CN101253552A - Method for decoding an audio signal - Google Patents
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Abstract
The invention relates to a method for decoding an audio signal, to allow an audio signal to be compressed and transfered more efficiently. The inventive method comprises steps of receiving an audio signal with spatial information signal, obtainning location information using the number of time slot and parameter of audio signal, establishing a multi-channel audio signal by applying spatial information signal to down-mix signal, and performing a multi-channel array for a multi-channel audio signal in response to the output channel.
Description
[technical field]
The present invention relates to Audio Signal Processing, relate in particular to the devices and methods therefor that is used for decoded audio signal.
[background technology]
Generally speaking, in the situation of sound signal, audio signal encoding apparatus becomes the down-mix audio signal of monophony or stereo type with audio signal compression, rather than compresses each multi-channel audio signal.Audio signal encoding apparatus is sent to decoding device with compressed down-mix audio signal with spatial signal information, or compressed down-mix audio signal and spatial signal information are stored in the storage medium.In this case, the spatial signal information of extracting when multi-channel audio signal is carried out multi-channel audio is used when recovering original multi-channel audio signal from down-mix audio signal.
Configuration information generally is unmodifiable, and the head that comprises this information only is inserted in the sound signal once.Because configuration information once sends by being inserted in the sound signal in beginning, thus audio signal decoder the situation of basic point reproducing audio signal from random the time owing to there is not configuration information between decode empty message context problem is arranged.
Audio signal encoding apparatus is generated to down-mix audio signal and spatial signal information in the bit stream together or respectively, transfers them to audio signal decoder then.So if nonessential information etc. are included in the spatial signal information, then signal compression and transmission efficiency will reduce.
[disclosing]
[technical matters]
An object of the present invention is to provide a kind of devices and methods therefor that is used for decoded audio signal, by this can be by spatial signal information optionally being included in the head basic point reproducing audio signal from random the time.
Another object of the present invention provides a kind of devices and methods therefor that is used for decoded audio signal, can use variable number of bits to represent position with the time slot of application parameter collection expeditiously by this.
Another object of the present invention provides a kind of devices and methods therefor that is used for decoded audio signal, can be shown minimum variable number of bits and improves audio signal compression and transmission efficiency by carrying out the down-mix audio signal layout or multichannel being mapped to the required apsi message of loudspeaker by this.
Another purpose of the present invention provides a kind of devices and methods therefor that is used for decoded audio signal, by this can be by multichannel is mapped to loudspeaker reduces the required quantity of information of signal layout with not carrying out the down-mix audio signal layout.
[technical solution]
Above-mentioned purpose of the present invention, feature and advantage will be set forth in the following description, and from then on part will be described and become apparent.The embodiments of the invention that can realize above-mentioned purpose will be set forth with reference to the accompanying drawings.
To carry out detailed reference to a preferred embodiment of the present invention now, its example is shown in the drawings.
Fig. 1 is the arrangement plan that is sent to the sound signal of audio signal decoder from audio signal encoding apparatus according to an embodiment of the invention.
With reference to figure 1, sound signal comprises audio descriptor 101, down-mix audio signal 103 and spatial signal information 105.
In the situation of the sound signal of using encoding scheme to reproduce to be used for broadcasting etc., sound signal can comprise that not only audio descriptor 101 and down-mix audio signal 103 can also comprise auxiliary data.And, the present invention includes spatial signal information 105 as auxiliary data.In order to make audio signal decoder without the essential information of analyzing audio signal with regard to the energy audio coding decoding, sound signal can optionally comprise audio descriptor 101.Audio descriptor 101 is configured to have the essential information of the necessary minority of audio decoder, such as the identifier of the encoding and decoding of the sample frequency of the number of the transmission of audio signals rate that is sent, sound channel, compressed data, the current use of indication etc.
Audio signal decoder can utilize audio descriptor 101 to understand the type of the encoding and decoding that sound signal is done.Particularly, utilize audio descriptor 101, audio signal decoder just can be understood sound signal whether usage space information signal 105 and down-mix audio signal 103 configuration multichannels.Audio descriptor 101 is independent of down-mix audio signal 103 or the location, spatial signal information 105 ground that is included in the sound signal.For example, audio descriptor 101 is positioned in the independent field of indicative audio signal.Do not comprise in down-mix audio signal 103 in the situation of head that audio signal decoder can utilize audio descriptor 101 to come decoded channels reduction audio signal 103.
Down-mix audio signal 103 is the signals that generate from multichannel is carried out multi-channel audio.And down-mix audio signal 103 can the down-mix unit from be included in audio signal encoding apparatus generate or artificial the generation.Down-mix audio signal 103 can be classified into situation that comprises head and the situation that does not comprise head.Comprise in the situation of head that in down-mix audio signal 103 head is included in each frame for unit frame by frame.Do not comprise in the situation of head in down-mix audio signal 103, mention that down-mix audio signal 103 can utilize audio descriptor 101 to decode in as described above.Down-mix audio signal 103 takes to comprise that each frame comprises the form that does not comprise head in the form of head or the frame.And down-mix audio signal 103 is included in the sound signal in an identical manner up to end of text.
The signal arrangement information is meant to be shown in the down-mix audio signal 103 through decoding is reverted to whether sound signal will be by layout so that carries out the channel expansion audio mixing before the multichannel.
Signal conversion unit is illustrated in by down-mix audio signal 103 being carried out TTT (two to the three) frame that the channel expansion audio mixing is transformed into OTT (one to the two) frame of two signals with a down-mix audio signal 103 when generating multichannel or two down-mix audio signal 103 is transformed into three signals.Particularly, OTT or TTT frame are the notion frames that uses when recovering multichannel by in the channel expansion audio mixing unit (not shown) that is included in audio signal decoder.And, be included in the spatial signal information 105 about the type of signal conversion unit and the information of number.
