JP2625026B2 - Recording / reproducing apparatus for audio multiplex television signal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention can receive a domestic television broadcast, record the received content for a predetermined time, and reproduce the recorded content when necessary. Was made possible,
For example, video tape recorders (hereinafter, referred to as VTRs) and digital analog tape decks (hereinafter, referred to as DATs)
It relates to the recording and playback device of audio multiplex television signals such as, especially when the broadcast start time is delayed for some reason or when the news is interrupted in the middle of a broadcast program, and furthermore, as in private broadcasts, The present invention relates to a technique for recording the contents of a program in which commercials are fragmentarily inserted into a broadcast program while removing portions other than the predetermined broadcast.

[Prior Art] FIG. 8 is a block diagram showing an example of a conventional VTR.
In the figure, (1a) is a clock circuit for measuring the current time, and its output is a digital comparator (1
b) is applied to one input terminal. (1c) is a channel program circuit for storing a recording start time, a recording end time, a recording reception channel and the like for reserved recording, and its output is given to the other input terminal of the digital comparator (1b). The user can set the storage contents of this channel program circuit (1c) by using the setting keys (1
This is done by operating d).

(1e) is a memory circuit for storing the reserved recording mode, to which the output of the digital comparator (1b) is applied. This memory circuit (1e) is constituted by, for example, a flip-flop, and its output is a 3-input AND gate. (4) is supplied to the first input terminal. A cassette switch (2) and a reserve switch (3) are interposed between the second input terminal of the AND gate (4) and the power supply and between the third input terminal and the power supply, respectively.

The cassette switch (2) is for detecting whether or not a cassette tape is mounted, and is normally opened (off).
It is closed (ON) when the cassette tape is mounted.
Is done. The 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 a channel receiving circuit (5), a signal recording circuit (6), and a video signal output circuit (7).
And a mixing circuit (8).

The channel receiving circuit (5) includes a tuner section (5a),
Video intermediate frequency amplifier (hereinafter referred to as VIF) (5b),
Audio intermediate frequency amplification circuit (hereinafter referred to as SIF) (5d),
It consists of a video detection circuit (5c) and an audio detection circuit (5e), selects a predetermined channel signal from the TV signals received from the antenna, outputs the video signal from the video detection circuit (5c), Signal detection circuit (5e)
Output more. Each output of the channel receiving circuit (5) is supplied to a rotating magnetic head (9) via a signal recording circuit (6).

(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) is used in the recording mode, and the output of the signal reproducing circuit (11) is used in the reproducing mode. The signal is switched to be applied to the signal output circuit (7). The output of the video signal output circuit (7) is supplied to one input terminal of the mixing circuit (8), and the output of the mixing circuit (8) is supplied to a display device such as a color television receiver.

The output of the AND gate (4) is further supplied to a sequence circuit (14) via an OR gate (13). The sequence circuit (14) outputs the output signal of the AND gate (4) and the mode in advance. The operation of the rotating magnetic head (9) and its driving mechanism (not shown) and the operation of the signal recording circuit (6) and the signal reproducing circuit (11) are controlled in accordance with a command from a designated microcomputer (not shown). I do.

 Next, the operation of the above configuration will be described.

The current time measured by the clock circuit (1a) and the output of the channel program circuit (1c) set by the setting key (1d) are constantly compared by the digital comparator (1b).

When the digital comparator (1b) detects a match between the recording start time from the channel program circuit (1c) and the current time from the clock circuit (1a), the match detection output of the digital comparator (1b) is stored in the memory. The state is sent to the circuit (1e), and the state of the memory circuit (1e) becomes, for example, "H". When the recording end time matches the current time, the state of the memory circuit (1e) is inverted by the output of the digital comparator (1b), and becomes, for example, "L".

Now, when a cassette tape for recording is inserted and the cassette switch (2) is turned on, and the user turns on the reserve switch (3) for reservation recording, the above-mentioned "H" of the memory circuit (1e) is set. During the “period, that is, during the period from the recording start time to the recording end time, the output of the AND gate (4) 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 (14) are operated.

That is, a broadcast signal of a predetermined channel is received by the channel receiving circuit (5), amplified, and detected.
The output signal of the channel receiving circuit (5) is supplied to the video signal output circuit (7) via the analog switch (10).

The output of the video signal output circuit (7) is supplied to a 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 supplied to a signal recording circuit (6) and FM-modulated. The output of the signal recording circuit (6) is applied to a rotating magnetic head (9) and recorded on a magnetic tape. At this time, the sequence circuit (14)
Is operating, and the operation of the rotating magnetic head (9) and the driving mechanism associated therewith are controlled.

