TWI281356B - Device and method for generate a coded multi-channels signal and device and method for decode a coded multi-channels signal and recordable medium - Google Patents

Abstract

In a multi-channel encoder generating several different parameter sets for reconstructing a multi-channel output signal using at least one transmission channel, the data stream is written such that the two parameter sets are decodable independently of each other. Thus, a multi-channel decoder is enabled to skip a parameter set which is marked as optional and/or has a higher version number when reading the data stream and still to perform a valid multi-channel reconstruction using a data set marked as mandatory or a data set having a sufficiently low version number. This achieves a flexible encoder/decoder concept suitable for future updates characterized by backward compatibility and reliability.

Description

1281356 IX. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to multi-channel processing techniques for parametric audio, and more particularly to efficient placement of parameter side information when there are several different sets of parameters to be reconstructed. [Prior Art]

In addition to the dual stereo channels, the proposed multi-channel surround performance consists of a center channel C and two surround channels, namely the left surround channel Ls and the right surround channel Rs, and, if applicable, The subwoofer channel for the LFE channel (LFE = low frequency boost). This reference sound format is also known as 3/2 (plus LFE) stereo and has recently been referred to as 5" multi-channel, which means that there are three front channels 'two surround channels and one LFE channel. This proposed multi-channel surround performance typically requires five or six transmission channels. In a reproducible environment, at least five horns are required at each of the five locations to obtain the ideal so-called sweet point from the five correct horns. However, the subwoofer can be used in a fairly free manner for its position. There are several techniques for reducing the amount of data needed to transmit multi-channel audio signals. This technology is also known as joint stereo technology. For this reason, refer to Figure 5. Figure 5 shows a joint stereo device 6〇. This device can be implemented, for example, 'Intensity Stereo Technology (IS Technology) or Two-Channel Cue Code (BCC). Such devices typically receive at least two channels (CH1, CH2, ..., CHn) as input signals and output at least one single carrier channel (downstream mixing) and parameter data', i.e., one or more parameter sets. The parameter data is defined such that the parameter data can be used to calculate the original channels (CH1, CH2, ..., CHn) in the decoder. 1281356 Normally, the carrier channel will contain sub-band samples, spectral coefficients or time-domain samples, etc., which provide a fairly sophisticated representation of the underlying signal, while the parameter data and/or parameter set does not contain any such samples or spectral coefficients. Instead, the parameter data contains control parameters 'for controlling the established reconstruction algorithm such as multiplication, time shift, frequency shift, etc. with weights. Reference

The data therefore contains only signals that are fairly coarsely represented or associated channels. In digital terms, the amount of data required for the carrier channel ranges from 60 to 70 kbit/s, while the amount of data required for parameter side information is from 1 Jkbit/s for one channel. As explained below, examples of parameter data are known scaling factors, intensity stereo information, or two-channel cue parameters. The intensity stereo coding technique is described in February 1994, in Amsterdam (AMSTERDAM), by J. HERRE, Kh BRANDENBURG, and D. LEDERER. Stereo encoding ''AES to be published in No. 3, 799. Usually, the intensity stereo is based on the spindle conversion applied to the data of two stereo audio channels. If you put most of the data points around the first spindle, you can The encoding gain is achieved by rotating the two signals at a given angle before encoding. However, this does not always apply to true stereo reproduction techniques. The reconstructed signals of the left and right channels contain identical transmission signals of different weights or scaled versions. Nonetheless, the amplitudes of the reconstructed signals are different, but they are the same for their phase information. However, the energy time envelope of the two original audio channels is maintained by the selective scaling of the frequency-selective operation. Operation. This is equal to the vocal sensation at high frequencies, where the main spatial cues are determined by the energy envelope. 1281356 In addition, In execution, the transmitted signal, ie the carrier channel, is formed by the summed signal of the left and right channels instead of the two components of rotation. Moreover, this processing, that is, generating the intensity stereo parameter to perform the scaling operation, is to select the frequency. The manner is implemented, that is, independent of the scale factor bands, i.e., the encoder frequency partitions. Preferably, a combined or ''carrier' channel is formed in combination with the two channels. In addition to the combined channel, the intensity stereo signal is based on the first channel energy, the second channel energy, and the combined or added channel energy.

BCC is a description of the two-channel prompt titled "Applying to Stereo and Multi-Channel Audio Compression" by MUNCHEN, C. FALLER, F. BAUMGARTE in May 2002. Coded AES Conference Paper 5 5 74. In BCC coding, a number of audio input channels are converted to a spectral representation using a DFT-based conversion with overlapping views. The formed spectrum is divided into non-overlapping compartments. The bandwidth of each partition is proportional to the equivalent right-angle bandwidth (ERB). The so-called mutual channel level difference (IC LD) and the so-called mutual channel time difference (ICTD) are calculated for each partition, i.e., each frequency band and time frame K, i.e., the time sampling area. The ICLD and ICDT parameters are quantized and encoded to obtain a BCC bit stream. Each channel has a mutual channel level difference and a mutual channel time difference with respect to a reference channel. In particular, depending on the particular signal partition to be processed, the parameters are calculated according to a predetermined formula. At the decoder end, the decoder receives a single tone signal and a BCC·· bit stream, that is, a first parameter set of mutual channel time differences and a second parameter set of mutual channel level differences. The tone signal is converted to the frequency domain and input to a synthesis zone that also receives the decoded ICLD and ICTD. In the synthesis zone or reconstruction zone, use