Channel configuration information is the information that indication is included in the configuration of the channel expansion audio mixing unit in the audio signal decoder.Channel configuration information comprises whether the indicative audio signal passes the identifier of signal conversion unit.Audio signal decoder can utilize channel configuration information to understand to be input to the sound signal of channel expansion audio mixing unit whether to pass signal conversion unit.Audio signal decoder uses information, the channel configuration information about signal conversion unit to wait becomes multi-channel audio signal with down-mix audio signal 103 channel expansion audio mixings.Audio signal decoder is included in signal conversion unit information in the spatial information 111, channel configuration information etc. by utilization to carry out the channel expansion audio mixing to down-mix audio signal 103 and generates multichannel.
The loudspeaker map information is meant the information which loudspeaker multi-channel audio signal in the time of will exporting loudspeaker to respectively by the multi-channel audio signal that the channel expansion audio mixing generates will be mapped to that is shown in.The loudspeaker map information that the audio signal decoder utilization is included in the configuration information 109 outputs to corresponding loudspeaker with multi-channel audio signal.
And, not only comprise these parameters in the spatial information 111, also comprise: whether fixing indication apply the position of time slot of parameter set frame identifier, put on the number of the parameter set of a frame, apply the positional information etc. of the time slot of parameter set.
Fig. 2 is the process flow diagram of the method for according to another embodiment of the invention sound signal being decoded.
With reference to figure 2, audio signal decoder receives the spatial signal information 105 (S201) that is transmitted with the bit stream form by audio signal encoding apparatus.Spatial signal information 105 can with the flow point of down-mix audio signal 103 from the form of bit stream transmit, transmit in auxiliary data that maybe can be by being comprised in down-mix audio signal 103 or the growth data.
If head 107 is included in the spatial signal information 105, then audio signal decoder extracts configuration information 109 (S205) in 107 from the head.
Audio signal decoder determines that whether this configuration information is (S207) that extracts in first head 107 included from spatial signal information 105.
If configuration information 109 is to extract from first head that extracts from spacing wave 105 107, audio signal decoder decoding configuration information 109 (S215) and then according to the spatial information 111 of the transmission configuration information 109 after of decoding through the configuration information 109 of decoding.
If the head that extracts from sound signal 107 is not first head that extracts from spatial signal information 105 107, then audio signal decoder determine from the head the configuration information that extracts in 107 109 whether with the configuration information 109 identical (S209) that from first head 107, extracts.
If configuration information 109 is identical with the configuration information 109 that extracts from first head 107, then audio signal decoder uses through the configuration information 109 that extracts from first head 107 of the decoding spatial information 111 of decoding.If the configuration information that is extracted 109 is not identical with the configuration information 109 that extracts from first head 107, then audio signal decoder determines whether mistake (S211) takes place in this sound signal on the transmission path from the audio signal encoding apparatus to the audio signal decoder.
If configuration information 109 is variable, even then configuration information 109 and the configuration information 109 that extracts from first head 107 are not identical mistake to take place.Therefore, audio signal decoder is updated to variable header 107 (S213) with head 107.Audio signal decoder is then to decode from the configuration information 109 that extracts through the head 107 of renewal (S215).
Audio signal decoder is decoded according to the 109 pairs of spatial informations 111 that transmit after configuration information 109 of configuration information through decoding.
If immutable configuration information 109 is not identical with the configuration information 109 that extracts from first head 107, then this means on the audio signal transmission path mistake has taken place.Therefore, audio signal decoder removes the spatial information 111 that is comprised in the spatial signal information 105 of the configuration information 109 that comprises mistake, or corrects the mistake (S217) of spatial information 111.
Fig. 3 is the process flow diagram of the method that sound signal is decoded according to another embodiment of the invention.
With reference to figure 3, audio signal decoder receives the sound signal (S301) that comprises down-mix audio signal 103 and spatial signal information 105 from audio signal encoding apparatus.
Audio signal decoder is separated into spatial signal information 105 with the sound signal that receives and then spatial information 105 that separates and the down-mix audio signal 103 of separating is sent to core codec unit (not shown) and spatial information decoding unit (not shown) respectively with down-mix audio signal 103 (S303).
Audio signal decoder extracts number of time slot and parameter set number from spatial signal information 105.Number of time slot that the audio signal decoder utilization extracts and parameter set number find the time slot position that applies parameter set.According to the order of corresponding parameter set, the position that applies the time slot of corresponding parameter set is represented as variable number of bits.And, by reducing the bit number of position that expression will apply the time slot of corresponding parameter set, representation space information signal 105 expeditiously just.And, will come detailed explanation will apply the position of the time slot of corresponding parameter set with reference to figure 4 and Fig. 5.
In case obtained time slot position, audio signal decoder just comes spatial signal information 105 decode (S305) by the corresponding parameters collection being put on corresponding position.And, audio signal decoder in the core codec unit to down-mix audio signal 103 decode (S305).
Audio signal decoder can be by in statu quo generating multichannel to carrying out the channel expansion audio mixing through the down-mix audio signal 103 of decoding.But audio signal decoder can be before corresponding signal be carried out the channel expansion audio mixing layout through the order (S307) of the down-mix audio signal 103 of decoding.
The audio signal decoder utilization generates multichannel (S309) through the down-mix audio signal 103 and the spatial signal information 105 through decoding of decoding.Audio signal decoder utilizes spatial signal information 105 that down-mix audio signal 103 is generated as multichannel.Mentioned as described above, spatial signal information 105 comprises the signal conversion unit number and is used to represent that down-mix audio signal 103 passes signal conversion unit and still do not pass the channel configuration information that signal conversion unit just is output when making sound channel expansion audio mixing.Audio signal decoder utilizes signal conversion unit number, channel configuration information to wait down-mix audio signal 103 is carried out channel expansion audio mixing (S309).To explain the method for using less bit number to represent channel configuration information and the method that disposes channel configuration information with reference to figure 6 and Fig. 7 after a while.