[Problems to be Solved by the Invention] Since the conventional recording / reproducing apparatus for an audio multiplex television signal such as a VTR is configured as described above, the contents other than a predetermined broadcast such as a temporary news or a commercial insertion unit may be determined based on the contents of a broadcast program. Since the on / off control of the recording operation required to remove the content relied on manual operation, the user of the device such as a VTR must constantly monitor the content of the broadcast program, and the specified broadcast content In addition, it is difficult to accurately record only the information, and there is an inconvenience that such recording requires a large number of operation steps.

In addition, when a broadcast program is scheduled to be recorded, the program content cannot be monitored, so that it is not possible to substantially perform recording while removing portions other than predetermined broadcast content such as a commercial insertion unit. Therefore, for example, in the case of a commercial broadcast with commercials inserted,
When pre-recording a 120-minute broadcast program, approximately 20% of the commercial insertion time inserted in the broadcast program must be added, and the use of a 140-minute tape is required. As a result, there is a problem that the recording must be performed in the double speed mode, although the recording can be normally performed at the standard speed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to accurately remove only a predetermined broadcast content by removing portions other than the predetermined broadcast content without constantly monitoring the content of the broadcast program. It is an object of the present invention to provide a recording / reproducing apparatus for an audio multiplex television signal which can be recorded on a television.

[Means for Solving the Problems] A recording / reproducing apparatus according to claim 1 of the present invention comprises: signal recording means (signal recording circuit 6, sequence circuit 14, head 9, etc.) for recording a television signal on a recording medium; Scheduled recording information setting means (setting key 1d and channel program circuit 1c) for setting the scheduled recording information such as the time to start and end the recording operation by the signal recording means, the recording and receiving channel, and the scheduled recording start time While starting the recording operation by the signal recording means, the audio mode of the television broadcast is determined during a predetermined time from the reserved recording start time, and within the preset recording set time after the predetermined time has passed. Permits the recording operation by the signal recording means only when the audio mode of the television broadcast matches the audio mode determined above. And control means for performing the control.

According to a second aspect of the present invention, as the control means of the first aspect, the audio mode of the television broadcast is a bilingual audio mode or a stereophonic audio mode during a predetermined time from the reserved recording start time. The television broadcast in any of the bilingual audio mode, the stereo audio mode, and the monaural audio mode is transmitted after the above-described predetermined time based on the plurality of determination results. It is determined whether or not to be the target of the scheduled recording within the set time for the subsequent scheduled recording, and within the set time for the scheduled recording after the predetermined time, when the audio mode of the television broadcast matches the determined audio mode. Only the microcomputer 21 that permits the recording operation by the signal recording means is provided.

[Operation] In the first aspect, the control unit determines the audio mode of the television broadcast to be the target of the scheduled recording during a predetermined time from the scheduled recording start time.

Further, the microcomputer according to claim 2 repeatedly determines whether the audio mode of the television broadcast is the bilingual audio mode or the stereo audio mode until a predetermined time has elapsed from the scheduled recording start time. Then, based on the plurality of determination results, the audio mode of the television broadcast to be reserved for recording is determined.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing an embodiment of the present invention with reference to the drawings, an outline of audio multiplex broadcasting will be described below.

Audio multiplex broadcasting system (1) Dual audio multiplex broadcasting Double audio multiplex broadcasting is a TV broadcasting system that sends not only Japanese but also the original language (foreign language) at the same time.
As shown in Fig. 6 (a), the transmission and reception systems use Japanese and foreign languages as main and sub audio signals, respectively, as the main and sub audio signals of the transmitter.
It is sent to the sub-channel circuit, converted into one radio wave and broadcast.

Therefore, the receiver receives this radio wave and separates and extracts the main audio signal and the sub audio signal.

The main sound and the sub sound can be freely switched by the selection of the receiver. A receiver without a multiplexing device is designed to be able to receive only the main channel and has compatibility.

(2) Stereo audio multiplex broadcasting This is a TV broadcasting system that transmits audio stereophonically, instead of transmitting audio monophonically.
In the receiving system, as shown in FIG. 6B, the left signal and the right signal are passed through a matrix circuit to generate sum and difference signals (L + R) and (LR). These (L + R),
The (LR) signals are sent to the main and sub-channel circuits of the transmitter, respectively, and processed and sent out in the same manner as the double sound.

In the receiver, the (L + R) and (LR) signals are separately extracted, and a left signal and a right signal are generated through a matrix circuit. In a receiver without a multiplexing device, when receiving stereo transmission, (L + R) of the main channel
It is designed to be able to receive only signals and is compatible.