The 1281356 BCC parameters (ICLD and ICTD) implement the weighting operation of the tone signal to reconstruct the multi-channel signal, which represents the reconstruction of the original multi-channel audio signal after frequency/time conversion. In the case of BCC, the joint stereo module 60 acts on the output channel side information to quantify the parameter channel data and encode the IC LD and ICTD parameters, wherein one of the original channels can be used as the reference channel for sound supply. Road side information coding. Normally, the carrier channel is formed by the sum of the original channels with the parameter data. Of course, the above technique only provides a tone representation of a decoder that can only decode the carrier channel, but does not produce a parameter for generating more than one input channel or more. An audio coding technique known as BCC technology is further described in U.S. Patent Application Publication Nos. 2003/0219130 A1, 2003/ 0026 441 A1 and 2003/00355 5 3 A1. In addition, see Fowler and Bunga's "Two-Channel Cue Code, Part 2: Design and Application'', January 1st, 1994, Volume 1, IEEE No. 6: Audio and Voice Handling of journals. Also, see Fowler and Bongaldi's "Two-Channel Cue Code for Stereo and Multi-Channel Audio Compression", May 2002, unpublished, 1st 2nd Audio Engineering Society (AES) meeting, and by Hurley, Fowler, C. ERTEL, J. HILPERT, A. HOELZER, C. SPENGER The "MP3 environment: effective and compatible encoding of multi-channel audio, the 116th AES conference in Berlin (BERLIN) in 2004, unpublished product 6049. In the following, there are more for the 6th to 8th pictures. Detailed representation of a typical universal BCC design for multichannel coding. Figure 6 shows multichannel tone 1281356

Generic BCC coding design for frequency signal encoding/transmission. Input the multi-channel audio input signal at the input 1 1 0 of the BCC encoder 1 1 2 and make it "downstream mixing", in the so-called downmixing zone 1 1 4, that is converted into a single plus total channel. In an embodiment, the signal input to the 为 is a front left channel and a front right channel, a left surround channel and a right surround channel, and a center channel 5-channel surround signal. The downmix region produces a summed signal by simply adding these five channels as a single tone signal. All other downstream hybrid designs known in the art utilize multichannel input signals, in any case, whether Producing a single channel or having a mixed signal of a plurality of downlink mixed channels, the number of output signals is smaller than the number of original input channels. In this embodiment, if four carrier channels are generated from five input channels, Then, the operation of the downmixing has been completed. The single output channel and/or the number of output channels are output on the sum signal line 1 15 . The side information obtained by the BCC analysis area 1 16 is output on the side information line 117. On. BCC points The parameter set of ICLD, ICTD or mutual channel correlation (ICC値) can be calculated in the analysis area. Therefore, the reconstruction in the BCC synthesis area 122 has at most three different parameter sets (ICLD, ICTD and ICC). The aggregated sum signal and side information are typically transmitted to the BCC decoder 120 in a quantized and encoded format. The BCC decoder divides the transmitted summed signal into a number of sub-bands and performs scaling, delay and further processing to produce a reconstruction. Sub-bands of several channels. This processing is implemented such that the ICLD, ICTD, and ICC parameters (cue) of the reconstructed multi-channel signal at output 121 are similar to the original multi-sound at input 1 10 in the BCC decoder 1 12 Corresponding hint of the channel signal. For this reason, the BCC decoder 120 pack

1281356 contains B C C synthesis zone 1 2 2 and side information processing zone 1 2 3 . In the following, the sum signal on the line 1 15 of the BCC synthesis area 122 will be input to the time/frequency conversion area in which the filter is grouped in the filter. At the output of zone 125, there is a signal or, in special cases, if the audio filter bank 1 2 5 time domain samples produce a conversion of N spectral coefficients, then a frequency f BCC synthesis region 122 further includes delay stages 126, 127, mutual The processing stage 128 and the representative inverting filter bank are associated. As shown in Fig. 6, at the output of stage 1 29, there can be a reconstituted multi-channel audio horn 124 unit having, for example, 5 channels in the system. Figure 7 further illustrates the use of component 125 to input the input domain or filter bank domain. As indicated by node 1 3 0, component 1 2 5 will be amplified to enable the same number of signals to be obtained. The original signal equal to the number of output channels in the output signal to be reconstructed is subjected to a predetermined delay d !, d2, ' at the node 1 3 6 and the same signal delay is included at the output of block 1 2 6 . The delay parameters such as the channel time difference determined by the B C C analysis area 1 16 are calculated by the side information processing area 丨 2 3 in Fig. 6. The same applies to the multiplier parameter, a2.....ai, aN, and the mutual channel level difference determined by the analysis area 1 16 , which is also calculated by the side 123. The ICC parameters are calculated by the BCC analysis area 116 and used for internal structure. FB125 is implemented by N sub-bands from N I-coefficient regions. The level of the level modification level IFB 1 29 5-channel surround signal output is the version of the signal outputted by the number converted into frequency. If each version ..., d i, d n version, but delay parameters and, from each other according to BCC information processing area in the control block (S) -10-

The function of 1281356 1 2 8 results in a definite correlation between the delayed and level steering signals at the output of block 128. It is to be noted that the order of stages 126, 127, and 128 can be different from those represented in FIG. It is further noted that in the audio signal processed for the block, the B C C analysis is also performed for the block. Moreover, BCC analysis is also performed for the frequency, that is, the frequency selection method. This means that for each spectrum band, there are ICLD parameters, ICTD parameters and ICC parameters. The IC LD parameter for at least one channel across all frequency bands therefore represents the IC TD parameter set. The same applies to the IC LD parameter set, which for the reconstruction of at least one output channel, represents all ICLD parameters for all bands. The same applies to the ICC parameter set. According to the input channel or the total channel, for the reconstruction of at least one output channel, it again contains several individual ICC parameters of various channels. In the following, referring to Fig. 8, the figure shows the case where the BCC parameter is determined from this. Normally, ICLD can be defined between any channel pairing: [CTD and ICC parameters. However, the ICLD and ICTD parameters have traditionally been determined between a reference channel and each of the other input channels such that each input channel has a different set of parameters. This is also illustrated in Figure 8B. However, ICC parameters can be defined differently. As also shown in the schematic of Figure 8B, ICC parameters are typically generated in an encoder between any of the channel pairs. In this case, the decoder performs an IC C synthesis such that it gets roughly the same result when it is in the original signal between any of the channel pairs. However, it has been suggested to calculate only the ICC parameters between the two strongest channels at any time, i.e., at each time frame. This design is shown in Figure 8C, which shows an example of calculating and transmitting IC C parameters between channels 1 and 2, and another one of 1281356 counting IC C parameters between channels 1 and 5. Then, in the decoder, the mutual channels between the two strongest channels are synthesized and a further typical heuristic rule is performed for synthesizing the consistency of the mutual channels of the remaining channel pairs. The multiplication parameter a! .....aN is calculated, for example, according to the transmitted ICLD parameters, referenced to the AES conference file 5 5 74. The ICLD parameter represents the energy distribution in the original multichannel signal. Without loss of generality, Figure 8A shows four energy differences between all other channels and the front left channel.

