JPH10283694A - Magnetic recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record a video and an audio before/after a CM without omission. SOLUTION: At the time of the recording operation mode of a program, a system controller 8 stops temporarily recording operation based on a discrimination result from a mode discrimination circuit 7 when the program while broadcasting is switched from a monaural broadcast to a stereo broadcast, and starts measurement for a fixed time (time slightly shorter than a commercial broadcast time) by a timer circuit 11. Then, when the measurement for the fixed time is, ended, the controller 8 releases the temporal stop to make restart the recording operation, and discriminates the broadcast mode by the mode discrimination circuit 7, and continues the recording operation as it is when its discrimination result is switched to the monaural broadcast, and stops temporarily the recording operation after unwinding for prescribed time when the result is the stereo broadcast as it is, and starts to measure the fixed time by the timer circuit 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a magnetic recording apparatus, and more particularly, to a magnetic recording apparatus that prevents loss of images and sounds at a joint of recording screens due to CM cut.

[0002]

2. Description of the Related Art A conventional video cassette recorder (VC)
The CM cut recording device mounted on R) usually uses the fact that a program is broadcasted in monaural and a commercial (CM) is broadcasted in stereo to change from monaural to stereo and from stereo to monaural. Is detected, only whether the program is a program or a commercial is determined, and the commercial is cut.

[0003] That is, it is determined whether the broadcast being recorded is a stereo broadcast or a monaural broadcast. When the broadcast is switched from monaural to stereo, the recording operation is set to the pause mode, and when the broadcast is switched from stereo to monaural, the recording is temporarily stopped. The stop mode is released and the recording operation is continued.

[0004]

However, in such a CM cutting method, it takes a little time to detect a change from stereo to monaural, and a little time to mechanically release the pause state. And because
There was a slight time lag between the timing of returning to the program from the CM and the timing of actually starting the recording operation, and there was a problem that a broadcast image and audio immediately after returning to the program could not be recorded.

[0005] The lack of the broadcast image and the sound immediately after returning to the program, even for a short time, is uncomfortable for a viewer of the program. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a magnetic recording apparatus capable of recording an image and a sound before and after a CM without losing the image and sound.

[0006]

In order to solve the above-mentioned problems, a magnetic recording apparatus according to the present invention comprises a discriminating means for discriminating a broadcast mode of a program being broadcast, and a fixed time slightly shorter than a commercial broadcast time for a predetermined unit. And a recording operation control means for controlling a recording operation. In a recording operation mode of the program, the recording operation control means sets a broadcast mode of a program being broadcast based on a result of the discrimination by the discrimination means. When is switched, the recording operation is paused, the measurement for a certain time is started by the measuring means, and when the measurement for the certain time is finished, the recording operation is restarted, and the broadcast mode is determined by the determining means. If the determination result is switched to the original broadcast mode, the recording operation is continued, and if the determination result is still the switched broadcast mode, the recording operation is continued. After stopping the recording operation rewind a predetermined time, stops the recording operation temporarily is to start measuring a predetermined time by said measuring means.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an electrical configuration of a VCR which is a magnetic recording device of the present invention.

An antenna input terminal 1 is connected to a tuner circuit 2 for selecting a desired channel from a received broadcast wave, and an output of the tuner circuit 2 is connected to an audio signal processing circuit 3 and a video signal processing circuit 4. Have been. The audio signal processing circuit 3 is connected bidirectionally to an audio recording / reproducing head 5 for recording an audio signal on the magnetic tape T and reproducing the recorded audio signal. Video recording / reproducing heads 6 and 6 for recording a video signal on the tape T and reproducing the recorded video signal are bidirectionally connected.

The output of the audio signal processing circuit 3 is connected to a mode discriminating circuit 7 for discriminating a broadcast mode such as whether the broadcast of the receiving channel is a stereo broadcast or a monaural broadcast. The output is connected to the system controller 8.

