KR940005843B1 - Cm-cutting circuit & method - Google Patents

Abstract

The cutting off method comprises a CM character recognition means (80) differenciating the output signals of a demodulator (10) and comparing the differenced signals with the first reference voltage to integrate the compared signals; a program character recognition means (90) adding the output signals of the demodulator (10) and the delayed signals of the demodulator (10) to compare the added signals with the second reference voltage; a microprocessor (60) cutting off the commercial message when the CM character recognition means (80) is activated.

Description

Commercial cut circuit and method for reservation recording

1 is a circuit diagram of the present invention.

2 is an implementation flowchart of the present invention.

3 and 4 are waveform diagrams for explaining the present invention.

5 is a screen display of commercials.

* Explanation of symbols for main parts of the drawings

5: tuner 10: demodulator

15: Differential 20, 30, 40: Comparator

25: Integrator 35: Adder

45: 1 field delay 50: Inverter

60: micom 70: recording process

75: head 80: advertising confirmation unit

90: program title confirmation unit

The present invention relates to a VCR with a reservation recording function, and to a commercial recording cut circuit and a method for making a reservation recording so that only a commercial can be cut during reservation recording and only the main broadcast can be recorded. The recording pause state is maintained, and the normal recording state is maintained when the commercial ends.

Currently, Korean broadcasters send a large amount of commercials in front of and behind programs when broadcasting any program, so unnecessary commercials are recorded together with the reservation recording using the VCR. Was.

Therefore, the user can set the scheduled recording time to record from 7:05 to 8:05 pm when recording a drama broadcast from 7:00 PM to 8:00 PM so that commercials are not recorded. In some cases, a desired program cannot be recorded depending on the length of time of the commercial.

Therefore, it is common to set the time as about 6: 55-8: 05 when recording a drama up to 7: 00-8: 00, and usually take the inconvenience of recording a commercial when making a reservation recording using a VCR.

Therefore, when playing a scheduled recording program, the advertisement broadcast is played back and forth of this program, and the recording time of the desired program is set.

In view of the above, the present invention allows the program to record only the desired program without recording the commercial when the scheduled recording of the VCR is recorded, so that only the program without the commercial is recorded. Because it is displayed as, it is detected so that the commercial recording is paused and the commercial recording is completed when the commercial is finished.

As described above, the configuration and operation effects of the present invention for the purpose of cutting the recording of the commercial during the recording of the drug will be described in detail as follows.

According to the present invention, in a VCR in which a composite video signal received by the tuner 5 and demodulated by the demodulator 10 is recorded by the recording processor 70 through the head 75 under the control of the microcomputer 60, the demodulator ( 10) is provided with an advertisement character confirmation unit 80 for outputting a confirmation signal for confirming the OSD advertisement character on the screen by differentiating the output of 10) and comparing the output with the reference voltage by integrating the comparison output. And a program title confirmation unit 9 for delaying the output of 10) by one field, inverting it, adding it to the output of the demodulator 10, and outputting a confirmation signal for confirming the program title by comparison with a reference voltage. The microcomputer 60 recognizes the output of the confirmation unit 80 and the program title confirmation unit 90 and controls the recording operation of the recording process 70.

In this case, the advertisement character checking unit 80 may compare the differential output of the differentiator 15 with which the complex video signal is differentiated, the comparator 20 for comparing the differential output of the differentiator 15 with a reference voltage, and the comparison output of the comparator 20. An integrator 25 for integrating and a comparator 30 for outputting an advertisement text confirmation signal by comparing the integral output of the integrator 25 with a reference voltage, and the program title checking unit 90 includes one field of a composite video signal. (Field) The field delay unit 45 for delaying, the inverter 50 for inverting the delay output of the field delay unit 45, the output of the inverter 50 and the original composite video signal are added. An adder 35 and a comparator 40 for outputting a program title confirmation signal by comparing the adding output of the adder 35 with a reference voltage.

The microcomputer 60 detects the advertisement character confirmation signal and the program title confirmation signal when the scheduled recording start time is reached, and when the advertisement character confirmation signal or the program title confirmation signal is applied at the reservation recording start time, the recording is paused and the program title. Proceed with normal recording when the confirmation signal does not go away.

In the present invention having such a configuration, the tuner 5 receives a broadcast RF signal and applies it to the demodulator 10 as an intermediate frequency signal, and the demodulator 10 demodulates it into audio and video signals to record a composite video signal. ) Is applied to the advertisement character confirmation unit 80 and the program title confirmation unit 90.

Here, the recording process 70 allows the composite video signal to be recorded in the head 75 by the microcomputer 60 and the recording control signal input, and the advertisement text confirming unit 80 displays the OSD text of the advertisement sponsor name before the program is broadcasted. It determines that it is displayed on the screen and issues a recording command to the process 70, and checks the advertisement text confirmation signal and the program title confirmation signal from the advertisement character confirmation unit 80 and the program title confirmation unit 90.

In this case, when the name of the advertiser is displayed as the OSD character as shown in FIG. 5 (a), if the composite video signal demodulated by the demodulator 10 is the same as in FIG. 3 (a), the square wave (advertiser) as shown in FIG. The OSD characters to display the name of the display will be mixed.

When the derivative is differentiated in the differentiator 15, a differential waveform as shown in FIG. 3 (c) is output to the comparator 20. When the comparator 20 compares the reference voltage and the differential waveform shown in FIG. In 20), a waveform as shown in FIG. 3 (d) is output.

