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Efficient implementation of phase shift filtering for decorrelation and other applications in an audio coding system

A technology of audio signal and audio information, applied in the field of signal processing, which can solve problems such as poor decorrelation and the need for a considerable amount of computing resources

Inactive Publication Date: 2013-05-22
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simplified implementations such as those based on complementary infinite impulse response filters or those based on combinations of filters and delays are also possible, but these approaches generally introduce non-linearities which lead to poor Frequency response or poor decorrelation and can require considerable computational resources

Method used

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  • Efficient implementation of phase shift filtering for decorrelation and other applications in an audio coding system
  • Efficient implementation of phase shift filtering for decorrelation and other applications in an audio coding system
  • Efficient implementation of phase shift filtering for decorrelation and other applications in an audio coding system

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Embodiment Construction

[0030] A. overview

[0031] figure 1 An exemplary transmitter in an audio coding system suitable for incorporating aspects of the invention is shown. In this transmitter, an analysis filter bank 11 is applied to the first source audio signal received from path 1 to generate first audio information representative of the spectral content of the first source audio signal. An encoder 20 is applied to the first audio information to generate first encoded information. Formatter 30 assembles the first encoded information into the output signal passed along path 4 .

[0032] In a two-channel application, the transmitter applies the analysis filterbank 12 to the second source audio signal received from path 2 to generate second audio information representative of the spectral content of the second source audio signal. The encoder 20 is applied to the second audio information to generate second encoded information. Formatter 30 assembles the second encoded information into the outp...

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Abstract

An analysis / synthesis system uses existing analysis and synthesis filterbanks in an audio coding system to implement a phase shift filter that requires very little if any additional processing. One implementation using a single processing path can obtain a phase shift of either zero or ninety degrees. Another implementation that uses two processing paths can obtain a phase shift of essentially any desired angle.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 61 / 385,487, filed September 22, 2010, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to signal processing methods that can be used in audio coding systems, and more particularly to processing methods that can be used to efficiently implement phase shifting filters. Background technique [0004] Various audio coding system standards exist that are capable of presenting five or more channels of sound in a playback environment. Some examples are included in "Digital Audio Compression Standard (AC-3, E-AC-3)" Revision B, Document A / 52B, June 14, 2005, published by the Advanced Television Systems Committee (herein referred to as "ATSC Standard "), and in ISO / IEC 13818-7, Advanced Audio Coding (AAC) (herein referred to as the "MPEG-2 AAC standard") and ISO / IEC 14496-3, Subpar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/008G10L19/00
CPCG10L19/008G10L19/0212H04S2400/03H04S3/008
Inventor 斯蒂芬·D·弗农
Owner DOLBY LAB LICENSING CORP