WO2015078123A1 - 立体声相位参数的编码方法及装置 - Google Patents
立体声相位参数的编码方法及装置 Download PDFInfo
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- WO2015078123A1 WO2015078123A1 PCT/CN2014/074673 CN2014074673W WO2015078123A1 WO 2015078123 A1 WO2015078123 A1 WO 2015078123A1 CN 2014074673 W CN2014074673 W CN 2014074673W WO 2015078123 A1 WO2015078123 A1 WO 2015078123A1
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000009499 grossing Methods 0.000 claims description 100
- 238000004364 calculation method Methods 0.000 claims description 9
- 101150097026 facA gene Proteins 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 14
- 238000013139 quantization Methods 0.000 description 12
- 230000005236 sound signal Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 210000005069 ears Anatomy 0.000 description 3
- 101100073493 Rattus norvegicus Kcnn4 gene Proteins 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/022—Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring
- G10L19/025—Detection of transients or attacks for time/frequency resolution switching
Definitions
- the present invention relates to the field of information technology, and in particular, to a method and apparatus for encoding stereo phase parameters.
- stereo audio has the sense of orientation and distribution of each sound source, which can improve the clarity of audio information, so stereo audio can better meet people's demand for audio effects.
- Global parameters include G-ITD (Global Inter-Channel Time Difference) and G-IPD (Global Inter-Channel Phase Difference).
- the extracted G-ITD and G-IPD have low accuracy, and the original stereo phase information cannot be restored according to G-ITD and G-IPD, resulting in poor stereo audio information. .
- Embodiments of the present invention provide a coding method and apparatus for a stereo phase parameter, which can improve the effect of stereo audio information.
- an embodiment of the present invention provides a method for encoding a stereo phase parameter, including: acquiring a stereo global phase parameter of a current frame;
- the value of the stereo global phase parameter of the adjusted current frame is encoded.
- the adjusting the value of the stereo global phase parameter of the current frame according to the determining result of the value of the stereo global phase parameter of the current frame includes:
- the value of the stereo global phase parameter of the current frame is adjusted according to the determination result of the value of the stereo global phase parameter of the current frame and the absolute value mean of the inter-channel time difference of each subband of the current frame.
- the determination result of the value of the stereo global phase parameter and the absolute value mean of the inter-channel time difference of each sub-band of the current frame, before adjusting the value of the stereo global phase parameter of the current frame further includes: sliding processing, Obtaining an absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame;
- Adjusting the value of the stereo global phase parameter of the current frame according to the determination result of the value of the stereo global phase parameter of the current frame and the absolute value mean of the inter-channel time difference of each subband of the current frame Specifically include:
- a value of a stereo global phase parameter of the current frame according to a determination result of a value of a stereo global phase parameter of the current frame and an absolute value mean value of a smoothed inter-channel time difference of each subband of the current frame Make adjustments.
- the stereo global phase parameter includes a group delay G- ITD parameters
- the determination result of the value of the stereo global phase parameter according to the current frame and the Determining an absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame, and adjusting the value of the stereo global phase parameter of the current frame includes:
- the absolute value of the inter-channel time difference after smoothing according to each sub-band of the current frame is obtained.
- the mean value is adjusted for the value of the G-ITD parameter of the current frame.
- the value of the G_ITD parameter of the current frame is adjusted according to the absolute value mean of the smoothed inter-channel time difference of each sub-band of the current frame:
- the stereo global phase parameter includes a group delay G-ITD parameter and a group phase G-IPD parameter;
- the stereo global phase parameter of the current frame according to the determination result of the value of the stereo global phase parameter of the current frame and the absolute value mean of the smoothed inter-channel time difference of each subband of the current frame
- the values are adjusted to include:
- the smoothed inter-channel time according to each sub-band of the current frame is obtained.
- the absolute value of the difference is adjusted to adjust the value of the G-IPD parameter of the current frame.
- the determining result of the value of the stereo global phase parameter of the current frame is When the value of the G_ITD parameter is 0, and the value of the G-IPD parameter of the current frame is not 0, the absolute value of the inter-channel time difference after smoothing according to each sub-band of the current frame is And adjusting the value of the G-IPD parameter of the current frame specifically includes:
- the stereo global phase parameter of the current frame The result of the determination is that the value of the G-ITD parameter is 0, and the value of the G-IPD parameter of the current frame is 0, the smoothed channel according to each sub-band of the current frame
- the mean value of the absolute value of the time difference, and adjusting the value of the G-IPD parameter of the current frame specifically includes:
- the obtaining, obtaining an absolute value mean value of the inter-channel time difference after smoothing of each sub-band of the current frame includes:
- an embodiment of the present invention provides an apparatus for encoding a stereo phase parameter, including: an acquiring unit, configured to acquire a stereo global phase parameter of a current frame; a determining unit, configured to determine a value of a stereo global phase parameter of the current frame acquired by the acquiring unit;
- an adjusting unit configured to adjust a value of a stereo global phase parameter of the current frame according to a determination result of a value of a stereo global phase parameter of the current frame determined by the determining unit;
- a coding unit configured to encode a value of a stereo global phase parameter of the current frame adjusted by the adjustment unit.