Voice multiplex signal The frequency spectrum and frequency shift of the voice multiplex signal are the seventh.
As shown in the figure, each signal will be described below.

(1) Main channel signal The main channel signal is the same audio signal as the conventional one, and its frequency band is 0 to 15 kHz, and the maximum frequency shift of the main carrier is ± 25 kHz.

(2) Sub-channel signal The sub-channel signal is FM-modulated using the sub-carrier. As the audio subcarrier, 31.5 kHz, which is twice the horizontal scanning frequency, is selected. Thus, the reason for choosing 31.5 kHz, twice the horizontal scanning frequency, as the audio subcarrier is
This is to reduce buzz interference that occurs in an inter-carrier type TV and to increase the bandwidth of the sub-audio. The frequency band of the sub-channel is 0 to 15 kHz as in the main channel, and the maximum frequency shift of the main carrier is 15 kHz for two voices and 20 kHz for stereo.

(3) Multiplex control signal Although the double sound and the stereo broadcast are different systems, if attention is paid to the receiver, a common circuit configuration can be adopted except for the matrix circuit. A multiplex control signal is added in order to make the receiver automatically distinguish between a double sound and a stereo signal and switch circuits.

The multiplex control signal is 55.125k, 3.5 times the horizontal scanning frequency.
Hz control signal subcarrier, 922.5H for double voice
AM modulated with z sine wave.

The frequency of the control signal subcarrier is selected to be 3.5 times the horizontal scanning frequency in order to eliminate the effects of vehicle noise and buzz interference and to ensure control even in weak electric fields.

The above main channel signal, sub channel signal,
When the multiplexed signal combined with the multiplexed control signal is FM-modulated by the main carrier, it becomes a radio wave of voice multiplexing. This method is called FM-FM method.

FIG. 1 is a block diagram showing an example of a VTR according to an embodiment of the present invention, wherein (1a) to (1e),
(2) to (5), (5a) to (5d), (6) to (11),
Since (13) and (14) are the same as the conventional example shown in FIG. 8, the same reference numerals are given to the corresponding parts and their detailed description is omitted.

In FIG. 1, (5f) is an audio multiplex signal processing circuit, that is, a multiplex demodulation circuit. This multiplex demodulation circuit (5f)
Is a 16-47 kHz band-pass filter (hereinafter B) from the audio multiplex signal taken out of the SIF (5d) of the channel receiving circuit (5).
Sub-channel signal and 55.1 kHz by (53)
Extract the control channel signal of z, and then separate it.

The sub-channel signal is FM-detected by a sub-carrier FM detection circuit (51), and an original sub-audio signal (LR) is extracted. After that, it is processed together with the main channel signal and output as a double audio signal or a stereo audio signal.

On the other hand, the control channel signal is the control signal AM detector (5
According to 0), a sine wave of 922.5Hz or 982.5Hz is extracted, and each is rectified to create a control voltage. The matrix circuit (54) is automatically switched by this control voltage, and at the same time, the reception display circuits (55), (56),
(57) is turned on.

(52) is a squelch circuit, and this squelch circuit (52)
When the FM detection circuit (51) is operating during monaural broadcasting, unpleasant noise is generated and sound quality is impaired, so that the operation of the circuit is stopped.

(1f) is a TV signal / audio multiplexing mode designation circuit which stores mode designation information and inputs its output to the digital comparator (1b).

 Next, the operation of the above configuration will be described.

Set the recording start time and end time of the specified date and time set by the channel program circuit (1c), and the three modes of the broadcast other than the specified channel, such as dual sound broadcasting, stereo broadcasting or monaural broadcasting, with the setting key (1d) I do. This mode designation information is stored in the TV signal audio multiplexing mode designating circuit (1f), and its output information is always input to the digital comparator (1b).
One of the three modes of the audio signal of the TV signal received from f) is always input to the digital comparator (1b), and the two are compared.

In this state, when the start time for recording is reached, the same operation as in the conventional example of FIG. 8 is performed, and a video signal and an audio signal of a predetermined channel are added to the signal recording circuit (6). If the mode is not the designated mode, a tape running stop signal is sent from another output of the digital comparator (1b), and the tape signal is stopped.

In other words, a so-called recording pause state is entered in which the tape enters the recording state and the progress of the tape stops. Next, when the broadcast delay is released and the audio mode becomes the same as the designated mode,
The pause state is released, the tape runs, and the recording operation is restarted.

