CN102844808A - Parametric encoder for encoding multi-channel audio signal - Google Patents
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Abstract
A parametric encoder for encoding a multi-channel audio signal having a first audio signal and a second audio signal is provided. The parametric encoder has a transformer (101) for transforming the first audio signal into frequency domain to obtain a first transformed audio signal and for transforming the second audio signal into frequency domain to obtain a second transformed audio signal, a parameter generator (107) for generating a first encoding parameter from the first transformed audio signal and from the second transformed audio signal at a first frequency and for generating a second encoding parameter from the first transformed audio signal and from the second transformed audio signal at a second frequency, and a parameter combiner (109) for combining the first encoding parameter and the second encoding parameter to obtain a combined encoding parameter.
Description
Technical field
The present invention relates to audio coding.
Background technology
For example the C richness is reined in " use perception parametrization come efficient representation space audio frequency (Efficient representation of spatial audio using perceptual parametrization) " of (C.Faller) and F Bao Mujiate (F.Baumgarte) (IEEE is about the symposial proceedings of Appl.of Sig.; Audio and Acoust. proceedings; October calendar year 2001, the 199th to 202 page) described in parameter stereo or multi-channel audio coding usage space clue audio mixing (monophony or stereo usually) sound signal is synthesized multichannel signal.Usually, the audio mixing sound signal generates because of the stack of a plurality of voice-grade channel signals of multi-channel audio signal (for example stereo audio signal).These less passages are through waveform coding, and add the supplementary (that is, spatial cues) relevant with original signal passage relation to through coding voice-grade channel as coding parameter.Demoder uses this supplementary on the basis of the voice-grade channel of waveform coding, regenerating an original number voice-grade channel through decoding.
The basic parameter stereophonic encoder can use interchannel level difference (ILD) as generating the required clue of stereophonic signal from monophony audio mixing sound signal.Complicated scrambler also can use inter-channel coherence (ICC), and it can represent the similarity between the voice-grade channel signal (that is voice-grade channel).In addition, when coding two channel stereo signal (for example) with realize the 3D audio frequency or based on headphone when playing up (surround rendering), inter-channel phase difference (IPD) also can play the effect of reproducing the phase/delay difference between the passage.
The synthetic of ICC clue can be suitable for most of audio frequency and music content; To regenerate environment, stereo reverberation, source width and other perception relevant with spatial impression; As be described in " spatial hearing: the psychophysics (Spatial Hearing:The Psychophysics of Human Sound Localization) of human sound location " (1997, the MIT publishing house in Massachusetts, United States Cambridge city) of J cloth old you special (J.Blauert).Can synthesize through in frequency domain, using decorrelator to implement the coherence; As be described in " to the progress (Advances in parametric coding for high-quality audio) of the parameter coding of high quality audio " (Preprint of E Shu Yuesi (E.Schuijers), W Ou Men (W.Oomen), Deng's B Brinker (B.den Brinker) and J Bu Libaerte (J.Breebaart); The 114th audio frequency engineering association meeting, in March, 2003) in.Yet the known synthetic method that is used for synthetic multi-channel audio signal is suffered from the increase of complicacy.In addition, except that other parameter (for example interchannel level difference (ICLD) and inter-channel phase difference (ICPD)), also use the ICC parameter can increase bit-rate overhead.
Summary of the invention
The target that the present invention will realize is to reduce the complicacy of parameter coding scheme.This target is realized by the characteristic of independent claims.Embodiment can through content is described, graphic and dependent claims can be illustrated.
The present invention is based on parameter coding parameters such as finding to make up ICC parameter for example can reduce the bit rate of representing said parameter required, and therefore can reduce the complicacy of the parameter coding scheme of the following gained.Audio qualitys such as improvement (for example) voice can (for example) will only be applied to a certain frequency range, so that can further reduce complicacy and memory requirement whereby through the coding parameter of combination.