- the adjusting unit includes:
- An acquiring module configured to acquire an inter-channel time difference of each sub-band of the current frame, and a calculation module, configured to calculate the current time according to an inter-channel time difference of each sub-band of the current frame acquired by the acquiring module An absolute value mean of the inter-channel time difference of each sub-band of the frame; an adjustment module, configured to determine a result of the value of the stereo global phase parameter of the current frame, and each sub-band of the current frame calculated by the calculation module The absolute value of the inter-channel time difference is averaged, and the value of the stereo global phase parameter of the current frame is adjusted.
- the adjusting unit further includes:
- a processing module configured to perform inter-frame smoothing processing on an absolute value mean value of inter-channel time differences of each sub-band of the current frame calculated by the calculation module;
- the obtaining module is further configured to obtain an absolute value of an absolute value of an inter-channel time difference after the smooth processing of the processing module of each sub-band of the current frame;
- the adjusting module is further configured to: determine, according to a determination result of a value of a stereo global phase parameter of the current frame, and an absolute value of a smoothed inter-channel time difference of each subband of the current frame acquired by the acquiring module The mean value is adjusted for the value of the stereo global phase parameter of the current frame.
- the stereo global phase parameter acquired by the acquiring unit includes a group delay G-ITD parameter Number
- the adjusting module is further configured to: when the determining result of the value of the stereo global phase parameter of the current frame is that the value of the G_ITD parameter is not 0, according to each of the current frames acquired by the acquiring module The absolute value of the inter-channel time difference after the smoothing of the sub-bands is adjusted, and the value of the G-ITD parameter of the current frame is adjusted.
- the adjustment module is further used to calculate the G- of the current frame according to the formula
- / ⁇ 1
- the absolute value of the value of the ITD parameter is adjusted, where, for the absolute value of the value of the adjusted G-ITD parameter,
- _ is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame
- /acl and / ac2 are smoothing factors
- /acl > 0 , facl > 0 , /acl + /ac2 l .
- the stereo global phase parameter acquired by the acquiring unit includes a group delay G-ITD parameter and a group phase G-I P D parameter;
- the adjusting module is further configured to: when the determining result of the value of the stereo global phase parameter of the current frame is that the value of the G_ITD parameter is 0, according to each sub of the current frame acquired by the acquiring module The mean value of the absolute value of the inter-channel time difference after the smoothing of the band is adjusted, and the value of the G-IPD parameter of the current frame is adjusted.
- the adjusting module is further configured to: when the value of the stereo global phase parameter of the current frame is determined, the value of the G_ITD parameter is 0, and the value of the G-IPD parameter of the current frame is not 0.
- / ⁇ 3
- + / ⁇ 4 / ⁇ ⁇ _ fine adjust the absolute value of the value of the G - IPD parameter,
- the adjusting unit further includes:
- a configuration module configured to: when the value of the value of the stereo global phase parameter of the current frame is 0, and the value of the G-ITD parameter of the current frame is 0, The absolute difference between the inter-channel phase differences after the smoothing of the processing module of each sub-band of the current frame The value average is used as the absolute value of the G-IPD parameter of the current frame, and the symbol of the G-IPD parameter of the previous frame of the current frame is used as the symbol of the G-IPD parameter of the current frame.
- the method and apparatus for encoding a stereo phase parameter provided by an embodiment of the present invention first acquires a stereo global phase parameter of a current frame, and then determines a value of a stereo global phase parameter of the current frame, and determines a value of a stereo global phase parameter of the current frame. As a result, the value of the stereo global phase parameter of the current frame is adjusted, and finally the value of the adjusted stereo global phase parameter of the current frame is encoded.
- the stereo phase information is restored by the adjusted Global parameter, and the accuracy of the stereo phase information can be improved, so that the effect of the stereo audio information can be improved.
