JP4481897B2 - VANC processing apparatus for digital broadcast signal and signal processing method thereof - Google Patents

Description

  The present invention relates to a digital broadcast signal VANC processing apparatus and an error check signal processing method thereof.

  Recently, satellite digital broadcasting and terrestrial digital broadcasting have been introduced, and broadcast signals of these programs include not only video and audio signals, but also auxiliary data (ancillary data) for processing various additional functions such as caption information. An apparatus that uses a superimposed digital signal (for example, Non-Patent Document 1) and performs processing using a blank time in such a vertical synchronization period is called a VANC processing apparatus.

  A digital broadcast program signal transmitted / received to / from other devices and devices by the VANC processing device is transmitted between the devices via an optical fiber or a coaxial cable. The data frame configuration includes information fields such as video or audio. Ancillary data and CRC (Cyclic Redundancy Check Code) are included to correct errors during transmission.

If an error occurs on the transmission path, etc., error correction is performed after CRC check on the input side of the digital broadcast program signal, but if the broadcast program signal is transmitted in real time, error processing including video information is performed. There was a problem of delay time.
BTA S-005B 1125/60 system HDTV signal bit serial interface standard

  In the digital broadcast program signal processing process, after CRC check on the digital broadcast program signal input side, error correction etc. that occurred in the transmission path etc. are performed, but when broadcasting program signal is transmitted in real time, video information etc. When error processing is performed on high-speed data, there is a problem that a delay time occurs that hinders screen display.

  The present invention has been made to solve the above problem, and even if an error occurs during transmission of a digital broadcast program signal to which ancillary data (auxiliary data, hereinafter referred to as VANC data) is added, It is an object of the present invention to provide a VANC processing apparatus and a signal processing method therefor, which prevent occurrence of malfunction and delay time in video information transmission and execute an additional function set by VANC data when normal.

In order to achieve the above object, the VANC processing apparatus of the present invention is a VANC processing apparatus that performs signal processing set in auxiliary data of a digital broadcast program signal transmitted between studio apparatuses. One input terminal connected to the input terminal of the VANC processing unit, the other output terminal connected to one input terminal of the output switch, and one input terminal connected to the input switch. An output switch connected to the other output terminal, the other input terminal connected to the output terminal of the VANC processing unit, and the signal processing set in the auxiliary data of the digital broadcast program signal to perform the second digital broadcast program A VANC processing unit that generates and outputs a signal, and a CR of the digital broadcast program signal input to the input terminal of the input switch An error check unit that determines whether the input signal is good or bad by an error check code and outputs the error check unit, and if the good or bad decision input from the error check unit is good, the output destination of the input switch is set to the VANC processing unit. In addition, when the input destination of the output switch is controlled to be the output terminal of the VANC processing unit, and the pass / fail judgment input from the error check unit is NO , the error correction processing to the digital broadcast program signal and the The output destination of the input switch is connected to the one input terminal of the output switch, and the input destination of the output switch is connected to the other output terminal of the input switch so as to omit the signal processing set in auxiliary data. And a control unit that performs connection control.

The signal processing method of the VANC processing apparatus according to the present invention is the signal processing method of the VANC processing apparatus that performs signal processing set in auxiliary data of a digital broadcast program signal transmitted between studio apparatuses. Includes an input switch, an output switch, a VANC processing unit, an error check unit, and a control unit, and a digital broadcast program signal is input to an input terminal of the input switch, and one output terminal is the VANC processing unit. is connected to the input terminal, connected to the other one of the input terminals of the output terminal is the output switch, wherein the error check unit, CRC errors checking of the digital broadcast program signal that is input to said input terminal of said input switch to determine the quality of a signal the input by the code output to the control unit, the Erache If the quality determination input from the click portion is good, one of the output destination of the input switch and the VANC processing unit, performing the VANC processing unit signal processing which is set in the auxiliary data of the digital broadcast program signal When the second digital video signal output in this way is output via one input of the output switch and the pass / fail judgment input from the error check unit is negative, an error is detected in the digital broadcast program signal. correction processing and the auxiliary data which is set to said signal processing and like omitted, while the other output destination of the input switch to the other input terminal of the output switch, the input switch input destination of the output switch The other output terminal is controlled.

  According to the present invention, even if an error occurs during transmission of a digital broadcast program signal to which ancillary data is added, it is possible to prevent malfunction of VANC processing and occurrence of delay time in video information transmission. It is possible to provide a VANC processing apparatus and a signal processing method for executing a set additional function.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating a functional configuration of a digital broadcast program signal processing system (hereinafter referred to as a VANC data processing apparatus) according to an embodiment of the present invention, and FIG. 2 is a data frame structure of the digital broadcast program signal. FIG.
The configuration of the VANC data processing apparatus and the operation procedure thereof will be described below with reference to FIGS. In FIG. 1, the VANC data processing apparatus includes an input switch 1, an error check unit 2, a control unit 3, a VANC processing unit 4, and an output switch 5.

  In FIG. 2, a digital broadcast program signal includes a data field DF, data head information HD, trailing information TD, ancillary data (auxiliary information, hereinafter referred to as VANC data) VD, spare data AD such as a line number, It consists of error check data CRC. Although the error check may be performed for the VANC data, the head information HD, the data field DF, the tail information TD, the VANC data VD, and the spare data AD are checked here.