IC LD parameters. In the side information processing area 123, the multiplication parameters a!.....aN are derived from the ICLD parameters such that the total energy of all reconstructed output channels is the same as or at least the energy of the existing transmitted summed signal. Just proportional. One way to determine these parameters is a two-stage procedure. In the first phase, the multiplication factor of the left front channel is set to 1 and the multiplication factor of the other channels in the 8th C picture is set to the transmitted ICLD. . Then, in the second stage, the energy of all five channels is calculated and compared to the energy of the transmitted summed signal. Then, reduce the proportion of all channels, that is, use a scale factor that is equal for all channels, wherein the scale factor is selected such that the total energy of all reconstructed output channels after scaling is equal to the transmitted summed signal and / Or the total energy of the summed signal has been transmitted. For the ICC transmitted from the BCC encoder to the BCC decoder as a method of mutual channel consistency measurement for further parameter sets, it should be noted that the manipulation of consistency can be implemented by a modified multiplication factor, such as by 20 log 1 0_6 Multiply the random number between 2 0 1 〇g 1 0 6 by the weighting factor of all sub-bands. The pseudo-random sequence has always been chosen so that all key bands change roughly -12-

1281356 is equal to zero and the average 値 in each critical band is zero. The same sequence is used for the spectral coefficients of each phased box or block. Therefore, the audio context width is controlled by modifying the variation of the pseudo-random sequence. Larger changes result in a larger listening width. Modification of the variation can be performed in individual frequency bands having a width of a critical frequency band. This allows for the simultaneous presence of several objects in a listening context where each object has a different listening width. The appropriate amplitude distribution of the pseudo-random sequence is uniformly distributed in logarithmic scale as indicated in the patent publication 2002/02 1 9 1 3 0 A1. In order to transmit five channels in a compatible manner, for example in a bit stream format suitable for normal stereo decoders, use G. THEILE and G. STOLL in October, 1990. In San Francisco (SAN FRAN CISCO) AES unpublished "Music Video Surrounding (MUSICAM SURROUND): Universal Multi-Channel Coding System Compatible with IS O/IEC 1 1 172-3" Matrix technology. Also, see February 1994, B. GRILL, Hurley, Brandenburg, E. EBERLEIN, J. KOLLER, J. MILLER The multi-channel coding technique described in the publication of "Promoted MPEG2 Audio Multi-Channel Coding", published by Amsterdam AES, No. 3, 85, in which a downlink mixing channel is obtained from the original input channel using a compatibility matrix. All in all, for example, as in 2004, E. SCHUIJER, J. BREEBAART, H. PURNHAGEN, Ingdgga at the 19th AES conference in Berlin, final publication No. 6073, titled ''low complex parameter stereo coding'' in the expert publication, you can say that BCC technology allows multi-channel audio material to be effective and backward compatible

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code. In this connection, reference should also be made to the MPEG-4 standard and in particular to the parametric audio technology, which is also known by the reference ISO/IEC 1 4496-3 ·· 200 1 /FDAM2 (parametric audio). In this regard, it should be mentioned, in particular the syntax in Tables 8, 9 of the MPEG-4 standard entitled "'ps_data() syntax". In this example, we should mention the syntax element" enable + icc '· and "enable-ipdopd', where these syntax elements are used to turn on and off the transmission ICC parameters and the phase corresponding to the mutual channel time difference. It should be further mentioned that the syntax element nicc _ data ( ) π '' ipd _ data () ” and π 〇pd __ data ()" In summary, it is important to note that the multichannel technology is usually used with one or several transmitted carrier channels, from which N original sounds are used. The track forms one transmitted channel, and N output channels or K output channels are reconstructed again, where Κ is equal to or smaller than the original channel number Ν. The problem in all of the techniques described so far is how to produce format compatibility between different types of decoders for multi-channel decoding of, for example, BCC decoders and parameter side information of disparate versions. In particular, when dissimilar multi-channel decoders are available on the market, while there are side information on disparate parameter sets generated by disparate multi-channel decoders on the market and therefore available for use with only a single decoder There are two problems. First, it is expected that a decoder with a high computational capacity will provide the best multi-channel quality when decoding. However, there will also be decoders operating under conditions of limited resources, such as decoders for mobile devices. Of course, such a decoder should provide multi-channel output with still as good a quality as possible, but should only have limited computing power. The problem caused by this is (Γ -14-

