JP2004312428A - Controller and control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To resolve the problem that a conventional controller like a frame synchronizer cannot be applied to field data to which a discrimination signal or the like for discriminating contents of inputted field data is not added, because it is necessary for the controller to add the discrimination signal to the field data in order to prevent dropouts of the information of an arbitrary field. <P>SOLUTION: The frame synchronizer is provided with; a field data prediction part 8 for predicting contents of field data to be next inputted, from the contents of the field data inputted to the frame synchronizer; and a field data multiplexing part 14 for multiplexing the field data control information predicted by the field data prediction part 8, with a video signal read out from a field memory 19. Thus, the dropout of field information using a result predicted by the field data prediction part 9 is prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control device and a method used for mixing information such as two or more video signals or switching information such as video signals, and for example, for mixing two video signals. The present invention relates to a circuit for converting the synchronization of one video signal into the synchronization of another video signal.
[0002]
[Prior art]
The conventional frame synchronizer circuit determines the contents of input field data and controls writing and reading of the field data to and from a plurality of storage means according to the determination result, thereby providing a write cycle and a read cycle. Overwriting of data due to the difference between the two fields can be prevented, and synchronous conversion of a video signal can be performed without losing information in an arbitrary field.
[0003]
[Patent Document 1]
JP-A-8-46820
[Problems to be solved by the invention]
In the conventional frame synchronizer, it is necessary to add an identification signal or the like for determining the contents of the input field data to the field data in order to prevent any information of the field from being lost. There is a problem that it cannot be applied to field data that has not been used.
[0005]
The present invention has been made in order to solve the above-described problem, and it is an object of the present invention to perform synchronous conversion of a video signal without using any special identification signal or the like and without losing information of an arbitrary field. It is the purpose.
[0006]
[Means for Solving the Problems]
To achieve the above object, a control device according to the present invention includes a memory for storing information,
Information including control information is input, and a write control unit that controls writing of the input information to the memory;
A read control unit that controls reading of information written to the memory by the write control unit;
A prediction unit for predicting control information included in information to be input next from control information included in the input information;
A multiplexing unit that replaces control information included in the information read by the read control unit with control information predicted by the prediction unit.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, Embodiment 1 will be described.
FIG. 1 is a configuration diagram of a frame synchronizer according to Embodiment 1 of the present invention. Here, the frame synchronizer corresponds to an example of the control device of the present invention, and the control device of the present invention constitutes all or a part of the frame synchronizer.
In FIG. 1, input video / field data 1 input to a frame synchronizer is written in each field memory (field memory A3, field memory A3) of a field memory 19 by a write control unit 2 which controls writing of video / field data to the frame synchronizer. The data is written to the memory B4, the field memory C5, and the field memory D6). That is, the field memory 19 includes a plurality of field memories (field memory A3, field memory B4, field memory C5, and field memory D6) constituting the frame synchronizer.
In the input video / field data 1, the video information corresponds to an example of input information, and the input information may be audio information, text information, or the like in addition to the video information. Further, the field data corresponds to control information included in the input information.
The read control unit 7 controls reading of video / field data from a plurality of field memories (field memories A3 to D6) constituting the frame synchronizer.
The field data prediction unit 8 separates the field data from the input video / field data 1, predicts the next field data to be input from the separated field data, and outputs the predicted field data 9.
The field data separation unit 11 separates field data from the video / field data 10 read from the field memories 19 (field memories A3 to D6) by the read control unit 7, and the field data comparison unit 13 The field data 12 separated by the separation unit 11 is compared with the predicted field data 9 predicted by the field data prediction unit 8.
The field data multiplexing unit 14 multiplexes the predicted field data 9 on the video data read from the field memory 19 based on the result of the field data comparing unit 13 and separated from the field data by the field data separating unit 11. , Output video / field data 15 of the frame synchronizer.
