KR20110025348A - Broadcast receiver and audio data processing method thereof - Google Patents

Abstract

PURPOSE: A monitoring broadcasting receiving device and an audio data processing method are provided to remove the convenience of a viewing when a voice is not outputted. CONSTITUTION: An audio data processing method is comprised as follows. A step of receiving a broadcasting signal and searching an audio stream PID(Packet Identification) and language code information corresponding to a language kind which is preset in the received broadcasting signal. A step of storing an audio data having the audio stream PID by setting the searched audio stream PID in a PID filter by filtering the audio data in a buffer unit. A step of determining whether an audio data is accumulated in the buffer unit(S5070).

Description

Broadcast receiver and audio data processing method

The present invention relates to a broadcast receiver and a method for processing audio data thereof, and more particularly, to output a voice of a broadcast receiver normally when an audio stream PID exists in a received digital broadcast signal but no corresponding audio stream exists. A broadcast receiver and its audio data processing method.

Generally, digital broadcasting includes digital satellite broadcasting, digital cable broadcasting, and digital terrestrial broadcasting, and a broadcast receiver such as a set-top box that receives the digital broadcasting signal of MPEG TS (Transport Stream) receives video and audio signals. After reconstruction and signal processing, the video and audio signals are transmitted to and output from a general television, so that a user can watch a desired broadcast program.

The TS received from the broadcasting station is composed of a plurality of TS packets, and each TS packet is composed of a header part and a payload part. The header portion includes a packet identifier (PID).

Also, program information is transmitted in the TS so that a program can be decoded. This is called program configuration information (PSI). The PSI includes a table such as a program association table (PAT), a program map table (PMT), a network information table (NIT), and a conditional access table (CAT).

The PID for the audio stream is received by being included in the PMT of the PSI or the Virtual Channel Table (VCT) of the Program and System Information Protocol (PSIP). For example, when audio data to be output in a specific broadcast is composed of a plurality of languages, the broadcast receiver receives, decodes and outputs the audio stream for the corresponding language through the audio stream PID for the corresponding language code information.

In the prior art, for example, if the language setting of the broadcast receiver is English, and there is no audio stream in which the language code information is English in the broadcast stream received through the actual broadcast information (PSI / PSIP), the other audio data is automatically selected. It was. However, when the broadcast information for the audio stream PID having English as the language code information is received, it is determined that the corresponding audio data exists because the PID value and the language code information exist in the broadcast information even if the audio stream does not exist.

For example, although language code information corresponding to English and Korean and audio stream PID are received, an audio stream corresponding to English may not exist due to a transmission error of a broadcasting station. In this case, since the language code information and the audio stream PID are received against the English, the user can select the English language through the broadcast information (PSI / PSIP). If English is selected, audio data corresponding to the audio stream PID does not exist. Therefore, the audio is not output from the broadcast receiver. However, the user cannot know whether an error has occurred at the transmitting end or the receiving end. There is a problem that even the audio data corresponding to the output is not output.

The present invention solves the problems of the prior art as described above, if there is an audio stream PID but the audio stream corresponding to the audio stream PID does not exist in the received broadcast stream, the broadcast receiver and audio data processing method for detecting this To provide that purpose.

In addition, the present invention not only detects an audio stream PID but there is no corresponding audio data, and automatically detects and checks another audio stream PID to output a language in which the audio data exists. It is an object of the present invention to provide an audio data processing method and apparatus.

In the audio data processing method of a broadcast receiver according to an embodiment of the present invention, a broadcast signal is received, and language code information and audio stream PID (Packet Identification) corresponding to a preset language type are received from the received broadcast signal. step; Setting the retrieved audio stream PID in a PID filter to filter and store audio data having the audio stream PID in a buffer; Determining whether the audio data is accumulated in the buffer; And retrieving language code information and an audio stream PID corresponding to a language type different from the preset language type and resetting the buffer to the buffer when the audio data is not accumulated in the buffer.

The broadcast receiver according to another embodiment of the present invention, a broadcast information extraction unit for searching for language code information and audio stream PID (Packet Identification) corresponding to a preset language type from the received broadcast signal, the searched audio stream PID Setting a PID filter for filtering audio data having the audio stream PID, a buffer for storing the filtered audio data, and determining whether audio data is accumulated in the buffer, and if audio data is not accumulated in the buffer. And a controller configured to control the broadcast information extractor to retrieve language code information and an audio stream PID corresponding to a language type different from a preset language type and to reset the PID information to the PID filter.

According to the present invention, there is an effect of eliminating the inconvenience of viewing caused when no audio is output because no real audio data exists for the language selected by the user.

