JPH052795A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To validly utilize the recording time of a tape, and prevent the lack of the recording due to a tape replacement by using the residual amounts of the tape, and the voice multiplex judging signal of a television program, completing the recording of the first volume tape, and switching it to the recording of the second volume tape. CONSTITUTION:The residual amounts of the tape are calculated by supply and take-up reel stands 1 and 2, sensors 3 and 4, and residual amount calculating circuit 5, and the calculated result is outputted to a comparator circuit 6. A value by which the winding turbulence of the residual amounts of the tape can be prevented in the neighborhoods of the winding end is inputted to the other input of the circuit 6 as a set value 7, and an input signal change detecting circuit 15 outputs a pulse at the change of stereo and duplex voice judging signal 13 and 14. The recording of the first volume tape is automatically switched to that of the second volume tape by a tape switching circuit and mechanism 9 and 10, by using this output and the output of the circuit 6. Thus, the recording time of the tape can be validly utilized, and the lack of the recording due to the tape replacement can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a VTR having an automatic changer function of automatically switching between a plurality of tapes for recording / reproducing.

[0002]

2. Description of the Related Art An autochanger in which a plurality of tapes are stocked in order to expand a limited recording / reproducing time width with one tape, and these tapes are sequentially replaced for recording or reproducing. VT with function
R is known. In such a VTR, when a television program or the like is continuously recorded on a plurality of tapes, the recording by the first tape is generally performed by detecting the end of the winding of the first tape. After that, the method of starting recording on the second tape is adopted.

Further, in the cassette changer for VTR disclosed in Japanese Patent Laid-Open No. 57-15255,
A method is shown in which if one program or program is recorded even if the winding of the first tape is not completed, recording is started from the time when the next program or program is recorded on the second tape. Has been done.

[0004]

However, in the former prior art described above, since recording is continued on the first tape until the winding of the first tape is completed, the winding disorder occurs near the end of the tape. The problem is that the recording becomes unstable due to the large size, and the reproduction of that portion also becomes unstable.
While switching from the second volume to the second volume, there is a drawback that the contents of the recorded program are lacking. Further, the latter prior art described in Japanese Patent Application Laid-Open No. 57-15255 solves the problem that the program contents are missing in the middle, but even if the remaining time of the first tape is sufficient,
When one program ends, the tape of the first roll is not recorded any more, so that there is a drawback that the recording time of the tape cannot be effectively utilized.

The present invention has been made in view of the above points,
The purpose thereof is to effectively utilize the recording time of the tape and to prevent the lack of the recording program content between the end of the recording of the first tape and the start of the recording of the second tape.

[0006]

In order to solve the above-mentioned problems, first of all, attention is paid to the use of a tape remaining amount calculating function which is usually provided in a relatively large number of VTRs. By the end of recording on the first tape, auto-changing the tape and starting recording on the second tape when the value reaches the limit value that does not cause disorder of the winding near the end of winding. , Prevent instability of recording due to disorder of winding.

When a TV program or the like ends and a next program starts, the audio multiplex mode often changes when a music program follows a movie program. If you switch the recording from the first volume to the second volume, the lack of program content is only the first part of the next program, that is, the part where the theme music is playing,
It does not cut into the content of the program and practically has little effect. In addition, commercial broadcasts often enter between programs or in the middle of a program, but since commercial broadcasts are generally unrelated to the content of the program, the time when the commercial is being broadcast is detected, and the tape 1 By switching the recording from the second volume to the second volume, it is possible to prevent the necessary program contents from being lacking. Here, since commercials are often broadcast in stereo, it is detected that the audio multiplex discrimination signal is switched to stereo, or the continuous time of normal commercials is sufficiently shorter than the continuous time of the main part. Then, when the audio multiplex discrimination signal changes, it is judged that the commercial broadcast is made by detecting the change of the audio multiplex discrimination signal after it is determined that the time before the change is obviously longer than the commercial. You can judge. The audio multiplex discrimination signal can be easily detected by many types of VTRs.

