JPH04372756A - Video tape recorder - Google Patents

Abstract

PURPOSE:To enable to see and listen by skipping a CM part by confirming the sound mode control signal of a multiplexing sound signal received and modulated with an built-in tuner and recording the signal on a magnetic tape when a stereo mode signal is detected. CONSTITUTION:The video signal of a television broadcasting received with a tuner part 11 is recorded in the video recording mode of a VTR on the video signal track 31 of the magnetic tape 30 with a magnetic head mounted on a rotary cylinder through a record amplifier. Then, a vertical synchronizing signal is separated from the video signal outputted from the tuner part 11 and the rotation of the rotary cylinder mounted on the magnetic head recording the above-mentioned video signal is synchronized and also a synchronous pulse synchronized with the synchronous signal is generated and it is recorded on a control track 32 arranged at the bottom edge of the magnetic tape 30 with the magnetic head 15 for recording and reproduction.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] When the audio mode control signal of the TV broadcast multiplexed audio signal received by the built-in tuner is in stereo mode, a binary "1" signal is superimposed on the synchronization signal recorded on the control track of the magnetic tape. The present invention relates to a video tape recorder which, when the same signal is detected in playback mode, fast-forwards until a signal other than the same signal is detected.

0002

[Prior Art] When or during recording of a TV broadcast movie program received by a built-in tuner, the audio mode control signal of the multiplexed audio signal of the TV broadcast demodulated by the tuner is checked, and the same control signal is When detecting that the is in stereo mode, the video tape recorder (hereinafter abbreviated as VTR)
The recording operation of the VTR is temporarily stopped, and when the control signal changes to a mode other than stereo mode, the recording operation of the VTR is resumed.

0003

[Problem to be Solved by the Invention] Pausing the recording operation when the audio mode control signal of the multiplexed audio signal is in the stereo mode is effective when stopping a commercial broadcast (hereinafter abbreviated as CM) inserted in the middle of a movie program, etc. It is intended for recording with the exception of However, although it is a commercial, it can be used as a valuable source of information depending on the intention of the viewer, and unrecorded commercials cannot be played. The present invention is based on C
All broadcast signals, including CM, are recorded once, and during playback, the same commercials can be automatically skipped or played back according to the viewer's specifications.

0004

[Means for solving the problem] In the recording mode of the VTR, the audio mode control signal of the multiplexed audio signal received and demodulated by the built-in tuner is checked, and when a stereo mode signal is detected, the received video signal and audio signal are At the same time as recording on the tape, a signal of binary number "1" is continuously recorded superimposed on the synchronization pulse recorded on the control track of the magnetic tape, and when a signal other than the stereo mode is detected, a signal of binary number "0" is recorded. Continuously record the signal. During playback of the magnetic tape, in the skip operation mode specified by the key operation of the VTR or remote control transmitter, when a binary ``1'' signal is detected in the synchronization signal read from the control track of the magnetic tape, then ``2'' is detected. Base number “
The magnetic tape is fast-forwarded until a signal of "0" is detected.

[0005]

[Operation] In the recording mode of the VTR shown in the block diagram of main parts in FIG. (not shown), the video signal is recorded on the video signal track 31 of the magnetic tape 30 shown in the schematic diagram of FIG. Separates a vertical synchronization signal from the video signal output from the tuner section 11, synchronizes the rotation of a rotating cylinder (not shown) equipped with a magnetic head for recording the video signal, and generates a synchronization pulse synchronized with the synchronization signal. Then, data is recorded on a control track 32 disposed at the lower end of the magnetic tape 30 by a magnetic head 15 for both recording and reproduction.

FIG. 2 shows the frequency structure of the multiplexed audio signal of television broadcast received by the tuner section 11. In the figure, the audio mode of the multiplexed audio signal is represented by an audio mode control signal that amplitude modulates a subcarrier with a frequency of 55.125 kHz. That is, when the audio mode control signal for modulating the subcarrier is a 982.5 Hz sine wave, it is a stereo mode in which the sum signal of the left and right audio channels is the main channel, and the difference signal between the left and right audio channels is the subchannel. , 922.5Hz sine wave indicates a bilingual mode in which the main channel is Japanese and the sub channel is a foreign language. Further, when the subcarrier is not modulated or the subcarrier does not exist, it indicates a monaural mode of only the main channel.