Audio signal decoder is mapped to the multi-channel audio signal (S311) that loudspeaker is generated with output with multi-channel audio signal by predetermined sequence.In this case, along with the audio signal sequence of mapping increases, the bit number that is used for multi-channel audio signal is mapped to loudspeaker reduces.Particularly, in the situation of numbering to multi-channel audio signal in order, because first sound signal can be mapped to one in whole loudspeakers, so sound signal is mapped to required the containing much information in mapping second or the follow-up required quantity of information of sound signal of loudspeaker.When second or follow-up sound signal when being mapped to one of all the other loudspeakers the loudspeaker before mapped sound signal with before, shine upon required quantity of information and just reduced.Particularly, increase to reduce by audio signal sequence and shine upon the required quantity of information of sound signal, just representation space information signal 105 expeditiously along with mapping.This method also is applicable to the situation of layout down-mix audio signal 103 in step S307.
Fig. 4 is the sentence structure of the positional information of the time slot that applies parameter set according to an embodiment of the invention.
With reference to figure 4, this sentence structure relate to expression about the information of parameter set number and about the information of the time slot that applies parameter set ' FramingInfo ' 401.
The frame that 403 indications of ' bsFramingType ' field are included in the spatial signal information 105 is anchor-frame or variable frame.Anchor-frame is illustrated in the predefined frame of the time slot position that wherein will apply parameter set.Particularly, the position that applies the time slot of parameter set is decided according to preset rules.Variable frame is illustrated in the frame that the time slot position that wherein will apply parameter set is not set as yet.So variable frame also needs time slot position information could represent to apply the position of the time slot of parameter set.In the following description, will be ' bsFramingType ' 403 called afters indication frame anchor-frame or variable frame ' frame identifier '.
In the situation of variable frame, ' bsParamSlot ' field 407 or 411 indications will apply the positional information of the time slot of parameter set.' bsParamSlot[0] ' field 407 indication will apply the position of the time slot of first parameter set, and ' bsParamSlot[ps] ' field 411 indications will apply second or the position of the time slot of subsequent parameter collection.The position that applies the time slot of first parameter set is represented as initial value, and will apply second or the position of the time slot of subsequent parameter collection be represented as difference ' bsDiffParamSlot[ps] ' 409, promptly ' bsParamSlot[ps] ' with ' bsParamSlot[ps-1] ' poor.In this case, ' ps ' meaning is a parameter set.First parameter set is expressed as ' ps=0 '.And ' ps ' can represent from 0 to less than the value the scope of the value of parameter set sum.
(i) will apply the time slot position 407 or 409 of parameter set along with the ps value increases and increases (bsParamSlot[ps]＞bsParamSlot[ps-1]).(ii), the maximal value that applies the time slot position of first parameter set is added 1 resulting value corresponding to the difference with number of time slot and parameter set number, and time slot position is expressed as ' quantity of information of nBitsParamSlot (0) ' 413 for first parameter set.(iii) for second or the subsequent parameter collection, the time slot position that the time slot position ratio that applies the N parameter set will be applied (N-1) parameter set is big at least by 1, and even can have the value that number of time slot is subtracted the parameter set number income value value of adding N and obtain.With apply second or the time slot position ' bsParamSlot[ps of subsequent parameter collection] ' be represented as difference ' bsDiffParamSlot[ps] ' 409.And this value is represented as ' nBitsParamSlot[ps] ' quantity of information.So, can utilize (i) to (iii) finding and will apply the time slot position of parameter set.
For example, if there are ten time slots to be included in the air-frame, and if three parameter sets are arranged, the time slot position that then will apply first parameter set (ps=0) is adapted to always and the time slot sum is subtracted parameter sum income value adds 1 time slot position that obtains.Particularly, Dui Ying position is suitable for and belongs to 1 to the time slot of the scope between the maximal value 8 one.Time slot position by considering to apply parameter set number increases according to parameter set, and just can understand the time slot position maximum that can apply remaining two parameter set is respectively 9 and 10.So, need three bits to indicate 1 to 8 the time slot position 407 that applies first parameter set, it can be represented as ceil{log
2(k-i+1) }.In this case, ' k ' is a number of time slot, and ' i ' is a number of parameters.
If will apply the time slot position 407 of first parameter set is ' 5 ', then will apply the time slot position ' bsParamSlot[1 of second parameter set] ' should from ' 5+1=6 ' and ' select the value between the 10-3+2=9 '.Particularly, the time slot position that applies second parameter set can be represented as add difference ' bsDiffParamSlot[ps with applying the value that the first parameter set time slot position adds 1 gained] ' 409 values that obtain.So difference 406 can be corresponding to 0 to 3, it can be represented as 2 bits.For second or the subsequent parameter collection,, just can reduce bit number by the time slot position that will apply parameter set being expressed as difference 409 rather than direct representation time slot position.In the example in front, in the situation of direct representation time slot position, needs 4 bits are represented in 6 to 9.But time slot position is expressed as difference only needs 2 bits.
Therefore, indication will apply the time slot of parameter set amount ' nBitsParamSlot (0) ' or ' nBitsParamSlot (ps) ' 413 or 415 positional information not only can be expressed as fixed number of bits and also can be expressed as variable number of bits.
Fig. 5 be according to another embodiment of the invention pass through parameter set is put on the decode process flow diagram of method of spatial signal information of time slot.
With reference to figure 5, audio signal decoder receives the sound signal (S501) that comprises down-mix audio signal 103 and spatial signal information 105.
If there is head 107 in the spatial signal information, then extract number of time slot included in the frame (S503) in the configuration information 109 of audio signal decoder from be included in head 107.If head 107 is not included in the spatial signal information 105, then extract number of time slot in the configuration information 109 the head 107 of audio signal decoder extraction before being included in.
Audio signal decoder extracts the number (S505) that will be applied in the parameter set of frame from spatial signal information 105.
The audio signal decoder utilization is included in the position (S507) that fix or variable that identifier in the spatial signal information 105 determines will apply in the frame time slot of parameter set.
If this frame is an anchor-frame, then audio signal decoder comes spatial signal information 105 decode (S513) by according to preset rules parameter set being put on corresponding time slot.
