TH124045A - 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)

Disclaimer (all) which will not appear on the advertisement page: Revised 19 Dec 2019 No disclaimer -------------------------------------------------- ------------------------ EDIT 7 Sep 2017 1. How to merge the first source set and the second source set of parameters. Spectral band replication parameters, hereinafter referred to as the SBR parameter, are the target set of SBR parameters, where - the first source and the second source. It consists of the first frequency band partitioning and the second frequency band partition respectively, which are different from each other; - The first source series includes the first set of energy-related values associated with the band. Frequency of the first frequency band barrier; - The second set of sources includes a second set of energy-related values. The frequency band of the second frequency band separator; And - The target set contains values associated with the target energy relative to the elementary frequeney band; Methods of assembly include: - First and second dividing into a joint grid consisting of a fundamental frequency band; - Initial assignment of the first set of values associated with power to the base frequency band; - second assignment of the second set of values related to power to the base frequency band; And - Combining the first and second values together to be 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 (202,522) of the spectral band replication parameters, from now on. The SBR parameter is referred to as the target set (206, 532) of the SBR parameter, where - the first source set (201, 512) and the second source set (202, 522) contains a bar share. The first frequency band partitioning (513, 514) and the second frequency band partitioning (523, 524, 525), respectively, differ from each other; - The first source series (201, 512) contains the first set of power-related values (515, 516, 517) related to the frequency band (511) of the first band share (513, 514); - source series. The second (202, 522) consists of a second set of energy-related values (526, 527, 528, 529) related to the frequency band of the second frequency band share (523, 524, 525); And - The target set (206, 532) contains values associated with the target energy (533) relative to the elementary frequeney band (543); Methods include: - First-band separation (513, 514) and second-band partition (523, 524, 525) into joint grid (541, 542) which consists of frequency band. Fundamental (543); - first assignment (517) of the first set of energy-related values (515, 516, 517) to the elementary frequency band (543); - second assignment (529) of the set. Two of the energy-related values (526, 527, 528 529) are given to the elementary frequency band (543); And - Combining the first (517) and the second (529) to be a value related to the target power (533) for the fundamental frequency band (543) 2. The method of claim 1, where - The initial value (517) corresponds to the energy-related value associated with the frequency band (511) of the first-band share (513, 514) consisting of the fundamental frequency band (543); And - the second value (529) corresponds to the energy-related value associated with the frequency band of Second-band share (523, 524, 525) which consists of the base frequency band (543) 3. Method of claim for any of the previous claims, where - Common Grid (541, 542) is related to a quadrature mirror filter bank filter, known as the QMF bank filter, used to define SBR parameters; And - The fundamental frequency band (543) is the QMF subband (QMF subband). 4. Method of claim for any of the preceding claims, which is supplemented by: Target energy (533) is the norm by a number of Participating source set 5. Method of one of the previous claim, where the target set (206, 532) consists of a set of values related to the target energy (533); And by the way It also consists of: - Repeating the configuration and aggregation procedures for all fundamental frequency bands (543) of the common grids (541, 542), which yields a set of values related to the target power (533). 6. Method of claim 5, where the target set (206, 532) consists of a share. A target frequency band that already contains a predefined target frequency band; And by the way of assembly Also: - Finding the average set of values associated with the target energy (533) in relation to the Fundamental frequencies (543) within the target frequency band; And - assigning the mean as a value related to the target energy of the target frequency band 7. Method of one of the previous claims, where - The value related to energy 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. How is the claim? One of the preceding claims, where - the first source (201, 512) relates to the first low band signal of the first source channel; - The second source series (202, 522) is related to the second low-band signal of the channel. Second source; And - The target set (206, 532) is related to the target low-band signal of the target channel obtained by downpacing the time domain. 9. Time-dormain downmixing of the first low-band signal and second low-band signal 9. Claim Method 8, where - the target energy-related value (533) is related to the time interval. A) the target of the target low 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 overlaps with the target period; And - The process of aggregation consists of: scaling the first value (517) according to the ratio determined by The length of the overlap of the first and the target period, and the length of the target period; And combining the first scaled value (517) and the second value (529) 1 0. Method of claim 9, where - the first source set (201, 512) contains the frequency-band share. The third; - The first source set (201, 512) contains the third set of values related to that energy. In relation 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 overlap with the target period; Additional methods are also included: - Breaking the third frequency band divider into a common grid (541, 542) containing the band. Elementary frequency (543); - Third assignment of the third set of energy-related values to the fundamental frequency band (543); And where the summation procedure consists of: - Scaling the third value at the ratio determined by the overlap length of the interval. The third and the target period, and the length of the target period; And - Combining the first scaled value (517), the second value (529) and the third scaled value 1 1. Method of claim 8, which is supplemented by: - Set scaling. The first of the energy-related values (515, 516, 517) with the coefficient The first downmix coefficient; And - second scaling of energy-related values (526, 527, 528, 529) with coefficients The second down mix; Where the first downmix coefficient and the second downmix coefficient are related to First upstream and second source, respectively 1. 