If extra news or commercials are inserted during the broadcast of the double audio, another output signal of the digital comparator (1b) is also output to the sequence circuit (1).
In addition to 4), the pause state is resumed during that time, and when the temporary news or commercial ends, the pause state is released and the recording operation is restarted.

As described above, the designated double audio broadcast is recorded on one cassette tape, and no extra news, commercials, etc. are inserted therein, so that wasteful consumption of the tape can be avoided.

FIG. 2 is a schematic diagram of a VTR according to another embodiment of the present invention. In FIG. 2, (5) is a channel receiving circuit, and (5f) is an audio multiplex signal processing circuit. FIG. 7 shows the frequency spectrum and frequency shift of the audio multiplex signal of the John Broadcasting System. These circuits (5) and (5f) have the configuration shown in FIG. 1, and a detailed description thereof will be omitted. The audio of the main channel is output to the terminal (5fa) and the audio of the sub-channel is output to the terminal (5fb) of the audio multiplexed signal processing circuit (5f).

(18) and (19) are LEDs for displaying the reception status in the stereo broadcast mode and bilingual broadcast mode, (15) and (20)
Is a switching transistor corresponding to these LEDs (18) and (19), and outputs the stereo broadcast mode output signal (16) and the bilingual broadcast mode output signal (17) from the audio multiplex signal processing circuit (5f). With the input to the base, switching is performed to turn on the LEDs (18) and (19).

(21) is a microcomputer, which is a voice multiplexed signal processing circuit (5
The output signals (16) and (17) from (f) are input as "H" level in the stereo broadcast mode and bilingual broadcast mode, and are input as "L" level in the monaural broadcast mode. This allows the microcomputer (21)
Monitors the output signals (16) and (17) and determines whether the broadcast mode is stereo, bilingual, or monaural.

The microcomputer (21) also serves as a part of a VTR system control microcomputer, and has a key matrix unit (24) including a recording switch (22) and a reproduction switch (23).

Next, the operation of the configuration of FIG. 2 will be described with reference to the flowcharts of FIGS.
Note that here, the removal function of the commercial
The operation during timer recording will be described so that the user can clearly specify the operation. In the following description, the output signal (16) in the stereo broadcast mode is expressed as ST, and the output signal (17) in the bilingual broadcast mode is expressed as B1.

As shown in FIG. 3, the start of timer recording (step S2
At 0), the registers A, B, and C are cleared (step S21), and each broadcast mode is monitored within 5 minutes from the start of timer recording (step S22).

First, it is determined whether or not ST = H (step S2).
3) In case of ST = H stereo broadcast mode (step S2
4), increment the A register (step S2)
Five). Similarly, it is determined whether or not B1 = H within the above five minutes (step S26). If the bilingual broadcast mode is B1 = H (step S27), the B register is incremented (step S28). In the case of the monaural broadcast mode of B1 モ ー ド H (step S29), the C register is incremented (step S30).

Then, five minutes after the start of recording, the A, B, and C registers are compared (steps S31 to S33), and the A, B, and C registers are cleared (step S34). The register is set to 1, the F register is set to 1 in the monaural broadcast mode, and the E register is set to 1 in the bilingual broadcast mode (steps S35 to S37), and the mode shifts to the timer recording mode (step S38).

Next, as shown in FIG. 4, in the timer recording mode (step S38), the D and E registers are monitored, that is, it is determined whether or not D = 1 (step S39). , D = 1, it is determined that the broadcast mode is the stereo broadcast mode (step S41), and if D ≠ 1, it is determined whether E = 1 (step S40). If E = 1, It is determined that the broadcast mode is the bilingual broadcast mode (step S42),
When E ≠ 1, it is determined that the mode is the monaural broadcast mode (step S43).

In the above-described broadcast mode determination, for example, when it is determined that the broadcast mode is the bilingual broadcast mode (step S42),
It works as follows.

That is, as shown in FIG. 5, it is determined whether or not B1 = “H” (step S44), and B1 ≠ “H”, that is, B1
When it is determined that 1 = “L”, the recording is interrupted (step S48). Then, it is determined again whether or not B1 = “H” (step S49), and if it is determined that B1 = “H”,
The recording is restarted (step S50).

If it is determined in step S44 that B1 = "H", it is determined whether or not the recording end time has come (step S45). When the end time has come, the E register is cleared (step S46). ), The recording is automatically stopped (step S47).