According to first aspect; The present invention relates to a kind of parametric encoder, it is used to encode and has the multi-channel audio signal of first sound signal and second sound signal, and said parametric encoder has: transducer; Be used for first sound signal is transformed to frequency domain; Obtaining the sound signal after first conversion, and be used for second sound signal is transformed to frequency domain, to obtain the sound signal after second conversion; Parameter generators; Be used under first frequency by the sound signal after said first conversion and and second conversion after sound signal generate first coding parameter, and under second frequency by generating second coding parameter in the sound signal after the sound signal after first conversion and second conversion; And the parameter combinations device, be used to make up said first coding parameter and said second coding parameter, to obtain coding parameter through combination.
According to first embodiment of first aspect, first and second coding parameters can be inter-channel phase difference.
According to the 3rd embodiment of first aspect, first and second coding parameters can be inter-channel coherence.
According to the 4th embodiment of first aspect, first and second coding parameters can be inter-channel intensity difference.
According to the 5th embodiment of first aspect, first and second coding parameters can be the interchannel level difference.
According to the 6th embodiment of first aspect, parameter generators is used for generating first coding parameter and second coding parameter based on the multiplying each other of value of the sound signal after the sound signal after first conversion and second conversion.
According to the 7th embodiment of first aspect, the parameter combinations device is used for first coding parameter and the second coding parameter addition, to obtain the coding parameter through combination.
According to the 8th embodiment of first aspect, the parameter combinations device is used for confirming the mean value of first coding parameter and second coding parameter, to obtain the coding parameter through combination.
The 9th embodiment according to first aspect; The power that the parameter combinations device is used for sound signal and the signal after second conversion after using first conversion under a certain frequency is confirmed the weighted mean value of first coding parameter and second coding parameter as weight, to obtain the coding parameter that warp makes up.
According to the tenth embodiment of first aspect, the parameter combinations device is used for the weighted mean value that the frequency of utilization associated weight is confirmed first coding parameter and second coding parameter, to obtain the coding parameter through combination.
The 11 embodiment according to first aspect; Parameter generators is used for generating a plurality of coding parameters by the sound signal after the sound signal after first conversion and second conversion under a plurality of frequencies, and wherein the parameter combinations device is used to make up said a plurality of coding parameter to obtain the coding parameter through combination.
According to the 12 embodiment of first aspect, parametric encoder further comprises signal combiner, is used to make up sound signal and the sound signal after second conversion after first conversion to obtain audio signal.
According to the 13 embodiment of first aspect, parametric encoder further comprises inverse transformer, and the combination that is used for sound signal and the sound signal after second conversion after inverse transformation first conversion is to obtain the audio mixing sound signal.
According to second aspect; The present invention relates to a kind of parameter decoder, it is used for based on coding parameter and the audio mixing sound signal of decoding through combination, and said audio mixing sound signal is represented the combination of first sound signal and second sound signal; Said coding parameter through combination is represented frequency specific coding combinations of parameters; Said parameter decoder has: transducer is used for conversion audio mixing sound signal, with the audio mixing sound signal after the conversion that obtains to have a certain frequency; Device is provided, is used for based on the frequency specific coding parameter that joins with said a certain frequency dependence being provided through the coding parameter of combination; And the audio frequency compositor, be used in synthetic first sound signal of audio mixing sound signal after the conversion and frequency specific coding parameter under the said a certain frequency and second sound signal.
For instance, the said parameter decoder audio mixing sound signal that can be used for decoding, said audio mixing sound signal can be provided by the parametric encoder based on first aspect.
According to first embodiment of second aspect, provide device to be suitable for providing coding parameter through combination as frequency specific coding parameter.
According to second embodiment of second aspect, parameter decoder further comprises inverse transformer, is used for inverse transformation first sound signal and second sound signal.
According to the third aspect; The present invention relates to a kind of method that is used for having the multi-channel audio signal of first sound signal and second sound signal with parameter mode coding; Said method comprises: first sound signal is transformed in the frequency domain; Obtaining the sound signal after first conversion, and second sound signal is transformed in the frequency domain, to obtain the sound signal after second conversion; Under first frequency, generate first coding parameter by the sound signal after the sound signal after first conversion and second conversion, and under second frequency by generating second coding parameter in the sound signal after the sound signal after first conversion and second conversion; And make up first coding parameter and second coding parameter, to obtain coding parameter through combination.
