KR101434834B1 - Method and apparatus for encoding/decoding multi channel audio signal - Google Patents

Abstract

The present invention relates to a method of decoding a multi-channel audio signal, which detects a type of spatial extension data included in a result of encoding an audio signal, and outputs spatial extension data, which represents a core audio object type The core audio object type is detected and the core audio data is decoded by the decoding method according to the detected core audio object type. If the spatial extension data is the residual coding data, the decoding method according to the core audio object type The dual codec data is decoded and the decoded core audio data is upmixed by using the decoded residual coding data so that the core audio data and the residual coding data are decoded by the same decoding method to reduce the decoding step complexity.

Description

[0001] The present invention relates to a method and apparatus for encoding / decoding multi-channel audio signals,

The present invention relates to a method and apparatus for encoding / decoding a multi-channel audio signal, and more particularly, to a method and apparatus for encoding / decoding a residual signal used for upmixing an audio signal.

MPEG (Moving Picture Experts Group) surround technology is a technology for compressing audio data of a spatial sound source in the encoding of an audio signal, and includes MPEG Audio Layer-3 (MP3), Advanced Audio Coding (MPEG) Or MPEG-4 High Efficiency (AAC) -AAC audio to high-quality multi-channel surround audio. MPEG Surround maintains backward compatibility with existing stereo equipment and has the advantage of reducing the bitrate, or transmission rate, required for high quality multi-channel audio compression while using existing equipment.

According to the MPEG Surround standard, a core audio signal is encoded using any one of BSAC (Bit Sliced Arithmetic Coding), AAC, and MP3 (MPEG Audio Layer-3) signal) is encoded by AAC only.

Therefore, when the core audio signal is encoded according to the MPEG Surround standard in a coding scheme other than AAC, the core audio signal and the residual signal must be encoded by different coding schemes at the coding stage. Likewise, the decoding unit must decode the core audio signal and the residual signal by different decoding methods.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for decoding a multichannel audio signal capable of reducing the complexity of a decoding stage when decoding a residual signal.

Another object of the present invention is to provide a method and apparatus for encoding a multi-channel audio signal that can reduce the complexity of an encoding step when a residual signal is encoded.

According to another aspect of the present invention, there is provided a method of decoding a multi-channel audio signal, the method comprising: detecting a type of spatial extension data included in a result of encoding an audio signal; Detecting the core audio object type if the spatial extension data is data indicating a core audio object type in which core audio data is encoded; Decoding the core audio data using a decoding method according to the detected core audio object type; Decoding the residual coding data using the decoding method according to the core audio object type if the spatial extension data is residual coding data; And upmixing the decoded core audio data using the decoded residual coded data.

The method includes detecting a type of spatial extension data included in an encoding result of an audio signal; Detecting the core audio object type if the spatial extension data is data indicating a core audio object type in which core audio data is encoded; Decoding the core audio data using a decoding method according to the detected core audio object type; Decoding the residual coding data using the decoding method according to the core audio object type if the spatial extension data is residual coding data; And upmixing the decoded core audio data using the decoded residual coding data. The present invention also provides a computer-readable recording medium having recorded thereon a program for executing a decoding method of a multi-channel audio signal.

According to another aspect of the present invention, there is provided an apparatus for decoding a multi-channel audio signal, the apparatus including: a spatial extension data type detector for detecting a type of spatial extension data included in a result of encoding an audio signal; A core audio object type detector for detecting the core audio object type when the spatial extension data is data indicating a core audio object type in which core audio data is encoded; A core audio data decoding unit decoding the core audio data using a decoding method according to the detected core audio object type; A residual coding data decoding unit for decoding the residual coding data using the decoding scheme according to the core audio object type if the spatial expansion data is residual coding data; And an upmixing unit for upmixing the decoded core audio data using the decoded residual coded data.

According to another aspect of the present invention, there is provided a method of encoding a multi-channel audio signal, the method including generating down-mixed audio signals to generate core audio data and residual data; Encoding the core audio data according to a predetermined encoding scheme; Encoding the residual data according to the predetermined encoding scheme according to a core audio object type in which the core audio data is encoded; And outputting the encoded core audio data and the encoded residual data as a result of encoding the audio signal.