2. Method of claim 11, where before the scaling procedure. The methods include - weighting the first downmix coefficient and the second downmix coefficient as well. Energy compensation factor; Where the value of energy compensation is related to Interaction of the first low band signal and the second low band signal during Downmix the time domain 1 3. The method of claim 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 combined 1 4. Method of claim 13, where - N source channels are merged, where N (formula) 2, to The target channel M is obtained, where M < N and M (formula) 1; - the energy compensation factor f comp is determined by: f comp = (formula) - x in [chin (formula) n] is The low band time domain signal in the chin, c chin source channel is the downmix coefficient for the chin, x dmx source channel. [Chout (formula) n] is the low band time domain signal of the channel. The target signal chout, and n is the sample index of the sample set within the signal frame in the time domain 1 5. Method of one of the preceding claims, where - the first source. (201, 512) contains the first start frequency (551); - the second source (202, 522) contains the second start frequency (552); - the first start frequency (551) and the beginning frequency. The second tree (552) is different and is related to Lower boundary of first-band share (513, 514) and second-band share (523, 524, 525), respectively; And where further assembly methods are also - comparison of the first initial frequency (551) and the second initial frequency (552); - selection of the higher or lower starting frequency of the first (551) and The second initial frequency (552) is the initial frequency (553) of the target set 1 6. The method of claim 15, where - The first source set (201, 512) contains the SBR subunit header (SBR element. first header) which contains the first initial frequency (551); - the second source set (202, 522) contains the second SBR subunit header which contains The second initial frequency (552); By way of additional assembly: - Selection of the target set SBR subunit (206, 532) based on the first SBR subunit header and the second SBR subunit header at the selected default frequency (553). Of the target set (206, 532) 1 7. The method of claim 16, where - if the target set (206, 532) is the channel pair element and the source (201, 512) The target set SBR subunit (206, 532) is selected from one of the source sets (201, 512, 202, 522) that contains the subunits. Dual-channel; - If the target set (206, 532) is a dual-channel subunit and no source (201, 512, 202, 522) is a dual-channel subunit. 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 subunit. A single channel (singel channel element) and at least one of the source series (201, 512, 202, 522) are subunits. Single 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 a single channel subunit; And / or - If the target set (206, 532) is a single-channel subunit and all the source sets (201, 512, 202, 522) are dual-channel subunits. The SBR subunit header of the source set containing the initial, maximum and minimum frequency 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 transport index indicates the first transient envelope (414) with the first start time border (417); - The second source set (202) contains the second envelope transport index; Where the second envelope transit index (423) with the second initial time boundary (426) is; - Target set (206) contains more than one target envelope, each target envelope has an initial time limit; - The first envelope (414), the second envelope (423) and more than one target envelope are related to one or more times of the first source signal. , The second source signal and the target signal, respectively; Additional methods are included: - Selection of the predecessor time boundary (426) from the first time boundary (417) and the second initial time boundary (426); - Determination of the envelope tran. Target from Envelope of Target Envelope. More than one number with the closest start time boundary (426) of the first start time region (417) and second default time region (426); And - Setting Target Envelop Transient Index to Identify Target Envelop Transport 1 9. First Source Set (201, 512) and Second Source Set (202, 522) Combination Method. Of the SBR parameter to be the target set (206, 532) of the SBR parameter, where - the first source set (201, 512) contains the second initial frequency (552); - the second source (202, 522) contains the initial frequency. The second beginning (552); - the first initial frequency (551) and the second initial frequency (552) are different and related to The lower frequency range 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 parameter, respectively; And where further assembly methods are also: - the comparison of the first initial frequency (551) and the second starting frequency (552); - the selection of the starting frequency higher or lower than the starting frequency. The first (551) and the second starting frequency (552) are the initial frequency (553) of the target set (206, 532) 2 0. Method of claim 19, where - the first source set (201, 512). ) Contains the first SBR subunit header which contains The first initial frequency (551); - the second source set (202, 522) contains a second SBR subunit header consisting of The second initial frequency (552); Where additional assembly methods are: - Selection of the target set SBR subunit header (206, 532) using 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 the second source set (202, 522) of the SBR parameter to the target set (206, 532) of the parameter. SBR, where - the first source set (201, 512) is associated with the first low-band signal of the channel. The first source and contains the