The system controller 8 controls the operation of the whole VCR. The system controller 8 controls the servo circuit 8 to control the running of the magnetic tape T, and also controls the audio signal processing circuit 3 and the video signal processing circuit 4 respectively. A control signal is output to control a recording operation and a reproducing operation of an audio signal and a video signal. Further, an output of a key input unit 10 including various switches such as a power switch and a switch for setting a CM cut recording operation mode is led to the system controller 8.
Are bidirectionally connected.

The timer circuit 11 measures a fixed time slightly shorter than a commercial broadcast time for a predetermined unit. Here, the commercial broadcast time is usually 15
Seconds are set as one unit, and a commercial of, for example, two units (30 seconds) is also produced. Therefore, in the present embodiment, the fixed time measured by the timer circuit 11 is set to, for example, 14.5 seconds, which is slightly shorter than the commercial broadcast time for one unit.

Further, once started by the system controller 8, the timer circuit 11 operates as long as no operation stop signal is input from the system controller 8 thereafter.
Each time the measurement for a fixed time is completed, an end signal is output to the system controller 8, and 0.5 seconds later, the measurement for the fixed time is performed again. That is, the end signal is continuously output to the system controller 8 at a cycle of 15 seconds which is a commercial broadcasting time for one unit.

The system controller 8 includes a key input unit 1
When the key input of the CM cut recording operation mode is performed from 0, the CM according to the present invention is based on the monaural or stereo discrimination result input from the mode discrimination circuit 7 and the measurement result of the fixed time by the timer circuit 11. Execute the cut recording operation mode. That is, the system controller 8 implements the recording operation control means according to the first aspect.

Next, the operation of the VCR having the above configuration will be described.
This will be described with reference to the flowchart shown in FIG. When the key input of the CM cut recording operation mode is performed from the key input unit 10, the system controller 8 controls the audio signal processing circuit 3, the video signal processing circuit 4, and the servo circuit 9 to the recording operation mode (step S1). .

That is, the audio signal of the television signal of the desired channel selected by the tuner circuit 2 is subjected to signal processing corresponding to stereo or monaural in the audio signal processing circuit 3 and output to the audio recording / reproducing head 5. Then, the data is recorded on the magnetic tape T running at a constant speed by the servo circuit 9. The video signal of the television signal of the desired channel selected by the tuner circuit 2 is subjected to signal processing (signal processing such as separation of a luminance signal and a color signal and low-frequency conversion of a color signal) in a video signal processing circuit 4. ) Is performed and output to the video recording / reproducing heads 6 and 6,
The data is recorded on the magnetic tape T running at a constant speed by the servo circuit 9.

During the recording operation of such a program, the mode discriminating circuit 7 discriminates whether the broadcast program selected by the tuner circuit 2 is a stereo broadcast or a monaural broadcast, and outputs the discrimination signal. Output to the system controller 8. The system controller 8
The subsequent recording operation mode is controlled based on the determination signal from the mode determination circuit 7.

That is, when the system controller 8 detects that the broadcast has been switched from monaural to stereo based on the determination signal from the mode determination circuit 7, it determines that the broadcast has been switched from the program to the CM, and the audio signal processing circuit 3
In addition, the signal processing in the video signal processing circuit 4 is temporarily stopped, and the running of the magnetic tape T by the servo circuit 9 is temporarily stopped. That is, the recording operation is set to the pause mode (steps S2 and S3).

At the same time, the system controller 8 activates the timer circuit 11, and the timer circuit 11
The measurement for a certain period of time (14.5 seconds in this example) is started (step S4). The timer circuit 11 outputs an end signal to the system controller 8 after finishing the measurement for a certain time. The system controller 8 releases the pause mode of the recording operation based on the end signal (steps S5 and S6). That is, while the signal processing in the audio signal processing circuit 3 and the video signal processing circuit 4 is restarted,
The running of the magnetic tape T by the servo circuit 9 is restarted,
Restart the recording operation.