If this frame is variable frame, then audio signal decoder extracts the information (S509) about the time slot position that will apply first parameter set.As mentioned in the above description, can be that difference with number of time slot and parameter set number adds 1 value that obtains with the time slot position maximum that applies first parameter.
The audio signal decoder utilization obtains about applying second or the information (S511) of the time slot position of subsequent parameter collection about the information of the time slot position that will apply first parameter set.If N is equal to or greater than 2 natural number, this true time slot position that will apply parameter set of time slot position big at least 1 that then can utilize the time slot position ratio that will apply the N parameter set will apply (N-1) parameter set is expressed as minimum number bits, and even can have the value that number of time slot is subtracted parameter set number gained and add the value that N obtains.
And audio signal decoder comes spatial signal information 105 decode (S513) by the time slot position that parameter set is put on gained.
Fig. 6 and Fig. 7 are the synoptic diagram of the channel expansion audio mixing unit of audio signal decoder according to an embodiment of the invention.
Audio signal decoder will be separated into down-mix audio signal 103 and spatial signal information 105 from the sound signal that audio signal encoding apparatus receives, and respectively down-mix audio signal 103 and spatial signal information 105 be decoded then.Mentioned as described above, audio signal decoder comes spatial signal information 105 is decoded by parameter being put on time slot.And audio signal decoder uses through the down-mix audio signal 103 of decoding and the spatial signal information 105 through decoding and generates multi-channel audio signal.
If audio signal encoding apparatus is compressed into N input sound channel M sound signal and this M sound signal is sent to audio signal decoder with the form of bit stream, then audio signal decoder recovers and exports an original N sound channel.This configuration is called as the N-M-N structure.In some cases, if audio signal decoder can not recover this N sound channel, do not consider that then spatial signal information 105 ground are output into two stereophonic signals with down-mix audio signal 103.Yet, will no longer be further discussed this situation at this.The fixing structure of the value of N and M will be called as fixedly channel structure therein.The value of M and the N structure that is represented as random value will be called as channel structure at random therein.Such as 5-1-5,5-2-5,7-2-7 etc. fixedly in the situation of channel structure, audio signal encoding apparatus comes transmit audio signals by channel structure is included in the sound signal.Audio signal decoder comes sound signal is decoded by reading channel structure then.
Audio signal decoder adopts and comprises that the channel expansion audio mixing unit of signal conversion unit reverts to the N multichannel with M sound signal.Signal conversion unit is by down-mix audio signal 103 being carried out be used for when the channel expansion audio mixing generates multichannel that a down-mix audio signal 103 is transformed into two signals or two down-mix audio signal 103 being transformed into the notion frame of three signals.
Audio signal decoder can obtain information about the structure of channel expansion audio mixing unit by extracting channel configuration information in the configuration information from be included in spatial signal information 105 109.Mentioned as described above, channel configuration information is the information that indication is included in the configuration of the channel expansion audio mixing unit in the audio signal decoder.Channel configuration information comprises whether the indicative audio signal passes the identifier of signal conversion unit.Particularly, in the situation of in channel expansion audio mixing unit, passing signal conversion unit through the down-mix audio signal of decoding, channel configuration information can be expressed as and cut apart identifier, because the input and output signal number of signal conversion unit can change.And,, channel configuration information can be expressed as and not cut apart identifier, because the input of signal conversion unit is intactly exported in channel expansion audio mixing unit, not passing in the situation of signal conversion unit through the down-mix audio signal of decoding.In the present invention, cut apart identifier will be represented as ' 1 ', and do not cut apart identifier and will be represented as ' 0 '.
Channel configuration information can be represented in two ways, promptly horizontal method and longitudinal method.
In horizontal method, if sound signal is passed signal conversion unit, that is, if channel configuration information be ' 1 ', then indicate via the lower layer signal of signal conversion unit output whether pass another signal conversion unit in proper order by cutting apart or do not cut apart identifier.If channel configuration information is ' 0 ', then indicate with next sound signal on one deck or upper strata whether pass signal conversion unit by cutting apart or do not cut apart identifier.
In longitudinal method, by cutting apart or each identifier of part sequentially indicates in all audio frequency signal on upper strata each whether to pass signal conversion unit, rather than whether indication upper strata one sound signal is passed signal conversion unit and is indicated lower floor's one sound signal whether to pass signal conversion unit then.
For the structure of same channel expansion audio mixing unit, the exemplary channel configuration information that illustrates of Fig. 6 is represented by horizontal method, and the exemplary channel configuration information that illustrates of Fig. 7 is represented by longitudinal method.In Fig. 6 and Fig. 7, signal conversion unit adopts for example OTT frame.
With reference to 6, four sound signal X of figure
1To X
4Enter channel expansion audio mixing unit.X
1Enter first signal conversion unit, be transformed into two signals 601 and 603 then.The signal conversion unit use that is included in the channel expansion audio mixing unit comes the converting audio frequency signal such as spatial parameters such as CLD, ICC.Signal 601 and 603 through the first signal conversion unit conversion enters second converter unit and the 3rd converter unit, thereby as multi-channel audio signal Y
1To Y
4Be output.X
2Enter the 4th signal conversion unit, then as Y
5And Y
6Be output.And, X
3And X
4Not passing signal conversion unit ground is directly exported.
Because X
1Pass first signal conversion unit, thus signal configuration information be represented as cut apart identifier ' 1 '.Because channel configuration information is represented by horizontal method in Fig. 6, if cut apart identifier, then whether pass another signal conversion unit and sequentially be expressed as and cut apart or do not cut apart identifier via two signals 601 and 603 of first signal conversion unit output so channel configuration information is represented as.
If channel configuration information is ' 0 ', then whether pass signal conversion unit and show by cutting apart or do not cut apart identifier list with next sound signal on one deck or upper strata.So, be the signal X on upper strata
2The expression channel configuration information.
