TH73284B - Downmixing SBR Bit Stream Parameter (SBR Bitstream Parameter Downmix) parameters - Google Patents

Abstract

DC60 (03/05/55) The current document deals with audio decoding and / or audio transcoding. Current documents are relevant to the decoding scheme. It is effective for the M number of audio channels from the bistream containing the higher N number of audio channels. In this context, methods and systems For use to merge the first source set and the second source set of the spectral band replication (SBR) parameter into the target set of the SBR parameter is described. The first source and the second source contain the first frequency band partitioning and the second frequency band partition, respectively, which are different from each other. Where the first set contains the first set of energy-related values related to the frequency band of First frequency band block share The second source set contains a second set of values related to that energy. Related to the frequency band of the second frequency band share The goal set contains the associated values. The target energy associated with the elementary frequency band, the method consists of the phase of first-band separation and second-band partition. Into a joint grid consisting of fundamental frequency bands; The first configuration of the first batch Of the values associated with energy given to the fundamental frequency band; The second assignment of the second set of values that Relating to energy given to the fundamental frequency band; And combining the first and second values together so that It is a value related to the target power for the fundamental frequency band (Figure). Figure 3. The current document deals with audio decoding and / or audio transcoding. Current documents are relevant to the decoding scheme. It is effective for the M number of audio channels from the bistream containing the higher N number of audio channels. In this context, methods and systems For use to merge the first soure set and the second source set of the spectral band replication (SBR) parameter into the target set of the SBR parameter is described. The first source and the second source contain the first frequency band partitioning and the second frequency band partition, respectively, which are different from each other. Where the first set contains the first set of energy-related values related to the frequency band of First frequency band block share The second source set contains a second set of values related to that energy. Related to the frequency band of the second frequency band share The goal set contains the associated values. The target energy associated with the elementary frequency band, the method consists of the phase of first-band separation and second-band partition. Into a joint grid consisting of fundamental frequency bands; The first configuration of the first batch Of the values associated with energy given to the fundamental frequency band; The second assignment of the second set of values that Relating to energy given to the fundamental frequency band; And combining the first and second values together so that It is the value associated with the target power for the fundamental frequency band.

Claims (6)

Claims (all) which will not appear on the advertisement page :Edit 19 Dec 2019 No claim ---------------------------------------------------- ------------------------ Edit 7 Sept. 2017 1. How to merge the first source set and the second source set of parameters? The spectral band replication parameters, henceforth referred to as the SBR parameters, are the target sets of the SBR parameters, where - the first source and the second source set. It consists of the first frequency band partitioning and the second frequency band partitioning respectively, which are different from each other; - The first source set includes the first set of energy-related values associated with the band. the frequency of the first band segment divider; - The second source set includes the second set of energy-related values associated with the frequency band of the second frequency band divider; and - the target set contains the target energy-related values associated with the elementary frequeney band); Methods of assembly include: - splitting the first band and the second band segments into a joint grid consisting of the fundamental bands; - the first assignment of the first set of power-related values to the fundamental frequency band; - the second assignment of the second set of power-related values to the fundamental frequency band; and - the combination of the first and the second values to be values related to the target energy. for the fundamental frequency band ---------------------------------------------------- ---------------------------------------------------- 1. How to merge the first source set (201,512) and the second source set (202522) of spectral band replication parameters, which henceforth Called the SBR parameter, it is the target set (206, 532) of the SBR parameter, where - the first source set (201, 512) and the second source set (202, 522) contain bar separators. The first (frequency band partitioning) (513, 514) and the second (523, 524, 525) band partitioning, respectively, differ from each other; - The first source set (201, 512) contains the first set of power-related values (515, 516, 517) associated with the band (511) of the first band-share (513, 514); the second (202, 522) contains the second set of energy-related values (526, 527, 528, 529) associated with the frequency band of the second frequency segment divider (523, 524, 525); and - the target set (206, 532) contains target energy-related values (533) associated with the elementary frequeney band (543); Methods include: - Splitting the first band (513, 514) and second band (523, 524, 525) segments into a joint grid (541, 542) comprising the frequency bands. Fundamental (543); - the first assignment (517) of the first set of power-related values (515, 516, 517) to the fundamental frequency band (543); - the second assignment (529) of that set. Two of the energy-related values (526, 527, 528 529) are given to the fundamental frequency band (543); and - combining the first value (517) and the second value (529) to provide the target energy-related value (533) for the fundamental frequency band (543). 