1281356 supports this adjustability, which allows decoding with high complexity and therefore the best quality and reduces complexity for decoding, but also correspondingly reduces the quality of spatial reconstruction can be a bit stream with parameter sets format. A further consideration when introducing a new generation/version of BCC encoder and such a BCC bit stream is how to maintain the compatibility between the BCC bitstream and the BCC decoder in a different version. In addition, it is expected that the new BCC parameter set and the updated old parameter set will be backwards compatible. Therefore, when there is a multi-channel design due to technological advances, it is of course expected to provide an upgrade path to BCC users who are allowed to introduce a new enhanced multi-channel design. On the other hand, the new BCC bitstream format typically creates incompatibilities between these bitstreams and various (older) BCC decoder versions. In particular, it is important to note that a multi-channel encoder/decoder is used in an increasing number of applications where the multi-channel encoder/decoder does not necessarily have the maximum computational capacity, but does not always require full sound quality. It is an object of the present invention to provide an effective and flexible concept that allows, for example, integration of new parameter sets or updating of old parameter sets while being resiliently used in a variety of different applications. This object is achieved by a device for generating a coded multi-channel signal as claimed in claim 1 of the patent application, a device for decoding a coded multi-channel signal as claimed in claim 15 of the patent application, such as a patent application A method for generating a coded multi-channel signal of the twenty-first aspect, a method for decoding a coded multi-channel signal according to the second aspect of the patent application, or a computer program according to the second aspect of the patent application. The present invention is based on the discovery that when encoding an encoded multi-channel signal into a stream of (8) -15 - 1281356, a backward compatible decoding of the encoded multi-channel signal is achieved, in addition to at least one transmission channel or Outside the carrier channel, the data stream contains at least two different parameter sets 'where the two parameter sets are written as a data stream such that reconstruction of the output channels can be performed less than at least two parameter sets. As in the present invention, the data stream is written so that the decoder can confirm which parameter set is needed for reconstruction and optionally which parameter set is needed for reconstruction. In this case, the decoder can only use the indispensable (i.e., obligatory) set of parameters for reconstruction, and ignore the selected parameter set if needed by the external situation. When only the necessary set of parameters is used for reconstruction, the result is that the decoder is fast and singular with a limited computational capacity, while at the same time, the other decoder can be implemented according to the same data stream representing the encoded multi-channel signal. Quality multi-channel reconstruction, however, the decoder also requires more time and/or more computational capacity and/or, more generally, more decoder resources.

In a preferred embodiment of the invention, the set of necessary parameters includes mutual channel level differences. As has been found in accordance with the present invention, these mutual channel level differences are extremely important in defining the basic multi-channel sound distribution between the output channels of all types of reproduction. The mutual channel time difference can be classified as an optional parameter set, because their main relevant time is when the sound is transmitted through the headphone of the two output channels of one transmission channel, or when multiple sounds are present. The sound of the channel is presented in the so-called equivalent π dry tone case, that is, when there is almost no echo. The mutual channel time difference can therefore be classified as an optional parameter set. The mutual relationship between the channels is important. Width and further the feeling of the listener, who is in a story with complex sound sources, such as the ancient-16- containing many non-interrelated sound components

The 1281356 parameter set takes another version number so that when the decoder accepts a parameter set that cannot process a higher version number, it simply rebuilds using the parameter set corresponding to the lower version number. Finally, it should be noted that the data stream representing the multi-channel signal does not necessarily have to include the transmission channel. Instead, they have been generated and transmitted separately, as in the case of writing a BCC parameter set to a corresponding channel in the CD, where the CD contains one (= equal to or greater than the transmission channel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail. [Embodiment] FIG. 2a shows a preferred embodiment of an apparatus for generating an encoded multi-channel signal representing an uncoded multi-channel signal, which is not encoded. The channel signal contains 1^ original channels that are fed into the input 20 of the means 2 2 to provide one transmission channel and parameter information having at least two parameter sets. In particular, at the output 23 of the means 22 The number of transmission channels output by the location is smaller than the number of original audio channels. The individual parameter sets representing the parameter information for reconstruction of the κ output channels are applied to the outputs 24a, 24b, 24c of the means 22 for providing.传输 One transmission channel equal to or greater than 1 and less than n is supplied to means 25, and the data stream is written at an output suitable for output 26, just like the parameter set at outputs 24a, 24b, 24c. As discussed above, Available from parameters Individually transmitting/storing downlink mixed information (M transmission channels). The means 25 for writing a data stream representing the encoded multi-channel signal is designed to write one transmission channel into the data stream and thus the first The second and -18-1281356 third parameter sets are written into the data stream, so that it is not necessary to use one of the three parameter sets and optimally, even without using at least two parameter sets of the three parameter sets, K can be completed. Reconstruction of the output channel. In this regard, the set of parameters for the supply means 22 outputs 24a to 24c are marked such that a parameter set such as the first parameter set absolutely requires reconstruction, and two further parameter sets, ie The second and third parameter sets are defined such that they are only selected for reconstruction.

The means for writing 2 5 writes the first parameter set as a necessary parameter set into the data stream and, as discussed below, writes only the second parameter set and the third parameter set of the selected parameter set into the data stream. . The data stream at output 26 of Figure 2a is fed into the data stream input 27 of the multi-channel decoder illustrated in Figure 2b. Supplying data to the means for reading data streams, wherein the means for reading the data stream 28, like the encoder shown in Figure 2a, again contains one of the transmitted sounds for the data stream The logic output 29 for the channel and, in turn, includes logic outputs 30a, 30b for the set of parameters contained in the data stream. In a preferred embodiment of the invention, the first set of parameters is marked as necessary or absolutely necessary for reconstruction, and the means for reading 28 will provide the first set of parameters to the means for reconstruction via the logical output 3 0 a 3 1. For example, the means for reading 28 is fixed to read only the necessary parameter sets and supply them to the means for reconstruction 3 1, means 28 will only skip the second set of parameters in the data stream at input 27. The second set of parameters is represented by the interrupt logic output 30b in Figure 2b. It is also possible to supply, via the control input 3 2, whether the necessary parameter set is extracted from the data stream or a control signal which is also selected as a parameter set and supplied to the means 31, to the means 2 8, wherein the resources obtained therefrom Availability-1 9 - C§) At least two parameter sets required for 1281356 channel reconstruction are categorized. The parameter set that feels the most significant', that is, the reconstructed multi-channel signal quality, is marked as the necessary parameter set in the data stream, and only the other parameter sets are marked as the selected parameter set. The parameter set is then graded as necessary, selected, and, for example, a set of parameters needed for studio reconstruction can be implemented to achieve, for example, three scaling steps instead of just two steps. It is important to note that it is sufficient to indicate a mandatory or preferably a parameter set, since the unlabeled parameter set patterns are automatically caused by a lack of indication.

