KR100857102B1 - Method for generating encoded audio signal and method for processing audio signal - Google Patents

Abstract

The present invention relates to a method for generating an audio signal encoded in multichannel audio coding and a method for processing an audio signal.

The present invention provides fixed channel configuration information which is configuration information of a preset output channel; And a method of generating an encoded audio signal including arbitrary channel configuration information.

Description

{METHOD FOR GENERATING ENCODED AUDIO SIGNAL AND METHOD FOR PROCESSING AUDIO SIGNAL}

TECHNICAL FIELD The present invention relates to multichannel coding, and more particularly, to a method of generating an encoded audio signal and a method of processing an audio signal.

In general, a signal may exist in the form of a block, a band channel, and the like. Although these signals are advantageous in compression terms, they may be advantageously processed in a stationary section that maintains certain statistical characteristics. In this rapidly changing transient section, it is advantageous to divide and process the signal as much as possible in order to prevent distortion of the signal. In particular, in the case of an audio signal, a signal may be divided and processed for a channel configuration and a band configuration.

However, in the case where the signals are to be divided and processed, there is no specific method for expressing the divided information, and there is a problem in efficiently processing the signals.

The present invention is to solve the above problems, and to provide a method for efficiently expressing the information of the divided signal and a signal processing method using the information.

In order to achieve the above object, the present invention provides fixed channel configuration information which is configuration information of a preset output channel; And a method of generating an encoded audio signal including arbitrary channel configuration information.

1 is a conceptual diagram illustrating a signaling method of block division information according to an embodiment of the present invention;

2 to 3 are conceptual views illustrating a signaling method of band / channel segmentation information according to an embodiment of the present invention;

4 is a conceptual diagram for a method of generating a multi-channel signal using an embodiment of the present invention;

5 is a conceptual diagram illustrating a signaling method of channel division information according to an embodiment of the present invention.

Best Mode for Carrying Out the Invention

Hereinafter, specific embodiments of the present invention for achieving the above object will be described with reference to the drawings.

A signaling method of split information according to an embodiment of the present invention will be described by dividing the type of signal for convenience. The signal may exist in the form of a block, band, channel, or the like. In the present specification, a signaling method includes signaling or recognizing a signaled signal.

On the other hand, the term "node" as used herein refers to the point where the division of the signal is expressed. In addition, the term "spatial information" used in the present specification refers to information required in the process of down-mixing multiple channels or up-mixing to generate a multi-channel signal. Although the spatial information is described based on the spatial parameters, it is to be understood that the present invention is not limited thereto.

In addition, the spatial parameter is used when generating three channels from two channels and a channel level difference (CLD) representing an energy difference between two channels, inter channel coherences (ICC) representing a correlation between two channels, and two channels. Channel prediction coefficients (CPC), which are prediction coefficients.

Hereinafter, block division, band division, and channel division will be described.

(1) block division

Block processing is performed to process data such as compression of a continuous data on a time axis like an audio signal. The block processing means processing the input signal by dividing the input signal into a predetermined section or a predetermined interval. In this case, the interval used is defined as a block, and one or a plurality of blocks may be gathered to form a frame. The frame refers to a unit used for transmitting and storing data.

In the present invention, "block splitting" refers to a process of changing a block of an input signal into blocks of different sizes when the signal is processed while varying a block of an input signal. In addition, in the present invention, "block size information" is information indicating a block size when processing a signal while varying a block size of an input signal.

In general, when a signal exists in the form of a block, signal processing is performed using one of a long block and a short block. In this case, when the short block is used, a plurality of short blocks are bundled to correspond to one long block size.

However, since the characteristics of the signals vary from section to section, it is difficult to divide them into signal processing by long block or signal processing by short block for all signals.

Therefore, it is desirable to perform block division by selecting among more various block sizes suitable for signal characteristics in an arbitrary section. That is, there are blocks having two or more different sizes, and among them, an appropriate size block can be selected in various combinations within a frame.

To this end, it is necessary to inform which combination of blocks the current frame is composed, and a signaling method for this is needed.

The signaling method includes a sequential signaling method and a hierarchical signaling method.

The sequential signaling method is a method of previously defining the size (length, N) of a frame and signaling the number of minimum size blocks (M). In this case, the length N of the frame is a multiple of a specific M, and the size of the frame may be a fixed value or a value transmitted as separate information.