Can be directly from function, derive according to the other method step of the embodiment of the third aspect based on the parametric encoder of first aspect.
According to fourth aspect; The present invention relates to a kind of being used for based on through the coding parameter of combination and with the method for parameter mode decoding audio mixing sound signal; Said audio mixing sound signal is represented the combination of first sound signal and second sound signal; Said coding parameter through combination is represented frequency specific coding combinations of parameters, and said method comprises: conversion audio mixing sound signal, with the audio mixing sound signal after the conversion that obtains to have a certain frequency; Based on the frequency specific coding parameter that joins with said a certain frequency dependence being provided through the coding parameter of combination; And under said a certain frequency synthetic first sound signal and second sound signal the audio mixing sound signal after conversion and the frequency specific coding parameter.
Can be directly from function, derive according to the other method step of the embodiment of fourth aspect based on the parameter decoder of second aspect.
Description of drawings
Will be referring to following graphic description additional embodiments of the present invention, wherein:
Fig. 1 shows the block diagram according to the parametric encoder of an embodiment;
Fig. 2 shows the block diagram according to the parameter decoder of an embodiment;
Fig. 3 shows the figure according to the parameter coding method of an embodiment; And
Fig. 4 shows the figure according to the parametric solution code method of an embodiment.
Embodiment
Fig. 1 shows the figure according to the parametric encoder of the multi-channel audio signal with the first sound signal x1 and second sound signal x2 of being used to encode of an embodiment.Said parametric encoder comprises: transducer 101, be used for first sound signal is transformed to frequency domain, and obtaining the sound signal after first conversion, and be used for second sound signal is transformed to frequency domain, to obtain the sound signal after second conversion.Transducer 101 can comprise: first transducer 103 is used for conversion first sound signal; And second transducer 105, be used for conversion second sound signal.Transducer 101 and/or transducer 103,105 can be (for example) Fourier transformer.Sound signal after first and second conversion is offered parameter generators 107, be used for that (for example, under the i frequency or in the i frequency band) generates first coding parameter by the sound signal after the signal after first conversion and second conversion under first frequency.I frequency band or " frequency band i " (also seeing Fig. 1) refer to parameter generators 107 and are generated the frequency band i of respective coding parameter down or wherein by the signal after first and second conversion at it, and are also referred to as parameter band i.Parameter generators 107 is further used under second frequency or in second frequency band, generating second coding parameter by the sound signal after first and second conversion.First and second coding parameters are offered parameter combinations device 109, and parameter combinations device 109 makes up first coding parameter and second coding parameter according to principle described herein, to obtain the coding parameter through combination.Yet parameter combinations device 109 can obtain coding parameter individually to the different parameters frequency band.
Referring to Fig. 1, and the ICC parameter of the embodiment of formation coding parameter, (for example) stereo input voice-grade channel x1 and x2 are converted into a plurality of sub-bands or parameter band.In the subclass of all parameter band or parameter band, can estimate corresponding ICC parameter.Can with one or more ICC parameter combinations processes (for example according to equality (1) in the process of (4) one) be applied to the ICC parameter of all parameter band or parameter band subclass, to calculate through combined I CC parameter.Can at least one be put into bit stream 111 through combined I CC parameter, or it is transmitted into audio decoder (showing among Fig. 1).
With respect to the ICC of the embodiment that forms coding parameter following examples are described exemplarily.Yet; Should be understood that coding parameter can be any coding parameter, or have any coding parameter type that is used for parameter coding; For example inter-channel phase difference or inter-channel intensity difference or interchannel level difference etc.; And will understand, scrambler can be suitable for according to one in the coding parameter type noted earlier, some or all generates coding parameter through combination, and be suitable for being included in the bit stream 111 as supplementary through the dissimilar coding parameter that makes up.
The parametric encoder of Fig. 1 can form the parameter stereo coding device, and it estimates aware space clue parameter, for example ICLD, ICPD and/or ICC in parameter band.If the parameter band index is i, estimated parameters is expressed as ICLD (i), ICPD (i) and ICC (i) in said frequency band so.Left side in the parameter band and right-side signal power are expressed as P1 (i) and P2 (i) respectively.