According to another aspect of the present invention, there is provided a method for reproducing audio data, the method comprising the steps of: generating a core audio data and a residual data by downmixing an input audio signal; Encoding the core audio data according to a predetermined encoding scheme; Encoding the residual data according to the predetermined encoding scheme according to a core audio object type in which the core audio data is encoded; And outputting the encoded core audio data and the encoded residual data as a result of encoding the audio signal. A computer-readable recording medium having recorded thereon a program for executing a method of encoding a multi-channel audio signal, Lt; / RTI >

According to another aspect of the present invention, there is provided an apparatus for encoding a multi-channel audio signal, comprising: a downmixing unit for downmixing an input audio signal to generate core audio data and residual data; A core audio data encoding unit for encoding the core audio data according to a predetermined encoding scheme; A residual data encoding unit for encoding the residual data according to the predetermined encoding scheme according to a core audio object type in which the core audio data is encoded; And a multiplexer for outputting the encoded core audio data and the encoded residual data as a result of encoding the audio signal.

According to another aspect of the present invention, there is provided a method of decoding a multi-channel audio signal, the method comprising: receiving a bitstream including a bitstream corresponding to a downmixed audio core signal and additional information for generating a multi- ; Detecting a core object type from a bitstream corresponding to the downmixed audio core signal; Decoding the downmixed audio core signal by a decoding method determined by the detected core object type; Decoding the residual coding data using the decoding method according to the core audio object type if the spatial extension data included in the additional information for generating the multi-channel is residual coding data; And upmixing the decoded core audio data using the decoded residual coded data.

According to the present invention, when the type of the spatial extension data included in the encoding result of the audio signal is detected and the spatial extension data is data indicating the core audio object type in which the core audio data is encoded, the core audio object type is detected Decodes the core audio data using a decoding scheme according to the detected core audio object type, decodes the residual coding data using a decoding scheme according to the core audio object type if the spatial extension data is residual coding data, By upmixing the core audio data using the decoded residual coding data, the core audio data and the residual coding data can be decoded by the same decoding method, thereby reducing the complexity of the decoding end.

According to the present invention, the input audio signal is down-mixed to generate core audio data and residual data, the core audio data is encoded according to a predetermined encoding method, and the core audio data is encoded into a core audio object And outputs the encoded core audio data and the encoded residual data as a result of encoding the audio signal. By doing so, the core audio data and the residual data are encoded by the same encoding method And the complexity of the encoding stage can be reduced.

For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Similar reference numerals have been used for the components in describing each drawing.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 is a block diagram illustrating an apparatus for decoding a multi-channel audio signal according to an embodiment of the present invention.

1, an apparatus for decoding a multi-channel audio signal includes a demultiplexing unit 100, a spatial extension data type detecting unit 110, a core audio object type detector 110, detecting unit 120, a core audio data decoding unit 130, a residual coding data decoding unit 140, an arbitrary down-mix residual coded data decoding unit 140, a residual coding data decoding unit 150, and an up-mixing unit 160.

The demultiplexer 100 receives the bitstream from the encoder through the input terminal IN and demultiplexes the bitstream.

2 is a diagram illustrating a syntax for detecting a spatial extension data type according to an embodiment of the present invention. Fig. 3 is a diagram showing an embodiment of a table to which values corresponding to "bsSacExtType" shown in Fig. 2 are assigned. Hereinafter, the operation of the extended spatial data type detection unit 110 will be described with reference to FIG. 1 to FIG.

The spatial extension data type detection unit 110 detects the type of spatial extension data in the header of the demultiplexed data in the demultiplexing unit 100. More specifically, the spatial extension data type detection unit 110 can detect the type of the spatial extension data in the header of the data demultiplexed by the function SpatialExtensionConfig () shown in FIG. In the function SpatialExtensionConfig (), "bsSacExtType" indicates the type of space extension data.