Here, the above-described field data prediction unit 8 corresponds to a prediction unit, the field data separation unit 11 corresponds to a separation unit, the field data comparison unit 13 corresponds to a comparison unit, and the field data multiplexing unit 14 corresponds to a multiplexing unit. Equivalent to.
[0008]
Next, the operation will be described.
The field data prediction unit 8 predicts the next field data to be input from the input video / field data 1 and transmits the predicted field data 9 to the field data comparison unit 13. On the other hand, in the field data separation unit 11, the read control unit 7 of the frame synchronizer separates the field data 12 from the video / field data 10 read from the field memories A3 to D6 and transmits the data to the field data comparison unit 13. I do.
[0009]
The field data comparing unit 13 compares the predicted field data 9 with the separated field data 12.
If the comparison results are the same, the video / field data 10 read from the field memories A3 to D6 is output as the output video / field data 15 of the frame synchronizer.
On the other hand, if the result of comparison between the predicted field data 9 and the separated field data 12 is clearly different, the field data multiplexing unit 14 replaces the field data 12 read from the field memories A3 to D6 with the predicted field data. The field data 9 is multiplexed with the video data read from the field memories A3 to D6 and output as the output video / field data 15 of the frame synchronizer.
[0010]
Here, the operation of the field data prediction unit 8 will be described.
FIG. 2 shows, for example, the structure of the inter-broadcasting control signal described on page 6 of the standard "Structure of the inter-broadcasting control signal transmitted in the auxiliary data packet format (ARIB STD-B39)" specified by the Radio Industries and Businesses Association. It is a data structure figure.
As shown in the figure, a control signal corresponding to the above-described field data includes a start code 25, a start time 26, a video current mode 27, a video next mode 28, a video mode countdown 29, an audio current mode, an audio next mode, It comprises an audio mode countdown, a trigger signal, a trigger counter, a trigger countdown, a status signal, a reserved area, and a private area.
[0011]
Here, the origination code 25 is a code for displaying the origination name in characters, the origination time 26 is a time indicating the time information of the origination, the video current mode 27 is a mode indicating the current attribute of the video signal, and the video The next mode 28 is a mode indicating an attribute scheduled next to the video signal, and the video mode countdown 29 is a counter indicating timing information for the video mode. That is, the video mode countdown 29 is a counter for measuring the timing at which the attribute of the control information (field data) switches to the next attribute, and the video next mode 28 indicates the attribute of the control information (field data) after the switching.
Specifically, the video mode countdown 29 counts down the remaining time until the mode change timing in units of fields, and expresses a value from 0 to 254 using 8 bits. When the countdown is not performed, 255 (hexadecimal “FF”) is set.
[0012]
FIG. 3 shows an example of the use of the video mode and the countdown described on page 15 of the standard specification "Arrangement of Control Signals Between Broadcasting Stations Transmitted in Auxiliary Data Packet Format (ARIB STD-B39)" specified by the Association of Radio Industries and Businesses. .
As shown in FIG. 3, the video mode countdown 29 starts counting down three seconds before the mode change timing, and sets the countdown value to “0” in the field immediately before the mode change timing. The video current mode 27 switches from A to B in the next field after the video mode countdown 29 becomes “0”, and the video next mode 28 switches from B to C.
[0013]
FIG. 4 is a diagram illustrating a prediction method when the field data is a control signal between broadcast stations.
As shown in the figure, the inter-broadcasting control signal at time a is such that the originating code 25 is XXXX, the originating time 26 is Jan. 23, 2003, 11: 30: 00: 00 ms, the video current mode 27 is A, The video next mode 28 is B, the video mode countdown 29 is 2, and the next input inter-broadcasting control signal at time b is that the originating code 25 is XXXX and the originating time 26 is January 23, 2003 11: 30: 03: 033 ms, when the video current mode 27 is A, the video next mode 28 is B, and the video mode countdown 29 is 1, the originating code 25 remains unchanged from the data at time a and time b. It can be analogized that the start time 26 increases by 33 ms, the video current mode 27 and the video next mode 28 remain unchanged, and the video mode countdown 29 decreases by 1. The inter-broadcasting station control signal at the time c inputted next is as follows: the originating code 25 is XXXX, the originating time 26 is Thursday, January 23, 2003, 11: 30: 00: 00, and the video current mode 27 is A. It can be easily predicted that the video next mode 28 is B and the video mode countdown 29 is 0.
