JPH06303569A - Method and device for recording and reproducing text television signal - Google Patents

Abstract

PURPOSE:To obtain a recording and reproducing device capable of eliminating a part other than a prescribed broadcast content such as a commercial message when a text television signal is recorded. CONSTITUTION:This device is equipped with a text television signal processing circuit 5h which discriminates the text television signal of television broadcast, a signal recording circuit 6 which records the television signal on a recording medium continuously, and a timer means which sets recording time. Also, it is equipped with a means 13 which controls the turning on/off of a recording operation based on the discrimination information of the text television signal in set time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is adapted to receive a television broadcast, record the received contents for a predetermined time, and reproduce the recorded contents when necessary. The present invention relates to a recording / reproducing apparatus for a character multiplex television signal such as a video tape recorder (hereinafter referred to as VTR) or a digital analog tape deck (hereinafter referred to as DAT).
The present invention relates to a technique for recording the contents of a program in which commercials are fragmentarily inserted in a broadcast program while removing the part other than the predetermined broadcast.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional commercial elimination V.
It is a block diagram which shows an example of TR. In the figure, 1
a is a clock circuit for measuring the current time,
The output is given to the input terminal of the digital comparator 1b. A channel program circuit 1c stores a recording start time, a recording end time, a recording reception channel, etc. for reserved recording, and its output is given to the input terminal of the digital comparator 1b. 1d
Is a TV signal / audio multiplex mode designating circuit for recording mode designating information, and the output thereof is the digital comparator 1b.
Given to the input end of. The storage contents of the channel program circuit 1c and the TV signal audio multiplex mode designating circuit 1d are set by the user operating the setting key 1e.

Reference numeral 1f is a memory circuit for storing the reserved recording mode, to which the output of the digital comparator 1b is given, and this memory circuit 1f is constituted by, for example, a flip-flop, the output of which is the 3rd input AND gate 4 1 is applied to the input terminal. A cassette switch 2 and a reserve switch 3 are inserted between the second input end of the AND gate 4 and the power supply and between the third input end and the power supply, respectively. The cassette switch 2 is for detecting whether or not a cassette tape is loaded,
It is normally open (OFF) and closed (ON) when the cassette tape is loaded. Also, reserve switch 3
Is a switch that is turned on by the user when performing reservation recording.

The output of the AND gate 4 is given to the channel receiving circuit 5, the signal recording circuit 6, the video signal output circuit 7 and the mixing circuit 8. The channel receiving circuit 5
Is a tuner unit 5a, a video intermediate frequency amplifier circuit (hereinafter,
VIF 5b, audio intermediate frequency amplification circuit (hereinafter,
SIF) 5d, a video detection circuit 5c, and an audio multiplex signal processing circuit 5e including an audio detection circuit 5f and a control signal detection circuit 5g, and selects a predetermined channel signal from the television signals received from the antenna. Then, the video signal is output from the video detection circuit 5c and the audio signal is output from the audio detection circuit 5f. The output video signal and audio signal are given to the rotary magnetic head 9 via the signal recording circuit 6. Further, the control signal detection circuit 5g detects the voice mode from the voice multiplexed signal extracted from the SIF and outputs the control signal.

Reference numeral 10 is an analog switch for switching the signal path between the recording mode and the reproducing mode. The output of the channel receiving circuit 5 in the recording mode and the output of the signal reproducing circuit 11 in the reproducing mode are output as video signals. It is switched to feed circuit 7. The output of the video signal output circuit 7 is given to one input terminal of the mixing circuit 8.
The output of the mixing circuit 8 is given to a display device such as a color television receiver.

The output of the AND gate 4 is further supplied to a sequence circuit 13 via an OR gate 12. The sequence circuit 13 outputs the output signal of the AND gate 4 and a microcomputer (not shown) for designating a mode in advance. The rotary magnetic head 9 according to the command
And the operation of its drive mechanism (not shown) and the operations of the signal recording circuit 6 and the signal reproducing circuit 11.

Next, the operation of the above configuration will be described.
A recording start time, an end time, and a predetermined channel at a predetermined date and time of the broadcast to be recorded are set by the setting key 1e, and the contents are stored in the channel program circuit 1c. In addition, three modes of the broadcast to be recorded, which are the dual audio broadcast, the stereo broadcast and the monaural broadcast, are set by the setting key 1e, and the contents thereof are the TV signal audio multiplex mode designating circuit 1d.
Memorized in.