3, if 'bsSacExtType' is '0', the spatial extension data is residual coding data, and if 'bsSacExtType' is '1', the spatial extension data is an arbitrary downmix register Quot; bsSacExtType "is " 12 ", the spatial extension data is the core audio object type of MPEG-4 audio. Here, the core audio object type refers to an audio object type for encoding a downmixed signal at an encoding end. However, it is to be understood that this is only an embodiment of the present invention, and that those skilled in the art will understand that various modifications are possible.

In other words, when the space extension data type detecting unit 110 determines that the type of the space extension data is the residual coding data when '0' is assigned to 'bsSacExtType' and '1' is assigned to 'bsSacExtType' It is determined that the type of the data is the bit rate downmix residual coded data. When "12" is assigned to "bsSacExtType", it is determined that the type of the spatial extension data is data indicating the core audio object type of MPEG-4 audio.

Hereinafter, the operation of the apparatus for decoding an audio signal according to the spatial extension data type detected by the spatial extension data type detection unit 110 will be described.

First, a case where the spatial extension data type detected by the spatial extension data type detection unit 110 is data representing a core audio object type of MPEG-4 audio will be described. In other words, in this case, "bsSacExtType" is "12".

4 is a diagram illustrating a syntax for reading a core audio object type according to an embodiment of the present invention. Hereinafter, the operation of the core audio object type detecting unit 120 will be described with reference to FIGS.

If it is determined that the spatial extension data is the data indicating the core audio object type of MPEG-4 audio as a result of the detection of the type of the spatial extension data in the spatial extension data type detection unit 110, The object type is detected.

More specifically, the core audio object type detection unit 120 can read the core audio object type according to the function "SpatialExtensionConfigData (12)" shown in FIG. Here, "coreAudioObjectType" indicates a core audio object type of MPEG-4 audio.

Referring again to FIG. 1, the core audio data decoding unit 130 decodes the demultiplexed core audio data in the demultiplexer 100. [ More specifically, the core audio data decoding unit 130 decodes the demultiplexed core audio data according to the core audio object type detected by the core audio object type detection unit 120. [

As described above, the core audio object type refers to an audio object type that encodes a downmixed signal at an encoding end. Here, the core audio data may be encoded by any of a variety of encoding schemes such as BSAC (Bit Sliced Arithmetic Coding), AAC (Advanced Audio Coding), MP3 (MPEG Audio Layer-3) Here, BSAC, AAC, MP3, and the like are only examples of the present invention. Those skilled in the art can understand that core audio data can be encoded by various encoding methods.

Second, a description will be made of a case where the spatial extension data type detected by the spatial extension data type detection unit 110 is residual coding data. In other words, "bsSacExtType" is '0' in this case.

5 is a diagram illustrating a syntax for decoding residual coding data according to an embodiment of the present invention. Hereinafter, the operation of the residual coding data decoding unit 140 will be described with reference to FIGS. 1 and 5. FIG.

The residual coding data decoding unit 140 includes a first core audio object type determining unit 141, a first BSAC decoding unit 142 and a first AAC decoding unit 143 to decode the residual coding data .

When it is determined that the spatial extension data is the residual coding data as a result of detecting the type of the spatial extension data in the spatial extension data type detection unit 110, the first core audio object type determination unit 141 determines that the core audio object type is' BSAC &Quot;

Referring to FIG. 5, since '22' is assigned to the core audio object type of 'BSAC', the first core audio object type determination unit 141 determines that the coreAudioObjectType detected by the core audio object type detection unit 120 is' 22 '.

If the first core audio object type determination unit 141 determines that the core audio object type corresponds to 'BSAC', the first BSAC decoding unit 142 decodes the residual signal by 'BSAC'. For example, the first BSAC decoding unit 142 may be implemented by the identification number 500 or 520 of the syntax shown in FIG. At the identification number 500 or 520, the first BSAC decoding unit 142 decodes the residual coding data by the function bsac_raw_data_block () defined in the MPEG-4 ER BSAC. Here, "nch" of bsac_raw_data_block () should always be set to "1". Here, "nch" represents the number of channels (Number of Channels).

