Hybrid encoding of multichannel audio

A multi-channel and encoding technology, applied in the field of multi-channel audio encoding and decoding, can solve problems such as sacrificing audio bandwidth and multi-encoding artifacts

Active Publication Date: 2015-12-16
DOLBY LAB LICENSING CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, while this solution preserves as much space as possible, it introduces more encoding artifacts and sacrifices audio bandwidth

Method used

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  • Hybrid encoding of multichannel audio
  • Hybrid encoding of multichannel audio
  • Hybrid encoding of multichannel audio

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Embodiment Construction

[0042] will refer to figure 2 Embodiments of the encoding method of the present invention and a system configured to perform the method are described. figure 2 The system is an E-AC-3 encoder configured to generate an E-AC-3 encoded audio bitstream (31) in response to a multi-channel audio input signal (21). Signal 21 may be a "5.0 channel" time domain signal comprising five full range channels of audio content.

[0043] figure 2 The system is also configured to generate an E-AC-3 encoded audio bitstream 31 in response to a 5.1 channel audio input signal 21 comprising 5 full range channels and 1 low frequency effect (LFE) channel. figure 2 The elements shown in are capable of encoding 5 full-range input channels and providing bits indicative of the encoded full-range channels to the formatting stage 20 for inclusion in the output bitstream 31 . figure 2 Conventional system elements for encoding the LFE channel (in a conventional manner) and providing bits indicative of the ...

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Abstract

A method for encoding a multichannel audio input signal, includes steps of generating a downmix of low frequency components of a subset of channels of the input signal, waveform coding each channel of the downmix, thereby generating waveform coded, downmixed data, performing parametric encoding on at least some higher frequency components of each channel of the input signal, thereby generating parametrically coded data, and generating an encoded audio signal (e.g., an E-AC-3 encoded signal) indicative of the waveform coded, downmixed data and the parametrically coded data. Other aspects are methods for decoding such an encoded signal, and systems configured to perform any embodiment of the inventive method.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 61 / 817729, filed April 30, 2013, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to audio signal processing, and more particularly to multi-channel audio encoding (eg, encoding of data indicative of a multi-channel audio signal) and decoding. In a typical embodiment, a downmix of low frequency components of individual channels of multi-channel input audio is subjected to waveform coding, while other (higher frequency) frequency components of the input audio are subjected to parametric coding . Some embodiments encode multi-channel audio data according to one of the formats known as AC-3 and E-AC-3 (enhanced AC-3) or according to another coding format. Background technique [0004] Dolby Laboratories provides proprietary implementations of AC-3 and E-AC-3 known as Dolby Digital an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008
CPCG10L19/02G10L19/008
Inventor P·威廉姆斯M·舒格R·特辛
Owner DOLBY LAB LICENSING CORP
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