Furthermore, although the remaining time of the first tape is larger than the above-mentioned limit value at which the disorder of the winding does not occur, the remaining time of the tape does not have much margin, If the change of the audio multiplex discrimination signal is detected within this remaining time and the recording is switched from the first volume to the second volume, the tape is switched at the break of the program or the commercial period. It is possible to prevent the lack of the tape and to effectively utilize the recording time of the tape.

[0009]

A known tape remaining amount calculation system is a signal from a supply reel sensor which outputs a pulse output proportional to the rotation speed of a supply reel and a signal from a takeup reel sensor which outputs a pulse output proportional to the rotation speed of a takeup reel. Calculate the remaining tape time with. This value is compared with a preset value (for example, 5 minutes), and when the remaining time becomes 5 minutes or less, a signal is output from the comparison circuit, and the tape switching circuit is operated by the output, and the tape switching mechanism is activated. Work to switch the tape from the first to the second. Also, a pulse signal from the input signal change detection circuit composed of a microprocessor or the like which outputs a stereo / double sound discrimination signal by the voice multiple tuner circuit and outputs an output each time the signal changes, and the above signal. And a signal from a timer circuit that is configured to output after being delayed by the maximum commercial length or more from the time when the change occurs in the AND circuit, and the tape switching circuit outputs the output signal of the AND circuit. Is operated to switch the tape from the first roll to the second roll during the commercial.
At this time, if the delay time of the timer circuit is set to 0, the tape is switched from the first volume to the second volume when the audio identification signal changes, that is, when it is determined that the program has been switched.

Further, although it is larger than the tape remaining time (for example, 5 minutes) set to prevent the winding disorder,
A remaining time (for example, 15 minutes) that is not so much margin is set in advance, and the comparison circuit compares this 15 minutes with the current remaining tape time to determine the remaining tape time of 15 minutes. When the minutes are cut, the output signal is sent from the comparison circuit to the AND circuit. The AND circuit receives an input signal every time the audio multiplex discrimination signal of the TV program being recorded is switched, and accordingly, when the audio multiplex discrimination signal is switched after the remaining tape time is less than 15 minutes, AND An output signal is sent from the circuit and is input to the OR circuit. When the remaining tape time is less than 5 minutes, a signal is input to this OR circuit from another comparison circuit. Therefore, the remaining tape time is less than 15 minutes and the remaining tape time is When the audio multiplex discrimination signal is switched before 5 minutes, a signal is output from the OR circuit, whereby the tape switching circuit is operated and the tape is switched from the first to the second. That is, when the program moves to the next program or enters the commercial when the remaining amount of time, which cannot be said to have a sufficient margin, is entered, the tape is switched from the first volume to the second volume.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 is a block diagram of a VTR having an autochanger function according to a first embodiment of the present invention. In FIG. 1, 1 is a supply reel stand, 2 is a take-up reel stand, 3 is a supply reel sensor, 4 is a take-up reel sensor, 5 is a remaining amount calculation circuit, 6 is a comparison circuit, 7 is an input set value, 8 is OR circuit, 9 tape switching circuit, 10 tape switching mechanism, 11 antenna, 1
2 is a voice multiplex tuner, 13 is a voice multiplex discrimination signal (stereo), 14 is a voice multiplex discrimination signal (double voice), 15 is an input signal change detection circuit, 16 is a timer circuit, 17 is a reset input terminal, 18 is an AND In the present embodiment, the components 5, 6, 8, 9, 15, 16, 17, etc., which are circuits, are actually constructed by the microprocessor 19. Although not shown in the present embodiment, at least two or more tapes (tape cassettes) can be accommodated in the apparatus main body at the same time, and the tape switching circuit 9
The tape switching mechanism 10 exchanges the tapes so that the recording of the second tape is automatically started after the recording of the first tape is completed.