In this regard, can calculate one or more through combined I CC parameter, (for example) is as mean value
Wherein I is to use ICC to calculate the index set through the parameter band of combined I CC parameter, and NI is the index number among the set I.
Calculating is to use weighted mean value through the other type of combined I CC parameter, promptly
P wherein
1(i) signal power of the first voice-grade channel signal in the expression i frequency band, and P wherein
2(i) signal power of the second voice-grade channel signal in the expression i frequency band.
In addition, when calculating through combined I CC, can be by different way to different parameters frequency band (frequency) weighting:
G wherein
iFor giving the weight of frequency (parameter band) i.
Another instance is to use the mean value of only considering frequency weighting and not considering power weightings: in addition, when calculating through combined I CC, can be by different way to different parameters frequency band (frequency) weighting:
Single full range band ICC carries out very goodly.In the case, use all parameter band to calculate through combined I CC, promptly I contains all parameter band index.
According to some embodiments, can improve voice quality through only in limited frequency range, using ICC.In the time only will being used to generate the ICC parameter between the parameter band between 500Hz and the 1.5kHz, less culture noise appears.In the case, only use the parameter band between 500Hz and 1.5kHz to calculate through combined I CC, promptly I only contains those index.
According to some embodiments, the parametric encoder shown in Fig. 1 can estimate that one or more are through combined I CC parameter through following operation:
(a) will be from the ICC parameter combinations of a plurality of parameter band through combined I CC parameter,
(b) will put into bit stream through combined I CC parameter, and
(c) export said bit stream.
Fig. 2 shows and to be used to decode the block diagram of parametric encoder of audio mixing sound signal according to an embodiment.Audio signal can be provided by (for example) parametric encoder shown in Figure 1.Parameter decoder comprises transducer 201, is used for conversion audio mixing sound signal, with after the conversion that obtains to have a certain frequency (i frequencies in for example a plurality of frequencies) or a certain accordingly frequency band (i frequency bands in for example a plurality of frequency bands) the audio mixing sound signal.Parameter decoder further comprises provides device 203, is used to provide the frequency specific coding parameter that joins with said a certain frequency dependence.Frequency specific coding parameter can derive from the coding parameter through combination.Yet frequency specific coding parameter can be corresponding to the coding parameter through combination.Parameter decoder further comprises audio frequency compositor 205 (for example stereo synthesizer); Be used under a certain frequency or at a certain frequency band; Use as by the frequency specific coding parameter that provides device 203 to provide synthetic first sound signal of audio mixing sound signal and second sound signal after the conversion that provides by transducer 201.
According to some embodiments, transducer 201 can be Fourier transformer, and its sound intermediate frequency compositor can synthesize first and second sound signal in frequency domain.Therefore, the output signal that provided of compositor 205 can be corresponding to the first and second voice-grade channel signals.Yet according to some embodiments, parametric encoder can further comprise inverse transformer 207, and it is used at the time domain inverse transformation first and second voice-grade channel signals, in time domain, to obtain the first voice-grade channel signal x2 and the second voice-grade channel signal x2.
Parameter decoder shown in Fig. 1 is used for all parameter band, or its subclass J, through combined I CC parameter or it is through revision.Can use the parameter band subclass (be J=I) identical at the demoder place with the scrambler place, or different subclass.
With regard to Fig. 2, parameter decoder can receive audio signal and stereo parameter (being coding parameter), wherein can receive at least one through combined I CC parameter.For at least one parameter band, use the ICC parameter that derives from through combined I CC parameter.For some frequency bands, Application of I CC is not synthetic.
According to an embodiment,,, will be applied to all parameter band through combined I CC when using one during through combined I CC for " through combined I CC to frequency band ICC conversion ".Perhaps, if only to frequency band subclass J estimation through combined I CC, demoder can be with being applied to all frequency bands through combined I CC, being applied to same subclass so, or be applied to another subclass, for example the subclass of same subclass.
If use two two different frequency scopes representing sound signal through combined I CC.Demoder can be with being applied to through combined I CC and said frequency range corresponding parameters frequency band, and said is estimating by described frequency range through combined I CC.