The X of the 4th signal conversion unit will be passed
2Be expressed as and cut apart identifier 1.The signal that passes the 4th signal conversion unit is directly output as Y
5And Y
6, thereby be represented as respectively and do not cut apart identifier 0.
The X that does not pass signal conversion unit and directly export
3And X
4Be represented as respectively and do not cut apart identifier 0.
Therefore, channel configuration information is expressed as 110010010000 by horizontal method.In this case, for ease of understanding, channel configuration information is to extract from the configuration of channel expansion audio mixing unit.Yet audio signal decoder can read channel configuration information to obtain the information about the structure of channel expansion audio mixing unit by opposite mode.
With reference to figure 7, be similar to Fig. 6, four sound signal X
1To X
4Enter channel expansion audio mixing unit.Because longitudinal method with channel configuration information from the upper strata to lower floor be expressed as and cut apart or do not cut apart identifier, so represented in proper order as the identifier of the sound signal of the ground floor 701 of the superiors.Particularly, because X
1And X
2Pass the first and the 4th signal conversion unit respectively, so channel configuration information separately is 1.Because X
3And X
4Do not pass signal conversion unit, so channel configuration information separately is 0.So the channel configuration information of ground floor 701 is 1100.In an identical manner, if order expression, then the channel configuration information of the second layer 703 and the 3rd layer 705 is respectively 1100 and 0000.Therefore, the whole channel configuration information of being represented by longitudinal method is 110011000000.
The channel configuration information that reads audio signal decoder disposes channel expansion audio mixing unit then.In order to make audio signal decoder can dispose channel expansion audio mixing unit, the indication channel configuration is to be represented or should be included in the sound signal by the identifier that longitudinal method is represented by horizontal method.Perhaps, channel configuration information is represented by horizontal method substantially.Yet if represent that by longitudinal method channel configuration information is high efficiency, the identifier that audio signal encoding apparatus can make the indication channel configuration be represented by longitudinal method is included in the sound signal.
Audio signal decoder reads the channel configuration information of being represented by horizontal method, just can dispose channel expansion audio mixing unit then.Yet, in channel configuration information is in the situation of being represented by longitudinal method, and audio signal decoder only could dispose channel expansion audio mixing unit during the number of included signal conversion unit number or input and output sound channel in having known channel expansion audio mixing unit.So audio signal decoder can dispose channel expansion audio mixing unit in the mode of the number of the number that extracts signal conversion unit in the configuration information from be included in spatial signal information 105 109 or input and output sound channel.
The audio signal decoder serial interpretation channel configuration information that starts from scratch.In detect the number of cutting apart identifier 1 that is included in the channel configuration information and the as many situation of signal conversion unit number that extracts from configuration information, audio signal decoder does not need further to read channel configuration information.This is because the number of cutting apart identifier 1 that is included in the channel configuration information equals to be included in the number of the signal conversion unit in the channel expansion audio mixing unit, is imported into signal conversion unit because cut apart identifier 1 indicative audio signal.
Particularly, as mentioned in the above example, if the channel configuration information of being represented by longitudinal method is 110011000000, then audio signal decoder need read 12 bits ability decoded channels configuration information altogether.Yet, be 4 if audio signal decoder detects the number of signal conversion unit, the numeral 1 that audio signal decoder is decoded in being included in channel configuration information to channel configuration information occurs 4 times.That is, audio signal decoder only is decoded to 110011 with channel configuration information.Although this is not cut apart identifier 0 because no longer further use channel configuration information, remaining value to be represented as.Therefore, 6 bits because audio signal decoder needn't be decoded, decoding efficiency just can be improved.
In channel structure is that additional information is nonessential, because the number of the number of signal conversion unit or input and output sound channel is included in the configuration information that is comprised in the spatial information 105 in the situation of the fixedly channel structure preset.Yet, in channel structure is in the situation of its channel structure channel structure at random undetermined, need additional information to come the number of indicator signal converter unit or the number of input and output sound channel, because the number of the number of signal conversion unit or input and output sound channel is not included in the spatial signal information 105.
With the information about signal conversion unit is example, in the situation of only using the OTT frame as signal conversion unit, is used to indicate the information of signal conversion unit can be represented as maximum 5 bits.Pass in the situation of OTT or TTT frame at the input signal that enters channel expansion audio mixing unit, input signal is transformed into two signals or two input signals are transformed into three signals.So the number of output channels is that input signal is added the value that the number of OTT or TTT frame obtains.Therefore, the number of signal conversion unit is that number with output channels deducts the value that the number of the number of input signal and TTT frame obtains.Because generally can use maximum 32 output channels, so be used to indicate the information of signal conversion unit can be represented as the interior value of 5 bits.
Therefore, if channel configuration information represent by longitudinal method, and if channel structure be channel structure at random, then audio signal encoding apparatus should be expressed as maximum 5 bits separately with the number of signal conversion unit in spatial signal information 105.In above example, need 6 bit channel configuration information and 5 bits to be used to indicate the information of signal conversion unit.That is, need 11 bits altogether.This shows with represented channel configuration information by horizontal method compares, and the required bit quantity in configuration channel expansion audio mixing unit has reduced.Therefore, if channel configuration information is represented that by longitudinal method then bit number can reduce.
Fig. 8 is the block diagram of audio signal decoder according to an embodiment of the invention.
With reference to figure 8, audio signal decoder according to an embodiment of the invention comprises receiving element, demultiplex unit, core codec unit, spatial information decoding unit, signal layout unit, multichannel generation unit and loudspeaker map unit.
Receiving element 801 receives the sound signal that comprises down-mix audio signal 103 and spatial signal information 105.
The sound signal that demultiplex unit 803 receives receiving element 801 resolves to encoded down-mix audio signal 103 and encoded spatial signal information 105, then encoded down-mix audio signal 103 and encoded spatial signal information 105 is sent to core codec unit 805 and spatial information decoding unit 807 respectively.