first set of scale value energy (515, 516, 517); - the second source (202, 522) is associated with the second low band signal of the channel. The second source and contains the second set of energy, scale values (526, 527, 528, 528); - target series (206, 532) relates to the target low-band signal of the channel. The target obtained by downmixing the time domain of the first low band signal and the band signal. The second low frequency; And - target set (206, 532) consisting of a target set of energy, scale value (533); Where the methods include: - 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 relates to the second source channel; Where the compensation value Energy is related to the interaction of the first low band signal and the second low band signal. During the down-mix time domain; - The first set of scaling of scale value energies (515, 516, 517) with downmix coefficients. First weighted; - The second set of scaling of the energy scale values (526, 527, 528, 529) with the coefficient Second weighted down mix; And - Determination of the target set of the scaled-valued energy (533) from the first set of the scaled-valued energy (515, 516, 517) and the second set of the scaled-valued energy (526, 527, 528, 529. 2 2. Method of claim 21, 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 is combined 2 3. How to merge the first source set (201) and the second source set (202) of the SBR parameter to the target set (206) of the SBR parameter, where - the first source set (201). ) Contains the first ever-economic index; Where the first envelope of the transistor index (414) with the first time boundary (417) is; - The second source set (202) contains the second envelope of the transport index; Where the second envelope transit index (423) with the second initial time boundary (426) is; - Target set contains more than one target envelope, each of which The goal has an initial time limit; - First Envelopes (414), Second Envelopes (423) and more than one Target Envelop are related to one or more periods of the first source signal, signal. The second source and the target signal, respectively; Methods include: - Selecting a predominant initial time boundary from the first initial time boundary (417) and the second initial time boundary (426); - determining the target envelope transport from leaning. Target Envelope Velope More than one number with the closest start time boundary (426) of the first start time region (417) and second default time region (426); And - Setting up the target envelope index to identify the target envelope 2 4. Method of claim 23 where the determination procedure consists of determining the objective of the target envelope. Envelop Transport targets from Envelopes of more than one target Envelop have The default time zone (426) is closest to the first default time zone (417) and the second default time zone (426), but no later than the default time zone. To happen First of the First Initial Clause and the Second Initial Clause 2 5. Method of any of the Previous Claims. Where each source set The SBR parameter corresponds to the SBR parameter associated with the channel of the HE-AAC bitstream (HE-AAC bitstream) 2 6. The N source combination method (201, 202, 203, 204, 205) of the SBR parameter provides Is M target set (208, 209) of the SBR parameter, where - N is greater than 2; - M is less than N; The method consists of: - Merging the source set pairs (201, 202) to form an intermediate set. (intermediate set) (206); And - a combination of an intermediate set (206) with another source set (204) or another intermediate set. (208) 2 7. Clause 26 method, where the merger process is performed according to the method of Any of claims 1 through 25 2. 8. Method of claim 26 through 27 where the source set (201, 202) corresponds to The higher acoustic relevance source channel is frequently merged. Less than the source set corresponding to the lower sound-related source channel 2. 9. What claim is a software program modified to act on the processor and perform various algorithms? One of the claims 1 to 28 when acting On a computer device 3 0. storage medium, which consists of software programs Modified to act on the processor and perform any of the claims algorithms. One of claims 1 through 28 when acting on computer equipment 3. 1. Computer program product which contains executable instructions for executing any one of the claims 1 through 28 when done 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 merge unit consists of a processor designed to execute different algorithms of one of the claims of Claims 1 to 28 3 3.Audio decoder designed to decode a HE-AAC bit stream consisting of N audio channels, where an audio decoder contains - AAC audio decoder designed to receive the encoded HE-AAC bit stream. and Provide a separate SBR bit stream; - The SBR (112) audio decoder according to claim 32, designed to provide target set M (208, 209) of SBR parameters from source N (201, 202, 203, 204, 205) of SBR parameters. , Where N > M (formula) 1 3 4. Audio decoder of claim 33, where the AAC audio decoder is also designed to provide N time domain low band audio signals compliant with N-channel audio; And where the audio decoder is supplemented by: - time domain downmix unit designed to provide M low-band audio signals, time-domain from N, low-band audio signals, time-domain; And - The SBR unit designed to generate M high-band audio signals from M low-band audio signals and M target sets of SBR parameters; Where the audio decoder is designed to provide M audio signal consisting of M low band and M high band audio, respectively 3. 5.Audio transcoder designed to provide a HE-AAC bit stream containing M audio channels from the HE-AAC bit stream containing N audio channels, where N > M ( Formula) 1, where the audio codec contains: - units merge parameters SBR (112) according to claim 32 3. 6.Electronic device designed to render M audio signal corresponding to M channel from HE-AAC bit stream containing N audio channels, where N > M (formula) 1, Where the electronic equipment consists of: - audio rendering means, designed to perform the sound of the M-channel audio; - receiver designed to receive the encoded HE-ACC bit stream; And - An audio decoder designed to provide the audio signal from the HE-AAC bit stream in accordance with one of the Claims 33 through 34.