In this case, when the name of the advertiser is not displayed, the OSD text does not appear and there is no pulse output from the comparator 20.

The comparison output of the comparator 20 (see FIG. 3 (d)) is applied to the integrator 25, changed into an integrated waveform as in FIG. 3 (e), and then applied to the comparator 30 and the comparator 30 In comparison with the reference voltage shown in FIG. 3 (e), the advertisement character confirmation signal of the high level is applied to the microcomputer 60.

That is, the output of the advertisement character checking unit 80 becomes high level only when the name of the advertiser is displayed as shown in FIG. 5 (a), and becomes low level when the name of the advertiser is not displayed as the OSD character.

In the microcomputer 60, when the output of the advertisement character confirmation unit 80 is applied at a high level (the advertiser's name is displayed as OSD characters), the microcomputer 60 determines that the advertisement is being broadcast and gives a recording pause command to the recording process 70. To make the recording paused.

Also, when the screen like Fig. 5 (a) disappears and the commercial starts, the title of the program is displayed as OSD text on the upper right side of the screen as shown in Fig. 5 (b), which becomes a video signal as shown in Fig. 4 (a). At this time, the OSD characters indicating the title of the program are in the same horizontal period.

The waveform as shown in FIG. 4 (a) is applied to the first field retarder 45 to be delayed by 30 Hz and output as shown in FIG. 4 (b), which is applied to the inverter 50 to show in FIG. 4 (c). Will be reversed.

The waveform such as the fourth (c) diagram, which is the output of the inverter 50, is applied to the adder 35 and added to the original composite video signal such as the fourth (a) diagram output from the demodulator 10, thereby adding the fourth (d). A waveform like) is created.

Here, if the original signal waveform and the waveform inverted by one field delay are added, the waveform as shown in FIG. 4 (d) is output because the title portion of the program is constant regardless of the screen change, and the advertisement screen is continuously changed. to be.

When the output of the adder 35 (waveform in FIG. 4 (d)) is applied to the comparator 40 and compared with the reference voltage shown in FIG. 4 (d), the comparator 40 repeatedly repeats the title of the program. It will output a high pulse, which lasts until the title of the program disappears and the program is broadcast.

Therefore, in the microcomputer 60, when the high level is received by the advertisement character checking unit 80, the recording pause state is set. In the program satisfaction checking unit 90, when a high pulse is periodically applied (the title of the program is the OSD character, the right side of the screen). When the display is displayed at the top and the commercial continues, the recording pause state is maintained, but if the high pulse is not periodically applied by the program title checking unit 90, the recording pause state is released to allow normal recording to proceed. As it progresses, it is possible to record a program whose commercial has been cut.

Referring to the flowchart of FIG. 2, the microcomputer 60 determines whether the scheduled recording start time is reached, and when the scheduled recording start time arrives, the recording command is transmitted to the recording process, but the high level is not recorded in the advertisement character checking unit 80. When a high pulse is periodically applied by the program title checking unit 90, the recording pause state is maintained. Otherwise, the recording pause state is released to allow normal recording to proceed.

As described above, the present invention is applied only when recording a broadcast program in Korea, and it is not possible to cut only the commercial broadcast before the program broadcast and the commercial after the program broadcast, but the commercial broadcast after the program has no meaning because the present invention There will be no problems with the implementation.

In other words, the commercial after the program broadcast can be easily deleted even if recorded, the present invention can record only the program is cut so that the commercial is not recorded when the commercial broadcast before the program airtime recording during the scheduled recording of the VCR will be.

Claims (4)

In the VCR in which the composite video signal received by the tuner 5 and demodulated by the demodulator 10 is recorded through the head 75 in the recording process 70 under the control of the microcomputer 60, the demodulator 10 After the output is differentiated and compared with the reference voltage, the comparison output is integrated with the reference voltage, and the advertisement text confirmation unit 80 outputs a confirmation signal for confirming the advertisement text on the screen. It is provided with a program title confirmation unit 90 for delaying one field delay and inverting and adding it to the output of the demodulator 10, and outputting a confirmation signal for confirming the title of the program in comparison with a reference voltage. And a microcomputer 60 for recognizing the output of the program title check unit 90 to control the recording operation of the recording process 70. The method of claim 1, wherein the advertisement character checking unit 8 comprises a differentiator 15 for differentiating a composite video signal, a comparator 20 for comparing the differential output of the differentiator 15 with a reference voltage, and the comparator 20 The integrator 25 for integrating the comparison output of the control unit; and the comparator 30 for outputting the advertisement character confirmation signal by comparing the integral output of the integrator 25 with a reference voltage. Circuit. 2. The program title check unit 90 according to claim 1, wherein the program title checking unit 90 includes a one field delay unit 45 for delaying one field of the composite video signal and an inverter for inverting the delay output of the one field delay unit 45. 50), an adder 35 for adding the output of the inverter 50 and the original composite video signal, and a comparator 40 for outputting a program title confirmation signal by comparing the adder output of the adder 35 with a reference voltage. Commercial cut circuit during reservation recording, characterized in that consisting of. In a VCR having a scheduled recording function, if an advertisement character confirmation signal of the advertisement character confirmation unit 80 is detected at the scheduled recording start time, a process of maintaining a recording pause is performed, and a program title confirmation unit ( If the program title confirmation signal of 90) is periodically detected, the recording pause state is maintained, and if the program title confirmation signal is not detected, the recording pause state is released to perform the recording operation. Commercial cut way.