Mentioned as described above, spatial information decoding unit 807 is by extracting frame identifier, number of time slot, parameter set number, time slot position information etc. and coming spatial signal information 105 is decoded by parameter set being put on time slot corresponding from spatial signal information 105.
Audio signal decoder can comprise signal layout unit 809.Thereby signal layout unit 809 comes a plurality of down-mix audio signal of layout to come carrying out the channel expansion audio mixing through the down-mix audio signal 103 of decoding according to default layout.Particularly, signal layout unit 809 becomes the individual sound signal of M ' with the N-M-N channel configuration with M down-mix audio signal layout.
Audio signal decoder can directly carry out the channel expansion audio mixing to down-mix audio signal according to the order that down-mix audio signal is passed core codec unit 805.Yet in some cases, audio signal decoder can be carried out the channel expansion audio mixing after the order of layout down-mix audio signal.
In some cases, the signal layout can be done the signal execution that sound channel expansion audio mixing becomes the signal conversion unit of three signals with two down-mix audio signal to entering.
In the situation of sound signal being carried out the signal layout or at input signal only, carry out in the situation of signal layout, indicate the signal arrangement information of corresponding situation to be included in the sound signal by audio signal encoding apparatus to the TTT frame.In this case, the signal arrangement information be meant be shown in sound signal revert to burst before the multichannel whether will be by layout so that carry out the channel expansion audio mixing, whether only will carry out the identifier of layout etc. to signal specific.
If head 107 is included in the spatial signal information 105, then audio signal decoder uses the sound signal arrangement information be included in from the head in the configuration information 109 that extracts in 107 to come the layout down-mix audio signal.
If head 107 is not included in the spatial signal information 105, then audio signal decoder can use the sound signal arrangement information that extracts in the configuration information 109 from be included in last head 107 to come the layout sound signal
Audio signal decoder can not carried out the down-mix audio signal layout.Particularly, audio signal decoder can be by directly to 805 decodings and the signal that is sent to multichannel generation unit 811 carry out the channel expansion audio mixing rather than carry out the down-mix audio signal layout generating multichannel through the core codec unit.This is to reach because the expectation purpose of signal layout can be mapped to loudspeaker by the multichannel that will generate.In this case, just can compress more expeditiously and transmitting audio signal by not inserting in the sound signal about the information of down-mix audio signal layout.And the complexity of decoding device can reduce because of not carrying out the signal layout in addition.
Audio signal decoder comprise loudspeaker map unit 813 with audio signal output that will be by multichannel generation unit 811 to loudspeaker.
[table 1]
| | Loudspeaker | |
| 0 | FL: |
|
| 1 | FR: |
|
| 2 | FC: in before | |
| 3 | LFE: low frequency strengthens | |
| 4 | BL: left back |
| 5 | BR: right back |
| 6 | FLC: in |
| 7 | FRC: in |
| 8 | BC: in after |
| 9 | SL: |
| 10 | SR: |
| 11 | TC: on |
| 12 | TFL: on left front |
| 13 | TFC: in before on |
| 14 | TFR: on right front |
| 15 | TBL: on left back |
| 16 | TBC: on the middle back |
| 17 | TBR: on right back |
| 18...31 | Keep |
Generally speaking, maximum 32 loudspeakers can be mapped to output audio signal.So, as shown in table 1, loudspeaker map unit 813 can be mapped to corresponding to each digital loudspeaker (loudspeaker) sound signal to give multi-channel audio signal in the mode of (bsOutputChannelPos) specific in the numeral between 0 and 31.In this case, because in 32 loudspeakers should be selected being mapped to loudspeaker from first sound signal the multi-channel audio signal of multichannel generation unit 811 outputs, so need 5 bits altogether.Because one in remaining 31 loudspeaker should be selected so that second sound signal is mapped to loudspeaker, so also need 5 bits.According to this method, because in remaining 16 loudspeaker should be selected so that the tenth seven tunes frequency signal map is arrived loudspeaker, so need 4 bits.Particularly, along with the number increase of the sound signal of shining upon, indication map just reduces to the required quantity of information of the loudspeaker of sound signal.This can be mapped to sound signal the ceil[log of the required bit number of loudspeaker by expression
2(32-bsOutputChannelPos)] express.Increase owing to treat the number of the sound signal of layout, required bit number reduces, the situation that this increases applicable to the down-mix audio signal number by 809 layouts of signal layout unit.Therefore, audio decoding apparatus is mapped to loudspeaker with multi-channel audio signal and exports corresponding signal then.
Although this paper describes and illustrated the present invention with reference to the preferred embodiments of the present invention, those skilled in the art will know and can make various modifications and distortion in the present invention and can not break away from the spirit and scope of the present invention.Therefore, the present invention is intended to contain modification of the present invention and the distortion that falls in claims and the equivalence techniques scheme scope thereof.
[beneficial effect]
Therefore, by the devices and methods therefor for decoded audio signal according to the present invention, can with selective be included in the spatial signal information.
By the devices and methods therefor for decoded audio signal according to the present invention, can be the positional representation of the time slot that will apply parameter set be reduced the data volume of transmission as the mode of variable number of bits.
By the devices and methods therefor for decoded audio signal according to the present invention, can promote audio signal compression and transmission efficiency will carry out the down-mix audio signal layout or multichannel is mapped to the mode that the required apsi message of loudspeaker is shown minimum variable number of bits.
By the devices and methods therefor for decoded audio signal according to the present invention, can come to make audio signal be compressed more expeditiously and transmits to the mode of carrying out the channel expansion audio mixing through core codec unit decodes and the signal that is sent to the multichannel generation unit to carry out in order and not down-mix audio signal layout ground, and the complexity of reduction audio signal decoder.
[accompanying drawing summary]
Fig. 1 is the arrangement plan of sound signal according to an embodiment of the invention.
Fig. 2 is the process flow diagram of the method that sound signal is decoded according to another embodiment of the invention.
Fig. 3 is the process flow diagram of the method that sound signal is decoded according to another embodiment of the invention.
