KR20180058164A - Apparatus and method for bitstream formatting for acoustic data transmission - Google Patents

Abstract

According to an embodiment of the present invention, a method of generating a bitstream performed by an ADT encoder is provided. The method includes: a step of receiving a first audio signal; a step of converting additional information into a bitstream and receiving the bitstream; and a step of transmitting a second audio signal, in which the bitstream is inserted into the first audio signal, to an ADT decoder.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method and apparatus for generating a bitstream for transmitting sound data,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bitstream generating method and apparatus for transmitting audio data, and more particularly, to a bitstream formatting method and apparatus inserted in an audio signal for transmission of additional information.

Acoustic data transmission (ADT) consists of an encoder for inserting additional information into an audio signal and a decoder for extracting inserted additional information.

There has been a problem in that the transmission of the additional information by the acoustic data transmission technology causes distortion in the acoustic channel and fails to be transmitted effectively.

Therefore, converting the additional information into a bit stream is necessary for resolving distortion in the audio channel and for transmitting effective additional information.

The present invention proposes a bit stream structure and related bit stream of acoustic data to be inserted into an audio signal for the transmission of additional information in a sound channel.

The present invention proposes a method of synchronizing a bit stream to output additional information through a bit stream of an audio signal in which sound data is embedded.

The present invention proposes a bitstream structure for effectively transmitting additional information and effectively compensating for distortion in an audio channel.

According to an embodiment of the present invention, there is provided a method of generating a bitstream performed by an ADT encoder, the method comprising: receiving a first audio signal; Converting the additional information into a bitstream and receiving the bitstream; And transmitting a second audio signal in which the bitstream is inserted to the first audio signal, to an ADT decoder.

The bitstream may be a bitstream generation method of generating a text-type bitstream in which the inserted side information is text information and transmits text information.

The bitstream may be a bitstream generation method for generating a table index type bitstream in which the inserted additional information is table index information and transmits table index information.

The bitstream may be a bitstream generation method for generating a time information type bitstream in which the inserted additional information is time information of a content and transmits time information.

According to an embodiment of the present invention, there is provided a bitstream reproducing method performed by an ADT decoder, the method comprising: receiving a second audio signal from an ADT encoder in which additional information converted into a bitstream is inserted into a first audio signal; Extracting a bit stream from the second audio signal; And converting the extracted bit stream to reproduce additional information.

The bitstream may be a bitstream reproducing method for reproducing a text-type bitstream in which the inserted additional information is text information and transmits text information.

The bitstream may be a bitstream reproduction method for reproducing the table index type bitstream in which the inserted additional information is table index information and transmits table index information.

The bitstream may be a bitstream reproduction method for reproducing the time information type bitstream in which the inserted additional information is time information of the content and transmits time information.

According to an embodiment of the present invention, there is provided an apparatus for generating a bitstream, the apparatus comprising: a processor; a processor for receiving a first audio signal, converting the additional information into a bitstream for reception, And transmits the second audio signal in which the bitstream is inserted to the first audio signal to the ADT decoder.

The bitstream may be a bitstream generation device that generates a text-type bitstream in which the inserted side information is text information and transmits text information.

The bitstream may be a bitstream generation device that generates a table index type bitstream in which the inserted additional information is table index information and transmits table index information.

The bitstream may be a bitstream generation device for generating a time information type bitstream in which the inserted additional information is time information of a content and transmits time information.

According to an embodiment of the present invention, there is provided a bitstream reproducing apparatus, wherein the bitstream reproducing apparatus includes a processor, and the processor includes: a second audio signal From the ADT encoder, extracts a bit stream from the second audio signal, and transforms the extracted bit stream to reproduce additional information.

The bitstream may be a bitstream reproducing apparatus that reproduces a text-type bitstream in which the inserted additional information is text information and transmits text information.

The bitstream may be a bitstream reproducing apparatus that reproduces a table index type bitstream in which the inserted additional information is table index information and transmits table index information.

The bitstream may be a bitstream reproduction apparatus for reproducing the time information type bitstream in which the inserted additional information is time information of the content and transmits time information.