For example, if N = 2048, M = 256, and blocks are configured in the frame in the order of 256, 256, 1024, and 512 from the front, the block size information is M * 1, M * 1, M * 4, M * 2 => 1,1,4,2 => 0,0,3,1 may be a method for signaling.

In addition, the hierarchical signaling method includes a method of sending depth information of a layer and a method of not sending depth information of a layer, which will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram illustrating a signaling method of block division information according to an embodiment of the present invention.

As shown here, each layer is represented by a layer, and the depth of the layer is five.

Layer 1 is the longest block on which block division is based, and includes a first block 210 having a length of N. In addition, (1), (2), ..., (a), (b), (c), and (d) show an example of a binary signaling sequence. In the illustrated embodiment, block division information indicating whether a block is divided is represented by a partition identifier and an undivided identifier. 1 is used as a partition identifier and 0 is used as an undivided identifier.

The split identifier and the undivided identifier are represented at nodes of each layer.

The partition identifier means that any block of the upper layer is divided in half in the lower layer and a lower corresponding node is assigned to the lower layer. The undivided identifier means that any block of the upper layer is not divided in the lower layer and that the lower corresponding node for the node in which the undivided identifier is expressed is not allocated. The fact that the lower correspondent node is not assigned means that no further signaling is performed.

Since the block partitioning information 1 for the first block 210 is '1' in Layer 1, which is the highest layer, block partitioning of the first block 210 is performed. Layer 2, which is a lower layer of the layer 1, is composed of two blocks including a second block 220 and a third block 221 having a length of N / 2.

Since the block partitioning information 2 of the second-first block 220 is '1' in the layer 2 and the block partitioning information 3 of the second-two block 221 is '1', Layer 3 (layer 3), which is a lower layer of layer 2, has 3-1 blocks 230, 3-2 blocks 231, 3-3 blocks 232, and 3-3 having a length of N / 4. It consists of four blocks including four blocks 233.

In the layer 3 (block 3), the block partitioning information 4 for the third-1 block 230 is '0', and the block partitioning information 5 for the third-2 block 231 is '1', The block partitioning information 6 for the 3-3 block 232 is '1', and the block partitioning information 7 for the 3-4 block 233 is '0'. Therefore, according to the block division information of the layer 3, the 3-1 block 230 and the 3-4 block 233 of the layer 3 does not perform block division, but the 3-2 block 231 of the layer 3 ) And the third-3 blocks 232 only. At this time, the lower correspondent node is not allocated in the lower layer (layer 4) after the 3-1 block 230 and the 3-4 block 233 which do not block division in the layer 3. In addition, the 3-2 block 231 and the 3-3 block 232 having performed the block division in the layer 3 are assigned a lower correspondent node to a later lower layer to express block division in the lower correspondent node. do.

The layer 4 has a length of N / 8, and the 4-1 block 240, the 4-2 block 241, and the 3-3 block (the block division of the 3-2 block 231 of the layer 3) And a 4-3 block 242 and a 4-4 block 243 obtained by dividing the block 232 into blocks. In the layer 4, the block partition information 8 for the 4-1 block 240 is '0', and the block partition information 9 for the 4-2 block 241 is '1', and 4-3. The block partitioning information (a) for the block 242 is '0', and the block partitioning information (b) for the fourth to fourth blocks 243 is '0'. Therefore, according to the block partitioning information of the layer 4, the 4-1 block 240, the 4-3 block 242, and the 4-4 block 243 of the layer 4 does not perform block division, but the layer 4th-4-2 block 241 performs block division. In this case, the lower correspondent node (layer 5) after the 4-1 block 240, the 4-3 block 242, and the 4-4 block 243 that do not block division in the layer 4 is selected. 4-2 block 241, which does not allocate and performs block division in layer 4, allocates a lower correspondent node in a subsequent lower layer, whereby block division is expressed in the lower correspondent node.

The layer 5 has a length of N / 16 and includes a 5-1 block 250 and a 5-2 block 251 in which the 4-2 block 241 of the layer 4 is divided into blocks. In the layer 5, the block partitioning information (c) for the 5-1 block 250 is '0', and the block partitioning information (d) for the 5-2 block 251 is '0'. Therefore, since all block partition information of the layer 5 is '0', the block partition depth is no longer hierarchically, and the block partition depth of the block can be known.