Fig. 4 is the sentence structure of the positional information of the time slot that applies parameter set according to an embodiment of the invention.
Fig. 5 be according to another embodiment of the invention pass through parameter set is put on the decode process flow diagram of method of spatial signal information of time slot.
Fig. 6 and Fig. 7 are the synoptic diagram of the channel expansion audio mixing unit of audio signal decoder according to an embodiment of the invention.
Fig. 8 is the block diagram of audio signal decoder according to an embodiment of the invention.
[optimal mode]
In order to realize these and other advantage, according to an aspect of the present invention, a kind of method of decoded audio signal is provided, comprise: receive the audio signal that comprises spatial signal information and down-mix audio signal, utilization is included in the positional information that number of time slot in the audio signal and number of parameters obtain time slot, by the positional information according to time slot spatial signal information is put on down-mix audio signal and generate multi-channel audio signal, and multi-channel audio signal correspondingly is formatted to output channels.
The positional information of time slot can be expressed as variable number of bits. And positional information can comprise initial value and difference, and wherein initial value indication applies the positional information of the time slot of the first parameter, and wherein the difference indication will apply second or the positional information of the time slot of subsequent parameter. And this initial value can be expressed as at least one variable number of bits that decides of using in number of time slot and the number of parameters. And this difference table can be shown at least one variable number of bits that decides in the positional information of the time slot that uses number of time slot, number of parameters and apply last parameter. And the method also comprises the down-mix audio signal of down-mix audio signal layout one-tenth according to presetting method. And the layout down-mix audio signal can be done the down-mix audio signal execution that sound channel expansion audio mixing becomes the signal conversion unit of three signals with two down-mix audio signal to entering. And if head is included in the spatial signal information, then the down-mix audio signal layout can come the layout down-mix audio signal with the audio signal arrangement information in the configuration information that extracts in being included in from the head. Shine upon the i audio signal or the required information content of layout i down-mix audio signal can be to be equal to or greater than log2The smallest positive integral of [(audio signal sum or down-mix audio signal sum)-(' i ' value)+1]. And the layout of multi-channel audio signal can further comprise audio signal correspondingly is formatted to loudspeaker.
According to a further aspect in the invention, a kind of device for decoded audio signal is provided, has comprised audio signal sound channel expansion audio mixing is become the channel expansion audio mixing unit of multi-channel audio signal and the multichannel layout unit that multi-channel audio signal is mapped to output channels according to default layout.
According to a further aspect in the invention, a kind of device for decoded audio signal is provided, has comprised that the default layout of core codec unit, basis that encoded down-mix audio signal is decoded comes layout through the layout unit of the audio signal of decoding and will make the channel expansion audio mixing unit that sound channel expansion audio mixing becomes multi-channel audio signal through the audio signal of layout.
Claims (12)
1. the method for a decoded audio signal, it comprises:
Reception comprises the sound signal of spatial signal information and down-mix audio signal;
Use is included in the positional information that number of time slot in the described sound signal and number of parameters obtain time slot;
By positional information described spatial signal information is put on described down-mix audio signal and generate multi-channel audio signal according to described time slot; And
Described multi-channel audio signal correspondingly is formatted to output channels.
2. the method for claim 1 is characterized in that, the positional information of described time slot is represented as variable number of bits.
3. method as claimed in claim 2, it is characterized in that, described positional information comprises initial value and difference, and the indication of wherein said initial value applies the positional information of the time slot of first parameter, and the indication of described difference applies second or the positional information of the time slot of subsequent parameter.
4. method as claimed in claim 3 is characterized in that, described initial value is represented as at least one variable number of bits that decides of utilizing in described number of time slot and the described number of parameters.
5. method as claimed in claim 3 is characterized in that, described difference is represented as at least one variable number of bits that decides in the positional information of the time slot that utilizes described number of time slot, described number of parameters and apply last parameter.
6. the method for claim 1 is characterized in that, further comprises according to the described down-mix audio signal of presetting method layout.
7. method as claimed in claim 6 is characterized in that, described layout down-mix audio signal is two down-mix audio signal are made sound channel expansion audio mixing to become the described down-mix audio signal of the signal conversion unit of three signals to carry out entering.
8. as claim 6 or 7 described methods, it is characterized in that, if head is included in the described spatial signal information, then described down-mix audio signal is to utilize the sound signal arrangement information that is included in the configuration information that extracts from described head to come layout.
9. as each the described method in the claim 1,2 and 6, it is characterized in that, shine upon the i sound signal or the required quantity of information of layout i down-mix audio signal is to be equal to or greater than log
2The smallest positive integral of [(sound signal sum or down-mix audio signal sum)-(' i ' value)+1].
10. device that is used for decoded audio signal, it comprises:
Sound signal is made the channel expansion audio mixing unit that sound channel expansion audio mixing becomes multi-channel audio signal; And
Described multi-channel audio signal is mapped to the multichannel layout unit of output channels according to default layout.
11. a device that is used for decoded audio signal, it comprises:
The core codec unit that encoded down-mix audio signal is decoded;
Come the layout unit of the described sound signal of layout according to default layout through decoding; And
To make the channel expansion audio mixing unit that sound channel expansion audio mixing becomes multi-channel audio signal through the sound signal of layout.
12. the method for claim 1 is characterized in that, described layout multi-channel audio signal also comprises described sound signal correspondingly is formatted to loudspeaker.