Figure la shows a data flow diagram. In the embodiment shown in Figure la, the data stream includes a first control area 10 numbered 1 1 with data of one of the transmission channels, and a set of parameters. Zone 12a, 12b, 12c. In a preferred embodiment of the invention, control region 10, as schematically illustrated in Figure 1b, contains various pieces of information. Therefore, the entry of the control region 10 信号 signals the number of necessary parameter sets in the column entitled '' n u m B c c D a t a M a n d π column. Moreover, field 1 0 1 signals whether there is a signal of the selected parameter set. For this purpose, the field labeled noptBccDataPresent" is used. Further control field 10 fields are issued with the number of optional parameter sets having the variable "numBccDataOpt". Further, the 103, 104, 105 zone signals the type of each parameter set and/or the parameter set i version number. This uses a field named "BccDatalcT. Further, the selected field sequence 106, 107, 108 is given to the selected length information named ''Lengthinfo' to be selected as the selection, that is, each parameter set included in the selected parameter set number. The length information is paid correspondingly. For example, the bit length of the i-th parameter set. As will be discussed below, "Lengthinfo'1 may also contain information about the number of bits required to issue a length signal or another alternative that may also include the actual length specification. twenty two-

1281356 I CLD — V 1. Alternatively, the data set can be written such that the obligatory data set is always stored in only one version of the data stream. Figure 3c shows the identification of the selected parameter set. Therefore, in the information about the selected parameter set, the parameter set identification codes 1 〇 3 to 1 0 5 in the lb diagram of each parameter set are read, and information about each parameter set selected is obtained. Moreover, as indicated by the instruction M〇ptChunkLen()'' in Fig. 3c, if the parameter set length is transmitted in the bit stream, the parameter set length of each of the selected parameter sets is read. For the decision to select the parameter set length information, reference is made to Figure 3d, which illustrates how the bit lengths of the various parameter sets are read from the data associated with each of the selected parameter sets in a preferred embodiment of the present invention. The parameter set read loop implemented by the decoder is schematically illustrated in Figure 4a. Therefore, the actual parameter set data in the area of Fig. 1a to Fig. 12c is read in BccD at a(). The reading of the length information is illustrated in Figure 4b. For example, BccDataLen

Bits specifies the number of bits required to signal the actual bit length of a block. Then BccD at aLen actually pays the bit length of a data. The two-stage system is flexible on the one hand and saves data on the other hand, because it is effective especially when the data block has a significant change in the bit length, especially when applied to a very different type and therefore a length parameter set. . This will allow the length of future data blocks to be arbitrarily defined. Finally, Figure 4c shows the switching of the parameter set, wherein the parameter set identification code as illustrated in Figure 3b is evaluated such that the parameter set is associated with the corresponding reconstruction algorithm, so that no mutual channel difference is taken, for example, Channel time difference, and vice versa. -24- (8>

1281356 Figure 4c further shows that when the confirmed parameter set is selected and is not expected to be decoded using the selected parameter set, the number of bits in the parameter set is skipped ("skip and succeed _"), when all necessary parameters have been read. When the set (or the data that is unknown to the decoder, for example, the set of turns), the output is started, and no further selection of parameter sets is required. (''Stop analysis, start output'). When the decoder has read at least one obligatory data block and cannot analyze further information in the data stream, the decoder will start outputting accordingly. Therefore, it does not understand it. The data stream content does not cause the decoder to face a completely erroneous exit. This produces a very robust decoder. In the following, the functionality of the present invention will be explained in more detail in accordance with a preferred embodiment of the present invention. For example, The parameter information of various types of ICLD, ICTD, ICC and other parameter sets that can be defined in the future are contained in different and separate data sections, ie different proportioning layers. For this reason, refer again to Figure 4a. Up to Fig. 4c. The parameter set is divided into necessary or (obligatory) parameter sets such as mutual channel level difference parameter sets, and parameter parameters such as mutual channel time difference parameter sets and mutual channel correlation parameters. Provides the number of necessary parameter sets (numBccDataMand) and presence (OptBccDataPresent) and the number of selected parameter sets (numBccDataOpt). Normally, the information about the number of necessary parameter sets (niimBccData Mand) depends on the system specifications and therefore does not necessarily have to be explicitly transmitted 'but can be fixedly stored between the encoder and the decoder. 'Car father's is to explicitly transmit the number of selected parameter sets (numBccDataOpt). When there is a parameter (OptBccDataPresent) indicates the existence of the selected parameter set

-25-

At 1281356, as indicated in Figure 3a, the relevant part is started. In a preferred embodiment of the invention, a code (Be cD at a Id) is entered. Also as in the figure in Figure 3b, such as the information on the version of the parameter set method of ICLD, ICTD or ICC. Normally, it is necessary to issue it arbitrarily and explicitly issue the optional parameter. In this case, it must be stored in the code, for example, if the first parameter set encountered is necessary, including, for example, mutual channel bits. It is also clear from the order of the specified parameter set patterns that the J parameter set will best contain the parameter set long set length information. The decoder allows the decoder to know only the parameter set by even a few sets. 4b picture. In the preferred embodiment of the present invention, the counter-rational information is related to the necessary parameter sets in any case. Therefore, the necessary parameter set does not need to include the decoder when a parameter set is found and the parameter length information is used, and the decoder may be implemented. This parameter set is a necessary parameter set if it is between the set of available parameters and because it is not true. For the selected parameter set, it can be transferred depending on the application. In order to improve the encoder and the solution, the relative step of selecting the parameter set information is provided with an identification of each parameter set, and the identification code provides a correlation code, and/or an identification code signal whose signal set identifier signal is not clear. However, between the device and the decoder, the parameter set is set to a fixed reserve parameter set. In addition, the information of the parameter set type is determined early. Information. This parameter is provided with an overcorrelated bit, ignoring the exact bitstream syntax. In order for the decoder to analyze and process, it is impossible to discard only the parameter length information. Since the set does not contain any relevant further parameter sets (for example, ICLD), the length information of any corresponding information, or the interoperability between the non-compliant encoders, the simple -26-1281356 rule can include parameters for all selected parameter sets. Set length information. However, in order to save the bit, the length information of the last parameter set may not be transmitted because it is no longer necessary to skip the data and access a subsequent parameter set because the parameter set is the last parameter set anyway. As illustrated in FIG. 1a, when the data area is actually terminated by the second parameter set 1 2 c and subsequently, for example, 'there is no more total signal and/or one of the transmission channel areas just processed. This step is obviously useful when controlling information, etc.