In the above structure, assuming that the first tape is being recorded, the supply reel sensor 3 outputs a number of pulses proportional to the number of rotations of the supply reel when the tape is running. The take-up reel sensor 4 outputs a number of pulses in proportion to the number of revolutions of the, and the remaining time calculation result by the outputs of these two sensors is output from the remaining amount calculation circuit 5 and sent to one input end of the comparison circuit 6. To be done. In addition, the comparison circuit 6
At the other input end, the value of the limit that the remaining tape amount does not cause winding disorder near the end of the winding is entered as the input set value 7, and the remaining time calculation result by the sensor output is this preset value. When it becomes smaller, the comparison circuit 6 sends the output to the OR circuit 8. Then, the output of the comparison circuit 6 is output to the switching circuit 9 via the OR circuit 8 as a signal indicating the timing of switching the tape from the first winding to the second winding, and as a result, the switching circuit 9 outputs the drive control signal. It is sent to the tape switching mechanism 10, and the tape switching mechanism 10
Operates to switch the tape from the first to the second and continue recording. Here, for example, if winding disorder occurs 5 minutes before the end of the winding of the tape, setting the input set value 7 to a value corresponding to 5 minutes will cause the disorder of winding of the first tape to start. You can switch to the second tape.

A television program received by the audio multiple tuner 12 via the antenna 11 is recorded on a tape by a recording system signal processing circuit (not shown), and at the same time, a stereo discrimination signal 13 and two signals output from the audio multiple tuner 12 are output. The heavy voice discrimination signal 14 is input to the input signal change detection circuit 15 which outputs a pulse output only when its input changes. The pulse output of the input signal change detection circuit 15 is A
It is input to one input terminal of the ND circuit 18 and also to the reset terminal 17 of the timer circuit 16. Here, the timer circuit 16 drops its output when an input is input to the reset terminal 17, resets the count once, then starts counting, and after a preset time elapses,
The output of the timer circuit 16 is input to the other input terminal of the AND circuit 18.
Since the output of the AND circuit 18 is input to the above-mentioned OR circuit 8, the tape recording is switched from the first volume to the second volume when the output from the AND circuit 18 is output. Therefore,
For example, if the commercial time is 5 minutes or less at the maximum even if it is continuous, setting the timer circuit 16 to 5 minutes changes the voice multiplex discrimination signal and the input signal change detection circuit 15 outputs a pulse output. In this case, the output of the AND circuit 18 is output only when the immediately preceding audio multiplex discrimination signal has not changed for more than 5 minutes (only when it can be determined that the previous mode is not commercial), so the commercial is just broadcasted. While the tape is in the middle, the tape can be switched from the first roll to the second roll for recording. If the set time of the timer circuit 16 is set to 0 minutes, the tape replacement operation can be started at the moment when the audio multiplex mode is changed.

FIG. 2 is a block diagram of a VTR having an autochanger function according to a second embodiment of the present invention.
In the figure, the same configurations and signals as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted to avoid duplication. Figure 2
In the figure, reference numeral 20 denotes a comparison circuit, and the output of the remaining amount calculation circuit 5 (tape remaining time calculation result output) is also input to one input terminal of the comparison circuit 20. At the other input terminal of the comparison circuit 20, the remaining time (for example, 15 minutes) which is larger than the input setting value 7 (for example, 5 minutes) to the comparison circuit 6 but is not so marginal. Minute) is entered as the input set value 21, and when the remaining tape time is less than this input set value, that is, in the present embodiment, less than 15 minutes, the comparison circuit 20 outputs. Two
Reference numeral 2 denotes an AND circuit whose output end is connected to one input end of the OR circuit 8 described above. The output from the comparison circuit 20 is input to one input end of the AND circuit 22 and the other end of the AND circuit 22 is input. The output of the input signal change detection circuit 15 is directly input to the input end.

In the present embodiment having the above-mentioned configuration, when the remaining tape time of the first roll falls below 15 minutes, the output of the comparison circuit 20 rises and is input to one input terminal of the AND circuit 22. In this state, if the audio multiplex discrimination signal is switched before the remaining tape time is less than 5 minutes, the output of the input signal change detection circuit 15 is input to the other input terminal of the AND circuit 22. The output of 22 is sent to the tape switching circuit 9 via the OR circuit 8 as a tape exchange command signal, whereby the tape switching mechanism 1
0 operates to switch the tapes from the first to the second and continue recording. Therefore, when the program moves to the next program or enters the commercial when the remaining amount of time is not enough, the tape will switch from the first volume to the second volume. Can be prevented, and the recording time of the tape can be effectively used. The remaining tape time is 1
After 5 minutes, if the audio multiplex discrimination signal does not switch before the tape remaining time falls below 5 minutes, the output of the comparison circuit 6 is output at the timing when the tape remaining time falls below 5 minutes. The tape rises and is input to the OR circuit 8, and the tape is switched from the first roll to the second roll.