Fig. 3 shows the figure be used for the method for the parameter mode coding multi-channel audio signal with first and second sound signals as mentioned above.Said method comprises: with the first and second sound signal conversion (301) in frequency domain, to obtain the sound signal after first and second conversion; Under first frequency, generate (303) first coding parameters, and under second frequency, generate (303) second coding parameters by the sound signal after first and second conversion by the sound signal after first and second conversion; And combination (305) first and second coding parameter is to obtain the coding parameter through combination.For instance, method depicted in figure 3 can be carried out by parametric encoder as shown in Figure 1.
Fig. 4 shows and to be used for based on through the coding parameter of the combination block diagram with the method for parameter mode decoding audio mixing sound signal.The audio mixing sound signal can be represented the combination (for example stack) of first and second sound signal.Coding parameter through combination can have like the described characteristic of preceding text.
Said method comprises: the audio mixing sound signal of conversion (401) audio mixing sound signal after with the conversion that obtains to have a certain frequency; According to principle described herein, based on the frequency specific coding parameter that provides (403) and said a certain frequency dependence to join through the coding parameter of combination; And under said a certain frequency, synthesize (405) first and second sound signals by audio mixing sound signal after the conversion and frequency specific coding parameter.
According to some embodiments, method depicted in figure 4 can be carried out by parameter decoder as shown in Figure 2.
According to some embodiments, parameter decoder shown in Figure 2 can be the parameter stereo demoder that is suitable for carrying out following operation
(a) receive one or more through combined I CC parameter, and
(b) use and the ICC parameter that receives at least one parameter band through combination ICC relating to parameters.
Claims (15)
1. the parametric encoder of the multi-channel audio signal with first sound signal and second sound signal of being used to encode is characterized in that said parametric encoder comprises:
Transducer (101) is used for said first sound signal is transformed to frequency domain, obtaining the sound signal after first conversion, and is used for said second sound signal is transformed to frequency domain, to obtain the sound signal after second conversion;
Parameter generators (107); Be used under first frequency, generating first coding parameter, and be used under second frequency by generating second coding parameter by the sound signal after sound signal after said first conversion and said second conversion by the sound signal after sound signal after said first conversion and said second conversion; And
Parameter combinations device (109) is used to make up said first coding parameter and said second coding parameter to obtain the coding parameter through combination.
2. parametric encoder according to claim 1 is characterized in that, said first coding parameter and said second coding parameter are inter-channel phase difference or inter-channel coherence or inter-channel intensity difference or interchannel level difference.
3. parametric encoder according to claim 1 and 2; It is characterized in that said parameter generators (107) is used for generating said first coding parameter and said second coding parameter based on the multiplying each other of value of the sound signal after sound signal after said first conversion and said second conversion.
4. according to the described parametric encoder of arbitrary claim in the aforementioned claim, it is characterized in that said parameter combinations device (109) is used for said first coding parameter and the said second coding parameter addition, to obtain said coding parameter through combination.
5. according to the described parametric encoder of arbitrary claim in the aforementioned claim, it is characterized in that said parameter combinations device (109) is used for confirming the mean value of said first coding parameter and said second coding parameter, to obtain said coding parameter through combination.
6. according to the described parametric encoder of arbitrary claim in the aforementioned claim; It is characterized in that; The power that said parameter combinations device (109) is used for sound signal and the signal after said second conversion after using said first conversion under a certain frequency is confirmed the weighted mean value of said first coding parameter and said second coding parameter as weight, to obtain the coding parameter that said warp makes up.
7. according to the described parametric encoder of arbitrary claim in the aforementioned claim; It is characterized in that; Said parameter combinations device (109) is used for the weighted mean value that the frequency of utilization associated weight is confirmed said first coding parameter and said second coding parameter, to obtain said coding parameter through combination.
8. according to the described parametric encoder of arbitrary claim in the aforementioned claim; It is characterized in that; Said parameter generators (107) is used for generating a plurality of coding parameters by the sound signal after sound signal after said first conversion and said second conversion under a plurality of frequencies; And said parameter combinations device is used to make up said a plurality of said coding parameter, to obtain said coding parameter through combination.