In addition, according to the present invention, it is possible to determine whether an error of transmission / reception data occurs as a cause of the non-output of the voice, thereby preventing inconvenience and economic loss caused by a mistake in equipment error.

In addition, according to the present invention there is an effect that can improve the system efficiency and bandwidth usage efficiency by solving the problem that the silent output is not produced without the audio present in the TS due to the transmission error.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention that can specifically realize the above object will be described. The configuration and operation of the present invention shown in the drawings and described by the drawings are described as at least one embodiment, and the technical spirit, configuration, and operation of the present invention are not limited by such embodiments.

The terms used in the present invention have been selected as widely used general terms as possible in consideration of the configuration and function of the present invention, but may vary according to the intention and custom of the person skilled in the art or the emergence of new technologies. In certain cases, there is also a term arbitrarily selected in this specification, in which case the meaning will be described in detail in the description of the invention. Therefore, it is to be understood that the terminology used in the present invention should be defined and understood based on the meaning of the term and the contents throughout the present specification, rather than simply the name of the term.

Korea, the United States, and Canada have adopted the Advanced Television Systems Committee (ATSC) as a digital broadcast standard. In addition to the specifications for audio and video encoding and decoding, ATSC defines a specification called Program and System Information Protocol (PSIP) to find the desired channel and to find the audio and video transmitted in the channel. PSIP is a standard that transmits additional information containing information necessary for watching digital TV established by ATSC.

PSIP defines EPG (Eletronic Program Guide) and System Information (SI) as one, and is ATSC's standard for terrestrial and cable digital broadcasting. The PSIP standard is defined to provide a variety of information about a program by parsing messages encoded by the method of Moving Picture Experts Group (MPEG-2) ISO / IEC 13818-1.

PSIP consists of several tables to transmit and receive A / V data in MPEG-2 video and AC-2 audio format, and to transmit information about channels of each broadcasting station and information about each program of channels. In addition, the PSIP may support a navigation function for A / V service of a broadcast by selecting a channel and an additional function for EPG, that is, broadcast guide service, for a broadcast program.

FIG. 1 is a diagram illustrating bitstream syntax of a terrestrial VCT (TVCT) in a PSIP.

The VCT includes fields indicating a transport stream (TS) ID, a channel number (major, minor), a short channel name, a carrier frequency, a program number, and the like, and additional information is contained in a VCT descriptor. In FIG. 1, a descriptor 1010 is a descriptor for language code information, and the bitstream syntax of the descriptor is shown in FIG. 2.

2 is a diagram illustrating bitstream syntax of a descriptor for an audio stream of a VCT.

In the descriptor of FIG. 2, the stream_type field 2010 indicates the type of audio to be transmitted, the elementary_PID field 2020 indicates the PID of the transmitted audio stream, and the ISO_639_language_code field 2030 indicates language code information used in the transmitted stream. .

The language code information and the audio stream PID may be transmitted through a program map table (PMT) of program specific information (PSI) as well as the PSIP.

3 is a diagram illustrating bitstream syntax of a PMT in a PSI.

The PMT includes fields indicating a table ID, a section length, a program number, and the like, and additional information about the PMT is included in the PMT descriptor. In FIG. 3, the elementary_PID field 3010 indicates a PID for an audio stream, and a descriptor 3020 is a descriptor for language code information, and a bitstream syntax of the descriptor is illustrated in FIG. 4.

4 is a diagram illustrating bitstream syntax of a descriptor for an audio stream of a PMT.

The descriptor (ISO_639_language_descriptor) of FIG. 4 relates to language code information and identifies a language type used in a corresponding program. For audio streams consisting of multiple languages, this descriptor reflects the content of the audio stream.

As described above, the video and audio stream PID of the broadcast program are included in the broadcast information (PSI / PSIP) and received. The receiver parses broadcast information (PSI / PSIP) to extract language information included in the broadcast stream, and decodes and reproduces an audio stream including the corresponding language. That is, the broadcast receiver determines whether an audio stream composed of a predetermined language exists based on an audio stream PID included in broadcast information (PSI / PSIP), filters, stores, and decodes an audio stream corresponding to the audio stream PID. Will play.

At this time, the audio stream PID corresponding to the selected language type exists, but if the corresponding audio stream does not exist, the broadcast receiver and the user cannot know this. In this case, a method for checking and processing the existence of the audio stream is required. This is explained below.

5 is a flowchart illustrating an audio data processing method according to an embodiment of the present invention.

The user may select a language type of the broadcast receiver (5010). The user may select a basic language type through language setting of the broadcast receiver, and may select a language type for each broadcast program according to channel switching.