[0014]
In the above description, the samples at the time a and the time b are used to predict the field data at the time c. However, it goes without saying that if the number of samples is further increased, highly accurate prediction can be performed.
[0015]
In this way, the field data prediction unit 8 compares the attribute of the control information (field data) with the counter that measures the timing of switching to the next attribute and the attribute of the control information (field data) after the switching. By acquiring the control information (field data) from the control information (field data), the control information (field data) input at the time can be predicted.
[0016]
Therefore, the frame synchronizer according to the present embodiment can predict the content of the next field data to be input from the content of the field data input to the frame synchronizer, and use the predicted result to delete the field information. Can be prevented.
[0017]
Embodiment 2 FIG.
FIG. 5 is a diagram for explaining a frame synchronizer according to a second embodiment for implementing the present invention.
5, the same reference numerals as those in FIG. 1 denote the same or equivalent functions, and a description thereof will be omitted.
In FIG. 5, a field data identification section 17 is a circuit for identifying a field data type from an identifier added to the field data, and outputs a data type flag 18 for notifying the field data type identified by the field data identification section. I do. The field data identification unit 17 corresponds to an identification unit, and the field data type corresponds to the type of control information.
[0018]
FIG. 6 is a diagram illustrating an identifier added to the field data defined by “Structure of control signal between broadcast stations transmitted in auxiliary data packet format (ARIB STD-B39)”.
In FIG. 6, a data identification word 20 is a DID in an auxiliary data packet which becomes hexadecimal "5F" at the time of a control signal packet between broadcast stations, and a second data identification word 21 is "FE" in a hexadecimal number at the time of a control signal packet between broadcast stations. Is the SDID in the auxiliary data packet.
[0019]
When the field data identification unit 17 identifies the field data as an “inter-broadcasting station control signal transmitted in an auxiliary data packet format” from the data identification word 20 and the second data identification word 21, for example, the data type Since the structure of the inter-broadcasting control signal data word 22 shown in FIG. 6 is known, the field data prediction unit 8 notified of the flag 18 can easily predict the next field data to be input. It becomes.
Further, the field data multiplexing unit 14, which is notified by the data type flag 18 that the field data is the inter-broadcasting station control signal from the field data identification unit 17, is generated when it is read from the field memories A3 to D6. Since the prediction field data 9 is multiplexed regardless of the loss of the video data, it is possible to realize a frame synchronizer in which the loss of the field data does not occur.
[0020]
Embodiment 3 FIG.
FIG. 7 is a diagram for explaining a frame synchronizer according to a third embodiment for implementing the present invention.
7, the same reference numerals as those in FIG. 1 denote the same or equivalent functions, and a description thereof will be omitted.
In FIG. 7, when video data is read from the field memories A3 to D6, repetition (repeat) or skipping (skip) of video data in a field unit occurs due to a difference between a frame synchronizer writing cycle and a reading cycle. Then, the read control unit 7 sends a skip / repeat flag 16 to the field data multiplexing unit 14 for notifying a repeat / skip state (a state of repetition (repeat) or skip (skip) of video data). That is, the read control unit 7, when duplicate reading of information (repeat of video data) or loss of information to be read (skip of video data) occurs, causes either of redundant reading of information or loss of information to be read. (Skip / repeat flag 16).
In the field data multiplexing unit 14, from the state of the skip / repeat flag 16, if it is determined that skip / repeat has occurred, the field data multiplexing unit 14 replaces the field data with the predicted field data 9, and if it determines that skip / repeat has not occurred, no processing is performed. Do not do.
