding method and to decode a second set of audio frequencies above the cutoff threshold using a second non matrix-surround preserving audio encoding method.

主权项

1. A method of encoding matrix-surround-encoded audio for transmission over a low bitrate connection that is less than about 96 kbps, comprising:
identifying a source audio content comprising matrix-surround-encoded audio; separating said source audio content into a frequency spectrum having a plurality of discrete audio frequencies; determining a frequency cutoff threshold; encoding a first set of the plurality of audio frequencies below said frequency cutoff threshold using a matrix-surround-preserving audio encoding method including dual-mono or mid/side coding; and encoding a second set of the plurality of audio frequencies above said frequency cutoff threshold using a non-matrix-surround-preserving audio encoding method including joint-stereo coding.