FIG. 3 is a block diagram of a VTR having an autochanger function according to a third embodiment of the present invention.
In the figure, the same configurations and signals as those in FIGS. 1 and 2 are designated by the same reference numerals. The difference between the present embodiment and the second embodiment is that one input to the AND circuit 22 receives the output of the timer circuit 17 and the output of the input signal change detection circuit 15 as in the first embodiment. The output terminal of the AND circuit 18 for ANDing and outputting is connected. In this embodiment having such a configuration, after the tape remaining time is less than 15 minutes and before the tape remaining time is less than 5 minutes, the broadcast is started from the first tape at the timing when the broadcast enters the commercial. It is possible to switch to the second volume and record.

[0017]

As described above, according to the present invention, at least two tapes can be continuously recorded by combining the simple method of utilizing the remaining amount of tape and the audio multiplex discrimination signal of the television program. It is possible to effectively use the recording time of the tape and to prevent the lack of the recording program contents between the first and second tape replacement.

[Brief description of drawings]

FIG. 1 is a block diagram of a VTR having an autochanger function according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a VTR having an autochanger function according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a VTR having an autochanger function according to a third embodiment of the present invention.

[Explanation of symbols]

1 supply reel stand 2 Take-up reel stand 3 Supply reel sensor 4 Take-up reel sensor 5 Remaining amount calculation circuit 6 comparison circuit 7 Input setting value 8 OR circuit 9 Tape switching circuit 10 Tape switching mechanism 11 antenna 12 audio multiple tuners 13 Audio multiplex discrimination signal (stereo) 14 Voice multiplex discrimination signal (double voice) 15 Input signal change detection circuit 16 timer circuit 17 Reset input terminal 18 AND circuit 19 microprocessors 20 Comparison circuit 21 Input setting value 22 AND circuit

Claims (5)

[Claims] 1. At least two tapes are used, and one tape is used.
In the magnetic recording / reproducing apparatus having the auto changer function, which is capable of automatically starting the recording on the second tape after the recording on the first tape is completed, the remaining amount of the first tape is predetermined. When it is shorter than the time
A magnetic recording / reproducing apparatus comprising means for ending recording on the first tape and switching to recording on the second tape. 2. Use of at least two rolls of tape, and
In the magnetic recording / reproducing apparatus equipped with the auto changer function, which can automatically start the recording of the second tape after the recording of the second tape is completed, the audio multiplex discrimination signal of the TV program being recorded is A magnetic recording / reproducing apparatus comprising means for ending recording on the first tape and switching to recording on the second tape when the state changes from one state to another. 3. The method according to claim 2, wherein when the audio multiplex discrimination signal of the television program being recorded changes after being kept in the same state for a predetermined time or more, the recording of the first tape is terminated. A magnetic recording / reproducing apparatus characterized in that the recording is switched to recording on the tape of the first roll. 4. Use of at least two rolls of tape, and
In the magnetic recording / reproducing apparatus having the auto changer function, which is capable of automatically starting the recording on the second tape after the recording on the first tape is completed, the remaining amount of the first tape is predetermined. When it becomes shorter than the first predetermined remaining time, or the remaining amount of the first tape is larger than the first predetermined remaining time within a predetermined second predetermined remaining time. A means for ending recording of the first tape and switching to recording on the second tape when the audio multiplex discrimination signal of the television program being recorded and changed to another audio multiplex discrimination signal And a magnetic recording / reproducing apparatus. 5. The method according to claim 4, wherein the audio multiplex discrimination signal of the television program being recorded has changed within the second predetermined remaining time after being kept in the same state for a predetermined time or more. Sometimes the recording of the first tape is ended and 2
A magnetic recording / reproducing apparatus characterized in that the recording is switched to recording on the tape of the first roll.