CN101197134A - Method and apparatus for eliminating influence of encoding mode switch-over, decoding method and device - Google Patents
Method and apparatus for eliminating influence of encoding mode switch-over, decoding method and device Download PDFInfo
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Abstract
The invention discloses a method for eliminating coding mode switch influence, which comprises the following steps: receiving the current frame and determining the difference of the coding mode adopted in a foregoing frame and a current frame; obtaining a system function of the current frame and computing the zero state response of the system function; and taking the zero state response value as the value of the current frame and coding the value of the current frame. The invention further discloses a device for eliminating coding mode switch influence, which comprises the following parts: a coding unit, a coding module determining unit, a zero state response computing unit and a replacing unit. The invention further discloses a decoding method and a device which is applicable to the coding method for eliminating coding mode switch influence. The method and the device disclosed according to the invention can reduce the complexity of algorithm and improve the coding performance.
Description
Technical field
The present invention relates to encoding and decoding technique, be meant a kind of method and apparatus and coding/decoding method and device of eliminating influence of encoding mode switch-over especially.
Background technology
Along with the expansion of development of Communication Technique and multimedia service, the requirement of coding techniques is improved constantly.Strengthening the how fast broadband of self-adaptation (AMR-WB+) coding techniques is the coding techniques that is applied to digital audio encoding at present.
Fig. 1 (a) is depicted as and strengthens the how fast broadband of self-adaptation (AMR-WB+) scrambler schematic block diagram.Shown in Fig. 1 (a), in the cataloged procedure of AMR-WB+, after original input signal carried out Signal Pretreatment, utilize bank of filters that original input signal is divided into high-frequency signal and low frequency signal, then high-frequency signal and low frequency signal are adopted the different coding pattern-coding respectively, high-frequency signal is adopted the high-frequency coding pattern, low frequency signal is adopted the low frequency coding mode.
In AMR-WB+, the low frequency coding mode comprises two kinds, Algebraic Code Excited Linear Prediction (ACELP) pattern and transform coded excitation (TCX) pattern.ACELP is a kind of encoding scheme that is suitable for voice signal, and TCX is a kind of encoding scheme that is suitable for music signal.In AMR-WB+, when low frequency signal is encoded, when between ACELP and two kinds of coding modes of TCX, switching,, realize two kinds of switchings between the coding mode by the following method in order to reduce of the influence of last coding mode to the present encoding pattern.When present frame is adopted the TCX coding mode, if former frame adopts the ACELP coding mode, after then present frame obtains weights signal by the weight wave filter, preceding 2 subframes of calculating present frame are preceding 128 zero input response (ZIR), to the zero input response windowing, the zero input response after the removal windowing from weights signal then.Then, the weights signal of the zero input response of removing windowing is carried out adaptive windows effect, transform domain coding etc.
In the cataloged procedure of AMR-WB+, utilize the output state of former frame wave filter, the preceding zero input response of computing system function H (z) at 128.If z (n) is the value of zero input response, z
w(n) be H (z) to be carried out ZIR calculate and carry out value after the windowing process, then have:
z
w(n)＝z(n)*w(n) n＝0～2*N-1
Wherein, w (n) is the time domain window function, and N=64 has following form:
w(n)＝1 n＝0～N-1
w(n)＝(2*N-n)/N n＝N～2*N-1
Corresponding with above AMR-WB+ scrambler, Fig. 1 (b) is depicted as AMR-WB+ demoder schematic block diagram.In AMR-WB+, corresponding with the low frequency coding mode, the low frequency decoding schema also comprises two kinds, ACELP pattern and TCX pattern.Shown in Fig. 1 (b), in the decode procedure of AMR-WB+, when the low frequency decoded bit stream in the decoded bit stream is decoded, to the code stream of encoding by ACELP at coding side, adopt the ACELP mode decoding,, adopt the TCX mode decoding at the code stream of coding side by the TCX coding.In the low frequency decode procedure, when present frame is adopted the TCX decoding schema, if former frame adopts the ACELP decoding schema, the then zero input response of computing system in current code stream, and after it is carried out windowing process, the value that obtains after the decoding is added that zero input response after the windowing is as the value of present frame.