2. Claim Method 1, where - the first value (517) corresponds to the energy-related value associated with the band (511) of the first band segment (513, 514), comprising the fundamental band (543); and - the second value (529) corresponds to the energy-related value associated with the frequency band of The second band divider (523, 524, 525) comprising the fundamental band (543) 3. Method of one of the preceding claims, where - common grid (541, 542) It relates to the quadrature mirror filter bank, also called the QMF filter bank, used to define the SBR parameters; and - the fundamental frequency band (543) is the QMF subband (QMF subband). The target energy (533) is the norm by the number of Participating source set 5. Method of one of the preceding claims, where the target set (206, 532) contains a set of values related to the target energy (533); and by the way Further includes: - Repeating the configuration steps and aggregation steps for all fundamental frequency bands (543) of the common grid (541, 542), resulting in a set of values related to the target power (533). 6. Claim Method No. 5, where the target set (206, 532) consists of a partition The target band contains the target band already defined; and by how to assemble Also added: - Averaging a set of values related to the target energy (533) associated with the bar. fundamental frequency (543) within the target band; and - determination of the mean to be the value associated with the target energy of the target frequency band 7. Method of one of the preceding claims, where - the energy-related value is the scale value energy. (scale factor energies) and frequency bands are universal scale factor bands; and/or - Energy-related values are noise floor scale factor energies and frequency bands are noise floor scale factor bands. 8. Which claim method? One of the preceding claims, where - the first source set (201, 512) relates to the first low band signal of the first source channel; - The second source unit (202, 522) is related to the second low-band signal of the channel. second source; and - the target set (206, 532) relates to the target channel's low-band signal, the target channel (target channel) obtained by downmixing the time domain. The time-dormain downmixing of the first low-band signal and the second low-band signal 9. Claim method 8, where - target energy-related values (533) are related to the time interval. a) target of the target low frequency band signal; - The first set of energy-related values (515, 516, 517) is related to the first period of the first low-band signal, where the first interval overlaps the target interval; and - The summation procedure consists of: scaling the first value (517) according to the ratio defined by the length of the overlap of the first and target intervals, and the length of the target interval; and combining the first scaled value (517) and the second value (529) 1 0. Claim method 9, where - the first source set (201, 512) consists of a band divider. the third; - The first source set (201, 512) contains the third set of values related to that energy. relating to the frequency band of the third frequency band share; - The third set of energy-related values is associated with the third period of the signal band. the first low frequency, where the third interval overlaps the target interval; Further assembly methods include: - Segmentation of the third frequency band into a common grid (541, 542) comprising the bands. fundamental frequency (543); - the third assignment of the third set of power-related values to the fundamental frequency band (543); and where the summation procedure consists of: - scaling the third value according to the ratio determined by the length of the interval overlap. the third and the target interval, and the length of the target interval; and - merging the first scaled value (517), second value (529) and third scaled value 1 1. Claim Method 8, which includes: - batch scaling. The first of the energy-related values (515, 516, 517) with coefficients first downmix (downmix coefficient); and - the second series of scaling of energy-related values (526, 527, 528, 529) with coefficients. second downmix; where the first downmix coefficient and the second downmix coefficient are related to First source channel and second source channel, respectively 1 2. Claim 11 method, where before the scaling step Methods include - weighting the first downmix coefficient and the second downmix coefficient as well. energy compensation factor; where the power compensation value is related to The interaction of the first low frequency signal and the second low frequency signal during Time domain downmix 1 3. Claim method 12, where - the power compensation value is related to the power ratio of the low-band signal. The target and power of the first low-band signal and the second low-band signal are combined 1 4. The method of claim 13, where - N source channels are merged, where N (formula) 2, to M, the target channel is obtained, where M < N lap M (formula) 1; - the power compensation value f comp is determined by: f comp = (formula) - x in [chin(formula)n] is the signal. Low band time domain signal in source channel chin , c chin is the downmix coefficient for source channel chin , x dmx [chout(formula)n] is the low band time domain signal of the channel. Target chout , and n are the sample index of a sample set of signals within a signal frame in time domain 1. 