TWI412021B - Method and apparatus for encoding and decoding an audio signal - Google Patents

Abstract

A method and apparatus for encoding and decoding an audio signal are provided. The present invention includes receiving an audio signal including a downmix signal and a spatial information signal, if a header is included in the spatial information signal, extracting configuration information from the header, extracting spatial information included in the spatial information signal, and converting the downmix signal to a multi-channel signal using the configuration information and the spatial information. Accordingly, the header can be selectively included in the spatial information signal, thereby if the header is plurally included in the spatial information signal, it is able to decode spatial information in case of reproducing the audio signal from a random point.

Description

Audio signal decoding method

The present invention relates to an audio signal processing technique, and more particularly to an audio signal encoding and decoding method and apparatus therefor.

Generally, the audio signal encoding device compresses an audio signal into a mono or stereo type downmix signal instead of compressing each channel of the multi-channel audio signal. The audio signal encoding device transmits the compressed downmix signal to the same spatial information signal (or auxiliary data signal) to a decoding device, or stores the compressed downmix signal and the spatial information signal in a storage medium.

In this case, the spatial information signal extracted by the downmix multi-channel audio signal is used to recover an initial multi-channel audio signal from a compressed downmix signal.

The spatial information signal includes a header and a spatial information. Also, the configuration information is included in this header. The header is information used to explain spatial information.

An audio signal decoding device decodes the spatial information by using the configuration information included in the header, and the configuration information included in the header is transmitted to a decoding device or stored together with the spatial information in a storage medium.

An audio signal encoding device multiplexes a coded downmix signal and the spatial information signal together in the form of a bit stream, and then transmits the multiplex signal to a decoding device. Since the configuration information is usually unchanged, the header containing the configuration information is inserted into the one-bit stream once. Since the transmission configuration information is initially inserted into the audio signal, if the audio signal is copied from an arbitrary time point, the audio signal decoding device has a problem in decoding the spatial information because there is no configuration information. That is to say, if in the broadcast, on-demand video or the like, the audio signal decoding device cannot be used in the audio because the audio signal is copied from a specific time point by the user's request instead of being copied by the initial portion. Configuration information transmitted in the signal. Thus, spatial information cannot be decoded.

In view of the above problems, the main object of the present invention is to provide an audio signal encoding and decoding method and apparatus thereof, which can be selectively included in a frame of a spatial information signal, thereby being capable of decoding the audio signal. .

Another object of the present invention is to provide an audio signal encoding and decoding method and apparatus thereof, which can decode a plurality of headers by including a plurality of headers in a spatial information signal, thereby decoding the audio even if the audio signal is copied from a random point. Signal.

Therefore, in order to achieve the above objective, the audio signal decoding method disclosed in the present invention includes the following steps: receiving an audio signal including a downmix signal and a spatial information signal; if a header is included in the spatial information signal, the self-standard Extracting configuration information from the header; extracting spatial information contained in the spatial information signal; and converting the downmix signal into a multi-channel signal by configuring information and spatial information.

The features and implementations of the present invention are described in detail below with reference to the drawings.

In order to understand the present invention, prior to the audio signal decoding apparatus and method, an audio signal encoding apparatus and method are first explained. However, the decoding apparatus and method of the present invention are not limited to the following decoding apparatus and method thereof. Moreover, the present invention is applicable to an audio coding scheme for generating multi-channel using spatial information, and MP3 (MPEG 1/2-layer III) and Advanced Audio Coding (AAC).

FIG. 1 is a schematic diagram showing the structure of an audio signal according to an embodiment of the present invention, wherein an audio signal is transmitted from an audio signal encoding device to an audio signal decoding device.

Please refer to "FIG. 1". An audio signal includes an audio descriptor 101, a downmix signal 103 and a spatial information signal 105.