The current time measured by the clock circuit 1a,
The output of the channel program circuit 1c, the TV signal / audio multiplex mode designating circuit 1d and the information of the reception broadcast mode output from the control signal detection circuit 5g are constantly compared by the digital comparator 1b. In this digital comparator 1b, the coincidence between the recording start time from the channel program circuit 1c and the current time from the clock circuit 1a, the audio mode from the TV signal audio multiplex mode designating circuit 1d, and the audio from the control signal detection circuit 5g. When the mode coincidence is detected, the coincidence detection output of the digital comparator 1b is sent to the memory circuit 1f.
The state of f becomes "H", for example. Further, when the recording end time and the current time match, or when the audio mode from the TV signal audio multiplex mode designating circuit 1d does not match the audio mode from the control signal detecting circuit 5g,
The memory circuit 1 is output by the output of the digital comparator 1b.
The state of f is inverted and becomes, for example, “L”.

Now, when a cassette tape for recording is inserted, the cassette switch 2 is turned on, and the user further turns on the reserve switch 3 for reserved recording, the above-mentioned "H" period of the memory circuit 1f. In other words, during the period when the audio mode and the reception mode set from the recording start time to the recording end time match, the AND gate 4
Output becomes "H". By the "H" output of the AND gate 4, the channel receiving circuit 5, the signal recording circuit 6,
The video signal output circuit 7, the mixing circuit 8 and the sequence circuit 13 are operated.

That is, by the channel receiving circuit 5,
A broadcast in a predetermined audio mode on a predetermined channel is received, amplified, and detected. This channel receiving circuit 5
Is output to the video signal output circuit 7 via the analog switch 10. The output of the video signal output circuit 7 is given to the mixing circuit 8 and sent to a display device (not shown) such as a color television receiver. On the other hand, the output of the channel receiving circuit 5 is given to the signal recording circuit 6 and FM-modulated. The output of the signal recording circuit 6 is given to the rotary magnetic head 9 and recorded on the magnetic tape. At this time, the sequence circuit 13 is operating and the operation of the rotary magnetic head 9 and the drive mechanism related thereto is controlled.

[0011]

Since the conventional television signal recording / reproducing apparatus for removing a commercial such as a VTR is configured as described above, when the broadcast program and the commercial are the same audio signal, for example, the broadcast is performed. If the program is a stereo broadcast and the commercial is also a stereo broadcast, the commercial could not be removed.

The present invention has been made in order to solve the above-mentioned problems. Even if the broadcast program and the commercial have the same audio signal, the commercial is removed and only the predetermined broadcast program is accurately recorded. It is an object of the present invention to provide a character multiplex television signal recording / reproducing apparatus capable of performing the above.

[0013]

According to the present invention, a recording operation is input-controlled based on discrimination information of a character multiplex television signal within a set time. The present invention also provides a character-multiplexed television signal,
Further, the recording operation is controlled based on the discrimination of the blanking information of the video between the broadcast program and the commercial. Furthermore, the present invention controls the recording operation based on the discrimination of the character multiplex television signal, the blanking information of the image between the broadcast program and the commercial, and the discrimination of the mute information of the sound. is there.

[0014]

According to the present invention, by providing the means as described above, by detecting the presence or absence of the character multiplex television signal at the time of recording setting, the information added with the character multiplex television signal at the set time. It is possible to perform on / off control so that only the data is continuously recorded, and it is possible to record on the recording medium while removing a portion other than a predetermined broadcast content such as a commercial. According to the invention,
By detecting the blanking portion between the broadcast program and the commercial as the on / off control information, it is possible to perform more accurate on / off control. Furthermore, according to the present invention, the character-multiplexed television signal, the video blanking information, and the mute information, which is a non-voice portion between the broadcast program and the commercial, are detected as the on / off control information, so that more accurate input is performed. It is possible to control off.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Before describing an embodiment of the present invention with reference to the drawings, an outline of character multiplex broadcasting will be described below. The character multiplex broadcasting (closed caption) is a broadcasting system in which a caption signal (character information) synchronized with audio is multiplexed with a video signal to display subtitles. This allows people with hearing loss to understand and enjoy television broadcasting as well as healthy people.