If the first core audio object type determining unit 141 determines that the core audio object type does not correspond to 'BSAC', the first AAC decoding unit 143 decodes the residual coding data by 'AAC'. For example, the first AAC decoding unit 143 may be implemented by the identification number 510 or 530 of the syntax shown in FIG. At the identification number 510 or 530, the first AAC decoding unit 143 performs residual coding on the basis of the individual_channel_stream (0) defined in the "MPEG-2 AAC Low Complexity profile bitstream syntax" described in subclause 6.3 of ISO / IEC 13818-7 Decodes the data.

However, 'AAC' in the first AAC decoding unit 143 is merely an embodiment. If it is determined in the first core audio object type determination unit 141 that the core audio object type does not correspond to 'BSAC' , The first AAC decoding unit 143 may decode the residual coding data using a decoding method corresponding to the core audio object type detected by the first core audio object type determination unit 141. [ For example, when the core audio object type detected by the first core audio object type determination unit 141 is 'MP3', the first AAC decoding unit 143 decodes the residual coding data by 'MP3'.

In this manner, the core audio data decoded by the core audio data decoding unit 130 is converted into a multi-channel signal using the residual coding data decoded by the first BSAC decoding unit 142 or the first AAC decoding unit 143 Can be mixed.

Third, a case where the spatial extension data type detected by the spatial extension data type detection unit 110 is the arbitrary down-mix residual coding data will be described. In other words, "bsSacExtType" is '1' in this case.

FIG. 6 is a diagram illustrating a syntax for decoding arbitrary downmix residual data according to an embodiment of the present invention. Referring to FIG. Hereinafter, the operation of the arbitrary down-mix residual coded data decoding unit 150 will be described with reference to FIGS. 1 and 6. FIG.

The downmix residual coded data decoding unit 150 includes a second core audio object type determining unit 151, a second BSAC decoding unit 152, and a second AAC decoding unit 153, And decodes the mixed residual coding data.

If the second core audio object type determining unit 151 determines that the core audio object type corresponds to 'BSAC', the second BSAC decoding unit 152 outputs the avatar down-mix residual coding data by 'BSAC' Decryption. For example, the second BSAC decoding unit 152 may be implemented by at least one of identification numbers 600, 620, 640, and 660 of the syntax shown in FIG. At least one of the identification numbers 600, 620, 640, and 660, the second BSAC decoding unit 152 decodes the arbitrary down-mix mixed-coded data according to the function bsac_raw_data_block () defined in the MPEG-4 ER BSAC . Here, "nch" of bsac_raw_data_block () should always be set to '1'. Here, "nch" represents the number of channels (Number of Channels).

If the first core audio object type determination unit 151 determines that the core audio object type does not correspond to 'BSAC', the second AAC decoding unit 152 outputs the avatar downmix residual coding data by 'AAC' Decryption. For example, the second AAC decoding unit 153 may be implemented by at least one of the identification numbers 610, 630, 650, and 670 of the syntax shown in FIG. At the identification number 610 or 650, the second AAC decoding unit 153 decodes the avatar lyre down (0) according to the individual_channel_stream (0) defined in the "MPEG-2 AAC Low Complexity profile bitstream syntax" described in subclause 6.3 of ISO / IEC 13818-7. And decodes the mixed residual coding data. In addition, in the identification number 630 or 670, the second AAC decoding unit 153 decodes the AITRELERI () by the channel_pair_element () defined in the "MPEG-2 AAC Low Complexity profile bitstream syntax" described in subclause 6.3 of ISO / IEC 13818-7 And decodes the downmix residual coding data. Here, the parameter "common_window" is set to " 1 ".

However, 'AAC' in the second AAC decoding unit 153 is merely one embodiment. If it is determined in the second core audio object type determination unit 151 that the core audio object type does not correspond to 'BSAC' And the second AAC decoding unit 153 can decode the avatar downmix residual coding data using the decoding method corresponding to the core audio object type detected by the second core audio object type determination unit 151. [ For example, when the core audio object type detected by the first core audio object type determination unit 151 is' MP3 ', the second AAC decoding unit 153 may output the avatar down-mix residual coding data' .