  The VANC data processing device reads the contents related to the broadcast processing set in the VANC data VD, performs, for example, processing such as superimposition of character data, and outputs it (hereinafter referred to as VANC processing). The VANC data processing apparatus according to the embodiment of the present invention, when an error is found in the input digital broadcast program signal, bypasses the input signal without performing the VANC process and outputs the error, thereby causing a malfunction of the VANC process. Do the operation to avoid.

FIG. 3 is a flowchart for explaining the operation procedure of the VANC data processing apparatus.
In FIG. 1, the output destination of the input switch 1 of the VANC data processing device is the VANC processing unit 4 (step s1). The digital broadcast program signal input to the VANC data processing device is subjected to a CRC check by the error check unit 2 connected to the input terminal of the input switch 1 (step s2). It is output to the control unit 3. When the control unit 3 receives “good” from the error check unit 2 (Yes in step s3), the connection destination of the input switch 1 is maintained in the VANC processing unit 4 (step s4). The VANC processing unit 4 reads the contents related to the broadcast processing set in the VANC data VD of the digital broadcast program signal, performs, for example, character data superimposition processing (VANC processing), and one input terminal of the output switch 2 (Step s5). If the control unit 3 receives “good” at the same time, the control unit 3 sets the output switch 2 to output the signal input to one input terminal of the output switch 2 to the outside (step s6).

  If no error occurs due to the above control, the digital broadcast program signal processed by the VANC processing unit 4 is output to another studio apparatus or the like as the digital broadcast program signal, and further, the required processing is performed at the output destination. .

  On the other hand, when the control unit 3 receives “No” from the error check unit 2 (No in step s3), the control unit 3 connects the output destination of the input switch 1 to the other input of the output switch 5 (step s7) and outputs it. The input source of the switch 5 is switched to the other input terminal to which the output destination of the input switch 1 is connected (step s8). The digital broadcast program signal input to the VANC processing device is not processed by the VANC processing unit 4, but is bypassed and output to another studio device or the like.

  If the output signal is not a continuous failure, but an error occurs due to instantaneous noise, for example, the character subtitles are not displayed instantaneously or the screen is momentarily disturbed. However, the predetermined VANC process is continued as long as it does not cause discomfort. Accordingly, there is no inconvenience that a delay time due to error correction occurs and the screen becomes discontinuous, and malfunction of the VANC processing due to a transmission error can be prevented.

  As described above, in the VANC data processing apparatus according to the embodiment of the present invention, even if an error occurs during transmission of a digital broadcast program signal, the delay time is prevented from occurring and the additional function set by the ancillary data is executed. can do.

The block diagram which shows the function structure of the VANC data processing apparatus concerning the Example of this invention. The figure explaining the concept of the structure of the data frame of the digital broadcast program signal containing VANC data. The flowchart explaining the operation | movement procedure of the VANC data processing apparatus concerning the Example of this invention.

Explanation of symbols

1 Input switch 2 Error check unit 3 Control unit 4 VANC processing unit 5 Output switch DF Data field HD First information TD Trailing information VD Ancillary data (VANC data)
AD spare data CRC error check data

Claims (2)

In a VANC processing device that performs signal processing set in auxiliary data of a digital broadcast program signal transmitted between studio devices ,
An input switch in which the digital broadcast program signal is connected to an input terminal, one output terminal is connected to an input terminal of the VANC processing unit, and the other output terminal is connected to one input terminal of an output switch;
An output switch having one input terminal connected to the other output terminal of the input switch and the other input terminal connected to the output terminal of the VANC processing unit;
A VANC processing unit that performs signal processing set in auxiliary data of the digital broadcast program signal to generate and output a second digital broadcast program signal;
An error check unit that determines whether the input signal is good or bad by a CRC error check code of the digital broadcast program signal input to the input terminal of the input switch; and
When the pass / fail judgment input from the error check unit is good, control is performed so that the output destination of the input switch is the VANC processing unit and the input destination of the output switch is the output terminal of the VANC processing unit,
If the pass / fail judgment input from the error check unit is NO, the output destination of the input switch is set so as to omit the error correction processing for the digital broadcast program signal and the signal processing set in the auxiliary data. A VANC processing device, comprising: a control unit that performs control to connect the one input terminal of the output switch and the input destination of the output switch to the other output terminal of the input switch. In a signal processing method of a VANC processing device that performs signal processing set in auxiliary data of a digital broadcast program signal transmitted between studio devices ,
The VANC processing device includes an input switch, an output switch, a VANC processing unit, an error check unit, and a control unit,
The digital broadcast program signal is input to the input terminal of the input switch, connected one output terminal to the input terminal of the VANC processing unit, which is the other output terminal is connected to one input terminal of the output switch,
The error check unit determines whether the input signal is good or bad by a CRC error check code of the digital broadcast program signal input to the input terminal of the input switch, and outputs the signal to the control unit.
Wherein, when the it is good that quality determination to be inputted from the error check unit, one of the output destination of the input switch and the VANC processing unit, the auxiliary data of the VANC processing unit the digital broadcast program signal Performing control to output the second digital video signal output by performing the set signal processing via one input of the output switch;
If quality determination input from the error checker is negative, like omitted and the signal processing set in the auxiliary data and the error correction processing to the digital broadcast program signal, the other output of the input switch A signal processing method for a VANC processing device, characterized in that control is performed so that the destination is the other input terminal of the output switch and the input destination of the output switch is the other output terminal of the input switch.

Images