According to an embodiment of the present invention, it is possible to suggest a bitstream structure and related bitstream of sound data to be inserted into an audio signal for transmission of additional information in a sound channel.

According to an embodiment of the present invention, a method of synchronizing a bit stream may be proposed in order to output additional information through a bit stream of an audio signal in which sound data is embedded.

According to an embodiment of the present invention, it is possible to propose a bitstream structure for effectively transmitting additional information and effectively compensating for distortion in an audio channel.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram of an overall process in accordance with an embodiment of the present invention.
FIG. 2 is a diagram showing a structure of a text type bitstream according to an embodiment of the present invention.
3 is a diagram illustrating the structure of a table index type bitstream according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a structure of a time code type bitstream according to an embodiment of the present invention.
5 is a diagram showing a syntax of an adt_data_extractor as an embodiment of the present invention.
FIG. 6 is a view illustrating definition of payload_available according to an embodiment of the present invention.
7 is a diagram showing a syntax of preamble_sync as an embodiment of the present invention.
8 is a diagram showing a syntax of adt_data_frame according to an embodiment of the present invention.
9 is a diagram illustrating an example of a Type of info bitstream structure for a table type ({001}) according to an embodiment of the present invention.
FIG. 10 is a diagram showing a syntax of a GetTextHeader according to an embodiment of the present invention.
11 is a diagram showing a syntax of a GetTableHeader according to an embodiment of the present invention.
12 is a diagram showing a syntax of a TextPayloadData according to an embodiment of the present invention.
13 is a diagram showing Syntax of TablePayloadData as an embodiment of the present invention.
14 is a diagram showing a syntax of a Timecode PayloadData as an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram of an overall process in accordance with an embodiment of the present invention.

Acoustic data transmission (ADT) can effectively prevent transmission of additional information and distortion in an acoustic channel. The ADT technology consists of an encoder technology for inserting acoustic data into an audio signal and a decoder technology for extracting acoustic data.

Acoustic data refers to a type in which additional information is converted into a bit stream to be inserted into an audio signal. That is, the sound data means a type in which the additional information is converted into a bit stream for transmission through the sound channel.

There are two types of additional information. The first type includes additional information expressed as a bit stream such as text data, a table index, time code data, and the like. The first type of side information can be embedded in the audio signal. The second type has additional information represented by index data for content identification. The second type of side information can be generally extracted from the audio signal.

The ADT encoder 101 can generate the second audio signal 108 in which the additional information 103 converted into the bit stream is inserted into the first audio signal 104. [ At this time, the inserted additional information 103 should minimize the deterioration of the sound quality of the first audio signal 104. [

The second audio signal 108 may be output via an output device 109, such as a speaker. The acoustic channel may refer to a physical space between the input device 110 and the output device 109 to which the second audio signal 108 is transmitted. The distortion occurring in the acoustic channel may be noise distortion and reverberation distortion. Noise distortion is distortion caused by ambient noise, and reverberation distortion is distortion due to reflections. The additional information 103 must be able to withstand distortion in the acoustic channel.

The second audio signal 108 may be input to the ADT decoder 102 via an input device 110, such as a microphone. The ADT decoder 102 can extract a bit stream from the second audio signal and convert it into the additional information 105. [ That is, the sound data is extracted by the ADT decoder 102 in a bitstream structure, and the configuration may be different depending on the type of the additional information. This is because the format of the sound data transmitted from the extracted bit stream structure can be known.

FIG. 2 is a diagram showing a structure of a text type bitstream according to an embodiment of the present invention.

The text type bit stream 200 may include an area for performing synchronization 210, an area for a header 220, and an area for payload 230.

The synchronization field 210 may include preamble data. The preamble data 211 can use a random binary code having a high degree of autocorrelation as promised code information at a transmitting / receiving end.

The length of the codeword of the sound data is defined as 7 bits, and each codeword can define a 4-bit cyclic redundancy check (CRC) code. The CRC code 240 is a method for checking whether there is an error in the data transmitted through the communication link. The CRC code 240 may use the following equation (1).

The text type has the highest degree of freedom among the additional information transmitted through the ADT encoder 101. Text information can be expressed in ASCII code, and text information of all combinations can be transmitted.