As mentioned above, in AMR-WB+, when coding mode switches to TCX from ACELP, in the TCX cataloged procedure,, calculate zero input response in order to eliminate the influence of former frame to present frame, and zero input response carried out windowing, and then deduct zero input response after the windowing with weights signal, and therefore, the computation complexity height.Corresponding with cataloged procedure, in AMR-WB+, when decoding schema switches to TCX from ACELP, in the TCX decode procedure, calculate zero input response, and after zero input response carried out windowing, again decoded signal is added zero input response after the windowing, therefore, the computation complexity height.
Summary of the invention
The embodiment of the invention provides a kind of method of eliminating influence of encoding mode switch-over, reduces computation complexity.
The embodiment of the invention provides a kind of device of eliminating influence of encoding mode switch-over, reduces computation complexity.
The embodiment of the invention provides a kind of coding/decoding method, reduces computation complexity.
The embodiment of the invention provides a kind of decoding device, reduces computation complexity.
The embodiment of the invention provides a kind of method of eliminating influence of encoding mode switch-over, and this method comprises: receive present frame and determine in former frame different with the coding mode that present frame is adopted; Obtain the system function of present frame, calculate the zero state response of this system function; With the value of zero state response value, and the value of present frame encoded as present frame.
The embodiment of the invention provides a kind of device of eliminating influence of encoding mode switch-over, and this device comprises: coding unit, and the coding mode determining unit, the zero state response computing unit is replaced the unit; Wherein, described coding unit is used for present frame is encoded; Described coding mode determining unit is used for determining whether former frame is identical with the coding mode that present frame adopts, and result inequality is sent to described zero state response computing unit; Described zero state response computing unit calculates zero state response at present frame, and the zero state response value that calculates is sent to described replacement unit after being used to receive coding mode that described former frame and present frame adopt result inequality; Described replacement unit is used to receive the input signal of present frame, and uses the input signal of replacing present frame from the zero state response value of zero state response computing unit reception, and the input signal of the present frame after will replacing is given described coding unit.
The embodiment of the invention provides a kind of coding/decoding method that is applicable to the coding method of described elimination influence of encoding mode switch-over, receives the decoded bit stream of present frame, according to the decoding schema of present frame present frame is decoded; Determine that former frame is different with the decoding schema that present frame is adopted; The value that decoding obtains to present frame is as the value of present frame.
The embodiment of the invention provides a kind of decoding device, and this device comprises: decoding unit, decoding schema determining unit, processing unit; Described decoding unit is used to receive the decoded bit stream of present frame, according to the decoding schema of present frame present frame is decoded; Described decoding schema determining unit is used for determining whether former frame is identical with the decoding schema that present frame adopts, and result inequality is sent to described processing unit; After described processing unit was used to receive decoding schema that described former frame and present frame adopt result inequality, the value that decoding obtains to present frame was as the value of present frame.
Method and apparatus according to elimination influence of encoding mode switch-over provided by the invention, in the cataloged procedure of present frame, if former frame adopts the coding mode different with the coding mode of present frame, then in order to eliminate the influence of former frame to present frame, calculate the value of the value of zero state response as present frame, thereby the minimizing algorithm complex can also improve coding efficiency.
According to coding/decoding method provided by the invention and device, can adapt to the coding method of described elimination influence of encoding mode switch-over, reduce computation complexity.
Description of drawings
Fig. 1 (a) is depicted as AMR-WB+ scrambler schematic block diagram in the prior art;
Fig. 1 (b) is depicted as AMR-WB+ scrambler schematic block diagram in the prior art;
Figure 2 shows that the method flow diagram of eliminating influence of encoding mode switch-over in the embodiment of the invention 1;
Figure 3 shows that the method flow diagram of in the TCX cataloged procedure, eliminating the influence of ACELP coding mode in the embodiment of the invention 2;
Figure 4 shows that the method flow diagram of in the TCX cataloged procedure, eliminating the influence of ACELP coding mode in the embodiment of the invention 3;
Figure 5 shows that the device synoptic diagram of eliminating influence of encoding mode switch-over in the embodiment of the invention 4;
Figure 6 shows that decoding process figure in the embodiment of the invention 5;
Figure 7 shows that AMR-WB+ decoding process figure in the embodiment of the invention 6;
Figure 8 shows that the structural drawing of decoding device in the embodiment of the invention 7.
Concrete Implementation Modes
For making the purpose, technical solutions and advantages of the present invention clearer, lift specific embodiment below, the present invention is further detailed explanation.