Therefore, looking at the block layout of the block that can be configured by performing block division in a hierarchical manner, N / 4 block, N / 8 block, N / 16 block, N / 16 block, N / 8 block , N / 8 block, N / 8 block.

When the length of the signal is N, the plurality of block divided block lengths have the length of one of N / 2, N / 4, N / 8, N / 16, N / 32... If this is expressed as an expression, it can be expressed as N / x ⁱ . In the above formula, i = 1, 2, ..., p is any one, characterized in that p is an integer. And where x is 2.

In addition, the block division information expressed in binary numbers is expressed in binary signaling order (1) (2) (3) (4) (5) (6) (7) (8) (9) (a) (b) (c ), it can be represented by 13 bits of '1110110010000'.

The foregoing has described the case where the depth of the layer can be grasped by the block division information expressed by the split identifier and the undivided identifier, without separately expressing the depth information of the layer.

However, signaling of block partitioning information expressing depth information of a layer is also possible. For example, the depth information of the layer is represented by a split end identifier and a split duration identifier. The segmentation end identifier refers to the lowest layer where no block division is performed anymore, and the segmentation continuing identifier refers to a layer other than the lowest layer. Even in this case, the segmentation continued identifier may be expressed as '1' and the segmentation end identifier may be represented as '0'. The depth of the hierarchy illustrated in FIG. 1 is 5, which is 11110 when expressed in the above manner. The size of the subblock can be recognized by the above-described signaling scheme. As such, when the depth information is separately expressed, only the undivided identifier is finally expressed in the node allocated to the lowest layer, so that only the previous layer of the lowest layer may be signaled. For example, when the partition identifier is represented by '1', the undivided identifier is represented by '0', the partition segmentation identifier is represented by '1', and the partition end identifier is represented by '0', the partition of the node allocated to the lowest layer is divided. Whether the expression value may be represented by '0' which means the end of the division.

(2) band division

Looking at the band division with reference to Figures 2 to 3 as follows.

2 is a conceptual diagram illustrating a signaling method of band division information according to an embodiment of the present invention.

Referring to FIG. 2, the present invention relates to hierarchical band division having a tree structure in a subband filterbank. In the following method, the frequency resolution of the subband can be freely defined.

Comparing FIG. 2 with FIG. 1, FIG. 1 illustrates a case in which one long block forms the best layer, while the band division scheme illustrated in FIG. 2 includes a plurality of bands in the top layer.

In the illustrated embodiment, band splitting information indicating whether a band is divided is represented by a splitting identifier and an undivided identifier. 1 is used as a splitting identifier and 0 is used as a splitting identifier. The splitting identifier and the undivided identifier are expressed in nodes of each layer. The splitting identifier means that an arbitrary band of the Mth layer is divided in half in the M + 1 layer. The undivided identifier means that any band of the Mth layer is not divided in the M + 1 layer and that the lower correspondent node for the node in which the undivided identifier is expressed is not allocated. The fact that the lower correspondent node is not assigned means that no further signaling is performed.

Layer 1, which is the highest layer, includes the first-first band 310, the first-second band 311, the first-third band 312, the first-fourth band 313, and the first- fifth band. It consists of six bands, including the band 314 and the first to sixth bands 315. The band division information 1 of the 1-1 st band 310 is '1', the band division information 2 of the 1-2 band 311 is '1', and the band of the 1-3 band 312 The division information 3 is '0', the band division information 4 of the first-4 bands 313 is '0', the band division information 5 of the first-5 bands 314 is '0', The band division information 6 of the first to fourth bands 315 is represented by '0'.

The above-described band division information is expressed in a node assigned to layer 1. The first-first band 310 and the first-second band 311 generate the signal conversion modules 310T and 311T (called 'band conversion modules' in this embodiment) according to the band division information (1, 2). The lower bands 320, 321, 322, and 323 are generated in the layer 2. Subordinate corresponding nodes are allocated to the lower bands 320, 321, 322, and 323. On the other hand, the 1-3 bands, the 1-4 bands, the 1-5 bands, and the 1-6 bands which do not perform band division do not generate a band conversion module, and correspond to a later layer (layer 2). No subbands are created. Therefore, the lower correspondent node is also not assigned.

In the layer 2, the second-first band 320 formed by banding the first-first band 310 and the second-second band 321 and the second-second band formed by banding the first-second band 311 are separated. And a third band 322 and a second-4 band 323. The band division information 7 of the second-1 band 320 is '1', the band division information 8 of the second-2 band 321 is '1', and the band of the second-3 band 322. The segmentation information 9 is represented by '0', and the band segmentation information 10 of the second through fourth bands 323 is represented by '0'.