The header 220 includes a Type of info 221, a Payload Size 222, of Characters (223). The type of info 221 may indicate the type of additional information. That is, the type of the additional information may be identified through the Type of info 221, which is a text type.

The header 220 area may include a payload size 222 indicating a size of an area of a bitstream including text data. The acoustic data of the text type can be set in consideration of the size of the text transmitted by the payload size (222). The length information of the text is used to set the payload size (222). of Characters < RTI ID = 0.0 > (223). < / RTI >

The header 220 is a field for indicating the length information of the text. of Characters (223). That is, the standard of the acoustic data of the text type is No. of Characters (223).

The Payload Size (222) indicates the size of the audio data of the text type. of Characters < RTI ID = 0.0 > (223). < / RTI > One codeword can be composed of 7 bits according to the ASCII code length in the specification of the acoustic data of the text type. The length of the CRC code 240 is 4 bits for a 7-bit codeword, and it is possible to determine the error / non-existence of each codeword (i.e., ASCII code).

Likewise, No. of Characters (223) is also 7 bit. Therefore, the maximum number of types of characters that can be transmitted in one payload is 127. Alternatively, the number of types of characters that can be transmitted in one payload may be a maximum of 127.

The data of the individual fields constituting the header 220 area can be repeatedly transmitted. That is, it is for transmitting the information contained in the header 220 safely, and is set in consideration of a bit error occurring when transmitting through the sound channel.

3 is a diagram illustrating the structure of a table index type bitstream according to an embodiment of the present invention.

The table index type bitstream 300 may include an area for synchronization 310, an area for a header 320, and an area for a payload 330 .

The synchronization field 310 may include preamble data 311. The preamble data can use a random binary code having a high degree of autocorrelation as promised code information at the transmitting / receiving end.

The length of the codeword of the sound data is defined as 7 bits, and each codeword can define a 4-bit cyclic redundancy check (CRC) code. The CRC code 340 is a method for checking whether there is an error in data transmitted through the communication link. The CRC code 340 may use the following equation (2).

The table index type indicates a case where the transmitted additional information transmits a value of a specific table index. The header 320 field may include a Type of info field 321 indicating the type of the additional information. That is, the type of the additional information can be identified through the Type of info 321 field. The header 320 field may include a Payload Size field 322 indicating the size of the table index data.

A specific table index can be defined by the service provider. The user terminal can access predefined table data to provide additional services through various additional information. The Type of info (321) field specifies the breakdown for a particular table. The information on the specific table can be identified using the information in the Type of Table (323) field.

For example, in the case of the additional service using the table index, the web access URL information provided in association with the additional information may be constructed in advance as a table. At this time, when there are a plurality of table information, the web access URL information can be identified through the Type of Table (323). The table index information obtained in the payload 330 can be utilized to obtain URL information in the identified table.

Like the text type bit stream 200, the bits allocated to the table index 331 are 7 bits, and a total of 128 indexes can be transmitted. In addition, 7 types of tables are allocated to the Type of Table 323, so that up to 128 different table information can be constructed, and other table information can be utilized.

Data of the individual fields constituting the header 320 area can be repeatedly transmitted. That is, it is for transmitting the information contained in the header 320 safely, and is set in consideration of errors of bits generated when transmitting through the audio channel.

FIG. 4 is a diagram illustrating a structure of a time code type bitstream according to an embodiment of the present invention.

The time code type can be applied when the additional information to be transmitted is the time information of the content. The time code type bit stream 400 may include an area for performing synchronization 410, an area for managing a header 420, and an area for performing a payload 430 .

The synchronization field 410 may include preamble data 411. The preamble data can use a random binary code having a high degree of autocorrelation as promised code information at the transmitting / receiving end.

The length of the codeword of the sound data is defined as 7 bits, and each codeword can define a 4-bit cyclic redundancy check (CRC) code. The CRC code 440 is a method for checking whether there is an error in the data transmitted through the communication link. The CRC code 440 may use the following equation (3).

The header 420 field includes fields of Type of info 421 and Payload Size 422 fields. The type of info 421 may indicate the type of additional information. That is, the type of the additional information may be identified through the Type of info 421, which is a time code. The header 420 area may include a payload size 422 indicating the size of the bit stream area including the time code.