For example, according to the resource availability information 32 (FIG. 2b), the explicit signaling may be, for example, according to the description in FIG. 3D, using the bit stream element of the notification decoder regarding the existence/length of the parameter set length information, The encoder dynamically signals the transmission of parameter length information. In the following, a preferred embodiment of the decoding procedure of the decoder shown in Fig. 2b will be discussed. The preferred decoder first checks the availability of the necessary (obligatory) parameter sets that are optimal for the mutual channel level difference parameter set. Moreover, when the syntax version number of the ICLD parameter set is higher than the version number that the decoder itself can decode, the reconstruction may not be completed by the reconstruction means 31 of Fig. 2b, wherein the syntax version supported by the decoder is, for example, from 1 to η. In all other cases, the normal decoding procedure in the established form can be accomplished by decoding the necessary set of parameters and when not using any of the optional parameter sets, performing multi-channel synthesis using only the necessary parameter sets. However, when the decoder detects the selected parameter set, it can use it or discard its contents. For example, according to the following discussion, two possibilities are selected. If the grammar version number of the selected parameter set is higher than this parameter set type (§) -27- 1281356 Reconstruction of multi-channel. In summary, the following again represents the basic characteristics of the decoder, which can advantageously be used by the decoder to achieve efficient and high quality decoding with low data rate data streams. For the reconstructed multi-channel signal quality, if the parameter set is less important than the other dream set in the κ output channel reconstruction, then the writing means 25 is designed to write the data set 'so that no need to use less It is possible to rebuild important data sets. Preferably, the writing means 25 is further designed such that the parameter set is provided with an associated identification code 1 1 to 1 0 5, wherein the identification code of the parameter set indicates that the reconstruction must absolutely use the parameter set 'or one of the other parameter sets The identification code indicates that the reconstruction can optionally use only the parameter set. Preferably, the writing means 25 is further designed to write the one transmission channel to the transmission channel portion U of the data set of the data stream, and write the first parameter set to the person

The first parameter set portion 12a writes the second parameter set into the second parameter set portion 1 2 b so that the decoder can reconstruct the K output channels without reading and interpreting the second parameter set portion 2 b . If the parameter set is selected from the following groups containing mutual channel bit difference, mutual channel time difference, mutual channel phase difference or mutual channel consistency information, then the intrusion means 2 5 g will be s ten The set of track quasi-parameters is indicated as having to be decoded and at least one other parameter set in the population is marked as optional decoding. Preferably, the writing means 2 5 § § is calculated such that the second parameter set is provided with a length information indicating that the amount of data in the data set belongs to the second parameter set 1 〇 6 to enable the decoder to skip the information according to the length The amount of data, which is -29-108 in length,

1281356 The best information is the length of the bit length including the length field and the length field contains the amount of bits to be given to the second parameter set. The best way is to write the writing means 25 and then design the number.资|成 indicates that many data streams are selected for the parameter set. It is not necessary to use the parameter coder to complete the reconstruction of K output channels. Preferably, the writing means 25 is further designed to link the grammar versions 103 to 105 with the parameter set such that the decoder will perform the reconstruction optimally using the corresponding parameter set only when the grammar version is in the state of the state. Yes, the second parameter set and, in turn, the parameter set, then only the grammar version information. Moreover, the last selected in the sequence of parameter sets in the data stream does not contain any associated length information. Moreover, the writing means 25 can be designed to signal the presence of the signal and the length of the length of the parameter set in the data stream. The means 22 for providing may be designed to provide a data zone sequence transmission channel based on at least one original channel sample zone sequence. Depending on the situation, the production and/or method may be implemented in hardware or software. The implementation can be carried out on a digital storage medium, in particular or with a control signal that can be electrically read out, which can be combined with the computer system to perform the method. Generally, when the computer is executed on a computer, the present invention is therefore also embodied in a computer program that stores the code stored in the carrier for implementing the method. _Block, : Yuan length % 102 Write: Set, Solution (This information ^ has pre-appreciation = apply to the number set! Can be issued to the IV [time. Time to take the code: the disk is stylized [type product readable device f. Another word -30-1281356' when the computer When the program is executed on a computer, the present invention can be implemented by a computer program having a program code for implementing the method. [Simplified Description of the Drawings] The preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. : FIG. 1a is a view of an encoded multi-channel signal having a predetermined data stream syntax according to an embodiment of the present invention; FIG. 1b is a detail of a control block of FIG. 1a according to an embodiment of the present invention;

2a is a block circuit diagram of an encoder according to an embodiment of the present invention; FIG. 2b is a block circuit diagram of a decoder according to an embodiment of the present invention; and FIGS. 3a to 3d are diagrams showing a preferred implementation of a parameter set configuration according to the present invention; Figure 4a to 4c show a preferred embodiment of the parameter set data of the present invention; Figure 5 shows a general representation of the multi-channel encoder;

6 is a schematic block diagram of a BCC encoder/BCC decoder path. FIG. 7 is a block circuit diagram of a BCC synthesis area of FIG. 6; and 8A to 8C are diagrams for calculating parameter sets ICLD, ICTD, and ICC. A representation of a typical outline. [Main component symbol description] 10 Control area 11 One transmission channel section. -31- 1281356