The second-first band 320 and the second-second band 321 generate the band conversion modules 320T and 321T according to the band division information 7 and 8 to generate the lower bands 330, 331, and 332 in Layer 3. , 333). Subordinate corresponding nodes are allocated to the lower bands 330, 331, 332, and 333. On the other hand, the 2-3 bands and the 2-4 bands that do not perform the band division do not generate the band conversion module, and no lower band corresponding to the layer (layer 3) is also generated. Therefore, the lower correspondent node is also not assigned.

In the layer 3, a third-1 band 330, a third-2 band 331, and a second-2 band 321 are formed by band-dividing the second-first band 320. And a third band 332 and a third-4 band 333. The band division information 11 of the third-1 band 330 is '1', the band division information 12 of the third-2 band 331 is '0', and the band of the third-3 band 332 The division information 13 is represented by '0', and the band division information 14 of the third to fourth bands 333 is represented by '0'.

According to the band division information 11, the third-first band 330 generates the signal conversion module 330T to generate lower bands 340 and 341 in the layer 4. Sub-bands 340 and 341 are allocated sub-corresponding nodes. In contrast, the 3-2 band, the 3-3 band, and the 3-4 band which do not perform the band division do not generate the band conversion module, and no lower band corresponding to the layer (layer 4) is generated later. . Therefore, the lower correspondent node is also not assigned.

The rare 4 includes a 4-1 band 340 and a 4-2 band 341 formed by splitting the 3-1 band 330 into bands. The band of the 4-1 band 340 The division information 15 is expressed as '0', and the band division information 16 of the fourth-2 band 341 is represented as '0'. Therefore, the lower layer that performs band division no longer exists and the signaling ends. In this case, the lowest layer is layer 4.

Then, the band division information expressed in binary is (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) which are binary signaling sequences. (13) (14) (15) (16) can be represented by 16 bits of '1100001100100000'.

3 is a conceptual diagram illustrating a signaling method of band division information according to another embodiment of the present invention.

3 is similar to the process of performing band division as compared to FIG. 2. However, the order of binary signaling of the band split information is different. The order is described in the figure.

Therefore, the band division information expressed in binary numbers is (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12). (13) (14) (15) (16) can be represented by 16 bits of '1110001001000000'.

The foregoing has described the case where the depth of the layer can be grasped by band division information expressed by the split identifier and the undivided identifier, without separately expressing the depth information of the layer.

However, signaling of the band splitting information representing the depth information of the layer may also be performed. For example, the depth information of the layer is represented by a split end identifier and a split duration identifier. The segmentation end identifier refers to the lowest layer where no further band division is performed, and the segmentation continuing identifier refers to a layer other than the lowest layer. Even in this case, the segmentation continued identifier may be expressed as '1' and the segmentation end identifier may be represented as '0'. The depth of the layer illustrated in FIGS. 2 to 3 is 4, which is 1110 when expressed in the above manner. The size of the subband can be recognized by the above-described signaling scheme. As such, when the depth information is separately expressed, only the undivided identifier is finally expressed in the node allocated to the lowest layer, so that only the previous layer of the lowest layer may be signaled. For example, when the partition identifier is represented by '1', the undivided identifier is represented by '0', the partition segmentation identifier is represented by '1', and the partition end identifier is represented by '0', the partition of the node allocated to the lowest layer is divided. Whether the expression value may be represented by '0' which means the end of the division.

(3) channel division

Since the channel segmentation information is related to the channel configuration information used when configuring the channel, the channel segmentation information will be described in detail while describing the channel configuration information. In particular, the information on the channel configuration in the case of encoding and decoding the multi-channel audio signal will be described as an example.

First, there is a basic spatial information that is essential in multichannel audio coding.

The basic spatial information includes basic environment setting information representing configuration information of the basic environment and basic data corresponding to the basic environment setting information. In addition, there is extended spatial information that is optionally required in multichannel audio coding. The extended space information includes extended environment setting information representing configuration information of the extended environment and extended data corresponding to the extended environment setting information. At least one configuration information regarding the above-described extended environment may exist, and the above-described extended environment may be identified by a type identifier.