Unlike the text information and the table index information, one time code is hardly represented by only 7 bits. In one embodiment of the present invention, the time code may be configured by utilizing a total of 18 bits, which is obtained by adding 17 bits to a 1-bit reserved bit. That is, a total of 18 bits of code words will be transmitted as shown in Table 1 below.

City: 0 ~ 23 (5 bits) Min: 0 to 59 (6 bits) Seconds: 0 to 59 (6 bits)

Similar to the table index type bitstream 300, errors for 18 bits can be checked utilizing a 4-bit CRC code 440. [

The data of the individual fields constituting the header 420 area can be repeatedly transmitted. That is, it is for transmitting the information contained in the header 420 safely, and is set in consideration of an error of a bit occurring when transmitting through a sound channel

5 is a diagram showing a syntax of an adt_data_extractor as an embodiment of the present invention.

The PreambleLength 501 may indicate the bitstream length of the preamble data inserted in the beginning of the bitstream for synchronization. The bitstream length of the preamble data can be represented by a maximum of 34 bits.

The preamble_bits 502 may indicate preamble data. The preamble data is a complement bit string including {1,1,1,1} bits in the front and rear parts, and can be expressed as Equation (4).

The preamble_sync 503 is a function for verifying that the received preamble bit stream is valid. If the received preamble bitstream is valid, it looks for a synchronization bit stream. If the received preamble bit stream is valid, it means that no error has occurred in the bit stream while being transmitted through the audio channel.

The Adt_data_frame 504 indicates a function of the ADT data frame for receiving the transmitted valid data bit string when the synchronization for the preamble data is completed.

FIG. 6 is a view illustrating definition of payload_available according to an embodiment of the present invention.

The payload_available index has two values: TRUE or FALSE. If TRUE, bitstream synchronization may be completed. If FALSE, bitstream synchronization may be in progress.

Thus, completion of the bit stream synchronization completion may mean that a valid bit stream has been received. Also, the progress of the bitstream synchronization may mean that the valid bitstream is not received.

7 is a diagram showing a syntax of preamble_sync as an embodiment of the present invention.

Corr_rx_amble 701 is a coefficient indicating the degree of correlation between the received preamble data and the original preamble data. The value of Corr_rx_amble can be determined in the range of 0 to PreambleLength value.

Allowed_BER 702 is a value indicating the reliability of synchronization. The value of Allowed_BER 702 may be expressed as a value between 0 and 1. For example, if the BER of the received preamble data is allowed up to 20%, the value of Allowed_BER 702 may be set to 0.8. BER can mean Bit Error Rate.

The FastCrossCorrelation 703 is a function for obtaining a correlation between the received preamble data and the original preamble data. The function for obtaining the correlation is not defined separately, and can be implemented using a general correlation function. Also, the value of the correlation is in the range of the value of corr_rx_amble.

8 is a diagram showing a syntax of adt_data_frame according to an embodiment of the present invention.

The TypeInfo 801 is information included in the header area of the received bitstream. The Typeinfo 801 is a bitstream received to indicate which type of supplementary information the bitstream is, and can be represented by 3 bits.

The TypeinfoRepetition 802 is a constant indicating how many times the bitstream of the type of the additional information is transmitted repeatedly. TypeinfoRepetition (802) is not transmitted separately, but is a predefined constant. The default value of TypeinfoRepetition 802 is 7, meaning it can be transmitted 7 times.

The FixedHeaderCRC 803 is a CRC code value, which is fixedly received at 4 bits. PayloadSize 804 is an array variable for receiving information on the size of the payload. The GetBitsSum (A, B, C) 805 is a function that receives a repeatedly transmitted bitstream and calculates it as a valid information. At this time, A is the received bit stream, B is the number of repetitions of field data, and C is the number of bits of the field data. Payload Sizes 806 indicates the size of the bit stream allocated to the Payload, and indicates a size converted into a codeword in units of 11 bits.

TextTypeinfo 807 is a variable that defines a text type when the transmitted side information is a text type. TableTypeinfo 808 is a variable that defines the table index type when the transmitted side information is a table index type. The TimeCodeinfo 809 is a variable that defines a time code type when the transmitted side information is a time code type.