The embodiment of the invention provides a kind of coding mode changing method, its main thought is: in the cataloged procedure of present frame, if determine that former frame is different with the coding mode that present frame is adopted, then in order to eliminate the influence of former frame to present frame, the value of the zero state response of calculating present frame is as the value of present frame.
Embodiment 1
Present embodiment 1 is given in the cataloged procedure, and when having the switching between two kinds of coding modes, a kind of coding mode is to the method for the influence of a kind of coding mode in back before eliminating.In the present embodiment 1, two kinds of coding modes are called first coding mode and second coding mode.Be illustrated in figure 2 as in the present embodiment 1, in cataloged procedure, eliminate the method flow diagram of influence of encoding mode switch-over, may further comprise the steps:
Step 201: when present frame being adopted second coding mode coding, judge whether former frame adopts first coding mode coding, if then execution in step 202; Otherwise if former frame adopts second coding mode coding, then execution in step 203.
The judgement of this step is actually, if present frame is different with the coding mode that former frame adopts, then execution in step 202, and present frame is identical with the coding mode that former frame adopts, then direct execution in step 203.
Step 202: obtain the system function of present frame, calculate the zero state response of this system function, with the value of zero state response value as present frame.
Wherein, system function before present frame by calculating.The zero state response of system function is: the system's output with former frame in system function is changed to zero, the response that the input signal of present frame obtains by this system function.Concrete calculation procedure is: the impulse response of computing system function with the input signal of impulse response convolution present frame, obtains the zero state response of system function.
At this, can only calculate the zero state response of limited sequence of present frame, and replace the value of limited sequence of described present frame with resulting zero state response value, the value of other sequence is not done any variation in the present frame.By this step 202, when former frame adopts first coding mode, when present frame adopts second coding mode, zero owing to when calculating zero state response, the state before the present frame being changed to, replace corresponding value with the zero state response value then, so can eliminate the influence of former frame to present frame.
In order to take over seamlessly coding, can also carry out windowing process to the zero state response value, then with the value of the zero state response value after the windowing as present frame.Wherein, window function can adopt the monotonically increasing window function.
Step 203: present frame is adopted second coding mode coding.
In the present embodiment 1,,, realize simple so computation complexity is low owing to when eliminating the influencing of first coding mode, only need to calculate zero state response.Also have,, when present frame is adopted second coding mode coding, can from present frame, eliminate the influence of former frame, thereby improve the coding efficiency of second coding mode when former frame being adopted first coding mode coding.
Present embodiment 1 described method can be applied in the handoff procedure of any two kinds of coding modes.For example, described first coding mode can be the ACELP pattern, and second coding mode is the transform domain coding pattern, is specifically as follows the TCX pattern.Below, in conjunction with concrete coding example, introduce the method for switching coding mode in detail.
Embodiment 2
When present embodiment 2 provides the switching that exists between ACELP and the TCX, in the TCX cataloged procedure, eliminate the method for the influence of ACELP coding mode.As shown in Figure 1, original input signal carried out Signal Pretreatment after, utilize bank of filters that original input signal is divided into high-frequency signal and low frequency signal; When low frequency signal is encoded, voice signal is adopted ACELP coding mode coding, music signal is adopted TCX coding mode coding., adopt in the process of TCX coding mode coding when low frequency signal is encoded described,, as follows present frame carried out the TCX coding, as shown in Figure 3, may further comprise the steps in order to eliminate the influence of the former frame that adopts the ACELP coding mode to present frame:
Step 301: the input signal of present frame obtains weights signal by the weight wave filter.
Step 302: judge whether former frame adopts ACELP coding mode coding, if then execution in step 303; Otherwise, execution in step 305.
Step 303:, calculate the zero state response of limited sequence at present frame.
At this, described zero state response is the zero state response of the system function of present frame.The zero state response of described limited sequence is: in system function the output state of former frame is changed to zero, the response that the input signal of limited sequence obtains after by this system function in the present frame.Concrete calculation procedure is: the impulse response of computing system function with the input signal of limited sequence in the impulse response convolution present frame, obtains the zero state response of described limited sequence.
At this, described limited sequence is limited continuous sequence before the present frame, can be the subframe of preceding several successive, and for example, preceding 2 continuous subframes also can be preceding several continuity points.The sequence length that calculates zero state response can calculate the zero state response of preceding 2 subframes according to the actual conditions setting, the zero state response of promptly preceding 128 points.