- FIG. 1 is a flowchart of a method for encoding a stereo phase parameter according to an embodiment of the present invention
- FIG. 2 is a flow chart of another method for encoding a stereo phase parameter according to an embodiment of the present invention
- FIG. 3 is a flowchart of still another encoding method of a stereo phase parameter according to an embodiment of the present invention.
- FIG. 4 is a flow chart of another encoding method of a stereo phase parameter according to an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of an apparatus for encoding a stereo phase parameter according to an embodiment of the present invention.
- FIG. 6 is a schematic structural diagram of a server according to an embodiment of the present disclosure.
- FIG. 7 is a schematic structural diagram of another apparatus for encoding a stereo phase parameter according to an embodiment of the present disclosure.
- FIG. 8 is a schematic structural diagram of another server according to an embodiment of the present invention.
- An embodiment of the present invention provides a method for encoding a stereo phase parameter. As shown in FIG. 1, the method includes: 101.
- the server acquires a stereo global phase parameter of the current frame.
- the stereo global phase parameters include group delay G-ITD and group phase G-IPD.
- group delay G_ITD represents the time delay between the left and right channels of the stereo
- the measurement unit is the sample point.
- Group Phase G—IPD indicates the waveform similarity of the left and right channels of the stereo after time alignment.
- the unit of measurement is radians, and the range of values is (- ⁇ , ⁇ ].
- the server determines a value of a stereo global phase parameter of the current frame.
- the determining result of the value of the stereo global phase parameter of the current frame includes: the value of the G_ITD parameter of the current frame is not 0, the value of the G_ITD parameter of the current frame is 0, and the value of the G-IPD parameter of the current frame Not 0, the value of the G-ITD parameter of the current frame is 0 and the value of the G-IPD parameter of the current frame is 0.
- the server adjusts a value of a stereo global phase parameter of the current frame according to a determination result of a value of a stereo global phase parameter of the current frame.
- the server when the accuracy of the extracted stereo global phase parameters G_ITD and G_I P D of the current frame is low, the server cannot restore the original stereo phase information according to the stereo phase parameter, so that the stereo audio signal cannot be recovered.
- the server by adjusting the G-ITD or the G-IPD, the server can avoid the situation that the stereo phase information is restored according to the G-ITD and the G-IPD which are largely different from the original stereo phase parameters. Improve the effect of stereo audio information.
- the server encodes the value of the adjusted stereo global phase parameter of the current frame.
- the server can encode the value of the stereo global phase parameter of the adjusted current frame by using a 5 bit (bit) quantization coding method.
- the first bit is the stereo phase parameter flag bit flag, and the second to fifth bits are adjusted.
- the encoding method of the stereo phase parameter provided by the embodiment of the present invention first obtains the stereo global phase parameter of the current frame, and then determines the value of the stereo global phase parameter of the current frame, and according to the determination result of the value of the stereo global phase parameter of the current frame, Stereo global for the current frame.
- Stereo global for the current frame The value of the phase parameter is adjusted, and finally the value of the adjusted stereo global phase parameter of the current frame is encoded.
- the stereo phase information is restored by the adjusted Global parameter, and the accuracy of the stereo phase information can be improved, so that the effect of the stereo audio information can be improved.
- An embodiment of the present invention provides another method for encoding a stereo phase parameter. As shown in FIG. 2, the method includes:
- the server acquires a stereo global phase parameter of the current frame.
- the stereo global phase parameters include group delay G-ITD and group phase G-IPD.
- group delay G_ITD represents the time delay between the left and right channels of the stereo
- the measurement unit is the sample point.
- Group Phase G—IPD indicates the waveform similarity of the left and right channels of the stereo after time alignment.
- the unit of measurement is radians, and the range of values is (- ⁇ , ⁇ ].
- the server determines a value of a stereo global phase parameter of the current frame.
- the determining result of the value of the stereo global phase parameter of the current frame includes: the value of the G_ITD parameter of the current frame is not 0, the value of the G_ITD parameter of the current frame is 0, and the value of the G-IPD parameter of the current frame Not 0, the value of the G-ITD parameter of the current frame is 0 and the value of the G-IPD parameter of the current frame is 0.
- the server acquires an inter-channel time difference of each sub-band of the current frame.
- the sub-bands of the current frame may be divided in advance by the server.
- the server can divide the frequency band into 12 sub-bands, each of which has a corresponding inter-channel time difference.
- the time difference between channels is used to indicate the time difference between the sound reaching the left and right ears respectively.
- the ITD can be represented by a sample point.
- the time interval of ITD is (-5ms, 5ms), and the unit of measurement is ms (millisecond, millisecond). After the server samples the bandwidth of 16kHz, the corresponding sample interval is (-80, 80), and the unit of measurement is sample. point.