NumChar 810 is a variable indicating the byte length of valid text information when the transmitted additional information is a text type. The TableType 811 indicates information on a table type for indicating which index of the table is the transmitted table type information.

TextPayloadData (A, B) 812 is a function for loading the additional information transmitted in the text type, and A represents the payload size calculated by converting in units of 11 bits. In addition, B receives an effective length in bytes of text information as an argument. TablePayloadData (A) 813 indicates a function for loading the additional information transmitted in the table index type. At this time, A is converted into an 11-bit unit and receives the calculated payload size as an argument. TimecodePayloadData (A) 814 indicates a function for loading the additional information transmitted in the time code type. A is converted into 11-bit units and receives the calculated payload size as an argument.

9 is a diagram illustrating an example of a Type of info bitstream structure for a table type ({001}) according to an embodiment of the present invention.

The Type of info field may be configured as shown in FIG. 9 from Typeinfo 801 and TypeInfoRepetition 802 in FIG. That is, the information on the type of additional information is repeated seven times and transmitted in 21 bits. The CRC code is divided into 7 bits of information on the type of additional information. Information on the type of additional information can be obtained from Table 2 below.

TypeOfInfols Definition Index TypeOfInfols 000 TextTypeInfo 001 TableTypeInfo 010 TimeCodeInfo ... Reserved 111 Reserved

FIG. 10 is a diagram showing a syntax of a GetTextHeader according to an embodiment of the present invention.

NumCharSizeData 1001 is a syntax for receiving string length information of the transmitted text information. The transmitted bit stream is read repeatedly four times in 7-bit units. NumChar 1002 indicates a character string length of the transmitted additional information.

11 is a diagram showing a syntax of a GetTableHeader according to an embodiment of the present invention.

TableTypeData 1101 is a syntax for receiving transmitted table type information. The transmitted bit stream is obtained by repeating 4 times in units of 7 bits. TableType (1102) is a variable indicating the transmitted table type.

12 is a diagram showing a syntax of a TextPayloadData according to an embodiment of the present invention.

TextDataBits 1201 represents a two-dimensional array variable of the form PayloadSizels * 7. The FixedPayloadCRC 1202 is a CRC code value of the payload, which is fixedly received at 4 bits. The TextDataRepetition 1203 indicates the number of times the text information is repeatedly inserted into the payload. TextData 1204 is an array variable for finally outputting the text information in a bit stream structure.

13 is a diagram showing Syntax of TablePayloadData as an embodiment of the present invention.

TableIndexBits (1301) is a two-dimensional array variable in the form of PayloadSizels * 7, and loads text data by PayloadSizels in 7-bit units. TabletIndexData 1302 indicates an array variable that is finally restored in a bit stream structure and stored for outputting the text information.

14 is a diagram showing a syntax of a Timecode PayloadData as an embodiment of the present invention.

TimeCodeDataBits 1401 is a two-dimensional array variable of the form PayloadSizels / 2 * 18, and loads the time code data by PayloadSizels in units of 18 bits.

TimeCodeBuffer (1402) is a two-dimensional array that stores PayloadSizels / 2 of 18-bit time codes. TimeCodeRepetition 1403 is the number of repetition times of the time code and is equal to PayloadSizels / 2. The TimeCodeData 1404 is a stored array variable for outputting the time code information finally restored into a bit stream structure.

H_info 1405 is a variable for extracting and storing time information from TimeCodeData. M_info 1406 is a variable for extracting and storing minute information from TimeCodeData. S_info 1407 is a variable for extracting and storing seconds information from TimeCodeData.

Meanwhile, the method according to the present invention may be embodied as a program that can be executed by a computer, and may be embodied as various recording media such as a magnetic storage medium, an optical reading medium, and a digital storage medium.

Implementations of the various techniques described herein may be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or combinations thereof. Implementations may be implemented in a computer program product, such as an information carrier, e.g., a machine readable storage device, such as a computer readable storage medium, for example, for processing by a data processing apparatus, Apparatus (computer readable medium) or as a computer program tangibly embodied in a propagation signal. A computer program, such as the computer program (s) described above, may be written in any type of programming language including compiled or interpreted languages and may be stored as a stand-alone program or in a module, component, subroutine, As any other suitable unit for use in the present invention. A computer program may be deployed to be processed on one computer or multiple computers at one site or distributed across multiple sites and interconnected by a communications network.