On the other hand, the channel configuration mentioned in the coding of the multi-channel audio signal can be divided into two cases. One is the basic channel configuration and the other is the extended channel configuration.

The information on the basic channel configuration has information on at least one channel configuration, which means information on one channel configuration selected from among them. For convenience, basic channel configuration information will be referred to as 'fixed channel configuration information', and multi-channels generated according to the fixed channel configuration information will be referred to as 'fixed output channels'. In order to generate the above-described fixed output channel, fixed channel configuration information and corresponding fixed channel configuration data are required.

The information on the fixed channel configuration is information on one channel configuration selected from the information on the channel configuration already set. The set channel configuration may assume various cases. Examples of channel configurations include 5-1-5, 5-2-5, 7-2-7, and 7-5-7. The 5-2-5 configuration refers to a channel configuration for downmixing six input channels to two channels and outputting the downmixed channels to six channels. The rest of the channel configuration is likewise described. The fixed channel configuration information described above is included in basic configuration information, and data corresponding to the fixed channel configuration information is included in basic data. As the basic data described above, CLD which means energy difference between two channels, ICC which means correlation between two channels, and CPC which is a prediction coefficient used when generating three channels from two channels may be used.

In addition, the extended channel configuration refers to a channel configuration formed after the above-described fixed channel configuration. In the above-described extended channel configuration, a channel configuration is arbitrarily formed according to the encoded signal. Therefore, for convenience, the information on the extended channel configuration will be referred to as 'arbitrary channel configuration information'. The multi-channel generated by the arbitrary channel configuration information will be referred to as 'arbitrary output channel'. The arbitrary channel configuration information described above is included in the extended configuration information, which is identified by a type identifier called a channel identifier.

The arbitrary channel configuration data corresponding to the arbitrary channel configuration information is included in the extension data. The random channel configuration data may use only CLD, which means an energy difference between two channels, for the purpose of simplifying the calculation amount.

The arbitrary channel configuration information is expressed by a split identifier and an undivided identifier. The split identifier, which is a component of the arbitrary channel configuration information, means an increase in the number of channels, and the unsplit identifier indicates a case where there is no change in the number of channels. For example, the split identifier means that one input channel is converted into two channels and outputted, and the unsplit identifier means that the input channel is output as it is. When the partition identifier is expressed in the upper node allocated to the channel of the upper layer, the lower channel is generated in the lower layer, and the lower corresponding node is allocated corresponding to the generated channel.

However, if an undivided identifier is expressed in the upper node allocated to the channel of the upper layer, the lower channel is not created in the lower layer. Therefore, the lower correspondent node is also not assigned. A method of expressing the arbitrary channel configuration information by the split identifier and the undivided identifier will be described with reference to FIGS. 2 to 3. 2 to 3 illustrate not only the above-described band division but also channel division, and thus are used.

First, FIG. 2 will be described.

Layer 1, which is the highest layer, includes the first-first channel 310, the first-second channel 311, the first-third channel 312, the first-fourth channel 313, and the first- fifth channel. Channel 314, the first to sixth channel (315).

The first-first channel 310 to the first- sixth channel 315 may be the fixed multi-channels described above.

In the present embodiment, the partition identifier is represented by 1, and the unpartitioned identifier is represented by 0. The method of expressing arbitrary channel configuration information by the illustrated method sequentially expresses 0 or 1 expressed in nodes allocated to the channels 310, 311, 312, 313, 314, and 315 of the layer 1, and the layer 2 of the layer 2. 0 or 1 expressed in nodes allocated to the channels 320, 321, 322, and 323 are sequentially expressed. In addition, 0 or 1 expressed in nodes allocated to the channels 330, 331, 332, and 333 of the layer 3 are sequentially expressed, and 0 or 1 expressed in the nodes allocated to the channels 340 and 341 of the layer 4 are sequentially represented. Express them sequentially. That is, after sequentially expressing whether the number of channels is increased in the nodes of the upper layer, the method of sequentially expressing whether the number of channels is increased in the nodes of the lower layer.

Therefore, the arbitrary channel configuration information by the above method is represented by 16 bits of '1100001100100000'. A method of expressing arbitrary channel configuration information as shown in FIG. 2 will be referred to as a "layer priority method" for convenience.