As described above, by monitoring the B1 and ST signals for 5 minutes from the start of recording, the broadcast mode of the program to be recorded is determined, and during recording, the signal of the broadcast mode changes from “H” to “L”. The change point is determined to be the start point of the commercial insertion section, and the recording is interrupted by automatically operating the recording switch (22) by the microcomputer (21).
Is determined as the end point of the commercial insertion section, and the microcomputer (21) automatically operates the reproduction switch (23) to resume recording, thereby removing the commercial insertion section. Can be recorded automatically.

FIG. 5 shows the flow of the on / off control of the recording operation when the broadcast mode is determined to be the bilingual broadcast mode, but the recording when the stereo broadcast mode and the monaural broadcast mode are determined. The flow of the on / off control of the operation is the same as that in FIG.

In the embodiment shown in FIG. 1, the TV signal / audio multiplexing mode designation circuit (1f) is provided, but it may be housed in the microcomputer of the channel program circuit (1c).

Also, the demodulated audio signal shown in FIG. 1 is shown to be applied to the rotating drum (9) via the signal recording circuit (6), but this shows a two-layer recording of the VHS HIFI audio recording. Alternatively, bias recording may be performed on a linear audio track.

Furthermore, the above description shows a case where the present invention is applied to a VTR, but can be widely used for recording devices such as a DAT and a laser disk.

[Effects of the Invention] As described above, according to the present invention, a portion other than the substantial broadcast contents such as extra news and commercials is removed in the reservation recording, so that only the desired substantial broadcast contents are recorded. Therefore, it is possible to reduce the consumption of the recording medium in the reserved recording, and it is possible to continuously watch only the desired broadcast content during reproduction. In particular, when recording a program content in a bilingual broadcast mode such as a movie, the output of the identification signal of the bilingual broadcast is interrupted in the commercial insert unit, and the commercial insert unit enters the stereo broadcast mode or the monaural broadcast mode. It is easy to detect the start point and the end point, and the recording without the commercial insertion part can be performed more accurately.

That is, according to the present invention, the scheduled recording information setting means,
A control means for determining the audio mode of the television broadcast for a predetermined time from the start of the scheduled recording, and after a predetermined time has elapsed, the control means for permitting the recording operation when the determined audio mode matches the audio mode of the television broadcast. With this arrangement, the audio mode of the television broadcast can be automatically determined during a predetermined time from the scheduled recording start time, and the determined audio mode and the audio mode of the television broadcast within the preset recording set time can be changed. Since the recording operation is permitted when they coincide with each other, if a broadcast (commercial etc.) with a different audio mode is performed within the reserved recording time, the recording mode is not permitted because the audio mode with the television broadcast to be reserved is different. Therefore, only the substantial contents (main part) of the program to be scheduled-recorded can be scheduled-recorded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a VTR according to one embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a VTR according to another embodiment of the present invention, and FIGS. FIG. 6 (a) is a flowchart of an operation program having the configuration of FIG.
(B) is a schematic explanatory diagram of audio multiplex broadcasting, FIG. 7 is an explanatory diagram of a frequency spectrum and a frequency shift of an audio multiplex signal, and FIG. 8 is a block diagram showing a configuration of a conventional VTR. (1b) Digital comparator, (1c) Channel program circuit, (1d) Setting key, (1e)
Memory circuit, (5) ... channel receiving circuit, (6) ...
... Signal recording circuit, (11) ... Signal reproduction circuit, (14) ...
Sequence circuit, (21) ... microcomputer. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (2)

(57) [Claims] 1. A signal recording means for recording a television signal on a recording medium, and a reservation recording for setting reservation recording information such as a start time and an end time of a recording operation by the signal recording means and a recording / receiving channel. The information setting means, while starting the recording operation by the signal recording means from the scheduled recording start time, to determine the audio mode of the television broadcast during a predetermined time from the scheduled recording start time, the predetermined time has passed Control means for permitting the recording operation by the signal recording means only when the audio mode of the television broadcast coincides with the determined audio mode within a later set recording time. A multiplex television signal recording / reproducing device. 2. The control means is constituted by a microcomputer, and the microcomputer has a bilingual sound mode for a television broadcast in an audio mode during a predetermined time from the reserved recording start time. And the stereo audio mode are repeatedly determined, and based on the plurality of determination results, the television broadcast in any of the bilingual audio mode, the stereo audio mode, and the monaural audio mode is transmitted to the predetermined mode. It is determined whether or not to be the target of the scheduled recording within the set recording time after the elapse of the time, and within the set recording time after the predetermined time, the audio mode of the television broadcast is the same as the determined audio mode. 3. The recording operation according to claim 2, wherein the recording operation by said signal recording means is permitted only when the two coincide with each other. Recording and reproducing apparatus of the sound multiplex television signal.