9. according to the described parametric encoder of arbitrary claim in the aforementioned claim, it is characterized in that described parametric encoder is further used for making up sound signal and the sound signal after said second conversion after said first conversion, to obtain audio signal.
10. according to the described parametric encoder of arbitrary claim in the aforementioned claim, it further comprises inverse transformer, and the combination that is used for sound signal and the sound signal after said second conversion after said first conversion of inverse transformation is to obtain the audio mixing sound signal.
11. one kind is used for based on coding parameter and the parameter decoder of the audio mixing sound signal of decoding through combination; Said audio mixing sound signal is represented the combination of first sound signal and second sound signal; Said coding parameter through combination is represented frequency specific coding combinations of parameters; It is characterized in that said parameter decoder has:
Transducer (201) is used for the audio mixing sound signal of the said audio mixing sound signal of conversion after with the conversion that obtains to have a certain frequency;
Device (203) is provided, be used for based on said through combination coding parameter and the frequency specific coding parameter that joins with said a certain frequency dependence is provided; And
Audio frequency compositor (205) is used under said a certain frequency by the audio mixing sound signal after the said conversion and synthetic said first sound signal of said frequency specific coding parameter and said second sound signal.
12. parameter decoder according to claim 11 is characterized in that, the said device (203) that provides is used to provide said coding parameter through combination, as said frequency specific coding parameter.
13., it is characterized in that it further comprises inverse transformer (207) according to claim 11 or 12 described parameter decoder, be used for said first sound signal of inverse transformation and said second sound signal.
14. one kind is used for having the method for the multi-channel audio signal of first sound signal and second sound signal with the parameter mode coding, it is characterized in that said method comprises:
The said first sound signal conversion (301) in frequency domain, obtaining the sound signal after first conversion, and is transformed to said second sound signal in the frequency domain, to obtain the sound signal after second conversion;
Under first frequency, generate (303) first coding parameters, and under second frequency, generate second coding parameter by the sound signal after sound signal after said first conversion and said second conversion by the sound signal after sound signal after said first conversion and said second conversion; And
Combination (305) said first coding parameter and said second coding parameter are to obtain the coding parameter through combination.
15. one kind is used for based on through the coding parameter of combination and with the method for parameter mode decoding audio mixing sound signal; Said audio mixing sound signal is represented the combination of first sound signal and second sound signal; Said coding parameter through combination is represented frequency specific coding combinations of parameters; It is characterized in that said method comprises:
The audio mixing sound signal of the said audio mixing sound signal of conversion (401) after with the conversion that obtains to have a certain frequency;
Based on said coding parameter and frequency specific coding parameter of providing (403) and said a certain frequency dependence to join through combination; And
Under said a certain frequency by after the said conversion synthetic (405) said first sound signal of audio mixing sound signal and said frequency specific coding parameter and said second sound signal.
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| US11393480B2 (en) | 2016-05-31 | 2022-07-19 | Huawei Technologies Co., Ltd. | Inter-channel phase difference parameter extraction method and apparatus |
| CN108475509B (en) * | 2016-05-31 | 2022-10-04 | 华为技术有限公司 | Method and device for extracting phase difference parameters between sound channels |
| US11915709B2 (en) | 2016-05-31 | 2024-02-27 | Huawei Technologies Co., Ltd. | Inter-channel phase difference parameter extraction method and apparatus |
| CN112970062A (en) * | 2018-08-31 | 2021-06-15 | 诺基亚技术有限公司 | Spatial parameter signaling |
| CN110740404A (en) * | 2019-09-27 | 2020-01-31 | 广州励丰文化科技股份有限公司 | audio correlation processing method and audio processing device |
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| EP2633520A4 (en) | 2013-09-04 |
| CN102844808B (en) | 2016-01-13 |
| EP2633520B1 (en) | 2015-09-02 |
| ES2553398T3 (en) | 2015-12-09 |
| EP2633520A1 (en) | 2013-09-04 |
| WO2012058805A1 (en) | 2012-05-10 |
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