5. Method of one of the preceding claims, where - the first source set ( 201, 512) contains the first start frequency (551); - the second source set (202, 522) contains the second starting frequency (552); - the first start frequency (551) and start frequency. The second (552) differs and relates to lower bounds of the first band divider (513, 514) and the second band divider (523, 524, 525), respectively; and where the method is supplemented with - comparison of the first initial frequency (551) and the second initial frequency (552); - selection of the higher or lower initial frequency of the first initial frequency (551); and The second default frequency (552) is the default frequency (553) of target set 1. 6. Claim method 15, where - the first source set (201, 512) contains the SBR sub-unit header (SBR element. header) first consisting of the first initial frequency (551); - the second source set (202, 522) consisting of the second SBR subunit header consisting of second initial frequency (552); By means of additional assembly: - Selection of the target set SBR subunit code sections (206, 532) on the basis of the first SBR subunit head and the second SBR subunit header based on the selected default frequency (553). of the target set (206, 532) 1 7. Claims 16 method, where - if the target set (206, 532) is a channel pair element and the source set (201, 512 , 202, 522) contains at least one dual-channel subunit. Then, the target set SBR subunit header (206, 532) is selected from one of the source sets (201, 512, 202, 522) that contains the subunit. dual channel; - If the target set (206, 532) is a dual-channel subunit and none of the source sets (201, 512, 202, 522) are dual-channel subunits, then The source set SBR subunit header containing the highest or lowest initial frequency is selected as the basis for the target set SBR subunit header (206, 532); - if the target set (206, 532) is a target set SBR subunit header (206, 532); A single channel element (singel channel element) and at least one of the source sets (201, 512, 202, 522) is a single channel element. one channel already The target set SBR subunit header (206, 532) is selected as the SBR subunit header from one of the source sets consisting of single channel subunits; and/or - If the target set (206, 532) is a single-channel subunit and all source sets (201, 512, 202, 522) are dual-channel subunits, then The source set SBR subunit heading, containing the highest and lowest initial frequencies, is used as the basis for the target set SBR subunits (206, 532). Previously, where - the first source set (201) contains the first transient envelope index; where the first envelope transient index indicates the first transient envelope (414) in which the first start time border (417) resides; - The second source pack (202) contains the second transient Envelope Index; where the second envelope transient index indicates the second envelope transient (423) in which the second initial time region (426) resides; - Target Set (206) contains more than one target envelope, each target envelope has a default time limit; - First Envelope Transiant (414), Second Envelope Transiant (423) and Envelope Multiple targets are associated with one or more time periods of the first source signal. , the second source signal and the target signal, respectively; Additional methods include: - selection of the first preceding time region (426) from the first initial time region (417) and second initial time region (426); - determination of the envelope trans. Target Envelope from Target Envelope More than one with the start time region closest to the predecessor (426) of the first start time region (417) and second start time region (426); AND - Setting the target envelope transient index to identify the target envelope transient 1 9. How to merge the first source set (201, 512) and the second source set (202, 522). of the SBR parameter to the target set (206, 532) of the SBR parameter, where - the first source set (201, 512) contains the second start frequency (552); - the second source set (202, 522) contains the start frequency. second initial (552); - the first initial frequency (551) and the second initial frequency (552) are different and related to The lower frequency region of the first high-band signal and the corresponding second high-band signal. with the first source set (201, 512) and the second source set (202, 522) of the SBR parameters, respectively; and where the method is supplemented with: - comparison of the first initial frequency (551) and second starting frequency (552); - selection of a higher or lower starting frequency of the initial frequency. The first (551) and the second initial frequencies (552) are the initial frequencies (553) of the target set (206, 532) 2 0. Claim method 19, where - the first source set (201, 512). ) contains the first SBR subunit header which contains First initial frequency (551); - The second source unit (202, 522) contains the second SBR subunit header, which contains second initial frequency (552); Where additional assembly methods include: - Selection of the target set SBR sub-headers (206, 532) on the basis of the first SBR-subunit header and the second SBR-subunit header corresponding to the selected default frequency. Set (553) of target set (206, 532) 2 1. How to merge the first source set (201, 512) and second source set (202, 522) of SBR parameters into target set (206, 532) of parameters. SBR, where - The first source set (201, 512) is related to the first low-band signal of the channel. The first source and contains the first set of scaled power (515, 516, 517); - the second source set (202, 522) is related to the second low-band signal of the channel. The second source and consists of the second set of scale value power (526, 527, 528, 528); - the target set (206, 532) associated with the target low-band signal of the channel. Target obtained by downmixing the time domain of the first low-band signal and the band signal. second low frequency; and - Target Set (206, 532) contains target set of scale value energy (533); where the method consists of: - weighting the first downmix coefficient and the second downmix coefficient by power compensation value; where the first downmix coefficient is related to the first source channel; where the second downmix coefficient is related to the second source channel; where the compensation Energy is related to the interaction of the first low frequency signal and the second low frequency signal. during time domain downmixing; - First scaling of scaling energy (515, 516, 517) with downmix coefficient. weighted first; - Second scaling of scale values (526, 527, 528, 529) with coefficient second weighted downmix; and - Determination of the target set of scaled-valued energy (533) from the first set of scaled-valued energy (515, 516, 517) and of the second set of scaled-valued energy (526, 527, 528, 529. ) 2 2. Claim 21 method, where energy compensation is related to the ratio of the energy of the target low-band signal and the energy of the first low-band signal and The second low-band signal combines 2. 