In this manner, the core audio data decoded by the core audio data decoding unit 130 is multiplexed with the multi-bit audio data using the avatarary downmix residual coding data decoded by the second BSAC decoding unit 152 or the second AAC decoding unit 153, It can be upmixed to a channel signal.

Fourth, the case where the spatial extension data type detected by the spatial extension data type detection unit 110 is not the data indicating the core audio object type of MPEG-4 audio, the residual coding data, or the arbitrary down mix residual coding data Let's look at it.

The spatial extension data decoding unit 160 performs decoding in a manner corresponding to the type of the spatial extension data detected by the spatial extension data type detection unit 110. [ In this manner, the core audio data decoded by the core audio data decoding unit 130 can be upmixed into the multi-channel signal by using the data decoded by the spatial extension data decoding unit 160. [

The upmixing unit 170 encodes the core audio data decoded by the core audio data decoding unit 130 into first and second BSAC decoding units 142 and 152, first and second ACC decoding units 143 and 153, Or up-mixes the result into a multi-channel signal using the result decoded by the spatial extension data decoding unit 160. Here, upmixing is a concept contrary to downmixing, in which a stereo signal of two or more channels is generated from a mono signal.

7 is a flowchart illustrating a method of decoding a multi-channel audio signal according to an embodiment of the present invention.

Referring to FIG. 7, the method for decoding a multi-channel audio signal according to the present embodiment is comprised of steps of time-series processing in the apparatus for decoding an audio signal shown in FIG. Therefore, the contents described above with respect to the audio signal decoding apparatus shown in FIG. 1 are also applied to the decoding method of the audio signal according to the present embodiment, even if omitted below.

In step 700, the spatial extension data type detection unit 110 detects the type of spatial extension data included in the encoding result of the audio signal.

In step 710, the core audio object type detection unit 120 detects the core audio object type if the spatial extension data is data indicating the core audio object type in which the core audio data is encoded.

In operation 720, the core audio data decoding unit 130 decodes the core audio data using a decoding method according to the detected core audio object type.

In step 730, if the spatial extension data is residual coding data, the residual coding data decoding unit 140 decodes the residual coding data using the decoding method according to the core audio object type.

In operation 740, the upmixing unit 170 upmixes the decoded core audio data using the decoded residual coding data.

In the method of decoding an audio signal according to the present embodiment, when the spatial extension data is Abbatial downmix residual coding data, the step of decoding the arbitrary downmix residual coding data using a decoding method according to the core audio object type . In this case, the upmixing unit 170 may upmix the decoded core audio data using the decoded residual coding data and the decoded avitreler downmix residual coding data.

In the method of decoding an audio signal according to the present embodiment, when the spatial extension data is data other than the data indicating the core audio object type, the residual coding data, and the arbitrary down mix coding data, And decrypting the space extension data by using the space expansion data. In this case, the upmixing unit 170 may upmix the decoded core audio data using the decoded residual coding data, decoded avitreray downmix residual coding data, and decoded space expansion data.

8 is a block diagram illustrating an apparatus for encoding a multi-channel audio signal according to an embodiment of the present invention.

8, an apparatus for encoding a multi-channel audio signal includes a down-mixing unit 800, a core audio data encoding unit 810, a residual data encoding unit 810, unit 820, an arbitrary down-mix residual data encoding unit 830, and a multiplexing unit 840.

The downmixing unit 800 downmixes the input signal IN. Here, the input signal IN may be a PCM (Pulse Code Modulation) signal obtained by modulating an analog audio signal or an audio signal into a digital signal. Here, downmixing is to generate mono signals of one channel from two or more stereo signals, and the amount of bits allocated to the encoding process can be reduced through downmixing.