If an encoding scheme is used to copy the audio signal of a broadcast or the like, the audio signal may include auxiliary data as well as the audio descriptor 101 and the downmix signal 103. The present invention may include spatial information signal 105 as ancillary data. In order to enable the audio signal decoding device to understand the basic information of the audio codec without analyzing the audio signal, the audio signal may optionally include the audio descriptor 101. The audio descriptor 101 is composed of a small amount of basic information necessary for audio decoding, such as the transmission rate of the transmitted audio signal, the number of channels, the sampling frequency of the compressed data, the identifier of the currently used codec, and the like.

The audio signal decoding device can understand the type of the codec used by the audio signal by the audio descriptor 101. In particular, with the audio descriptor 101, the audio signal decoding device can know whether the received audio signal is a multi-channel signal recovered by the spatial information signal 105 and the downmix signal 103. At this time, the multi-channel can include a virtual three-dimensional surround and an actual multi-channel. By means of the three-dimensional surround technology, the audio signals having the combined spatial information signal 105 and the downmix signal 103 are audible through one or more channels.

The positioning of the audio descriptor 101 is independent of the downmix signal 103 or the spatial information signal 105 included in the audio signal. For example, the audio descriptor 101 is positioned in a separate area for displaying the audio signal.

If the header is not provided to the downmix signal 103, the audio signal decoding device can decode the downmix signal 103 using the audio descriptor 101.

The downmix signal 103 is a signal generated from multi-channel downmixing. The downmix signal 103 can be generated from a downmixing unit (not shown) included in the audio signal decoding device (not shown) or manually generated.

The downmix signal 103 can be classified into one of the groups containing the spatial information signal 105 or not within one of the headers.

If the downmix signal 103 contains a header, the header is included in each frame by a frame unit. If the downmix signal 103 does not contain a header, as described above, the downmix signal 103 can be decoded using an audio descriptor 101 by an audio signal decoding device. The downmix signal 103 either has the form of including a header for each box, or has a form that does not include a header. Moreover, the downmix signal 103 is included in an audio signal in the same manner until the content ends.

The spatial information signal 105 can also be classified into one of the groups containing the header and spatial information, and only the one containing the spatial information does not include the header. The header of the spatial information signal 105 is distinguished from the header of the downmix signal 103 because it is not necessarily inserted into the respective frames identically. In particular, the spatial information signal 105 can simultaneously use a frame containing a header and a frame containing no header. Most of the information contained in the header of the spatial information signal 105 is configuration information, which interprets spatial information to decode spatial information.

FIG. 2 is a schematic diagram showing the structure of an audio signal according to another embodiment of the present invention, wherein the audio signal is transmitted from an audio signal encoding device to an audio signal decoding device.

Please refer to "Figure 2". An audio signal includes a downmix signal 103 and a spatial information signal 105. Also, the audio signal exists in the form of a basic bit stream (ES) arranged in a frame.

Each of the downmix signal 103 and the spatial information signal 105 is occasionally transmitted to an audio signal decoding device in the form of a separate basic bit stream. And as shown in FIG. 2, the downmix signal 103 and the spatial information signal 105 can be combined into a basic bit stream format for transmission to the audio signal decoding device.

If the downmix signal 103 and the spatial information signal 105 are combined into a basic bit stream format and transmitted to the audio signal decoding device, the spatial information signal 105 can be included in the auxiliary data or additional data (extended data) of the downmix signal 103. position.

Moreover, the audio signal may include signal identification information to indicate whether the spatial information signal 105 is combined with the downmix signal 103.

The frame of the spatial information signal 105 can be classified into a group including the header 201 and the spatial information 203, and only one of the spatial information 203. In particular, the spatial information signal 105 can simultaneously use a frame containing the header 201 and a frame that does not include the header 201.

In the present invention, the header 201 is inserted into the spatial information signal 105 at least once. In particular, the audio signal encoding apparatus may insert the header 201 in each frame of the spatial information signal 105, periodically insert the header 201 into each fixed interval of the frame of the spatial information signal 105, or insert the header non-periodically. 201 is in any arbitrary interval of the frame of the spatial information signal 105.