- the server calculates a current frame according to an inter-channel time difference of each sub-band of the current frame.
- the server can calculate according to the formula / ⁇ )
- /rz>(b) is the inter-channel time difference of the b-th sub-band
- b is an integer greater than or equal to 1 and less than or equal to L
- L is the total number of sub-bands .
- the inter-frame smoothing process acquires the absolute value of the absolute value of the inter-channel time difference after smoothing of each sub-band of the current frame.
- the inter-frame smoothing process acquires the absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame.
- / ⁇ ) _ ⁇ is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame
- ITD smik - V is the smoothed processing of each sub-band of the previous frame of the current frame
- the server smoothes the adjacent data frames of the current frame, so that the stereo audio signal corresponding to the adjacent data frame of the current frame may be abruptly changed, and the stereo audio signal may be abruptly changed. Improve stereo audio.
- step 206a is performed, and the server performs the smoothed inter-channel time difference according to each sub-band of the current frame.
- the absolute value is averaged to adjust the value of the G-ITD parameter of the current frame.
- the absolute value of the value of the G-ITD parameter after the adjustment is the absolute value of the value of the G-ITD parameter
- / ⁇ )_ ⁇ is the absolute time difference between the smoothed channels of each sub-band of the current frame.
- step 206b is executed, and the server according to the formula
- C 3x
- step 206c is performed, and the server will each of the current frame.
- the absolute value of the inter-channel phase difference after the smoothing of the sub-band is taken as the absolute value of the G-IPD parameter of the current frame
- the symbol of the G-IPD parameter of the previous frame of the current frame is taken as the G-IPD parameter of the current frame. symbol.
- the server can calculate according to the formula: 1 ⁇ ⁇ > -
- FFr_JEN is the transform length, which is the frequency value, which is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame, and the IPD is the smoothing of each sub-band of the current frame.
- the server encodes a value of the adjusted stereo global phase parameter of the current frame.
- the server can encode the value of the stereo global phase parameter of the adjusted current frame by using a 5 bit (bit) quantization coding method.
- the first bit is the stereo phase parameter flag bit flag, and the second to fifth bits are adjusted.
- the encoding method of the stereo phase parameter provided by the embodiment of the present invention first obtains the stereo global phase parameter of the current frame, and then determines the value of the stereo global phase parameter of the current frame, and according to the determination result of the value of the stereo global phase parameter of the current frame, The value of the stereo global phase parameter of the current frame is adjusted, and finally the value of the adjusted stereo global phase parameter of the current frame is encoded.
- the embodiment of the present invention can restore the stereo phase information through the adjusted Global parameter, thereby improving the accuracy of the stereo phase information, thereby improving the effect of the stereo audio information.
- the embodiment of the present invention provides another method for encoding a stereo phase parameter, which is suitable for adjusting a case where the G-ITD parameter and the G-IPD parameter of the current frame are both 0.
- the method includes :
- the server acquires a stereo global phase parameter of the current frame.
- the stereo global phase parameters include group delay G-ITD and group phase G-IPD.
- group delay G_ITD represents the time delay between the left and right channels of the stereo
- the measurement unit is the sample point.
- Group Phase G—IPD indicates the waveform similarity of the left and right channels of the stereo after time alignment.
- the unit of measurement is radians, and the range of values is (- ⁇ , ⁇ ].
- the server determines a value of a stereo global phase parameter of the current frame.
- the determining result of the value of the stereo global phase parameter of the current frame includes: the value of the G_ITD parameter of the current frame is not 0, the value of the G_ITD parameter of the current frame is 0, and the value of the G-IPD parameter of the current frame Not 0, the value of the G-ITD parameter of the current frame is 0 and the value of the G-IPD parameter of the current frame is 0. 303.
- the server acquires an inter-channel time difference of each sub-band of the current frame.
- the sub-bands of the current frame may be divided in advance by the server.
- the server can divide the frequency band into 12 sub-bands, each of which has a corresponding inter-channel time difference.
- the time difference between channels is used to indicate the time difference between the sound reaching the left and right ears respectively.
- the ITD can be represented by a sample point.
- the time interval of ITD is (-5ms, 5ms), and the unit of measurement is ms (millisecond, millisecond). After the server samples the bandwidth of 16kHz, the corresponding sample interval is (-80, 80), and the unit of measurement is sample. point.
- the server calculates an absolute value of the absolute value of the inter-channel time difference of each sub-band of the current frame according to the inter-channel time difference of each sub-band of the current frame.