The caption information is multiplexed, for example, on the 21st scanning line (line 21) of the video signal (see FIG. 7). An example of the multiplexed signal is shown in FIG. The data is 16-bit NRZ (non return value).
o zero) signal. 7 cycle clock run
In signal (sync signal for decoding data code)
Has a frequency of 503 KHz. The clock run-in signal and the data code are in phase. After the clock run-in signal, there are two bits of logic level "0", followed by one start bit (logic level "1"). The breakdown of 16-bit data is that there are two combinations of a 7-bit ASCII code and a 1-bit validity code. The character code is based on the ASCII code, and the character attribute for closed captions is used. Code to specify and code to control screen are added.

The codes to be transferred include a character code and a control code to which various commands are assigned. The control code consists of 2 bytes (16 bits) to form one command. In addition, two channels (two display modes) are secured by assigning data codes. For example, it is possible to send completely different information on the second channel while sending subtitle broadcast on the first channel.

Example 1. FIG. 1 is a block diagram showing an example of a VTR according to an embodiment of the present invention. In FIG. 1, 1a to 1c, 1e, 1f, 2 to 4, 5a to 5d, 5 are shown.
Since f and 6 to 13 are the same as those of the conventional example shown in FIG. 6, corresponding parts are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 1, 5h is a character multiplex signal processing circuit. The character multiplex signal processing circuit 5h detects the presence / absence of the character multiplex signal on the line 21 from the video signal taken out from the VIF 5b of the channel receiving circuit 5, and inputs its output to the digital comparator 1b. 1g is a TV signal character multiplex mode designating circuit, which stores mode designating information,
The output is input to the digital comparator 1b.

The character multiple signal processing circuit 5h is constructed, for example, as shown in FIG. In the figure, 14 is a sync separation circuit, which receives a signal from the VIF 5b and separates the sync signal. Reference numeral 15 is a vertical sync separation circuit, in which the sync signal separated by the sync separation circuit 14 is further separated in vertical sync. 16 is a horizontal counting circuit (hereinafter referred to as H.
COUNT), for example, "H" is output while the horizontal sync pulse input from the vertical sync separation circuit 15 rises and the horizontal sync pulse input from the sync separation circuit 14 counts from 21 to 22.

A field determination circuit 17 counts the number of horizontal synchronizing pulses in the vertical blanking period, and determines whether the received field is the first field or the second field depending on the difference in the number of pulses.
If it is the first field, for example, "H" is output if it is the first field. H. The outputs of the COUNT 16 and the field determination circuit 17 are input to the input end of a 2-input AND gate 19, and the output thereof is used as a control signal in the detection circuit 2
Given to 0. 18 is a bandpass filter (hereinafter, B
PF (1)), which takes out the clock run-in signal of 503 KHz from the input VIF signal and adds it to the detection circuit 20. The output of the detection circuit 20 is given to the digital comparator 1b as the output of the character multiplex signal processing circuit 5h.

Next, the operation of the above configuration will be described.
A channel program circuit 1c sets and stores a recording start time, an end time, and a predetermined channel at a predetermined date and time with a setting key 1e, and at the same time, a TV signal character multiplex mode designating circuit 1g sets and stores that the broadcast is character multiplex broadcasting Let These channel program circuits 1c and T
The output of the V signal character multiplex mode designating circuit 1g is always input to the digital comparator 1b.

On the other hand, in the character multiplex signal processing circuit 5h, the first field is detected by the field determination circuit 17, and the line 21 in the vertical blanking interval is always H.264. COUNT1
The clock which is counted by 6 and passed through the BPF (1) 18 to the line 21 of the first field in the detection circuit 20.
The presence / absence of a run-in signal (503 KHz) is detected, and information as to whether the received broadcast is a character multiplex broadcast is input to the digital comparator 1b as an output.

In this state, when the recording start time comes, the same operation as in the conventional example of FIG. 6 is performed, and the video signal and the audio signal of a predetermined channel are added to the signal recording circuit 6 to start the recording. However, if a broadcast such as a commercial that is not a character multiplex broadcast is inserted in the middle of the character multiplex broadcast, the output mode of the character multiplex signal processing circuit 5h and the setting mode of the TV signal character multiplex mode designating circuit 1g are compared by the digital comparator 1b. , And the state of the memory circuit 1f is inverted by the output of the digital comparator 1b, and this is added to the sequence circuit 13 to send a tape running stop signal to stop the advance of the tape. That is, the progress of the tape stops during the recording state,
A so-called recording pause state is set. Next, when the received broadcast becomes the character multiplex broadcast, the pause state is released and the recording operation is restarted.