12a first parameter set section 12b second parameter set section 20 input (N input channel) 22 means 23 output (M transmission channel) 24a output (first parameter set) (required) 24b output (second parameter set) (optional) 24c output (third parameter set) (optional) 25 means 26 output 27 input 28 means 29 logic output 30a logic output 30b logic output 3 1 means 32 control input 33 output 60 joint stereo device 110 input 112 BCC code 114 Downstream mixing zone 115 summing signal line 116 BCC analysis zone

Cs) -32- 1281356

117 side information line 120 B C C decoder 12 1 output 122 BCC synthesis area 123 side information processing area 124 speaker 125 filter bank 126 delay stage 127 level modification level 128 interrelated processing level 129 level IFB 130 node

C8) -33-

Claims (1)

1281356 No. 94 1 45 265 "Implementation apparatus and method for encoded multi-channel signals, multi-acoustic coded; decoding device and method for channel signal and recording medium" Patent case (amended in January 2006) X. Patent application scope: 1. A device for generating a multi-channel signal, the signal representing a non-coded multi-channel signal comprising N original channels, wherein N is equal to or greater than 2, the device comprises: providing means (22 Providing parameter information (24a, 24b, 24c) from one of the transmission channels (23) for reconstructing one of the output channels 'where Μ is equal to or greater than 1 and equal to or less than n, where K is greater than Μ and Equal to or less than Ν, wherein the parameter information includes at least two distinct parameter sets for reconstructing one and the same output channel; and a writing means (2 5 ) for writing a data stream (2 6 ), The writing means (25) is designed to: write the first and second parameter sets into the data stream, so that it is not necessary to use the second parameter set and at least one of the one transmission channels (23) Channel, you can complete the κ output channel Road reconstruction at least soon. 2 . A decoding device for encoding a multi-channel signal, the signal representing a non-coded multi-channel signal comprising a plurality of original channels, wherein the encoded multi-channel signal is represented by a data stream containing parameter information, The parameter information is from one transmission channel and is used to reconstruct the inverse output channel, where Μ is equal to or greater than 1 and equal to or less than Ν, where Κ is greater than Μ and equal to or less than ν, wherein the parameter information is 1281356 - Include at least two different parameter sets for reconstructing one and the same output channel, and wherein the first and second parameter sets are written into the data stream, thereby completing reconstruction of the K output channels without Using the second set of parameters, the apparatus includes: a data stream reading means (28) for reading the data stream, thereby reading the first parameter set (30a) and skipping the second parameter set (30b). • 3. The device of claim 2, further comprising: a reconstruction means (32) for reconstructing the 使用 using the one transmission channel and the first φ parameter set without using the second parameter set Output channels. 4. The apparatus of claim 2, wherein the first parameter set includes related grammar version information (1 〇 3 to 105), and wherein the reading means (28) is designed to read the correlation The information of the grammar version drives the reconstruction means (3 1 ), whereby the reconstruction is performed by the reconstruction means only when the read grammar version information is compatible with the specified grammar version information of the decoding device. ® 5. The device of claim 2, wherein the second parameter set contains relevant grammar version information (1 0 3 to 1 0 5 ) 'and wherein - the reading means (28) is designed to : when the read grammar version ^ information is incompatible with the specified grammar version information of the decoding device', then the second parameter set is skipped; and when the grammatical version of the 5 pirated version is only associated with the specified grammar When the version information is compatible, the second parameter set is read. 6. The device of claim 2, wherein the first parameter set -2- 1281356 includes length information indicating the amount of data of the related second parameter set, and wherein the reading means (28) is designed to: according to the length information, skip the amount of data in the data set indicated by the length information, without Parse the data of the second parameter set. 7. The apparatus of claim 2, wherein the reading means (28) is controllable to obtain resource available information, and The reading means (28) is further configured to: when the resource available information indicates sufficient resources, read in the second parameter set; and when the resource available information indicates insufficient information, skip the second parameter set . 8. The apparatus of claim 2, wherein a parameter set is less important than another parameter set of K output channel reconstructions relative to the quality of a reconstructed multi-channel signal, and wherein The data stream reading means (28) is designed to skip the less important data set. 9. The device of claim 2, wherein the data stream comprises a parameter set having a correlation identifier (100 to 105), wherein an identification code of a parameter set indicates that the parameter set must absolutely be used for reconstruction Or the identification code of another parameter set indicates that the parameter set can only be selectively used for reconstruction, wherein the data stream reading means (28) is designed to: detect the identification code and read the necessary a set of parameters, and the optional parameter set is skipped based on the detected identification code. 1 . The device of claim 2, wherein the data flow system comprises a first parameter set in the first parameter set portion (12 a) and a second parameter 1281356 month, repair (more) positive replacement page i a second parameter set in the set (12b), wherein the data stream reading means is designed to: interpret the data stream relative to the parameter set portion, read the first parameter set portion, and skip the second Parameter set section. 1 1. The device of claim 2, wherein the parameter set is selected from the group consisting of: an interactive channel bit difference, an interactive channel time difference, an interactive channel phase difference, or an interactive channel consistency information, Wherein, in the data stream, the set of interactive channel level deviation parameters is marked as absolutely necessary for decoding, and wherein at least one other parameter set in the group is marked as selectively used for decoding, and wherein The data stream reading means (28) is designed to read in the set of interactive channel level deviation parameters and skip the other parameter set from the group. 