The described system function of this step is:
Wherein,
Be the quantification linear filter that obtains by linear prediction analysis,
Be composite filter,
Be perceptual weighting filter,
It is the weight wave filter.
Step 304: in present frame, use the value of the zero state response of limited the sequence that obtains to replace corresponding limited sequence in the weights signal.
For example, present frame comprises 4 subframes, supposes in step 303, only calculated the zero state response of preceding 2 subframes, then in this step 304, the value of the weights signal in preceding 2 subframes is updated to the value of the zero state response of described preceding 2 subframes, then the weights signal in 2 subframes are not upgraded.Like this, owing to upgraded the part value of weights signal,, can reduce the performance loss that the former frame coding mode brings the coding of present frame so can eliminate the influence of former frame to present frame with the value of zero state response.
Step 305: weights signal is carried out the TCX coding, specifically can carry out self-adaptation windowing process, transform domain coding etc.
In this step 305, if former frame adopts ACELP coding mode coding, then to replace the weights signal coding of analog value in the step 304 with the zero state response value; If former frame does not adopt ACELP coding mode coding, then directly the weights signal that obtains by the weight wave filter in the step 301 is encoded.
When low frequency signal is carried out the TCX coding, former frame to the less prerequisite of the influence of present frame under, in other words, under the prerequisite that coding efficiency allows, can not calculate zero state response, can directly encode the weights signal that obtains by the weight wave filter.
Embodiment 3
Present embodiment 3 is provided on the basis of embodiment 2, increases the windowing process to zero state response.Figure 4 shows that in the present embodiment 3, adopt in the process of TCX coding mode coding, eliminate the method flow diagram of the former frame of employing ACELP coding mode the influence of present frame.
Step 401: the input signal of present frame obtains weights signal by the weight wave filter.
Step 402: judge whether former frame adopts ACELP coding mode coding, if then execution in step 403; Otherwise, execution in step 406.
Step 403:, calculate the zero state response of limited sequence at present frame.
Step 404: to the zero state response value windowing of described limited sequence.
The number that is provided with a limit sequence is 2*N, and z (n) is the value of zero state response, z
w(n) be to the value after z (n) windowing process, then have:
z
w(n)＝z(n)*w(n) n＝0～2*N-1
Wherein, w (n) is the time domain window function.At this, can adopt different window functions to carry out to the windowing process of zero state response value, for example, the window function w (n) of time domain can for:
w(n)＝n/N n＝0～N-1
w(n)＝1 n＝N～2*N-1
By windowing, can adjust the energy distribution of sequence, like this, can take over seamlessly coding, strengthen coding efficiency.
Step 405: in present frame, use the zero state response value of limited sequence of the windowing that obtains to replace corresponding limited sequence in the weights signal.
Step 406: weights signal is carried out the TCX coding, specifically can carry out self-adaptation windowing process, transform domain coding etc.
Embodiment 4
Embodiment 4 is given in the device of eliminating influence of encoding mode switch-over in the cataloged procedure.Figure 5 shows that the structure drawing of device of in cataloged procedure, eliminating influence of encoding mode switch-over, as shown in Figure 5, the device of elimination influence of encoding mode switch-over comprises in cataloged procedure: coding unit, coding mode determining unit, the zero state response computing unit is replaced the unit.Described coding unit is encoded to present frame; Described coding mode determining unit determines whether former frame is identical with the coding mode that present frame adopts, and result inequality is sent to described zero state response computing unit; Described zero state response computing unit calculates zero state response at present frame, and the zero state response value that calculates is sent to described replacement unit after receiving coding mode that described former frame and present frame adopt result inequality; Described replacement unit is used to receive the input signal of present frame, and uses the input signal of replacing present frame from the zero state response value of zero state response computing unit reception, and the input signal of the present frame after will replacing is given described coding unit.
This device can further include and adds window unit.The described window unit that adds receives the zero state response value that described zero state response computing unit is exported, and to the windowing of zero state response value, the zero state response value after the windowing is exported to described replacement unit.Like this, replace the input signal that the zero state response value of unit after with windowing replaced present frame.
This device can further include pretreatment unit.Described pretreatment unit receives the input signal of present frame, and input signal is carried out weight filtering, obtains weights signal, and passes to described replacement unit; Weights signal is replaced with the zero state response value in described replacement unit, and the weights signal after will replacing is given described coding unit.