The audio signal may include information indicating whether the header 201 is included in the frame.

If the header 201 is included in the spatial information signal 105, the audio signal decoding device extracts the configuration information 205 from the header 201, and then decodes the spatial information 203 transmitted after the header 201 in accordance with the configuration information 205. Since the header 201 is information for decoding by interpreting the spatial information 203, the header 201 is transmitted at an earlier stage of the audio signal transmission.

If the header 201 is not included in the spatial information signal 105, the audio signal decoding apparatus decodes the spatial information 203 using the header 201 transmitted at an earlier stage.

If the header 201 is lost while the audio signal is transmitted from the audio encoding device to the audio decoding device, or if the audio signal transmitted in the form of a bit stream is decoded from the middle portion for broadcasting or the like, the audio signal decoding device The previously transmitted header 201 cannot be used. In this case, the audio signal decoding device extracts the configuration information 205 from the header 201, wherein the header 201 is different from the previous header 201 originally inserted into the audio signal, and can then be decoded using the extracted configuration information 205. This audio signal. At this time, the configuration information 205 extracted from the header 201 in the inserted audio signal may be identical to or different from the previous configuration information 205, wherein the previous configuration information 205 is extracted from the header 201 transmitted at an earlier stage.

If the header 201 is changed, the configuration information 205 can be extracted from a new header 201, the extracted configuration information 205 is decoded, and then the spatial information 203 transmitted after the header 201 is decoded. If the header 201 is unchanged, it is necessary to determine if the new header 201 is identical to the old header 201 previously transmitted. If the two headers 201 are different from each other, it is possible to detect an error occurring in the audio signal on the audio signal transmission path.

The configuration information 205 extracted from the header 201 of the spatial information signal 105 is information for interpreting the spatial information 203.

The spatial information signal 105 can include the following information (hereinafter referred to as time align information) for generating multiple channels by using the downmix signal 103 and the spatial information signal 105 by the audio signal decoding device. Distinguish the time delay deviation between the two signals.

The audio signal transmitted from the audio signal encoding device to the audio signal decoding device is parsed through a demultiplexing unit (not shown) and then separated into the downmix signal 103 and the spatial information signal 105.

The downmix signal 103 separated by the demultiplexing unit is decoded, and the decoded downmix signal 103 generates a multi-channel using the spatial information signal 105. When the multi-channel is generated by combining the downmix signal 103 and the spatial information signal 105, the audio signal decoding device can adjust the synchronization of the two signals by using the time alignment information (not shown) included in the configuration information 205. The starting position and the like of the two signals are combined, wherein the configuration information 205 is extracted from the header 201 of the spatial information signal 105.

The time slot location information 207 is included in the spatial information 203 of the spatial information signal 105, one of which will be applied to this time slot. As a spatial parameter (spatial cue), there is a channel level deviation indicating an energy deviation between audio signals, indicating inter-channel correlations of intimacy and similarity of audio signals. , indicating channel prediction coefficents that use other signals to predict the coefficients of the audio signal values. In the following, each spatial tail or space tail bundle will be referred to as a parameter 〞.

If N parameters exist in the frame contained in the spatial information signal 105, the N parameters are respectively applied to the specific time slot positions of the respective frames. If the information indicating that the parameter is to be applied to one of the time slots included in the box is named as the time slot location information 207, the audio signal decoding apparatus uses the position information 207 of the time slot to which the parameter is applied to decode the space. Information 203. At this time, this parameter is included in the spatial information 203.

Fig. 3 is a block diagram of an audio signal decoding apparatus according to an embodiment of the present invention.

Referring to FIG. 3, an audio signal decoding apparatus according to an embodiment of the present invention includes a receiving unit 301 and an extracting unit 303.

The receiving unit 301 of the audio signal decoding device receives the audio signal transmitted in the form of a basic bit stream through an input terminal IN1 and through the audio signal decoding device.

The audio signal received by the audio signal decoding device includes an audio descriptor 101 and a downmix signal 103, and may further include a spatial information signal 105 as auxiliary data or additional data (extended data).

