JP2643933B2 - Identification information superimposition method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a system for transmitting a television program, and particularly before and after a commercial signal when transitioning from a normal television broadcast to a commercial broadcast. An information signal that can identify the start and end of the commercial program is sent to the first 1H of the video section at the end of the vertical blanking period.
And an identification information superimposition method for superimposing and transmitting the information.

[Conventional technology]

In conventional television broadcasting, when switching from a normal program broadcast to a commercial signal, the video signal is simply switched between each other using the vertical blanking period. Up to this point is a normal program video, and it has not been possible to determine on which part the commercial video is superimposed. And
The method of determining this has been conventional.

[Problems to be solved by the invention]

As described above, conventionally, information for distinguishing between a normal program video and a commercial video is not superimposed before and after. For example, when the video is recorded on the receiver side, a normal really necessary program is used. Even if you want to record only the video, there is a problem that even the video is unavoidably recorded at the time of the commercial broadcast. Originally, commercial signals are often unnecessary at the time of recording.

[Means for Solving the Problem] An identification information superimposing method according to the present invention employs a synchronizing signal separating means for separating a synchronizing signal from a first television signal, and a vertical synchronizing signal from the synchronizing signal separated by the synchronizing signal separating means. Vertical synchronization means for detecting a signal section, and 1H-th detection means for detecting the 1Hth, which is the first horizontal operation period of the video section in which the vertical blanking period has ended, from the vertical synchronization detection signal detected by the vertical synchronization means. Have. Further, the television signal and the 1H detection signal obtained from the 1H detection means are used as input signals, and the 1H detection signal is used to clean the 1H video signal section of the television signal to thereby produce a second television signal. 1H cleaning means for outputting a first program switching control means, and first digital identification information which is controlled by the 1H detection signal and generates first digital identification information for identifying the start of a commercial program in the 1H detection signal section. Identification program generating means, second program switching control means, and second digital identification information generating second digital identification information for identifying the end of the commercial program in the 1H detection signal section under the control of the 1H detection signal.
And identification pattern generating means. Then, the second television signal obtained from the 1H-eye cleaning means, the first digital identification information obtained from the first identification pattern generation means, and the second digital identification information obtained from the second identification pattern generation means are used. As the input signal, the first digital identification information and the second digital
Identification information superimposing means for superimposing the digital identification information in accordance with the second program switching control signal and outputting as a third television signal.

[Operation] In the present invention, when a broadcast program is recorded, during a commercial broadcast time zone, this section is skipped and recorded, so that the original program video can be continuously recorded so that the program transmission side can be used. An identification signal is superimposed on the 1H of the first video section at the end of the vertical blanking period just before and immediately before the start of the commercial broadcast program, and the original program video and the commercial video are discriminated on the video signal and transmitted.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

 FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, reference numeral 1 denotes a sync separator, which constitutes a separating means for separating a sync signal from a commercial television signal. Reference numeral 2 denotes an integration circuit, 3 denotes a vertical synchronization detection circuit having an output of the integration circuit 2 as an input, 4 denotes a waveform shaper connected to the output side of the vertical synchronization detection circuit 3, and 5 denotes an output of the waveform shaper 4. These are the 22H detectors which receive the input, and integrate the synchronization signal separated by the separation means, detect the vertical synchronization panel in the vertical blanking period, and then detect the first 1H, that is, the 22H, of the video section. It constitutes means for detecting. Reference numerals 6 and 7 denote waveform shapers, each of which constitutes a means for determining one field section in which program identification information is superimposed by using an externally supplied normal program → commercial program switching signal and commercial program → normal program switching signal as a trigger. I have. 8 and 9 are the output of the 22H detector 5 and the output of the waveform shaper 6 and 2 respectively.
A gate circuit for inputting the output of the 2H detector 5 and the output of the waveform shaper 7, 10 is a program start information generator 11 is a program end information generator, and these generate information for identifying the start and end of a commercial program. Means. 12 is a 22H cleaner for inputting the commercial television signal and the output of the 22H detector 5,
A mixer 13 receives the output of the 22H cleaner 12 and the outputs of the program start information generator 10 and the program end information generator 11 as inputs. These mixers clean the 22H video signal on which the program identification signal is superimposed. Here, means for mixing and superimposing the program identification signals is provided.

When transmitting a commercial program in the broadcast of a television program, before and after that, information for identifying the start and end of the commercial program is superimposed on the first 1H of the video section at the end of the vertical blanking period and transmitted. It is configured to be.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIGS.
This will be described with reference to FIGS.

2 (a) to 2 (i) show waveform diagrams of respective parts of the block diagram shown in FIG. 1, FIG. 3 is an explanatory diagram showing an example when program identification information is superimposed on 22H, FIG. FIG. 2 shows the waveform diagram shown in FIG. 2 as viewed over a long period of time.

First, in FIG. 1, a commercial television signal A (see FIG. 2A) is branched into two, and one is added to a sync separator 1 to branch only a sync signal, as shown in FIG. 2B. Obtain a signal b with a simple waveform. Then, when this signal b is integrated by the integrating circuit 2 connected to the next stage, it becomes a signal C having a waveform as shown in FIG. 2C, and the pulse width of the vertical synchronization pulse is changed to other horizontal synchronization and vertical equalization. Since the pulse width is much larger than the pulse width, the voltage of only the vertical sync pulse portion is accumulated and exceeds the threshold level A of the next vertical sync detector 3, resulting in a waveform as shown in FIG. Is obtained.