- the inter-frame smoothing process acquires the absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame.
- the inter-frame smoothing process acquires the absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame.
- / ⁇ ) _ ⁇ is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame
- ITD smik - V is the smoothed processing of each sub-band of the previous frame of the current frame
- the server smoothes the adjacent data frames of the current frame, so that the stereo audio signal corresponding to the adjacent data frame of the current frame may be abruptly changed, and the stereo audio signal may be abruptly changed. Improve stereo audio.
- the server will each sub-band of the current frame.
- the absolute value of the inter-channel phase difference after smoothing is taken as the absolute value of the G-IPD parameter of the current frame, and the symbol of the G-IPD parameter of the previous frame of the current frame is used as the symbol of the G-IPD parameter of the current frame.
- the server can calculate according to the formula: 1 ⁇ ⁇ ⁇ > -
- FFr_JEN is the transform length, which is the frequency point value, which is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame
- IPD _ is the smoothed inter-channel phase difference of each sub-band of the current frame. The absolute value of the mean.
- the server encodes the value of the adjusted stereo global phase parameter of the current frame.
- the server can encode the value of the stereo global phase parameter of the adjusted current frame by using a 5 bit (bit) quantization coding method.
- the first bit is the stereo phase parameter flag bit flag, and the second to fifth bits are adjusted.
- the encoding method of the stereo phase parameter provided by the embodiment of the present invention first obtains the stereo global phase parameter of the current frame, and then determines the value of the stereo global phase parameter of the current frame, and according to the determination result of the value of the stereo global phase parameter of the current frame, The value of the stereo global phase parameter of the current frame is adjusted, and finally the value of the adjusted stereo global phase parameter of the current frame is encoded.
- the embodiment of the present invention can restore the stereo phase information through the adjusted Global parameter.
- the accuracy of the body sound phase information can improve the effect of stereo audio information.
- An embodiment of the present invention provides a coding method for a stereo phase parameter, which is adapted to adjust a case where the G-ITD parameter and the G-IPD parameter of the current frame are not all 0, as shown in FIG. include:
- the server acquires a stereo global phase parameter of the current frame.
- the stereo global phase parameters include group delay G-ITD and group phase G-IPD.
- group delay G_ITD represents the time delay between the left and right channels of the stereo
- the measurement unit is the sample point.
- Group Phase G—IPD indicates the waveform similarity of the left and right channels of the stereo after time alignment.
- the unit of measurement is radians, and the range of values is (- ⁇ , ⁇ ].
- the server determines a value of a stereo global phase parameter of the current frame.
- the determining result of the value of the stereo global phase parameter of the current frame includes: the value of the G_ITD parameter of the current frame is not 0, the value of the G_ITD parameter of the current frame is 0, and the value of the G-IPD parameter of the current frame Not 0, the value of the G-ITD parameter of the current frame is 0 and the value of the G-IPD parameter of the current frame is 0.
- the server acquires an inter-channel time difference of each sub-band of the current frame.
- the sub-bands of the current frame may be divided in advance by the server.
- the server can divide the frequency band into 12 sub-bands, each of which has a corresponding inter-channel time difference.
- the time difference between channels is used to indicate the time difference between the sound reaching the left and right ears respectively.
- the ITD can be represented by a sample point.
- the time interval of ITD is (-5ms, 5ms), and the unit of measurement is ms (millisecond, millisecond). After the server samples the bandwidth of 16kHz, the corresponding sample interval is (-80, 80), and the unit of measurement is sample. point.
- the server calculates an absolute value of the absolute value of the inter-channel time difference of each sub-band of the current frame according to the inter-channel time difference of each sub-band of the current frame.
- the server can calculate according to the formula / ⁇ )
- the absolute value is average, /rz>(b) is the inter-channel time difference of the b-th sub-band, b is an integer greater than or equal to 1 and less than or equal to L, and L is the total number of sub-bands.
- the inter-frame smoothing process acquires the absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame.
- the inter-frame smoothing process acquires the absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame.
- / ⁇ ) _ ⁇ ) is the mean of the absolute value of inter-channel time difference after smoothing processing for each sub-band of the current frame, ITD_ S m (k _ V ) of the previous frame of the current frame of each subband smooth
- the server smoothes the adjacent data frames of the current frame, so that the stereo audio signal corresponding to the adjacent data frame of the current frame may be abruptly changed, and the stereo audio signal may be abruptly changed. Improve stereo audio.
- step 406a is performed by the server according to the smoothed inter-channel time difference of each sub-band of the current frame.