The extracting unit 303 of the audio signal decoding device extracts the configuration information 205 from the header 201 included in the received audio signal, and then outputs the extracted configuration information 205 through an output terminal OUT1.

The audio signal may include header identification information to identify whether the header 201 is included in a frame.

The audio signal decoding device identifies the header 201 by including the header identification information included in the audio signal. If the header 201 is included therein, the audio signal decoding device extracts the configuration information 205 from the header 201. In the present invention, at least one header 201 is included in the spatial information signal 105.

Figure 4 is a block diagram of an audio signal decoding apparatus according to another embodiment of the present invention.

Referring to FIG. 4, the audio signal decoding apparatus according to another embodiment of the present invention includes a receiving unit 301, a demultiplexing unit 401, a core decoding unit 403, a multi-channel generating unit 405, a spatial information decoding unit 407, and an extraction unit. Unit 303.

The receiving unit 301 of the audio signal decoding device receives an audio signal transmitted in the form of a bit stream from an audio signal encoding device by means of an output terminal IN2. Moreover, the receiving unit 301 sends the received audio signal to the demultiplexing unit 401.

The audio signals transmitted by the demultiplexing unit 401 and the receiving unit 301 are a coded downmix signal 103 and an encoded spatial information signal 105. The demultiplexing unit 401 transmits the coded downmix signal 103 separated from the bit stream to the core decoding unit 403, and transmits the coded spatial information signal 105 separated from the bit stream to the extracting unit 303.

The code downmix signal 103 is decoded by the core decoding unit 403 and then transmitted to the multi-channel generating unit 405. The coded space information signal 105 includes a header 201 and spatial information 203.

If the header 201 is included in the encoded spatial information signal 105, the extraction unit 303 extracts the configuration information 205 from the header 201. The extracting unit 303 can distinguish the presence of the header 201 by the header identification information included in the audio signal. In particular, the header identification information may indicate whether the header 201 is included in the frame included in the spatial information signal 105. The header identification information may indicate the order of the frames or the sequence of bits of the audio signal. If the header 201 is included in the frame, the configuration information 205 extracted from the header 201 is included in the frame order or the sequence of bits.

By the header identification information, if the judgment header 201 is included in the frame, the extraction unit 303 extracts the configuration information 205 from the header 201 included in the frame. The extracted configuration information 205 is then decoded.

The spatial information decoding unit 407 decodes the spatial information 203 included in the frame in accordance with the decoded configuration information 205.

Moreover, the multi-channel generating unit 405 uses the decoded downmix signal 103 and the decoded spatial information 203 to generate a multi-channel signal, and then outputs the generated multi-channel signal through an output terminal OUT2.

FIG. 5 is a flowchart of an audio signal decoding method according to an embodiment of the present invention.

Referring to FIG. 5, an audio signal decoding device receives the spatial information signal 105, wherein the spatial information signal 105 is transmitted by the audio signal encoding device in the form of a bit stream (step 501).

As described above, the spatial information signal 105 can be classified as a group of bit streams that are independent of the downmix signal 103, or classified as a group that is transmitted together with the downmix signal 103.

The audio signal multiplexing unit 401 separates the received audio signals into a coded downmix signal 103 and a coded spatial information signal 105. The coded space information signal 105 includes a header 201 and spatial information 203. If the header 201 is included in the frame of the spatial information signal 105, the audio signal decoding device recognizes the header 201 (step 503).

The audio signal decoding device extracts the configuration information 205 from the header 201 (step 505).

And, the audio signal decoding apparatus uses the extracted configuration information 205 to decode the spatial information 203 (step 507).

FIG. 6 is a flowchart of an audio signal decoding method according to another embodiment of the present invention.

Referring to FIG. 6, an audio signal decoding apparatus receives the spatial information signal 105, wherein the spatial information signal 105 is transmitted by the audio signal encoding apparatus in the form of a bit stream (step 501).