Further, based on the end signal from the timer circuit 11, the system controller 8
It is determined whether or not the broadcast has been switched from stereo to monaural based on the determination signal from (step S7). If the result of the determination indicates that the broadcast has been switched to monaural broadcasting, it is determined that the program has returned from the CM, and the recording operation is continued as it is (step S8). That is, CM
Since the recording operation has already been performed when returning to the program from, the conventional problem that the broadcast image and the sound immediately after returning to the program cannot be recorded does not occur. If it is determined that the broadcast has been switched to the monaural broadcast, the system controller 8 outputs an operation stop signal to the timer circuit 11 to stop the measurement operation of the timer circuit 11 (step S9).

On the other hand, if the result of the determination in step S7 is that the broadcast is still a stereo broadcast, it is determined that a commercial is still being played, and the resumed recording operation is immediately stopped (step S10), and the recording operation is performed. Magnetic tape T
Is performed (step S11), the recording operation is again set to the temporary stop mode (step S12). In this case, as described above, the timer circuit 11 has already started measuring the next fixed time. Therefore, as long as the CM continues, steps S5, S6, S7 to steps S10, S1
The operations of S1 and S12 are repeated, and the recording operation is temporarily stopped until the end of the CM broadcast.

As described above, the magnetic recording apparatus of the present invention
As the M-cut timing (particularly, the timing of returning from the CM to the program), the broadcast time of the CM is measured in advance without depending on only the change of the audio signal from stereo to monaural. This enables reliable recording without losing images and sounds.

[0022]

The magnetic recording apparatus according to the present invention has a discriminating means for discriminating a broadcast mode of a program being broadcast, a measuring means for measuring a fixed time slightly shorter than a commercial broadcasting time of a predetermined unit, and a recording operation. Recording operation control means for performing the recording operation mode, the recording operation control means suspends the recording operation when the broadcast mode of the program being broadcast is switched based on the determination result of the determination means, and When the measurement unit starts measurement for a certain period of time, and when the measurement for a certain period of time ends, the recording operation is restarted, and the determination unit determines the broadcast mode, and the determination result is switched to the original broadcast mode The recording operation is continued, and if the determination result remains in the switched broadcast mode, the recording operation is stopped, the recording operation is rewound for a predetermined time, and then the recording operation is started. When the program returns from the CM to the program, the recording operation has already been performed, so that the broadcast image and the sound immediately after returning to the program are not recorded. The conventional problem that recording cannot be performed does not occur. That is, CM
By measuring the broadcast time of the CM in advance as the timing of the cut, in particular, the timing of returning from the CM to the program, without depending only on the change of the audio signal from stereo to monaural,
Images and sounds immediately after returning to the program from the CM can be reliably recorded without dropping.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a VCR which is a magnetic recording device of the present invention.

FIG. 2 is a flowchart for explaining the operation of a VCR which is a magnetic recording device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 antenna input terminal 2 tuner circuit 3 audio signal processing circuit 4 audio recording / reproducing head 5 video signal processing circuit 6 video recording / reproducing head 7 mode discriminating circuit 8 system controller 9 servo circuit 10 key input section 11 timer circuit

Claims (1)

[Claims] 1. A system comprising: a determining means for determining a broadcast mode of a program being broadcast; a measuring means for measuring a fixed time slightly shorter than a commercial broadcast time for a predetermined unit; and a recording operation control means for controlling a recording operation. In the recording operation mode of the program, the recording operation control means suspends the recording operation when the broadcast mode of the program being broadcast is switched based on the determination result of the determination means, and stops the recording operation by the measuring means. The measurement of time is started, and when the measurement of the fixed time is completed, the recording operation is restarted, and the broadcast mode is determined by the determination unit. If the determination result is switched to the original broadcast mode, the recording operation is performed. If the result of the determination is that the broadcast mode has been switched, the recording operation is stopped and rewinding is performed for a predetermined time, and then the recording operation is temporarily stopped. A magnetic recording apparatus which stops and starts measurement for a predetermined time by the measuring means.