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| US72622805P | 2005-10-14 | 2005-10-14 | |
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| US73562805P | 2005-11-12 | 2005-11-12 | |
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| KR10-2006-0004056 | 2006-01-13 | ||
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| KR1020060056480 | 2006-06-22 | ||
| KR10-2006-0056480 | 2006-06-22 | ||
| PCT/KR2006/003435 WO2007027056A1 (en) | 2005-08-30 | 2006-08-30 | A method for decoding an audio signal |
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| CN101253552B CN101253552B (en) | 2013-04-03 |
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| CN2006800316332A Active CN101253553B (en) | 2005-08-30 | 2006-08-30 | Method for decoding an audio signal |
| CN200680031519XA Expired - Fee Related CN101253808B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
| CN2006800316690A Active CN101253554B (en) | 2005-08-30 | 2006-08-30 | Method and device for decoding an audio signal |
| CN200680031480.1A Expired - Fee Related CN101253806B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
| CN200680031505.8A Expired - Fee Related CN101253807B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
| CN200680031572XA Active CN101253809B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
| CN2006800316192A Expired - Fee Related CN101253810B (en) | 2005-08-30 | 2006-08-30 | Method and apparatus for encoding and decoding an audio signal |
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| CN2006800316690A Active CN101253554B (en) | 2005-08-30 | 2006-08-30 | Method and device for decoding an audio signal |
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| AU2006285538B2 (en) | 2005-08-30 | 2011-03-24 | Lg Electronics Inc. | Apparatus for encoding and decoding audio signal and method thereof |
| KR20070025905A (en) * | 2005-08-30 | 2007-03-08 | 엘지전자 주식회사 | Method of effective sampling frequency bitstream composition for multi-channel audio coding |
| CN101930738B (en) * | 2009-06-18 | 2012-05-23 | 晨星软件研发(深圳)有限公司 | Multi-track audio signal decoding method and device |
| CN102025393B (en) * | 2009-09-09 | 2013-08-14 | 华为技术有限公司 | Data transmission method and device |
| US8428936B2 (en) * | 2010-03-05 | 2013-04-23 | Motorola Mobility Llc | Decoder for audio signal including generic audio and speech frames |
| US8605564B2 (en) * | 2011-04-28 | 2013-12-10 | Mediatek Inc. | Audio mixing method and audio mixing apparatus capable of processing and/or mixing audio inputs individually |
| CN102419978B (en) * | 2011-08-23 | 2013-03-27 | 展讯通信（上海）有限公司 | Audio decoder and frequency spectrum reconstructing method and device for audio decoding |
| TWM487509U (en) * | 2013-06-19 | 2014-10-01 | 杜比實驗室特許公司 | Audio processing apparatus and electrical device |
| SG11201600466PA (en) | 2013-07-22 | 2016-02-26 | Fraunhofer Ges Forschung | Multi-channel audio decoder, multi-channel audio encoder, methods, computer program and encoded audio representation using a decorrelation of rendered audio signals |
| EP2830334A1 (en) | 2013-07-22 | 2015-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Multi-channel audio decoder, multi-channel audio encoder, methods, computer program and encoded audio representation using a decorrelation of rendered audio signals |
| CN105556837B (en) | 2013-09-12 | 2019-04-19 | 杜比实验室特许公司 | Dynamic range control for various playback environments |
| CN105898669B (en) * | 2016-03-18 | 2017-10-20 | 南京青衿信息科技有限公司 | A kind of coding method of target voice |
| CN114333862B (en) * | 2021-11-10 | 2024-05-03 | 腾讯科技（深圳）有限公司 | Audio encoding method, decoding method, device, equipment, storage medium and product |
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| AU653582B2 (en) * | 1991-01-08 | 1994-10-06 | Dolby Laboratories Licensing Corporation | Encoder/decoder for multidimensional sound fields |
| US5481643A (en) * | 1993-03-18 | 1996-01-02 | U.S. Philips Corporation | Transmitter, receiver and record carrier for transmitting/receiving at least a first and a second signal component |
| US5956674A (en) * | 1995-12-01 | 1999-09-21 | Digital Theater Systems, Inc. | Multi-channel predictive subband audio coder using psychoacoustic adaptive bit allocation in frequency, time and over the multiple channels |
| US6339760B1 (en) * | 1998-04-28 | 2002-01-15 | Hitachi, Ltd. | Method and system for synchronization of decoded audio and video by adding dummy data to compressed audio data |
| US6757659B1 (en) * | 1998-11-16 | 2004-06-29 | Victor Company Of Japan, Ltd. | Audio signal processing apparatus |
| US6631352B1 (en) * | 1999-01-08 | 2003-10-07 | Matushita Electric Industrial Co. Ltd. | Decoding circuit and reproduction apparatus which mutes audio after header parameter changes |
| CN1240048C (en) * | 2001-04-18 | 2006-02-01 | 皇家菲利浦电子有限公司 | Audio coding |
| AU2002343151A1 (en) * | 2001-11-23 | 2003-06-10 | Koninklijke Philips Electronics N.V. | Perceptual noise substitution |
| WO2003085644A1 (en) * | 2002-04-11 | 2003-10-16 | Matsushita Electric Industrial Co., Ltd. | Encoding device and decoding device |
| KR101016982B1 (en) * | 2002-04-22 | 2011-02-28 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Decoding apparatus |
| KR20070025905A (en) * | 2005-08-30 | 2007-03-08 | 엘지전자 주식회사 | Method of effective sampling frequency bitstream composition for multi-channel audio coding |
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| CN101253809A (en) | 2008-08-27 |
| CN101253551A (en) | 2008-08-27 |
| CN101253807B (en) | 2014-04-02 |
| CN101253551B (en) | 2012-11-28 |
| CN101248484B (en) | 2012-06-13 |
| CN101253810B (en) | 2011-12-14 |
| CN101253810A (en) | 2008-08-27 |
| KR20070025905A (en) | 2007-03-08 |
| CN101253553B (en) | 2012-09-19 |
| CN101253807A (en) | 2008-08-27 |
| CN101253809B (en) | 2011-12-28 |
| CN101253553A (en) | 2008-08-27 |
| CN101253552B (en) | 2013-04-03 |
| CN101248484A (en) | 2008-08-20 |
| CN101253554B (en) | 2011-12-07 |
| CN101253808B (en) | 2012-05-23 |
| CN101253554A (en) | 2008-08-27 |
| CN101253808A (en) | 2008-08-27 |
| CN101253806B (en) | 2015-05-13 |
| CN101253806A (en) | 2008-08-27 |
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