3. How to merge the first source (201) and the second source (202) set of SBR parameters into a target set (206) of the SBR parameters, where - the first source set (201)? ) contains the first transient envelope index; where the first envelope transient index indicates the first envelope transient (414) in which the first initial time region (417) resides; - The second source pack (202) contains the second transient envelope index; where the second envelope transient index indicates the second envelope transient (423) in which the second initial time region (426) resides; - Target sets consist of more than one target envelope, where each envelope The target has a default time limit; - First Envelope Transiant (414), Second Envelope Transiant (423) and Envelope Multiple targets associated with one or more periods of the first source signal, signal. second source and target signal, respectively; Methods include: - selection of the preceding start time region from the first initial time region (417) and the second initial time region (426); - determination of the target envelope transient from the end. Target envelope velope More than one with the start time region closest to the predecessor (426) of the first start time region (417) and second start time region (426); and - setting the target envelope transient index to identify the target envelope transient 2 Envelope Transient targets from more than one target envelope Envelope have. The initial time region (426) is closest to the predecessor of the initial timezone (417) and the second initial time zone (426), but no later than the initial time zone (426). occur First of the first initial time limit and second starting time limit 2 5. Method of one of the preceding claims. where each source set of the SBR parameter corresponds to the SBR parameter associated with the channel of the HE-AAC bitstream (HE-AAC bitstream) 2. 6. The method of merging N source sets (201, 202, 203, 204, 205) of the SBR parameters give is M the target set (208, 209) of the SBR parameters, where - N is greater than 2; - M is less than N; Methods include: - Merging pairs of source sets (201, 202) to form intermediate sets. (intermediate set) (206); and - merging an intermediate (206) with a source (204) or another intermediate set. To provide a target set (208) 2 7. Claim 26 method, wherein the merge procedure is performed in accordance with the method of claiming. One of Claims 1 to 25 2 8. Methods of Claims 26 to 27, where the source set (201, 202) corresponds to Source channels with higher acoustic relevance are often merged. less than the source set corresponding to the source channel with lower audio correlation 2 9. The software program is adapted to run on the processor and to which algorithms do the claim? Article one of claims 1 to 28 when acting on computer equipment 3 0. storage medium comprising software programs that Modified to act on the processor and perform the algorithms of any claim. Clause One of Claims 1 to 28 When Acting on a Computer Device 3 1. A computer program product containing executable instructions for performing any of the procedures of claims 1 to 28 when performed on a computer 3. 2. SBR parameter merging unit (112) designed to provide M target sets (208, 209) of SBR parameters from N source sets (201, 202, 203, 204, 205) of parameters. SBR, where N > M (formula) 1, where the SBR parameter integration unit consists of a processor designed to perform the algorithms of one of the claims. Claims 1 to 28 3 3. Audio decoder designed to decode HE-AAC bit streams composed of N audio channels, where the audio decoder consists of - AAC audio decoders designed to accept encoded HE-AAC bit streams. and provide a separate SBR bit stream; - SBR audio decoder (112) pursuant to Claim 32 designed to provide M target sets (208, 209) of SBR parameters from N source sets (201, 202, 203, 204, 205) of SBR parameters. , where N > M (formula) 1 3 4. Claim 33 audio decoders, where AAC audio decoders are also designed to provide N time domain low band audio signals corresponding to N audio channels; and where the audio decoder is supplemented with: - a time domain downmix unit designed to provide M time-domain low-band signals from N time-domain low-band signals; and - SBR units designed to generate M high-band audio from M low-band audio and M target sets of SBR parameters; where the audio decoder is designed to provide an M audio signal consisting of M low band audio and M high band audio, respectively 3. 5. An audio transcoder designed to provide an HE-AAC bit stream comprising M audio channels from an HE-AAC bit stream comprising N audio channels, where N > M (formula ) 1, provided that the audio codec contains: - SBR parameter integration unit (112) according to claim 32 3 6. An electronic device designed to render M audio signals corresponding to M channels from an HE-AAC bit stream consisting of N audio channels, where N > M (formula) 1, where The electronic equipment includes: - audio rendering means designed to render the sound of M audio channels; - a receiver designed to receive encrypted HE-ACC bit streams; and - an audio decoder designed to provide M audio signals from HE-AAC bit streams pursuant to one of Claims 33 to 34.