While the broadcast receiver receives broadcast data, the broadcast receiver receives broadcast information such as PSIP / PSI included in the broadcast data (5020). Reception of broadcast information is performed as follows.

As an example, the broadcast receiver sets a PID for the PSIP / PSI data and filters the PSIP / PSI data having the PID. When the PSIP / PSI data is filtered in this way, the section data is received from the section buffer through the PSIP / PSI data section filter to construct and parse broadcast information.

The broadcast receiver checks whether the audio stream having language code information corresponding to the currently set language type exists from the configured broadcast information (5030). If the language code information and audio stream PID corresponding to the set language type exist, the broadcast receiver determines that the corresponding audio stream exists. If the language code information or audio stream PID does not exist, the corresponding audio stream does not exist. It is determined that (5040).

When the broadcast receiver determines that an audio stream corresponding to the set language type exists, the audio stream PID having the language code information corresponding to the set language type is checked, and the audio data having the audio stream PID is filtered to buffer the audio stream. In operation 5050. If the broadcast receiver determines that the audio stream corresponding to the set language type does not exist, the language code information and the audio stream PID are searched and automatically switched to the existing language type according to the setting, or the language existing according to the user's selection. The audio stream PID setting is changed to the type, and the audio stream is filtered and stored in the buffer (5060).

When the audio stream is filtered and stored in the buffer, the broadcast receiver decodes and outputs the audio stream stored in the buffer (5070). At this point, the broadcast receiver checks whether audio data is accumulated in the buffer (5080).

When the audio data is accumulated in the buffer, the broadcast receiver determines that the set language code information and the audio data corresponding to the audio stream PID exist and are normally decoded and output, and continue decoding and outputting the audio stream. do.

When the audio data is not accumulated in the buffer, the broadcast receiver determines that audio output is not performed because there is no audio stream corresponding to the set language code information and the audio stream PID. In this case, the broadcast receiver searches for an audio stream PID corresponding to another language type present in the data received from the parsed broadcast information, changes the setting (S5050), filters and stores another audio stream, and decodes the stored audio data. Output The broadcast receiver may inform the user that there is no data corresponding to the currently selected language type according to the setting, and may display a selectable language type as a menu.

6 is a block diagram illustrating an audio data processing apparatus of a broadcast receiver according to an embodiment of the present invention.

The audio data processing apparatus of FIG. 6 includes a PID filter 6010, a buffer 6020, an audio decoder 6030, a broadcast information extractor 6040, and a controller 6050.

PID filter 6010 filters the packets with PIDs for audio and PSI / PSIP from the received TS. The filtered packet is stored in the buffer 6020. 6 conceptually illustrates only portions necessary for implementing the audio data processing method according to an embodiment of the present invention.

The broadcast information extractor 6040 extracts the broadcast information filtered by the PID filter and parses the PSI / PSIP. For example, the broadcast information extractor 6040 may construct a section by parsing a section filter for filtering a section filtered by a PID filter, a buffer for storing data filtered in a PID / section filter, and PSI / PSIP data. It may include an SDRAM.

When a language type of audio output from the broadcast receiver is selected, the broadcast information extractor 6040 extracts and parses broadcast information from the received TS. The controller determines whether audio data having language code information corresponding to the set language type exists from the parsed PSI / PSIP, and if the corresponding audio data exists, sets the PID of the PID filter 6010 to determine the corresponding audio data. To filter. The filtered audio data is stored in the buffer 6020, decoded by the audio decoder 6030 and output to the audio output.

The controller 6050 checks whether the corresponding audio data is stored in the buffer. When the audio data according to the PID set in the buffer is not stored, the controller searches for an audio stream PID having another language code information in which the audio data exists, and changes the audio stream PID set in the PID filter. According to the setting, if the audio data is not stored in the buffer, the controller may inform the user that there is no audio data of the corresponding language type, and display the changeable language type as a selectable menu.

The presence or absence of the audio data accumulated in the buffer may be performed by checking the capacity of the buffer or by increasing the capacity, or by checking the amount of data input to the buffer and output.

The controller of the broadcast receiver may set the audio stream PID to check the buffer capacity before storing the filtered audio stream in the buffer and the buffer capacity after the start of audio output. In this case, when there is no change in the capacity of the buffer or the increase of the capacity is not large, it may be determined that there is no audio stream corresponding to the set audio stream PID. Alternatively, the amount of data input to the buffer or the amount of data output from the buffer is checked at regular time intervals or continuously. If the amount of data is less than a predetermined reference, no audio stream corresponding to the set audio stream PID exists. It can be judged that.