Example 2. FIG. 3 is a block diagram showing a VTR according to the second embodiment of the present invention.
3 to 5a to 5h and 6 to 13 are the same as those in the conventional example shown in FIG. 6, corresponding parts are designated by the same reference numerals and detailed description thereof will be omitted. In FIG. 3, 5i is a blanking information processing circuit. This blanking information processing circuit 5
i detects blanking information (information such as fade-out and fade-in) broadcast between the commercial part and the program part in the video signal taken out from the VIF 5b of the channel receiving circuit 5, and outputs the 4-input AN.
Input to the first input terminal of the D gate 21. The three signals input to the three-input AND gate 4 shown in FIG. 2 are input to the second, third and fourth input terminals of the AND gate 21, respectively. A blanking mode switch 22 is a switch that can be switched to "H" by the user when the blanking information is not used as the determination information.

FIG. 4 is a diagram showing an example of the configuration of the blanking information processing circuit 5i. In the figure, reference numeral 24 denotes a video average value processing circuit 1, which is one of the input television signals.
The average value of several sampling points on the screen (for example, the five corners of the screen and the center of the screen) is output. An image average value processing circuit 2 has the same circuit operation as the image average value processing circuit (1) 24, and outputs an average value of the television signal delayed by one frame by the frame delay circuit 23. Reference numeral 26 denotes a difference circuit, which takes the difference between the two outputs of the image average value processing circuit (1) 24 and the image average value processing circuit (2) 25 and detects the monotonous increase / decrease detection circuit (1) 2
The output is given to 7. Monotonic increase / decrease detection circuit (1) 27
Determines that the difference value input from the difference circuit 26 monotonously decreases and that the black level continues for two frames or more, it is fade-out information, and outputs "L", for example. Also, if the difference value is a black level of 2 frames or more and then increases monotonically, it is determined to be fade-in information and, for example, "H" is output.

Next, the operation of the above configuration will be described.
When the broadcast program is switched to commercial, the image gradually becomes dark (hereinafter, referred to as fade-out information) and may be switched to commercial. At this time, the blanking information processing circuit 5i detects the fade-out information and outputs "L", for example. In this state, when the recording start time comes and the blanking mode switch 22 is switched to "H" by the user, recording is started, but when it is not switched (as shown in FIG. 3). (State) When the fade-out information is detected, a tape running stop signal is sent from the sequence circuit 13 to stop the progress of the tape and enter the recording pause state. Conversely, when switching from a commercial to a broadcast program, the dark video gradually becomes brighter (hereinafter referred to as fade-in information) and switches to a broadcast program. At this time, the blanking information processing circuit 5i detects the fade-in information and outputs "H", for example. As a result, the paused state is released and the recording operation is restarted. Other operations are similar to those of the embodiment shown in FIGS.

Example 3. FIG. 5 is a block diagram showing another example of the blanking information processing circuit used in the character multiplex television signal recording / reproducing apparatus in the third embodiment. In the figure, 23 to 26 are shown in FIG. Since it is the same as the embodiment described above, the same reference numerals are given to corresponding portions, and detailed description thereof will be omitted. In FIG. 5, reference numeral 28 is a band pass filter (hereinafter referred to as BPF (2)), which takes out the audio band of the signal input from the SIF 5d of the channel receiving circuit 5 and supplies it to the mute detection circuit 29. The mute detection circuit 29 detects the presence / absence of an audio signal, and outputs it to the monotonous increase / decrease detection circuit (2) 30. In the monotonous increase / decrease detection circuit (2) 30, if the difference value of the video signal input from the difference circuit 26 monotonously decreases, the black level continues for 2 frames or more, and there is no audio signal, it is determined as fade-out information, and for example, Output "L". If the difference value of the video signal is black level for 2 frames or more and there is no sound, and the difference value of the video signal increases monotonically thereafter, it is determined to be the fade-in information and, for example, "H" is output.