1 2 . The device of claim 2, wherein the data flow includes quantity information (1 02) indicating a plurality of optional parameter sets, and the K output sounds that can be completed by the decoder are not required. The reconstruction of the track, wherein the data stream reading means is designed to read at least one selected parameter set according to the quantity information. 1 3. The apparatus of claim 2, wherein the grammar version information is used in the data stream for the second parameter set, and if appropriate, the parameter set is used. 1 4. The device of claim 1 or 2, wherein the last selected parameter set in a series of parameter sets in the data stream does not contain any relevant length information, wherein the data stream reading means (28) is designed Cheng: Do not read and interpret any length information until the last selected parameter set is read. -4- -- Η 1281356 1 5 · The device of claim 2, wherein the data stream dynamically signals the existence and length of the parameter set length information, and wherein the data stream reading means 2 8) Designed to: first detect the existence of the parameter set length information in the data stream, and then extract the length of the parameter set length information from the data stream according to a detected existence. 16. The device of claim 3, wherein the one output channel is a B C C downstream mixing channel, and the parameter set comprises a B C C parameter, and wherein the reconstruction means (32) is designed to perform BCC synthesis. 1 7 - A method for generating an encoded multi-channel signal, the signal representing an uncoded multi-channel signal comprising one of the original channels, wherein Ν is equal to or greater than 2, the method comprising: providing (22) from The parameter data (24a, 24b, 24〇) of the transmission channel (23) is used to reconstruct one output channel, where Μ is equal to or greater than 1 and equal to or less than Ν, where Κ is greater than Μ and equal to or less than Ν, where The parameter information includes at least two distinct parameter sets for reconstructing one and the same output channel; and writing (2 5) - data stream by writing the first and second parameter sets into the data stream (26), so that it is not necessary to use the second parameter set and use at least one of the one transmission channels (23) to complete the reconstruction of at least one of the one of the output channels. A decoding method of a coded multi-channel signal representing an uncoded multi-channel signal comprising a plurality of original channels, wherein the encoded multi-channel signal is represented by a data stream containing parameter information ' -5 - 27 1281356 and the parameter information is from one transmission Channel and used to reconstruct K output channels, where Μ is equal to or greater than 1 and equal to or less than Ν, where Κ is greater than Μ and equal to or less than Ν, wherein the parameter information includes at least two distinct parameter sets for Reconstructing one and the same output channel, and wherein the first and second parameter sets are written into the data stream, thereby completing the reconstruction of the one output channel without using the second parameter set, the method comprising: reading Taking the data stream (2 8) to read the first parameter set (30a) and skipping the second parameter set (30b). 1 9. A computer recording medium for storing a computer program, the computer program is on the computer When executed, it can be used to implement the code of the method of claim 17 or 18. -6- 1281356^^一,图·· 957X1727 — Year of the month repair (more) replacement page 10 11 12a 12b 12c Control area M face channels first and second i-th parameter set parameter set parameter set diagram Aml 00, 01, 02 03 04, 05, 97 98 BCCDaials Bcsataol nu 彐BCCDataopt oPSGCDatapreses numDDCGD3t3Mand numBccDataMand: optBccDataPresent: numBccDataOpt: BccDatalDi: Lengthlnfo optional i; BCCDatao Lengthlnfo optional 1 Lengthlnfo optional 2 Lengsnfo oPHOnal No. 3 editorial length? And the number of digits of the number of types of sets of sets of sets of numbers, the number of choices, the number of parameters, the reference number, the number of items, the number of items, i must be selected, the first IB figure *'· Cfy^f 1281356 20, the encoder N-channel audio (N>2) 22 25 传输 传输 a transmission channel provides means for the first parameter set (required) t to write the proportional parameter set to the data stream (second parameter set (optional) [ Three-parameter set (optional, 24a 24b 24c 26, data flow with scaled parameter set, Figure 2A) Resource availability Information Figure 2B Figure 1281356 Repair (more) replacement page 选用 Select the existence and number of parameter sets numBccData = numBccDataMand; if (optBccDataPresent) { 1 uimsbf numBccData += numBccDataOptMl 3 uimsbf + 1: OptChunklnfoQ; Figure 3A Parameter Set Identification Code BccDatalD Symbolic name 0 (reserved) 1 ICLD V1 2 ICTD V1 3 ICC V1 4 ICLDJ/2 > =5 Undefined (reserved) V1.V2: Syntax Version Information ICLD: mutual channel level difference ICTD: mutual channel time difference ICC: mutual channel consistency information 3B Figure 1281356 Use parameter set identification OptChunklnfo() { for (bccData = numBccDataMand; bccData<numBccData; bccData++}{ bccDataOptional [bccData] = 1; bccDatalD[bccData]; 6 uimsbf GetOptChunkLenQ; 3C map selects the length of the parameter set OptChunkLen() { if (bccData != numBccData -1) { if (bccDataLenBitsPresent[bccData]) { 1 bccDataLenBits[ bccData] = 4 uimsbf bccDataLenBitsMI [bccData] + 1; } } else { bccDataLenBitsPresent[bccData] = 0; 3D Figure 1281356 ancestor, 丄f ? Year and month repair (more sample change: (four) 1 parameter set read loop for (bccData = 0; bccData <numBccDaia; bccData ten +) { ChunkLenQ; BccDataQ; Figure 4A Length information read ChunkLenQ { if( bccDataLenBitsPresent[bccData]) { bccDataLen[bccData] bccDataLenBits uimsbf Figure 4B 1281356 95^ ll 27 — Year and month repair (more j is replacing page parameter set switching BccData() { switch (bccDatalD[BccData]){ Case ICLD—V1: lcldVIData(numBccBlocks); break; case ICTD-V1: IctdVIDatai); break; case ICCJ/1: lccV1Data(); break; case ICLD_V2: lcldV2Data(); break; default: if (bccDataOptional[BccData] ) { if (bccDataLenBitsPresent[bccData]) Γ skip and continue 7; else Γ stop parsing, start output 7 elseT exit 7; 4C Figure 1281356 95.11 27 years of repair (more; 60 CH1 -^ CH2 IS or BCC device CHN carrier channel Parameter data of carrier channel Figure 5 • 1281356 95, 11 27 , · J Figure 6 127 Figure 7 1281356 95.11 27 "........ "Two ' Ji Central Figure 8