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Method and system for encoding a stereo sound signal using coding parameters of a primary channel to encode a secondary channel

A technology of sound signals and coding parameters, applied in stereo systems, two-channel systems, speech analysis, etc., can solve the problems of inability to maintain the limitations of the surrounding environment, disturbing the audience, and difficult to obtain quality.

Active Publication Date: 2018-07-31
VOICEAGE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Transmitting a panning factor may help create a basic stereo effect at low bitrates, but this technique fails to preserve ambient and presents inherent limitations
An adaptation of the translation factor that is too fast becomes disturbing to the listener, while an adaptation of the translation factor that is too slow does not reflect the true position of the speaker, which makes it difficult to adjust the hard to get good quality
Currently, encoding conversational stereo speech with decent quality for all possible audio scenarios requires a minimum bitrate of about 24kb / s for wideband (WB) signals; below this bitrate speech quality starts to suffer

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  • Method and system for encoding a stereo sound signal using coding parameters of a primary channel to encode a secondary channel
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  • Method and system for encoding a stereo sound signal using coding parameters of a primary channel to encode a secondary channel

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Embodiment Construction

[0034]The present disclosure relates to the generation and delivery with low bitrate and low latency of realistic representations of stereophonic sound content, such as speech and / or audio content, from specific but not exclusively complex audio scenes. Complex audio scenarios include situations where (a) there is low correlation between sound signals recorded by microphones, (b) there are significant fluctuations in background noise, and / or (c) interfering speakers are present. Examples of complex audio scenarios include large anechoic conference rooms with A / B microphone configurations, small echo chambers with binaural microphones, and small echo chambers with mono / side microphone setups. All of these room configurations can include fluctuating background noise and / or interfering speakers.

[0035] Known stereo sound codecs such as 3GPP AMR-WB+ described in reference [7] (the entire content of which is hereby incorporated by reference) are poor for encoding sound that does ...

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Abstract

A stereo sound encoding method and system for encoding left and right channels of a stereo sound signal, down mix the left and right channels of the stereo sound signal to produce primary and secondary channels, encode the primary channel, and encode the secondary channel. Encoding the secondary channel comprises analyzing coherence between coding parameters calculated during the secondary channelencoding and coding parameters calculated during the primary channel encoding to decide if the coding parameters calculated during the primary channel encoding are sufficiently close to the coding parameters calculated during the secondary channel encoding to be re-used during the secondary channel encoding.

Description

technical field [0001] The present disclosure relates to stereo sound coding, in particular but not exclusively to stereo speech and / or audio coding capable of producing good stereo quality in complex audio scenes at low bit rates and low delays. Background technique [0002] Historically, conversational telephony has been implemented with telephone handsets that have only one transducer to output sound to only one ear of the user. In the last decade or so, users have begun to use their portable telephone handsets in combination with headsets to receive sound over their ears, primarily to listen to music, and sometimes to speech. However, when the handset of the portable telephone is used to transmit and receive conversational speech, the content is still monophonic, but when a headset is used the content is presented to both ears of the user. [0003] With the latest 3GPP speech coding standards described in reference [1] (the entire content of which is hereby incorporated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008G10L19/125G10L19/26
CPCG10L19/008G10L19/12G10L19/26G10L19/06G10L19/24G10L25/51G10L25/03G10L19/002G10L19/09G10L25/06H04S1/00H04S1/007G10L19/032H04S2400/03G10L25/21H04S2400/01
Inventor T.瓦尔兰科特M.杰利内克
Owner VOICEAGE CORP