Processors suitable for processing a computer program include, by way of example, both general purpose and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read-only memory or a random access memory or both. The elements of a computer may include at least one processor for executing instructions and one or more memory devices for storing instructions and data. Generally, a computer may include one or more mass storage devices for storing data, such as magnetic, magneto-optical disks, or optical disks, or may receive data from them, transmit data to them, . ≪ / RTI > Information carriers suitable for embodying computer program instructions and data include, for example, semiconductor memory devices, for example, magnetic media such as hard disks, floppy disks and magnetic tape, compact disk read only memory A magneto-optical medium such as a floppy disk, an optical disk such as a DVD (Digital Video Disk), a ROM (Read Only Memory), a RAM , Random Access Memory), a flash memory, an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and the like. The processor and memory may be supplemented or included by special purpose logic circuitry.

In addition, the computer-readable medium can be any available media that can be accessed by a computer, and can include both computer storage media and transmission media.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various device components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and devices will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

101: ADT encoder
102: ADT decoder
103: Additional information
104: first audio signal

Claims (16)

A method of generating a bitstream performed by an ADT encoder,
Receiving a first audio signal;
Converting the additional information into a bitstream and receiving the bitstream; And
And transmitting a second audio signal in which the bitstream is inserted to the first audio signal, to an ADT decoder.
The method according to claim 1,
The bitstream may include:
Wherein the inserted additional information is text information, and generates a text-type bitstream for transmitting text information.
The method according to claim 1,
The bitstream may include:
And generating a table index type bitstream in which the inserted additional information is transmitted as table index information, the table index information being transmitted.
The method according to claim 1,
The bitstream may include:
And generating a time information type bit stream for transmitting time information as the time information of the inserted additional information.
In the bit stream reproducing method performed by the ADT decoder,
Receiving a second audio signal from the ADT encoder, the second audio signal including additional information converted into a bit stream in the first audio signal;
Extracting a bit stream from the second audio signal; And
Converting the extracted bit stream to reproduce additional information
And reproducing the bit stream.
6. The method of claim 5,
The bitstream may include:
Wherein the inserted additional information is text information, and the text-type bitstream for transmitting the text information is reproduced.
6. The method of claim 5,
The bitstream may include:
And a table index type bit stream for transmitting the table index information as the inserted index information.
6. The method of claim 5,
The bitstream may include:
And a time information type bit stream for transmitting the time information as the time information of the inserted additional information.
An apparatus for generating a bitstream,
Wherein the bitstream generating device comprises a processor,
The processor comprising:
Receiving a first audio signal,
Converts the additional information into a bit stream and receives it,
And a second audio signal in which the bitstream is inserted into the first audio signal is transmitted to the ADT decoder.
10. The method of claim 9,
The bitstream may include:
Wherein the inserted additional information is text information, and generates a text type bit stream for transmitting text information.
10. The method of claim 9,
The bitstream may include:
And generates a table index type bitstream in which the inserted additional information is table index information and transmits table index information.
10. The method of claim 9,
The bitstream may include:
And generates the time information type bit stream for transmitting the time information as the time information of the inserted additional information.
In the bit stream reproducing apparatus,
Wherein the bit stream reproducing apparatus includes a processor,
The processor comprising:
A second audio signal in which additional information converted into a bit stream is embedded in the first audio signal is received from the ADT encoder,
Extracting a bit stream from the second audio signal,
And extracting the bitstream from the bitstream and converting the extracted bitstream to reproduce the additional information.
14. The method of claim 13,
The bitstream may include:
Wherein the inserted additional information is text information, and the text type bit stream for transmitting the text information is reproduced.
14. The method of claim 13,
The bitstream may include:
And a table index type bit stream for transmitting the table index information as the inserted index information as table index information.
14. The method of claim 13,
The bitstream may include:
And the inserted additional information is time information of the content, the time information type bit stream transmitting the time information.

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