According to the present invention, there is an effect of eliminating the inconvenience of viewing caused when no audio is output because no actual audio exists for the language selected by the broadcast receiver.

In addition, according to the present invention, it is possible to determine whether an error of transmission / reception data occurs as a cause of the non-output of the voice, thereby preventing inconvenience and economic loss caused by a mistake in equipment error.

In addition, according to the present invention there is an effect that can improve the system and bandwidth usage efficiency by solving the problem that the audio output in the TS does not play due to the transmission error, the silent output occurs.

1 is a view showing the bitstream syntax of terrestrial VCT (TVCT) in PSIP,

2 is a diagram showing a bitstream syntax of a descriptor for an audio stream of a VCT;

3 is a diagram illustrating a bitstream syntax of a PMT in a PSI;

4 shows bitstream syntax of a descriptor for an audio stream of a PMT;

5 is a flowchart illustrating an audio data processing method according to an embodiment of the present invention.

6 is a block diagram illustrating an audio data processing apparatus of a broadcast receiver according to an embodiment of the present invention.

Claims (16)

Receiving a broadcast signal and retrieving language code information and audio stream PID (Packet Identification) corresponding to a preset language type from the received broadcast signal; Setting the retrieved audio stream PID in a PID filter to filter and store audio data having the audio stream PID in a buffer; Determining whether the audio data is accumulated in the buffer; And If the audio data is not stored in the buffer, retrieving the language code information and the audio stream PID corresponding to a language type different from the preset language type, and resetting the buffer to the buffer. How to process audio data. The method of claim 1, The audio data processing method of the broadcast receiver, And decoding and outputting the audio data stored in the buffer. The method of claim 1, The audio data processing method of the broadcast receiver, And continuously decoding and outputting the audio data accumulated in the buffer when the audio data accumulated in the buffer exists. The method of claim 1, Determining whether there is audio data accumulated in the buffer, And determining whether to accumulate the audio data by checking at least one of an amount of audio data accumulated in the buffer or a change in the capacity of the buffer. The method of claim 1, Determining whether there is audio data accumulated in the buffer, And determining whether to accumulate the audio data by checking at least one of the amount of data input to the buffer and the amount of data output from the buffer. The method of claim 1, If there is no audio data accumulated in the buffer, retrieving and resetting the audio stream PID including the audio data may include: Searching for language code information and an audio stream PID corresponding to a language type different from the preset language type; Displaying a first user interface for selecting at least one of the searched language types from a user; And And resetting the audio stream PID corresponding to the language type selected from the first user interface to the PID filter. The method of claim 6, If there is no audio data accumulated in the buffer, retrieving and resetting the audio stream PID including the audio data may include: And displaying a second user interface indicating that there is no audio data of the preset language type. The method of claim 1, The search of the language code information and the audio stream PID may be performed by extracting and searching a program specific information (PSI) or a program and system information protocol (PSIP) of the received broadcast signal. . A broadcast information extraction unit for searching for language code information and audio stream PID (Packet Identification) corresponding to a preset language type from the received broadcast signal; A PID filter for setting the retrieved audio stream PID to filter audio data having the audio stream PID, A buffer for storing the filtered audio data, and It is determined whether audio data is accumulated in the buffer, and if audio data is not accumulated in the buffer, the broadcast information extracting unit is controlled to search for language code information and audio stream PID corresponding to a language type different from a preset language type. And a control unit for controlling to reset the PID filter. The method of claim 9, The broadcast receiver, And an audio decoder for decoding and outputting audio data stored in the buffer. The method of claim 9, And the controller controls to continuously decode and output the audio data when there is audio data accumulated in the buffer. The method of claim 9, The determination of whether or not there is audio data accumulated in the buffer of the controller is performed by checking at least one of the amount of the audio data accumulated in the buffer or the change of the capacity of the buffer. The method of claim 9, The determination of whether there is audio data accumulated in the buffer of the controller is performed by checking at least one of the amount of data input to the buffer and the amount of data output from the buffer. . The method of claim 9, If there is no audio data stored in the buffer, the controller searches language code information and an audio stream PID corresponding to a language type different from the preset language type, and retrieves at least one of the found language types from a user. And displaying the selected first user interface to reset the audio stream PID corresponding to the language type selected from the first user interface to the PID filter. The method of claim 14, The control unit, if there is no audio data accumulated in the buffer, the broadcast receiver, characterized in that for displaying that the audio data of the preset language type does not exist. The method of claim 9, The searching of the language code information and the audio stream PID may be performed by extracting and searching for program specific information (PSI) or program and system information protocol (PSIP) of the received broadcast signal.

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