The core audio data encoding unit 810 encodes the core audio data output from the downmixing unit 800 according to a predetermined encoding method. Here, the core audio data may be encoded by any of a variety of encoding schemes such as Bit Sliced Arithmetic Coding (BSAC), Advanced Audio Coding (AAC), and MPEG Audio Layer-3 (MP3). Here, BSAC, AAC, MP3, and the like are only examples of the present invention. Those skilled in the art can understand that core audio data can be encoded by various encoding methods.

The residual data encoding unit 820 includes a first core audio object type determining unit 821, a first BSAC encoding unit 822, and a first AAC encoding unit 822. [ , And 823 to encode residual data.

The first core audio object type determining unit 821 determines the encoding method of the residual data by determining the core audio object type which is a method of encoding the core audio data in the core audio data encoding unit 810. [ For example, if the core audio object type is 'BSAC', the first core audio object type determination unit 821 determines the encoding method of the residual data to be 'BSAC'. If the core audio object type is 'AAC' The encoding method of the residual data is determined to be 'AAC'.

The first BSAC encoding unit 822 encodes the residual data in the BSAC format when the core audio object type is 'BSAC' as a result of the determination by the first core audio object type determination unit 821. This makes it possible to reduce the complexity of the encoding stage by encoding the core audio data and the residual data in the same encoding scheme.

The first AAC encoding unit 823 encodes the residual data in the 'AAC' format when the core audio object type is 'AAC' as a result of the determination by the first core audio object type determination unit 821. This makes it possible to reduce the complexity of the encoding stage by encoding the core audio data and the residual data in the same encoding scheme.

However, 'AAC' in the first AAC encoding unit 823 is merely an embodiment. If it is determined in the first core audio object type determination unit 821 that the core audio object type does not correspond to 'BSAC' , The first AAC decoding unit 823 can encode the residual data using the encoding method corresponding to the core audio object type detected by the first core audio object type determining unit 821. [ For example, when the core audio object type detected by the first core audio object type determination unit 821 is 'MP3', the first AAC encoding unit 823 encodes the residual data by 'MP3'.

The downmix residual data encoding unit 830 includes a second core audio object type determining unit 831, a second BSAC encoding unit 832 and a second AAC encoding unit 833 to encode residual data, do.

The second core audio object type determining unit 831 determines the encoding method of the residual data by determining the core audio object type that is the method of encoding the core audio data in the core audio data encoding unit 810. [ For example, if the core audio object type is 'BSAC', the second core audio object type determination unit 831 determines that the residual data encoding method is 'BSAC'. If the core audio object type is 'AAC' The encoding method of the residual data is determined to be 'AAC'.

The second BSAC encoding unit 832 encodes the residual data in the BSAC format when the core audio object type is 'BSAC' as a result of the determination by the second core audio object type determination unit 831. [ This makes it possible to reduce the complexity of the encoding stage by encoding the core audio data and the residual data in the same encoding scheme.

The second AAC encoding unit 833 encodes the residual data in the 'AAC' format when the core audio object type is 'AAC', as a result of the determination by the second core audio object type determination unit 831. This makes it possible to reduce the complexity of the encoding stage by encoding the core audio data and the residual data in the same encoding scheme.

However, 'AAC' in the second AAC encoding unit 833 is merely one embodiment. If it is determined in the second core audio object type determination unit 831 that the core audio object type does not correspond to 'BSAC' , And the second AAC decoding unit 833 can encode the residual data using the encoding method corresponding to the core audio object type detected by the second core audio object type determining unit 831. [ For example, if the core audio object type detected by the second core audio object type determination unit 831 is 'MP3', the second AAC encoding unit 833 encodes the residual data by 'MP3'.

The multiplexing unit 840 multiplexes the result encoded by the first and second BSAC encoding units 822 and 832 and the encoded result of the first and second AAC encoding units 823 and 833 ) To generate a bitstream and output the bitstream to the output terminal OUT.

9 is a flowchart illustrating a method of encoding a multi-channel audio signal according to an embodiment of the present invention.