- the absolute value is averaged to adjust the value of the G-ITD parameter of the current frame.
- the absolute value of the value of the G-ITD parameter after adjustment is the absolute value of the value of the G-ITD parameter
- / ⁇ )_ ⁇ is the smoothed processing of each sub-band of the current frame
- step 406b is executed, and the server according to the formula
- C 3x
- the server encodes a value of the adjusted stereo global phase parameter of the current frame.
- the server can encode the value of the stereo global phase parameter of the adjusted current frame by using a 5 bit (bit) quantization coding method, the first bit is the stereo phase parameter flag bit flag, and the second to fifth bits are adjusted.
- the encoding method of the stereo phase parameter provided by the embodiment of the present invention first obtains the stereo global phase parameter of the current frame, and then determines the value of the stereo global phase parameter of the current frame, and according to the determination result of the value of the stereo global phase parameter of the current frame, The value of the stereo global phase parameter of the current frame is adjusted, and finally the value of the adjusted stereo global phase parameter of the current frame is encoded.
- the stereo phase information is restored by the adjusted Global parameter, and the accuracy of the stereo phase information can be improved, thereby improving the effect of the stereo audio information.
- An embodiment of the present invention provides an apparatus for encoding a stereo phase parameter.
- the entity of the apparatus may be a server, and the apparatus includes: an obtaining unit 51, a determining unit 52, an adjusting unit 53, and an encoding unit 54. .
- the obtaining unit 51 is configured to acquire a stereo global phase parameter of the current frame.
- the determining unit 52 is configured to determine a value of a stereo global phase parameter of the current frame acquired by the obtaining unit 51.
- the adjusting unit 53 is configured to adjust the value of the stereo global phase parameter of the current frame according to the determination result of the value of the stereo global phase parameter of the current frame determined by the determining unit 52.
- the encoding unit 54 is configured to encode the value of the stereo global phase parameter of the current frame adjusted by the adjusting unit 53.
- the entity of the encoding device of the stereo phase parameter may be a server.
- the server may include: a processor 61, an input device 62, an output device 63, a memory 64, and the input device 62.
- the output device 63 and the memory 64 are connected to the processor 61, respectively.
- the processor 61 is configured to acquire a stereo global phase parameter of the current frame.
- the processor 61 is further configured to determine a value of a stereo global phase parameter of the current frame.
- the processor 61 is further configured to adjust a value of a stereo global phase parameter of the current frame according to a determination result of a value of a stereo global phase parameter of the current frame.
- the processor 61 is further configured to encode the value of the adjusted stereo global phase parameter of the current frame.
- An embodiment of the present invention provides another apparatus for encoding a stereo phase parameter.
- the entity of the apparatus may be a server, and the apparatus includes: an obtaining unit 71, a determining unit 72, Adjustment unit 73, encoding unit 74.
- the obtaining unit 71 is configured to acquire a stereo global phase parameter of the current frame.
- the determining unit 72 is configured to determine a value of a stereo global phase parameter of the current frame acquired by the acquiring unit 71.
- the adjusting unit 73 is configured to adjust the value of the stereo global phase parameter of the current frame according to the determination result of the value of the stereo global phase parameter of the current frame determined by the determining unit 72.
- the encoding unit 74 is configured to encode the value of the stereo global phase parameter of the current frame adjusted by the adjusting unit 73.
- the adjusting unit 73 includes: an obtaining module 7301, a calculating module 7302, and an adjusting module 7303.
- the obtaining module 7301 is configured to obtain an inter-channel time difference of each sub-band of the current frame.
- the calculation module 7302 is configured to perform, according to the sound adjustment module 7303 of each sub-band of the current frame acquired by the acquisition module 7301, the determination result of the value of the stereo global phase parameter of the current frame and the respective sub-frames of the current frame calculated by the calculation module 7302 The absolute value of the time difference between the channels is adjusted to adjust the value of the stereo global phase parameter of the current frame.
- the adjustment unit 73 further includes: a processing module 7304.
- the processing module 7304 is configured to perform inter-frame smoothing processing on the absolute value mean value of the inter-channel time difference of each sub-band of the current frame calculated by the calculation module 7302.
- the obtaining module 7301 is further configured to obtain an absolute value mean value of the inter-channel time difference after the smooth processing of the processing module 7304 of each sub-band of the current frame.
- the adjusting module 7303 is further configured to: according to the determination result of the value of the stereo global phase parameter of the current frame and the absolute value mean value of the smoothed inter-channel time difference of each subband of the current frame acquired by the acquiring module 7301, for the current frame The value of the stereo global phase parameter is adjusted.