As described above, the spatial information signal 105 can be classified into one group of stream transmissions independent of the downmix signal 103, or classified as one of the auxiliary data or extension data included in the downmix signal 103. .

The audio signal multiplexed by the demultiplexing unit 401 of the audio signal is the encoded downmix signal 103 and the encoded spatial information signal 105. The coded space information signal 105 includes a header 201 and spatial information 203. The audio signal decoding device judges whether or not the header 201 is included in the frame (step 601).

If the header 201 is included in the frame, the audio signal decoding device recognizes the header 201 (step 503).

The audio signal decoding device then extracts the configuration information 205 from the header 201 (step 505).

The audio signal decoding device determines whether the configuration information 205 extracted from the header 201 is the configuration information 205 extracted from the first header 201 included in the spatial information signal 105 (step 603).

If the configuration information 205 is extracted from the header 201 first extracted by the audio signal, the audio signal decoding device decodes the configuration information 205 (step 611), and decodes the configuration information 205 according to the decoding configuration information 205. Spatial information 203.

If the header 201 extracted from the audio signal is not the header 201 first extracted from the spatial information signal 105, the audio signal decoding device determines whether the configuration information 205 extracted from the header 201 is equivalent to the group extracted from the first header 201. State information 205 (step 605).

If the extracted configuration information 205 is equivalent to the configuration information 205 extracted from the first header 201, the audio signal decoding device utilizes the decoded configuration information 205 extracted from the header 201 to decode the spatial information 203.

If the extracted configuration information 205 is different from the configuration information 205 extracted from the first header 201, the audio signal decoding device determines whether an error occurs in the audio signal from the audio signal encoding device to the audio signal decoding device. (Step 607).

If the configuration information 205 is changed, even if the configuration information 205 is different from the configuration information 205 extracted from the first header 201, the above error does not occur. Therefore, the audio signal decoding apparatus updates the header 201 to the new header 201 (step 609). The audio signal decoding device then decodes the configuration information extracted from this update header 201 (step 611).

According to the decoding configuration information 205, the audio signal decoding device decodes the spatial information 203 transmitted after the configuration information 205.

If the configuration information 205 is unchanged and different from the configuration information 205 extracted from the first header 201, it indicates that an error will occur on the audio signal transmission path. Therefore, the audio signal decoding apparatus removes the spatial information 203 included in the frame, wherein the spatial information 203 contains the error configuration information 205, or corrects the error of the spatial information 203 (step 613).

FIG. 7 is a flowchart of an audio signal decoding method according to still another embodiment of the present invention.

Referring to FIG. 7, an audio signal decoding device receives the spatial information signal 105, wherein the spatial information signal 105 is transmitted by the audio signal encoding device in the form of a bit stream (step 501).

The audio signal demultiplexing unit 401 separates the received audio signals into a coded downmix signal 103 and a decoded spatial information signal 105. At this time, the location information 207 of the time slot indicated by the parameter is included in the spatial information signal 105.

The audio signal decoding device extracts the position information 207 of the time slot from the spatial information 203 (step 701).

The audio signal decoding device uses the location information of the extracted time slot to adjust the time slot location to which a parameter is to be applied to apply the parameter to the corresponding time slot (step 703).

Figure 8 is a flow chart showing a method for obtaining location information indicating the number of time slots according to an embodiment of the present invention. The location information indicating the number of time slots is the number of bits allocated to indicate the location information 207 of the time slot.

The position information indicating the number of time slots can be found by the following steps, wherein a first parameter is applied to the time slot: the number of the time slot is subtracted from the number of time slots, and the result is increased by 1 to the subtraction result. For the base logarithm, and apply a ceil function to this logarithmic value. In particular, the location information indicating the number of time slots to which the first parameter is applied can be obtained by the formula ceil(log2(k-i+1)), where 〞k〞 and 〞i〞 respectively represent the number of time slots and the number of parameters.