Referring to FIG. 9, a method of encoding a multi-channel audio signal according to an embodiment of the present invention includes steps of time series processing in the apparatus for encoding an audio signal shown in FIG. Therefore, even if omitted below, the contents described above with respect to the audio signal encoding apparatus shown in FIG. 8 are also applied to the audio signal encoding method according to the present embodiment.

In operation 900, the downmixing unit 900 downmixes the input audio signal to generate core audio data and residual data.

In step 910, the core audio data encoding unit 910 encodes the core audio data according to a predetermined encoding method.

In step 920, the residual data encoding unit 920 encodes the residual data according to a predetermined encoding scheme according to the core audio object type, which is a method in which the core audio data is encoded.

In operation 930, the multiplexer 940 multiplexes the encoded core audio data and the encoded residual data, and outputs the result as an encoding result for the audio signal.

In operation 900, the input audio signal may be downmixed to generate core audio data, residual data, and arbitrary downmix residual data. In this case, the method of encoding an audio signal according to the present embodiment may further include the step of encoding the arbitrary down-mix residual data according to a predetermined encoding method according to the core audio object type. In this case, the multiplexer 940 multiplexes the encoded core audio data, the encoded residual data, and the encoded avatar downmix residual data, and outputs the multiplexed result as a result of encoding the audio signal.

It is needless to say that the present invention is not limited to the above-described embodiments, and can be modified by those skilled in the art within the scope of the present invention.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage, And the like. The computer readable recording medium may also be distributed over a networked computer system and stored and executed as computer readable code in a distributed manner.

1 is a block diagram illustrating an apparatus for decoding a multi-channel audio signal according to an embodiment of the present invention.

2 is a diagram illustrating a syntax for detecting a spatial extension data type according to an embodiment of the present invention.

Fig. 3 is a diagram showing an embodiment of a table to which values corresponding to "bsSacExtType" shown in Fig. 2 are assigned.

4 is a diagram illustrating a syntax for reading a core audio object type according to an embodiment of the present invention.

5 is a diagram illustrating a syntax for decoding residual coding data according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a syntax for decoding arbitrary downmix residual data according to an embodiment of the present invention. Referring to FIG.

7 is a flowchart illustrating a method of decoding a multi-channel audio signal according to an embodiment of the present invention.

8 is a block diagram illustrating an apparatus for encoding a multi-channel audio signal according to an embodiment of the present invention.

9 is a flowchart illustrating a method of encoding a multi-channel audio signal according to an embodiment of the present invention.

Claims (24)