Device shown in the present embodiment 4 is actually a kind of code device, and being used to has the coding that switches between two kinds of coding modes.For example, in the low frequency encoding scheme in AMR-WB+ scrambler shown in Figure 1, this device can be used for the TCX scrambler.
Above embodiment provides the coding method that can eliminate influence of encoding mode switch-over, provides the coding/decoding method that is applicable to above-mentioned coding method below.
Embodiment 5
Present embodiment 5 provides the coding/decoding method that is applicable to coding method among the embodiment 1.In the present embodiment 5, be called first decoding schema and second decoding schema with two kinds of corresponding two kinds of decoding schemas of coding mode.Figure 6 shows that decoding process figure in the present embodiment 5, comprise following step:
Step 601: decoding end receives decoded bit stream, determines the decoding schema to the present frame employing, and adopts determined decoding schema to decode.
At this, decoding schema can be determined according to the zone bit that carries in the decoded bit stream.If present frame is adopted first coding mode coding, then need to adopt the decoding of first decoding schema, if present frame is adopted second coding mode coding, then need to adopt the decoding of second decoding schema.
Step 602: when present frame being adopted the decoding of second decoding schema, judge whether former frame adopts the decoding of first decoding schema, if then execution in step 603; Otherwise if former frame adopts the decoding of second decoding schema, then execution in step 604.
Step 603: the value that will adopt the decoding of second decoding schema to obtain, as the value of present frame, process ends.
Step 604: to the value that adopts second decoding schema decoding to obtain overlap (overlap-and-add) handle, obtain the value of present frame, process ends.
At this, overlap-and-add is existing disposal route, be before and after the decoding schema of two frames when identical, the processing that the crossover region between two frames is carried out.
In the present embodiment 5, corresponding with coding side, described first decoding schema can be the ACELP pattern, and second decoding schema can be the transform domain decoding schema, is specifically as follows the TCX pattern.
Embodiment 6
Present embodiment 6 provides the coding/decoding method that is applicable to embodiment 2,3 coding methods.In cataloged procedure, when having the switching between ACELP and the TCX coding mode, corresponding decoding process comprises following step as shown in Figure 7:
Step 701: decoding end receives decoded bit stream, determines the decoding schema to the present frame employing, and adopts the decoding schema of determining to decode.
At this, decoding schema can be determined according to the zone bit that carries in the decoded bit stream.If present frame is adopted the ACELP coding, then need to adopt the ACELP mode decoding, if present frame is adopted the TCX pattern-coding, then need to adopt the TCX mode decoding.
Step 702: when present frame is adopted the TCX mode decoding, judge whether former frame adopts the ACELP mode decoding, if then execution in step 703, otherwise, execution in step 704.
Step 703: will adopt value that the TCX mode decoding obtains value, and forward step 705 to as present frame.
At this, present frame adopts the TCX pattern, and former frame adopts under the situation of ACELP pattern, does not have crossover region between two frames, therefore, can not do other and handle, thereby reduce the computation complexity of decoding.
Step 704: the value that adopts the TCX mode decoding to obtain is carried out overlap-and-add handle, obtain the value of present frame, forward step 705 to.
Step 705: to the value of resulting present frame, carry out subsequent decoding and handle, for example filtering obtains the signal of decoding and recovering.
Embodiment 7
Figure 8 shows that the structural drawing of decoding device in the present embodiment 7, this decoding device is applicable to the code device among the embodiment 4.As shown in Figure 8, decoding device comprises: decoding unit, decoding schema determining unit, processing unit, overlapping processing unit.Described decoding unit receives the decoded bit stream of present frame, according to the decoding schema of present frame present frame is decoded; Described decoding schema determining unit determines whether former frame is identical with the decoding schema that present frame adopts, and result inequality is sent to described processing unit, and identical result is sent to described overlapping processing unit; After described processing unit received decoding schema that described former frame and present frame adopt result inequality, the value that decoding obtains to present frame was as the value of present frame; After described overlapping processing unit received the identical result of decoding schema that described former frame and present frame adopt, the value that decoding obtains to the present frame processing that overlaps obtained the value of present frame.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a method of eliminating influence of encoding mode switch-over is characterized in that, this method comprises:
Receive present frame and determine in former frame different with the coding mode that present frame is adopted;
Obtain the system function of present frame, calculate the zero state response of this system function;
With the value of zero state response value, and the value of present frame encoded as present frame.