In the method of expressing the arbitrary channel configuration information illustrated in FIG. 3, when the first node is represented by 1 as a result of signaling by the first node of the upper layer, the number of sub-corresponding nodes of the first node is sequentially numbered. When the first node is represented by an undivided identifier, the first node is moved to the second node of the upper layer to sequentially indicate whether the number of channels is increased. Therefore, the arbitrary channel configuration information by the above method is represented by 16 bits of '1110001001000000'. A method of expressing arbitrary channel configuration information as shown in FIG. 3 will be referred to as a "branch-first method" for convenience.

Next, we will look at how to create a fixed output channel and a random output channel.

4 is a conceptual diagram of a method of generating a multi-channel signal using an embodiment of the present invention.

As shown, a random output channel (y) is generated through the operation of the downmix signal (x) and the base matrix (ml), and a random output channel through the operation of the fixed output channel (y) and the post matrix (m2). (z) is generated. The base matrix ml may be composed of two or more. The element of the base matrix m2 may be derived using at least one of CLD, ICC, and CPC and the fixed channel configuration information described above.

The component of the post matrix m2 may be derived using the CLD and the arbitrary channel configuration information.

Hereinafter, a method of generating a random output channel will be described in more detail.

First, a method of configuring a random channel using random channel configuration information will be described.

The case where the arbitrary channel configuration information is expressed by the branch-first method will be described as an example.

Signal processing according to the identifier is sequentially performed by recognizing a partition identifier or an undivided identifier which are components of the arbitrary channel configuration information. When the identifier is a partition identifier, one input channel is connected to the channel conversion module to generate two subchannels. On the other hand, when the identifier is an undivided identifier, the input channel becomes the random output channel as it is.

More specifically, it is as follows.

First, an initial value of the number of identifiers to be decoded is set to 1, an initial value of the number of random output channels is set to 0, and an initial value of the number of channel conversion modules is set to 0 (first step).

Recognize the identifier to be decoded (step 2).

If the identifier to be recognized is a partition identifier, the number of the channel conversion module and the number of identifiers to be recognized are increased by one.

If the recognized identifier is an undivided identifier, the number of random output channels is increased by one, and the number of identifiers to be recognized is decreased by one (step 3).

The second and third steps are repeatedly performed until the number of identifiers to be decoded becomes zero.

The signal processing method described above is repeatedly performed corresponding to the number of fixed output channels.

For example, a schematic diagram of the arbitrary channel configuration when the arbitrary channel configuration information is '11100010010000' is shown in FIG. 3. Here, 1 means a partition identifier, and 0 means an undivided identifier. In addition, the number of '1' refers to the number of channel conversion module (signal conversion module in Fig. 3), 0 means the number of the arbitrary output channel.

Meanwhile, the fixed output channel may generate an arbitrary output channel after re-mapping the order, which is represented by FIG. 5.

As shown, the fixed output channels 310, 311, 312, 313, 314, 315 are relocated via the remapping module 100. The rearranged fixed output channels 310 ', 311', 312 ', 313', 314 ', and 315' become the channels of the highest layer to generate the random output channel. Of course, you can rearrange the order of the arbitrary output channels.

Meanwhile, when channel mapping information for matching a channel with a speaker is included in the arbitrary channel configuration information, the arbitrary output channel may be mapped with the speaker.

The foregoing has described a case where the depth of a layer can be grasped by arbitrary channel configuration information represented by a split identifier and an undivided identifier, without separately expressing the depth information of the layer.

However, it is also possible to express arbitrary channel configuration information expressing the depth information of the layer separately.

For example, the depth information of the layer is represented by a split end identifier and a split duration identifier. The split end identifier refers to the lowest layer where the number of channels is not increased any more, and the split continue identifier refers to a layer that is not the lowest layer. Even in this case, the segmentation continued identifier may be expressed as '1' and the segmentation end identifier may be represented as '0'. The depth of the hierarchy illustrated in FIG. 3 is 4, which is 1110 when expressed in the above manner. As such, when the depth information is separately expressed, only the undivided identifier is finally expressed in the node allocated to the lowest layer, so that only the previous layer of the lowest layer may be signaled. For example, when the partition identifier is represented by '1', the undivided identifier is represented by '0', the partition segmentation identifier is represented by '1', and the partition end identifier is represented by '0', the partition of the node allocated to the lowest layer is divided. Whether the expression value may be represented by '0' which means the end of the division.

If it is expressed as such, the lowest layer may be known using the depth information, and the random output channel may be configured by considering the omitted zero.