[0021]
As described above, if the skip / repeat signal detected by the read control of the frame synchronizer is used, it is possible to detect the lack of the field information without comparing the field data. When information is missing, it is possible to quickly supplement the field data using the predicted field data.
[0022]
As described above, in all the embodiments, each operation of each component is related to each other, and the operation of each component can be replaced as a series of operations while considering the relation of the operations described above. it can. Then, by substituting in this way, an embodiment of the method invention can be obtained.
[0023]
【The invention's effect】
According to the present invention, by providing a function of predicting field data output from a frame synchronizer output, it is possible to prevent a loss of field data even when video data jumps and repeats in the frame synchronizer.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a frame synchronizer according to a first embodiment of the present invention.
FIG. 2 is a data configuration diagram of a control signal between broadcast stations transmitted in an auxiliary data packet format.
FIG. 3 is a diagram illustrating a usage example of a video mode and a countdown described on page 15 of “Structure of Control Signal Between Broadcasting Stations Transmitted in Auxiliary Data Packet Format (ARIB STD-B39)”.
FIG. 4 is a diagram illustrating a prediction method when field data is a control signal between broadcast stations.
FIG. 5 is a diagram for explaining a frame synchronizer according to a second embodiment of the present invention;
FIG. 6 is a diagram illustrating an identifier added to field data defined by a structure (ARIB STD-B39) of a control signal between broadcast stations transmitted in an auxiliary data packet format.
FIG. 7 is a diagram for explaining a frame synchronizer according to a third embodiment for implementing the present invention;
[Explanation of symbols]
Reference Signs List 1 input video / field data, 2 write control unit, 3 field memory A, 4 field memory B, 5 field memory C, 6 field memory D, 7 read control unit, 8 field data prediction unit, 9 predicted field data, 10 video / Field data, 11 field data separation unit, 12 field data, 13 field data comparison unit, 14 field data multiplexing unit, 15 output video / field data, 16 skip / repeat flag, 17 field data identification unit, 18 data type flag, 19 field memory, 20 data identification word, 21 second data identification word, 25 start code, 26 start time, 27 video current mode, 28 video next mode, 29 video mode countdown.

Claims (7)

A memory for storing information;
Information including control information is input, and a write control unit that controls writing of the input information to the memory;
A read control unit that controls reading of information written to the memory by the write control unit;
A prediction unit for predicting control information included in information to be input next from control information included in the input information;
A control unit that replaces control information included in the information read by the read control unit with control information predicted by the prediction unit. The control device further includes:
A separation unit that separates control information from information read by the read control unit;
Comprising a control unit for comparing the control information predicted by the prediction unit and the control information separated by the separation unit,
The multiplexing unit, if the control information predicted by the prediction unit and the control information separated by the separation unit are different as a result of the comparison by the comparison unit, the control information included in the information read by the read control unit. The control device according to claim 1, wherein is replaced with control information predicted by the prediction unit. The prediction unit predicts control information included in information input at an arbitrary time from a counter that measures a time at which an attribute included in the control information switches to a different attribute and an attribute that the control information after switching will have. The control device according to claim 1. The control device further includes:
From the control information included in the input information, comprising an identification unit that identifies the type of control information that is input next,
The control device according to claim 1, wherein the prediction unit predicts control information to be input next from a type of the control information identified by the identification unit. The read control unit sends a skip / repeat flag for notifying either duplicate reading of information or missing information to be read,
2. The multiplexing unit according to claim 1, wherein the multiplexing unit replaces control information included in the information read by the read control unit with control information predicted by the prediction unit according to a skip / repeat flag sent by the read control unit. Control device. The control device according to claim 1, wherein the control device is one or all of a frame synchronizer that inputs video information as information and controls the input video information. Store the information in memory,
Input information including control information, and write the input information to the memory;
Reading the information written to the memory,
From the control information included in the input information, predict the control information included in the next input information,
A control method for replacing control information included in the read information with the predicted control information.

Images