- the stereo global phase parameter acquired by the acquisition unit 71 includes a group delay G-ITD parameter.
- the adjusting module 7303 is further configured to: when the determined result of the value of the stereo global phase parameter of the current frame is that the value of the G_ITD parameter is not 0, the smoothed sound of each subband of the current frame acquired according to the obtaining module 7301 The absolute value of the time difference between the channels, the G-ITD parameter of the current frame The value is adjusted.
- the adjustment module 7303 is also used to calculate the value of the G-ITD parameter of the current frame according to the formula
- / ⁇ 1
- the absolute value of the value of the G-ITD parameter after adjustment is the absolute value of the value of the G-ITD parameter
- ITD_ is the absolute value of the absolute value of the inter-channel time difference after smoothing of each sub-band of the current frame
- /acl and / ac2 are smoothing factors
- / acl>0, facl > 0 , fad + facl 1.
- the stereo global phase parameters acquired by the acquisition unit 71 include group delay G_ITD parameters and group phase G-IPD parameters.
- the adjusting module 7303 is further configured to: when the determined result of the value of the stereo global phase parameter of the current frame is that the value of the G_ITD parameter is 0, the smoothed channel of each subband of the current frame acquired according to the obtaining module 7301 The absolute value of the time difference is adjusted to adjust the value of the G-IPD parameter of the current frame.
- the adjusting module 7303 is further configured to: when the value of the stereo global phase parameter of the current frame is determined to be 0, and the value of the G_ITD parameter is 0, and the value of the G-IPD parameter of the current frame is not 0, according to the formula
- _ IPD ⁇ fac x
- the absolute value of the value of the adjusted G-IPD parameter is the absolute value of the value of the G-IPD parameter
- IPD sm ⁇ K ITD - sm
- FFT JEN is the transform length, is the frequency value
- /TO is the absolute value mean value of the smoothed inter-channel time difference of each sub-band of the current frame
- IPD_sm is the absolute value mean value of the smoothed inter-channel phase difference of each sub-band of the current frame.
- the smoothing factor / ac 3 0.75 when the adjustment module 7303 is adjusted.
- the adjusting unit 73 further includes: a configuration module 7305.
- the configuration module 7305 is configured to: when the value of the stereo global phase parameter of the current frame is determined to be 0, and the value of the G-ITD parameter of the current frame is 0, the sub-bands of the current frame are
- the processing unit 7304 smoothes the absolute value of the inter-channel phase difference as the absolute value of the G-IPD parameter of the current frame, and uses the symbol of the G-IPD parameter of the previous frame of the current frame as the G-IPD of the current frame. The symbol of the parameter.
- ITD_sm ⁇ is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame
- ⁇ _ - ⁇ is the smoothed channel of each sub-band of the previous frame of the current frame
- Processing module 7304 smoothing factor smoothing factor fac5 0.9844.
- the entity of the encoding device of the stereo phase parameter may be a server.
- the server may include: a processor 81, an input device 82, an output device 83, a memory 84, and the input device 82.
- Output device 83 and memory 84 are coupled to processor 81, respectively.
- the processor 81 is configured to acquire a stereo global phase parameter of the current frame.
- the processor 81 is further configured to determine a value of a stereo global phase parameter of the current frame.
- the processor 81 is further configured to adjust a value of a stereo global phase parameter of the current frame according to a determination result of a value of a stereo global phase parameter of the current frame.
- the processor 81 is further configured to encode the value of the adjusted stereo global phase parameter of the current frame.
- the processor 81 is further configured to acquire an inter-channel time difference of each sub-band of the current frame.
- the processor 81 is further configured to calculate a current processor 81 according to an inter-channel time difference of each sub-band of the current frame, and further configured to determine a value according to a value of a stereo global phase parameter of the current frame. The value of the global phase parameter is adjusted.
- the processor 81 is further configured to perform inter-frame smoothing processing on the absolute value mean of the inter-channel time differences of the respective sub-bands of the current frame.
- the processor 81 is further configured to obtain an average value of the absolute values of the smoothed inter-channel time differences of the respective sub-bands of the current frame.
- the processor 81 is further configured to: according to the determination result of the value of the stereo global phase parameter of the current frame and the absolute value mean value of the smoothed inter-channel time difference of each subband of the current frame, the stereo global phase parameter of the current frame The value is adjusted.
- the stereo global phase parameters acquired by processor 81 include the group delay G-ITD parameters.