Assumed that "N" is a natural number, it said applications are (N + 1) ^th number of time slot position information of the parameters is represented as a position where the application of the N ^th time slot of the parameter information 207. At this time, the location information 207 of the time slot to which the N ^th parameter is applied can be found by the following steps, that is, the time slot between the time slot in which the N ^th parameter is applied and the time slot in which the (N-1) ^th parameter is applied. The number is increased to the position information of the time slot applied by the (N-1) ^th parameter, and 1 is added to this added value (step 801). In particular, the position information of the time slot applied by the (N+1) ^th parameter can be obtained by the formula j(N)+r(N+1)+1, where r(N+1) indicates that the application exists (N) + 1) ^th time slot, and application with a number of parameters of the time slot between the time slot of the N ^th parameter.

If the location information 207 of the time slot applied by the N ^th parameter is found, then the number of time slot location information can be obtained to indicate the time slot location to which the (N+1) ^th parameter is applied. Specifically, by subtracting the number of parameters applied to a frame from the number of time slots and the time slot position information to which the N ^th parameter is applied, and increasing (N+1) to the subtraction value, the time slot information indicating the number can be found. To indicate the time slot location of the (N+1) ^th parameter application. In particular, by using the formula ceil(log2(k-i+N+1-j(N))), it is possible to find the position information of the number of time slots to which the (N+1) ^th parameter is applied, where 〞k〞, 〞i 〞 and 〞j(N)〞 represent the number of time slots, the number of parameters, and the position information 205 of the time slot indicated by the N ^th parameter, respectively.

If the location information indicating the number of time slots is obtained in the above manner, it means that the location information of the number of time slots to which the (N+1) ^th parameter is applied has the number of allocation bits inversely proportional to 〞N〞. That is, according to 〞N〞, the position information indicating the number of time slots to which the (N+1) ^th parameter is applied is a change value.

FIG. 9 is a flowchart of an audio signal decoding method according to still another embodiment of the present invention.

An audio signal decoding device receives an audio signal from an audio signal encoding device (step 901). The audio signal includes an audio descriptor 101, a downmix signal 103, and a spatial information signal 105.

The audio signal decoding device extracts the audio descriptor 101 included in the audio signal (step 903). An identifier indicating one of the audio codecs is included in this audio description 101.

The audio signal decoding device further recognizes that the audio signal includes the downmix signal 103 and the spatial information signal 105 by using the audio descriptor 101. In particular, the audio signal decoding device utilizes the spatial information signal 105 to distinguish the transmitted audio signal into a signal for generating a plurality of channels (step 905).

Moreover, the audio signal decoding device converts the downmix signal 103 into a multi-channel signal by using the spatial information signal 105. As described above, the header 201 can be included in the spatial information signal 105 at various predetermined intervals.

Industrial application

As described above, the audio signal encoding and decoding method and apparatus of the present invention enable a header to be selectively included in a spatial information signal.

Moreover, if the plurality of headers are included in the spatial information signal, the audio signal encoding and decoding method and apparatus of the present invention can decode the spatial information, even if the audio signal is copied from any point through the audio signal decoding device.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The patent protection scope of the invention is subject to the definition of the scope of the patent application attached to the specification.

101. . . Audio descriptor

103. . . Downmix signal

105. . . Spatial information signal

201. . . Header

203. . . Spatial information

205. . . Configuration information

207. . . Time slot location information

301. . . Receiving unit

303. . . Extraction unit

401. . . Demultiplexing unit

403. . . Core decoding unit

405. . . Multi-channel generating unit

407. . . Spatial information decoding unit

IN1. . . Input terminal

IN2. . . Output terminal

Step 501: receiving spatial information signals

Step 503 identifies the header

Step 505 Extract configuration information

Step 507 Decoding spatial information

Step 601‧‧ Have a header?

Step 603‧‧‧ Is the configuration information extracted from the first header?

Step 605‧‧‧ Is the extracted configuration information equivalent to the configuration information extracted from the first header?

Step 607‧‧‧Detected an error?