Meanwhile, even if arbitrary channel configuration information is transmitted to the decoder, the decoder may not use it. This is a case where the decoder recognizes the size of the arbitrary channel configuration information and the corresponding arbitrary channel configuration data, but skips and decodes the corresponding size.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

As described above, the signaling method of the partitioning information according to the present invention includes, first, a hierarchical structure when subdividing a long block having a specific length from a short block having a plurality of different lengths. It is possible to signal information on a block splitting process with a minimum bit.

Second, it is possible to grasp the depth of the layer on which the division is performed and the end of the signaling signal only by the signaling signal itself, without having to separately transmit information on the number of bits used for signaling of the signal.

Third, it is possible to signal the segmentation development process from a plurality of subbands to any number of subbands having different sizes (for example, frequency widths) using a minimum number of bits.

Fourth, it is possible to signal the information of the process using the minimum bits for the up-mix process to the output channel having a larger number than the input channel.

Claims (21)

Including fixed channel configuration information which is configuration information of a preset output channel; And And including the arbitrary channel configuration information. delete delete delete delete delete delete Receiving an encoded audio signal including fixed channel configuration information and arbitrary channel configuration information; And And configuring an output channel by using the fixed channel configuration information and the arbitrary channel configuration information. The method of claim 8, wherein the random channel configuration information Whether to increase the number of channels in the node of the layer is expressed as a split identifier and an undivided identifier, When the upper node of the upper layer is represented by the partition identifier, the lower corresponding node is assigned to correspond to the number divided in the lower layer. And a lower correspondent node is not assigned to the lower layer when the upper node of the upper layer is represented by the undivided identifier. The method of claim 9, wherein the random channel configuration information And a channel mapping information for mapping an arbitrary output channel to a location of a speaker. 9. The method of claim 8, wherein configuring the output channel Generating a fixed output channel corresponding to a preset output channel using the fixed channel configuration information; And And generating a random output channel using the fixed output channel and the arbitrary channel configuration information. The method of claim 11, Generating the random output channel, Signal processing according to the identifier by sequentially recognizing a partition identifier or an undivided identifier that is a component of the arbitrary channel configuration information, If the identifier is a partition identifier, one input channel is connected to the channel conversion module to generate two lower corresponding channels. And if the identifier is an undivided identifier, the input channel becomes the random output as it is. 12. The method of claim 11, wherein generating the random output channel A first step of setting an initial value of the number of identifiers, an initial value of the number of random outputs, and an initial value of the number of channel conversion modules; A second step of recognizing the identifier; If the recognized identifier is a split identifier, the number of identifiers and the channel conversion module are increased in preset increments. If the recognized identifier is an undivided identifier, a third step of increasing the number of random output channels by a preset increment and decreasing the number of identifiers by the preset increment; And repeating the second and third steps until the number of identifiers becomes zero. The method of claim 13, wherein generating the random output channel And mapping the arbitrary output channel to a speaker according to the channel mapping information. delete An audio signal receiver configured to receive an encoded audio signal including fixed channel configuration information and arbitrary channel configuration information; And And a channel configuration unit configured to configure an output channel by using the fixed channel configuration information and the arbitrary channel configuration information. The method of claim 16, The random channel configuration information Whether the number of channels increases in the node of the hierarchy is expressed by the partition identifier and the undivided identifier. When the upper node of the upper layer is represented by the partition identifier, the lower correspondent node is allocated to correspond to the divided number in the lower layer. And a lower correspondent node is not assigned to the lower layer when the upper node of the upper layer is represented by the undivided identifier. 18. The method of claim 17, wherein the random channel configuration information And channel mapping information for mapping an arbitrary output channel to a location of a speaker. 17. The apparatus of claim 16, wherein the channel component is Generating a fixed output channel corresponding to a preset output channel by using the fixed channel configuration information; And an arbitrary output channel is generated using the fixed output channel and the arbitrary channel configuration information. The method of claim 19, The channel configuration unit, Signal processing according to the identifier by sequentially recognizing a partition identifier or an undivided identifier that is a component of the arbitrary channel configuration information, If the identifier is a partition identifier, one input channel is connected to the channel conversion module to generate two lower corresponding channels. And the input channel is the random output as is if the identifier is an undivided identifier. The method of claim 19, The channel configuration unit, And the random output channel is mapped to a speaker according to the channel mapping information.

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