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Method and arrangement for a decoder for multi-channel surround sound

A multi-channel, channel technology, used in instruments, speech analysis, stereo systems, etc., can solve problems such as excessive amplification and channel cancellation, and achieve the effect of improving quality, reducing complexity and reducing complexity

Active Publication Date: 2009-04-15
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] A second disadvantage is the need for temporary memory in order to store intermediate decoded channels
This is not a problem when listening in a loudspeaker environment; however it becomes a problem if the channels are combined, such as in a 3D reproduction, possibly leading to unwanted channel cancellation or over-amplification

Method used

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  • Method and arrangement for a decoder for multi-channel surround sound
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  • Method and arrangement for a decoder for multi-channel surround sound

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Embodiment Construction

[0054]The basic concept of the invention is to obtain a partially known spatial covariance of a multi-channel surround audio signal based on the received spatial parameters and extrapolate the obtained partially known spatial covariance to obtain the complete spatial covariance. Then, according to a fidelity criterion, a predetermined arbitrary linear combination of the multi-channel surround audio signal is estimated based at least on the extrapolated full spatial covariance, the received decoded downmix signal m and the description H of the predetermined arbitrary linear combination, A predetermined linear combination of multi-channel surround audio signals can be synthesized based on said estimates. A predetermined arbitrary linear combination of multi-channel surround audio signals can conceptually represent filtering of multi-channel signals, such as head-related filtering and stereo reproduction. It can also represent other sound effects, such as reverb.

[0055] Accord...

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PUM

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Abstract

The basic concept of the present invention is to extrapolate a partially known spatial covariance matrix of a multi-channel signal in the parameter domain. The extrapolated covariance matrix is used with the downcoded downmix signal in order to efficiently generate an estimate of a linear combination of the multi-channel signals.

Description

technical field [0001] The present invention relates to decoding a multi-channel surround audio bitstream. In particular, the invention relates to a method and apparatus for signal decoding using spatial covariance matrix extrapolation. Background technique [0002] In movie theaters all over the world, multi-channel surround audio systems have long placed the movie audience in the center of the audio space of the movie scene, played in front of the audience and giving the audience a believable "being there" experience. feel. This audio technology has found its way into ordinary people's homes as home surround sound theater systems, and is now offering people the feeling of "being there" in their own living rooms. [0003] The next area where this audio technology will be used includes mobile wireless units or terminals, especially small units such as cellular phones, mp3 players (including similar music players) and PDAs (Personal Digital Assistants). Here, the immersive...

Claims

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Application Information

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IPC IPC(8): H04S3/00H04S5/00G10L19/00
CPCG10L19/008H04S3/02H04S2420/03
Inventor A·塔莱布
Owner TELEFON AB LM ERICSSON (PUBL)
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