The tuner unit 11 detects the audio mode control signal of the multiplexed audio signal received, switches the audio signal demodulated from the multiplexed audio signal, and supplies the demodulated audio signal to an audio amplification unit (not shown). According to the control procedure shown in FIG. 5, the control unit 17 which branches and supplies the mode control signal continuously outputs a binary "1" signal in the stereo mode while the control signal in the stereo mode continues. When the audio mode control signal is in a mode other than the stereo mode, a binary "0" signal is continuously output, the duty ratio of the synchronizing pulse is modulated and superimposed, and the signal is recorded on the control track 32 of the magnetic tape 30. That is, as shown in the pulse waveform diagram of FIG. 4, the rising edge of the synchronizing pulse is made to correspond to the start position of the recording track of the video signal, and the relative position of the falling edge with respect to the rising edge is changed,
Record the digital signal "0" or "1".

Magnetic tape 30 on which the synchronization pulse is recorded
In the playback mode, the video signal is read and played back from the video signal recording track 31, and the magnetic head 1
5, the recording synchronization pulse is read out to the control track 32. A digital signal superimposed on the synchronizing pulse is extracted from the synchronizing pulse, and inputted to the control unit 17, according to the control procedure shown in FIG. Check whether the skip operation flag specified by the device 20 has been set. If the skip flag is ON and the digital signal is "1", a fast-forward control signal 17a is output to put the VTR in a fast-forward state, and if it is "0", a playback control signal 17a is output and the VTR is activated. is in the playing state.

[0009]

[Embodiment] An operation signal generated by key operation provided in the key input section 18 of the VTR of the present invention is supplied to the control section 17, and the control section 1
The input operation signal is decoded in step 7, and the control signal 17a specified by the operation signal is outputted to control the corresponding controlled circuit. Further, a remote control signal outputted by the remote control transmitter 20 by operating a key provided in the remote control transmitter 20 is received by a remote control signal receiving section 19 provided in the VTR, and a demodulated and output remote control signal is supplied to the control section 17. , similarly to the operation signal output from the key input section 18, is decoded by the control section 17 and outputs a designated control signal 17a.

[0010] A TV broadcast signal inputted to the antenna input terminal 10 of the VTR is transmitted to a tuner unit 11 for receiving the TV broadcast.
and a control signal 17a output from the control section 17.
The broadcast signal of the specified channel is selected, demodulated, and output as a video signal and an audio signal. In the recording mode of the VTR, the video signal output from the tuner section 11 is supplied to the synchronization separation section 12, and a rotating cylinder (not shown) equipped with a magnetic head records the video signal using a synchronization signal separated from the video signal. At the same time, the synchronous signal is supplied to the recording amplification section 13, a synchronous pulse synchronized with the synchronous signal is outputted, and the synchronous pulse is sent to the recording/reproducing magnetic head via the recording/reproducing switch 14. 1
5 and recorded on the control track 32 of the magnetic tape 30 shown in FIG.

On the other hand, the subcarrier of the audio mode control signal of the multiplexed audio signal obtained by demodulating the received signal in the tuner section 11 is separated through a filter, and detected to discriminate the signal modulating the same subcarrier. Using the generated audio mode signal, the mode of the audio signal obtained by demodulating the multiplexed audio signal is switched and outputted, and the audio mode signal is supplied to the control section 17. The control unit 17, which has received the audio mode signal, determines the audio mode signal according to the control procedure shown in FIG. It is supplied to the recording amplification section 13 of. If the audio mode signal input to the control section 17 is a signal other than the stereo mode, it outputs a binary "0" digital signal.