Detecting a type of spatial extension data included in the bitstream; Decoding core audio data by a decoding method according to a core audio object type; Decoding the residual coding data using a first decoding scheme when the spatial extension data is residual coding data; And And upmixing the decoded core audio data using the decoded residual coding data. ≪ Desc / Clms Page number 19 > The method according to claim 1, Further comprising the step of decoding the arbitrary down-mix mixed-coded data according to the decoding method according to the core audio object type when the spatial expansion data is the arbitrary down-mix residual coding data A method for decoding a channel audio signal. 3. The method of claim 2, The step of upmixing And upmixing the decoded core audio data using the decoded residual coding data or the decoded avitreary downmix residual coding data. 3. The method of claim 2, If the spatial extension data is data other than the data indicating the core audio object type, the residual coding data, and the arbitrary down mix coding data, the spatial expansion data is decoded by a decoding method according to the type of the spatial expansion data Further comprising the step of: decoding the multi-channel audio signal. 5. The method of claim 4, The step of upmixing And upmixing the decoded core audio data using the decoded residual coding data, the decoded avatareir downmix residual coding data, or the decoded spatial expansion data. Way. Detecting a type of spatial extension data included in an encoding result of the audio signal; Decoding the audio data using a decoding method according to a core audio object type; Decoding the residual coding data using a first decoding scheme when the spatial extension data is residual coding data; And And upmixing the decoded core audio data using the decoded residual coding data. The computer-readable recording medium according to claim 1, A spatial extension data type detection unit for detecting a type of spatial extension data included in an encoding result of an audio signal; A core audio data decoding unit decoding the core audio data by a decoding method according to a core audio object type; A residual coding data decoding unit decoding the residual coding data using a first decoding scheme when the spatial expansion data is residual coding data; And And an upmixing unit for upmixing the decoded core audio data using the decoded residual coding data. 8. The method of claim 7, Down mix residual coded data decoding unit for decoding the avatar downmix residual coded data according to the decoding method according to the core audio object type when the spatial extension data is the arbitrary down mix residual coded data, Channel audio signal of the multi-channel audio signal. 9. The method of claim 8, The upmixing unit And upmixing the decoded core audio data using the decoded residual coding data or the decoded avatar-down-mix residual coding data. 9. The method of claim 8, If the spatial extension data is data other than the data indicating the core audio object type, the residual coding data, and the arbitrary down mix coding data, the spatial expansion data is decoded by a decoding method according to the type of the spatial expansion data And a spatial extension data decoding unit for decoding the multi-channel audio signal. 11. The method of claim 10, The upmixing unit And upmixing the decoded core audio data using the decoded residual coding data, the decoded avatareir downmix residual coding data, or the decoded spatial expansion data. Device. Downmixing the input audio signal to generate core audio data and residual data; Encoding the core audio data according to a predetermined encoding scheme; Encoding the residual data according to the predetermined encoding scheme according to a core audio object type in which the core audio data is encoded; And And encoding the encoded core audio data and the encoded residual data into a bitstream together with information indicating that residual coding is applied. 13. The method of claim 12, The downmixing step Wherein the core audio data, the residual data, and the arbitrary down mix residual data are generated by downmixing the input audio signal. 14. The method of claim 13, Further comprising the step of encoding the arbitrary down-mix residual data according to the predetermined encoding scheme according to the core audio object type. 15. The method of claim 14, The bit stream And outputting the encoded core audio data, the encoded residual data, or the encoded arbitrary down mix residual data as a result of encoding the audio signal. Downmixing the input audio signal to generate core audio data and residual data; Encoding the core audio data according to a predetermined encoding scheme; Encoding the residual data according to the predetermined encoding scheme according to a core audio object type in which the core audio data is encoded; And And encoding the encoded core audio data and the encoded residual data into a bitstream together with information indicating that residual coding is applied. Recorded on a computer readable recording medium. A downmixing unit for downmixing an input audio signal to generate core audio data and residual data; A core audio data encoding unit for encoding the core audio data according to a predetermined encoding scheme; A residual data encoding unit for encoding the residual data according to the predetermined encoding scheme according to a core audio object type in which the core audio data is encoded; And And multiplexing the encoded core audio data and the encoded residual data into a bitstream together with information indicating that residual coding is applied. 18. The method of claim 17, The downmixing unit And generates the core audio data, the residual data, and the arbitrary down mix residual data by downmixing the input audio signal. 18. The method of claim 17, Further comprising an arbitrary down-mix residual data encoding unit for encoding the arbitrary down-mix residual data according to the predetermined encoding scheme according to the core audio object type. 20. The method of claim 19, The multiplexer And outputs the encoded core audio data, the encoded residual data, and the encoded arbitrary down mix residual data as a result of encoding the audio signal. Receiving a bitstream including a bitstream corresponding to a downmixed audio core signal and additional information for generating a multi-channel; Detecting a core object type from a bitstream corresponding to the downmixed audio core signal; Decoding the downmixed audio core signal by a decoding method determined by the detected core object type; Decoding the residual coding data using the decoding method according to the core audio object type if the spatial extension data included in the additional information for generating the multi-channel is residual coding data; And And upmixing the decoded core audio data using the decoded residual coding data. ≪ Desc / Clms Page number 19 > The method of claim 1, wherein the first decoding method is AAC. 8. The apparatus of claim 7, wherein the first decoding scheme is AAC. Decoding the downmixed mono signal; Decoding the residual signal by referring to information indicating whether residual coding is applied; Decoding the additional information for generating a plurality of channel signals from the decoded downmixed mono signal; And And restoring the plurality of channel signals by downmixed mono signals decoded using the decoded additional information and the decoded residual signals.

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