Step 609‧‧‧Update header

Step 611‧‧‧Decoding configuration information

Step 701‧‧‧ Extract the location information of the time slot

Step 703‧‧‧ Apply parameters to the time slot

Step 801‧‧‧ Get the position information of the time slot to which the N ^th parameter is applied

Step 803‧‧‧ obtain location information indicating the number of time slots to which the (N+1) ^th parameter is applied

Step 901‧‧‧ Receive audio signal

Step 903‧‧‧ Extract audio descriptor

Step 905‧‧‧Recognize whether the audio signal generates multiple channels by spatial information signal

1 is a schematic structural diagram of an audio signal according to an embodiment of the present invention;

2 is a schematic structural diagram of an audio signal according to another embodiment of the present invention;

3 is a block diagram of an audio signal decoding apparatus according to an embodiment of the present invention;

4 is a block diagram of an audio signal decoding apparatus according to another embodiment of the present invention;

FIG. 5 is a flowchart of an audio signal decoding method according to an embodiment of the present invention;

FIG. 6 is a flowchart of an audio signal decoding method according to another embodiment of the present invention;

FIG. 7 is a flowchart of an audio signal decoding method according to still another embodiment of the present invention;

Figure 8 is a flow chart showing a method for obtaining position information of a quantity according to an embodiment of the present invention;

FIG. 9 is a flowchart of an audio signal decoding method according to still another embodiment of the present invention.

103. . . Downmix signal

105. . . Spatial information signal

201. . . Header

203. . . Spatial information

205. . . Configuration information

207. . . Time slot location information

Claims (8)

An audio signal decoding method includes: receiving an audio signal and a header identification information, wherein the header identification information indicates whether a header is included in an auxiliary signal, and the audio signal includes a downmix signal ( Downmix signal) and the auxiliary signal; according to the header identification information, when the header is included in the auxiliary signal, extracting a configuration information of the header; and decoding the audio signal based on the configuration Information; wherein the configuration information includes at least one of time align information and a position information of a time slot; when the auxiliary signal embedded in the downmix signal is transmitted And the time alignment information indicates a time delay between the auxiliary signal and the downmix signal. The audio signal decoding method of claim 1, wherein the auxiliary signal comprises at least one header, and the at least one header is in each preset time or a spatial interval. The audio signal decoding method of claim 1, wherein the auxiliary signal indicates a spatial information signal. The audio signal decoding method of claim 3, further comprising: applying a parameter by using the location information of the pair of time slots in the spatial information signal, the parameter being included in the spatial information corresponding to the time slot In the signal. The audio signal decoding method of claim 3, wherein the audio signal comprises a signal identification information, and the signal identification information indicates whether the spatial information signal is combined with the downmix signal. The audio signal decoding method of claim 1, further comprising: using the time alignment information to identify a starting position of a frame of the auxiliary signal. An audio signal decoding method includes: receiving an audio signal and a header identification information, wherein the header identification information indicates whether a header is included in an auxiliary signal, and the audio signal includes a downmix signal and the auxiliary signal; And decoding, according to the header identification information, when the first header is not included in the auxiliary signal, decoding the audio signal based on the configuration information of a second header, the second header being transmitted to the first header The configuration information includes at least one of a time alignment information and a position information of a time slot; when the auxiliary signal embedded in the downmix signal is transmitted, the time alignment information is displayed. A time delay between the auxiliary signal and the downmix signal. An apparatus for decoding audio, comprising: a receiving unit, receiving an audio signal and a header identification information, wherein the header identification information indicates whether a header is included in an auxiliary signal, and the audio signal includes a downmix signal and The auxiliary signal; An extracting unit, according to the header identifying information, when the header is included in the auxiliary signal, the extracting unit extracts a configuration information from the header; a multi-channel generating unit that decodes the audio signal based on the configuration information; The configuration information includes at least one of a time alignment information and a location information of a time slot; when the auxiliary signal embedded in the downmix signal is transmitted, the time alignment information indicator is located between A time delay between the auxiliary signal and the downmix signal.