Next, the operation of the VTR having the blanking information processing circuit having the above configuration will be described. In the television signal, the difference in the brightness level of the video signal is sequentially taken for each frame, and the difference is monitored by the monotonous increase / decrease detection circuit (2) 30, and the change is a monotonous decrease and the black level continues for two or more frames. If there is no audio signal, it is determined to be fade-out information, the tape running stop signal is sent, the tape advance is stopped, and the recording pause state is set. If a black level image without an audio signal continues for two frames or more and the change in the difference between the image signals is monotonically increasing, it is determined to be fade-in information and the recording pause state is canceled. Other operations are similar to those of the embodiment shown in FIGS. As described above, only the character multiplex broadcast using the blanking information and the audio signal as the discrimination information is recorded in one cassette tape, and no commercial or the like is inserted therein, so avoid wasteful consumption of the tape. You can

[0029]

As described above, according to the present invention, the character-multiplexed television signal is automatically discriminated within the recording set time, and the recording operation is automatically controlled based on the discrimination information. Therefore, even if the user of the device does not manually operate while monitoring the contents of the broadcast program at all times, and even in the case of unattended reserved recording, recording without the commercial part outside the broadcast contents is continuously performed. be able to. Of course, even if the commercial and the broadcast program have the same audio mode, the commercial part can be removed as long as the broadcast program is the character multiplex broadcast and the commercial is not the character multiplex broadcast.

Further, since the blanking information of the video signal and the mute information of the audio signal are used for the on / off control of the recording operation, more accurate on / off control of the recording operation is possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a character reproducing television signal recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a character multiplex signal processing circuit according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a character multiplex television signal recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing an example of a blanking information processing circuit according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing an example of a blanking information processing circuit according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a conventional technique.

FIG. 7 is a diagram showing a multiplexing position of a character multiplex television signal.

FIG. 8 is a schematic explanatory diagram of a character multiplex television signal.

[Explanation of symbols]

 1a Clock circuit 1b Digital comparator 1c Channel program circuit 1e Setting key 1f Memory circuit 1g TV signal character multiplex mode designating circuit 2 Cassette switch 3 Reserve switch 4 AND gate 5 Channel receiving circuit 5a Tuner section 5b VIF 5c Video detection circuit 5d SIF 5e Voice Multiplex signal processing circuit 5f Voice detection circuit 5h Character multiplex signal processing circuit 5i Blanking information processing circuit 6 Signal recording circuit 7 Video signal output circuit 8 Mixing circuit 9 Rotating magnetic head 10 Analog switch 11 Signal reproducing circuit 12 OR gate 13 Sequence circuit 14 Sync separation circuit 15 Vertical sync separation circuit 16 H. COUNT 17 field determination circuit 18 BPF (1) 19 AND gate 20 detection circuit 21 AND gate 23 1 frame delay circuit 24 video average value processing circuit (1) 25 video average value processing circuit (2) 26 differential circuit 27 monotonous increase / decrease detection Circuit (1) 28 BPF (2) 29 Mute detection circuit 30 Monotonous increase / decrease detection circuit (2)

Claims (4)

[Claims] 1. A recording / reproducing method for receiving a character-multiplexed television signal and recording / reproducing the video signal and audio signal thereof, it is discriminated whether or not the received signal is a character-multiplexed television signal, and the discriminating information indicates the recording operation. A method for recording / reproducing a character-multiplexed television signal, which is characterized by performing on / off control. 2. A signal recording circuit for continuously recording a video signal and an audio signal on a recording medium in a device for receiving a character multiplex television signal and recording and reproducing the video signal and the audio signal, and a recording time It is provided with a timer means for setting, a character multiplex signal processing circuit for determining whether a received signal within the timer setting time is a character multiplex television signal, and a means for controlling ON / OFF of the recording operation by the output of this circuit. A recording / reproducing apparatus for a character-multiplexed television signal. 3. A blanking information processing circuit for discriminating video blanking information between a broadcast program and a commercial is added, and the recording operation is turned on and off by the output of this circuit and the output of the character multiplex signal processing circuit. The character-multiplexed television signal recording / reproducing apparatus according to claim 2, wherein the control is performed. 4. A mute detection circuit for discriminating mute information from an audio signal is added, and on / off control of a recording operation is performed by video blanking information, audio mute information, and output of a character multiplex signal processing circuit. The character multiplex television signal recording / reproducing apparatus according to claim 3, wherein