The recording amplification unit 13 which receives the digital signal modulates and outputs the duty ratio of the synchronizing pulse as shown in FIG. The signal is supplied to the magnetic head 15 via the switch 14, and is recorded at a position on the control track corresponding to the recording start position of the video signal recording track 31 of the magnetic tape 30 by the rotary head. The control code is such that a digital signal of "1" or "0" is continuously recorded depending on whether the audio mode of the received broadcast signal is stereo mode or not as long as the respective audio mode continues. The corresponding digital signals may be repeatedly recorded ten or more times from the time when the stereo mode or a mode other than the stereo mode is detected.

In the reproduction mode of the magnetic tape 30 in which the digital signal in the audio mode is recorded by being superimposed on the synchronization pulse together with the video signal received by the tuner section 11,
After confirming the operation signal for the skip operation specified by the key input unit 18 or the remote control transmitter 20, the control unit 17
Set a flag for the same skip operation in the memory within. The recorded signal on the video signal recording track 31 of the magnetic tape 30 is read out and the video signal is reproduced, and the magnetic head 15 reads the recorded signal on the video signal recording track 31 of the magnetic tape 30.
2 reads the recording synchronization signal, supplies it to the reproduction amplification unit 16 via the recording/reproduction changeover switch 14, reproduces the synchronization pulse, reproduces a digital signal superimposed on the synchronization pulse, and supplies it to the control unit 17. do.

According to the control procedure shown in FIG. 7, the control section 17 checks whether the skip operation flag specified by the key input section 18 or the remote control transmitter 20 has been set in the playback mode of the VTR, and confirms that the input digital signal is "1"
If so, the control unit 17 sends a fast forward operation control signal 17a.
is output, the VTR is put into a fast forward state, and the magnetic tape 30 is run at high speed. If the input digital signal is "0" in the fast forward state of the magnetic tape 30, a control signal 17a for playback operation is output, and the VTR
is set to a reproduction state, and a video signal read and reproduced from the video signal recording track 31 of the magnetic tape 30 is output.

[0015]

As described above, when recording a bilingual broadcast or a monaural broadcast movie program, etc., the magnetic tape is fast-forwarded by the recording skip start signal on the control track of the magnetic tape during the commercial part of the stereo broadcast, and the skip is ended. It is possible to return to the playback state by a signal and watch the commercial part by skipping it. The skip start signal and the skip end signal are not codes that take time to read and decipher, but are simple binary numbers "1" and "0", so they can be detected quickly and unnecessary images due to detection delays can be output. Also, there is no need to cut off the beginning of the necessary video. Furthermore, by stopping the skipping operation by operating a key on the VTR or remote control transmitter, it becomes possible to view the CM part as well.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of main parts of a video tape recorder of the present invention.

FIG. 2 is a frequency configuration diagram of a multiplexed audio signal for television broadcasting.

FIG. 3 is a schematic diagram of recording tracks on a magnetic tape.

FIG. 4 is a pulse waveform diagram of a signal recorded on a control track.

FIG. 5 is a flowchart of control code recording in recording mode.

FIG. 6 is a flowchart of control code identification and control in playback mode.

[Explanation of symbols]

11 Tuner section 12 Synchronization separation section 15 Control track recording/reproducing magnetic head 1
7 Control section 18 Key input section 19 Remote control signal receiving section 20 Remote control transmitter 30 Magnetic tape 32 Control track

Claims (1)

[Claims] 1. A tuner section for receiving television broadcast signals, wherein when recording video and audio signals received and demodulated by the tuner section, the audio mode control signal of the multiplexed audio signal demodulated by the tuner section is set to stereo mode. 2, superimposed on the synchronization signal recorded on the magnetic tape control track
Continuously records a binary ``1'' signal, continuously records a binary ``0'' signal when in a mode other than stereo mode, and controls the remote control transmitter via the key input section or remote control signal receiving section in the same magnetic tape playback mode. When a skip operation is specified by the output signal, a fast-forward operation is performed when a binary "1" signal is detected in the synchronization signal read from the control track, and a playback is performed when a binary "0" signal is detected in the same fast-forward operation state. A video tape recorder characterized by being able to return to operation.