2. method according to claim 1 is characterized in that,
After the described calculating zero state response, further comprise: to the windowing of zero state response value;
With the zero state response value be: with the value of the zero state response value after the windowing as present frame as the value of present frame.
3. method according to claim 1 and 2 is characterized in that,
Described system function is: the product of composite filter and weight wave filter;
Described composite filter obtains by linear prediction analysis.
4. method according to claim 1 and 2 is characterized in that,
The zero state response of described this system function of calculating is: the system's output with former frame in system function is changed to zero, the response that the input signal of calculating present frame obtains by this system function.
5. method according to claim 1 and 2 is characterized in that,
Described calculating zero state response is: the zero state response of calculating limited sequence in the present frame sequence.
6. method according to claim 5 is characterized in that, describedly with the zero state response value as the value of present frame is: with the zero state response value of described limited the sequence value as corresponding limited sequence in the described present frame.
7. method according to claim 5 is characterized in that, limited sequence is in the described present frame sequence: preceding limited continuous sequence of present frame.
8. method according to claim 6 is characterized in that,
Before the zero state response of described this system function of calculating, further comprise: the input signal of present frame obtains weights signal by the weight wave filter;
Described zero state response value with limited sequence as the value of corresponding limited sequence in the described present frame is: the zero state response value that the weights signal of limited sequence in the present frame is updated to described limited sequence.
9. method according to claim 1 is characterized in that, the coding mode that described present frame adopts is the transform domain coding pattern, and the coding mode that described former frame adopts is an Algebraic Code Excited Linear Prediction ACELP pattern.
10. a device of eliminating influence of encoding mode switch-over is characterized in that, this device comprises: coding unit, and the coding mode determining unit, the zero state response computing unit is replaced the unit;
Described coding unit is used for present frame is encoded;
Described coding mode determining unit is used for determining whether former frame is identical with the coding mode that present frame adopts, and result inequality is sent to described zero state response computing unit;
Described zero state response computing unit calculates zero state response at present frame, and the zero state response value that calculates is sent to described replacement unit after being used to receive coding mode that described former frame and present frame adopt result inequality;
Described replacement unit is used to receive the input signal of present frame, and uses the input signal of replacing present frame from the zero state response value of zero state response computing unit reception, and the input signal of the present frame after will replacing is given described coding unit.
11. device according to claim 10 is characterized in that, this device further comprises: add window unit;
The described window unit that adds is used to receive the zero state response value that described zero state response computing unit is exported, and to the windowing of zero state response value, the zero state response value after the windowing is exported to described replacement unit.
12., it is characterized in that this device further comprises: pretreatment unit according to claim 10 or 11 described devices;
Described pretreatment unit is used to receive the input signal of present frame, and input signal is carried out weight filtering, obtains weights signal, and passes to described replacement unit;
Described replacement unit is used for replacing weights signal with the zero state response value, and the weights signal after will replacing is given described coding unit.
13. a coding/decoding method that is applicable to the described coding method of claim 1 is characterized in that, this method comprises:
Receive the decoded bit stream of present frame, present frame is decoded according to the decoding schema of present frame;
Determine that former frame is different with the decoding schema that present frame is adopted;
The value that decoding obtains to present frame is as the value of present frame.
14. method according to claim 13 is characterized in that,
The decoding schema that described present frame adopts is the transform domain decoding schema, and the coding mode that described former frame adopts is the ACELP pattern.
15. a decoding device is characterized in that, this device comprises: decoding unit, decoding schema determining unit, processing unit;
Described decoding unit is used to receive the decoded bit stream of present frame, according to the decoding schema of present frame present frame is decoded;
Described decoding schema determining unit is used for determining whether former frame is identical with the decoding schema that present frame adopts, and result inequality is sent to described processing unit;
After described processing unit was used to receive decoding schema that described former frame and present frame adopt result inequality, the value that decoding obtains to present frame was as the value of present frame.
16. device according to claim 15 is characterized in that, this device further comprises: the overlapping processing unit;
Described decoding schema determining unit is used for the result that decoding schema is identical and sends to described overlapping processing unit;
After described overlapping processing unit was used to receive the identical result of decoding schema that described former frame and present frame adopt, the value that decoding obtains to the present frame processing that overlaps obtained the value of present frame.
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