- the processor 81 is further configured to: when the value of the stereo global phase parameter of the current frame is determined to be that the value of the G_ITD parameter is not 0, the absolute time difference between the channels after the smoothing of each subband of the current frame is The value is averaged to adjust the value of the G-ITD parameter of the current frame.
- the processor 81 is also used to determine the absolute value of the G-ITD parameter of the current frame according to the formula
- / ⁇ 1 ⁇
- the absolute value of the value of the G-ITD parameter after adjustment is the absolute value of the value of the G-ITD parameter
- ITD_ is the absolute value of the absolute value of the inter-channel time difference after smoothing of each sub-band of the current frame
- /acl and / ac2 are smoothing factors
- / acl > 0 , facl > 0 , fad + facl 1.
- the stereo global phase parameters acquired by processor 81 include group delay G-ITD parameters and group phase G-IPD parameters.
- the processor 81 is further configured to: when the determined result of the value of the stereo global phase parameter of the current frame is that the value of the G_ITD parameter is 0, the absolute value of the inter-channel time difference after the smoothing of each sub-band of the current frame is used. Mean, adjusts the value of the G-IPD parameter of the current frame.
- the processor 81 is further configured to: when the value of the stereo global phase parameter of the current frame is determined to be 0, and the value of the G_ITD parameter is 0, and the value of the G-IPD parameter of the current frame is not 0, according to the formula
- _ IPD ⁇ fac x
- the absolute value of the value of the adjusted G-IPD parameter is the absolute value of the value of the G-IPD parameter
- IPD sm ⁇ K ITD - sm
- FFT JEN is the transform length, is the frequency value
- /TO is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame
- IPD_sm is the absolute value of the smoothed inter-channel phase difference of each sub-band of the current frame.
- the processor 81 is further configured to: when the value of the stereo global phase parameter of the current frame is determined to be 0, and the value of the G_ITD parameter of the current frame is 0, the respective sub-frames of the current frame are The absolute value of the inter-channel phase difference after smoothing is taken as the absolute value of the G-IPD parameter of the current frame, and the symbol of the G-IPD parameter of the previous frame of the current frame is taken as the G-IPD parameter of the current frame. symbol.
- ITD_sm ⁇ is the absolute value of the smoothed inter-channel time difference of each sub-band of the current frame
- ⁇ _ - ⁇ is the smoothed channel of each sub-band of the previous frame of the current frame
- the smoothing factor of processor 81 smoothing processing / ac5 0.9844. It should be noted that other corresponding descriptions of the functional units in the stereo phase parameter adjustment apparatus provided in the embodiment of the present invention may be referred to the corresponding description in FIG. 2, and details are not described herein again.
- the apparatus for encoding the stereo phase parameters provided by the embodiment of the present invention may implement the foregoing method embodiments.
- the encoding method and apparatus for stereo phase parameters provided by the embodiments of the present invention may be applied to recover stereo phase information, but are not limited thereto.
- a person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included.
- the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
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EP14866259.6A EP3057095B1 (en) | 2013-11-29 | 2014-04-02 | Method and device for encoding stereo phase parameter |
JP2016534977A JP6335301B2 (ja) | 2013-11-29 | 2014-04-02 | ステレオ位相パラメータを符号化する方法及び装置 |
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CN107358961B (zh) * | 2016-05-10 | 2021-09-17 | 华为技术有限公司 | 多声道信号的编码方法和编码器 |
CN107452387B (zh) * | 2016-05-31 | 2019-11-12 | 华为技术有限公司 | 一种声道间相位差参数的提取方法及装置 |
US10217467B2 (en) | 2016-06-20 | 2019-02-26 | Qualcomm Incorporated | Encoding and decoding of interchannel phase differences between audio signals |
CN107731238B (zh) | 2016-08-10 | 2021-07-16 | 华为技术有限公司 | 多声道信号的编码方法和编码器 |
US10217468B2 (en) * | 2017-01-19 | 2019-02-26 | Qualcomm Incorporated | Coding of multiple audio signals |
US10366695B2 (en) | 2017-01-19 | 2019-07-30 | Qualcomm Incorporated | Inter-channel phase difference parameter modification |
CN108877815B (zh) * | 2017-05-16 | 2021-02-23 | 华为技术有限公司 | 一种立体声信号处理方法及装置 |
CN109215668B (zh) * | 2017-06-30 | 2021-01-05 | 华为技术有限公司 | 一种声道间相位差参数的编码方法及装置 |
CN109300480B (zh) | 2017-07-25 | 2020-10-16 | 华为技术有限公司 | 立体声信号的编解码方法和编解码装置 |
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