Next, the detection signal d is once shaped by the waveform shaper 4 to obtain a signal E having a waveform as shown in FIG. 2 (e).
Then, the signal is added to the 22H detector 5 and the falling of the signal E is used as a trigger to obtain a 22H detection signal having a pulse width α (see FIG. 2 (f)). The pulse width α is selected to be about one video signal section {1H− (horizontal synchronization signal width + front porch width + back porch width)}.

Next, one of the 22H detection signals is supplied to the 22H cleaning unit 12, and the first video signal section 22H immediately after the end of the vertical blanking period of the commercial television signal A is crushed to clean the video signal. 2 A signal having a waveform as shown in FIG.

On the other hand, a normal program → commercial program switching signal (see FIG. 4 (c)) and a commercial program → normal program switching signal (see FIG. 4 (d)) supplied from the outside are respectively used by the waveform shaper 6 and the waveform shaper 6. In addition to the shaper 7 as a trigger, a signal signal having a waveform as shown in FIG. 4 (m) and a signal signal having a waveform as shown in FIG. 4 (f) are obtained.
4 (e) and 4 (f).
The pulse width of the pulse width β is selected in the time of about one field section.

In FIG. 4, (x) indicates a pulse to be generated in the waveform (f) in FIG.
The pulse for generating the waveform (ta) in the figure is shown.

Also, c indicates a normal program, d is a video signal section, e is a vertical blanking period, f is a video signal, g is a synchronization signal,
h indicates one field section, i indicates a program switching signal from a normal program to a commercial program, and j indicates a program switching signal from a commercial program to a normal program.

Then, a gate signal 8 and a gate circuit 9 are added to the signals M and K having the waveforms as shown in FIGS. 4 (e) and 4 (f), respectively, to obtain a 22H detection signal (see FIG. 2 (f)). Gating is performed to obtain signals having waveforms as shown in FIGS. 4 (g) and 4 (h).

Next, using the signal and the signal as triggers, the program start information generator 10 obtains a commercial program start identification information and the program end information generator 11 obtains a commercial program end identification information (FIG. 2 (g)). reference).

Then, these program identification information is supplied to the mixer 13,
FIG. 2 (i) in which the 22H video signal is superimposed on the 22H of the cleaned commercial television signal (see FIG. 2 (h)).
A signal having a waveform as shown in FIG.

FIG. 3 shows a method of superimposing the program identification information on the 22nd line.

In FIG. 3, (a) shows how to use the time of the 22nd hour. Only the program identification information signal is used as the superimposed signal. A space is left for switching control on the receiving side. In FIG. 3 (a), a-1 indicates a program identification information superimposed section, a-2 indicates a switching / control section, and a
-3 indicates horizontal synchronization, a-4 indicates a back porch, a-5 indicates a pedestal level, a-6 indicates a front porch, and a-7 indicates a video signal.

FIG. 3 (b) shows an example of superposition of the program identification information, which is divided into 6 digital bits and divided into A, B, C, D, E, and F, respectively. Here, the code 101101 is shown. . Here, the white level is “1” as the digital level.
Level and the black level is set to “0” level. In FIG. 3 (b), b-1 indicates a white level, and b-1
-2 indicates a black level (pedestal level).

Note that the 22nd H on which the program identification signal is superimposed is the portion where the video signal is superimposed first in the video section, but even if one of the 525 operation lines is missing (at the top of the screen), Has almost no effect. Furthermore, since it is the moment of switching of the normal program commercial program, it can be said that there is no problem at all from the inertia of the eyes.

〔The invention's effect〕

As described above, according to the present invention, only the two switching signals at the time of the normal program broadcast commercial broadcast switching currently being performed are supplied from the outside, so that the 22Hth of the video signal is detected and cleaned. By superimposing and transmitting the commercial program start (or end) identification signal in this section, the receiving side detects and controls these identification signals, so that the recording can be performed without depending on the image reproducing function of the receiving side. This has the effect of skipping commercial programs and continuously recording only the original program video.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2 (a) to 2 (i) are waveform diagrams of respective parts in FIG. 1, and FIG.
4A to 4J are explanatory diagrams showing details of an example when the program identification information is superimposed on an eye, and FIGS. 4A to 4J are views of the waveform diagram of FIG. 2 over a long period of time. 1 ... Sync separator, 2 ... Integration circuit, 3 ... Vertical synchronization detection circuit, 4 ... Waveform shaper, 5 ... 22H detector, 6,7 ...
Waveform shaper, 8, 9 gate circuit, 10 program start information generator, 11 program end information generator, 12 22H cleaner, 13 mixer.

Claims (1)

(57) [Claims] A synchronizing signal separating unit for separating a synchronizing signal from the first television signal; a vertical synchronizing unit detecting a vertical synchronizing signal section from the synchronizing signal separated by the synchronizing signal separating unit; Means for detecting the first horizontal operation period, which is the first horizontal operation period of the video section in which the vertical blanking period has ended, from the vertical synchronization detection signal detected by the means; Be
A first-H cleaning means for receiving a first-H detection signal as an input signal, cleaning the first-H video signal section of the television signal with the first-H detection signal, and outputting a second television signal; Switching control means and first identification pattern generation means controlled by the 1H detection signal to generate first digital identification information for identifying the start of a commercial program in the 1H detection signal section; Control means and second identification pattern generating means controlled by the 1H-h detection signal to generate second digital identification information for identifying the end of the commercial program in the 1H-h detection signal section; and The obtained second television signal and the first digital identification information obtained from the first identification pattern generation means and the second digital signal obtained from the second identification pattern generation means. The second digital identification information is used as an input signal, and the first digital identification information and the second digital identification information are added to the second television signal by the first program switching control signal and the second digital identification information. And an identification information superimposing unit that superimposes and outputs the third television signal in accordance with the program switching control signal.