JPH0664773B2 - Dubbing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention reproduces a tape on which an audio signal or a video signal is already recorded by a master tape recorder and records the reproduced signal on the tape of a slave tape recorder. The present invention relates to a dubbing device that does this.

[Conventional technology]

There is a dubbing device that reproduces a tape from a master tape recorder and records the reproduced signal on the tape of a slave tape recorder.

FIG. 3 is a diagram showing the recording surface of a tape set in such a dubbing apparatus, where T _M is a magnetic tape on the master tape recorder side, and leader tapes L _BM , L at the front and rear ends thereof.
_{The EM} is provided and the signal S _M is recorded.

T _S indicates the magnetic tape on the slave tape recorder side,
Similarly, leader tapes L _BS and L _ES are provided at the front and rear ends thereof.

When dubbing a signal S _M from the magnetic tape T _M as described above, first, each of the tape is attached to the master tape recorder and a slave tape recorder dubbing apparatus, both of the tapes recorder is simultaneously running the tape in the direction of the arrow , The signal S _M reproduced by the magnetic tape T _M is recorded on the magnetic tape T _S to make a duplicate, that is, a copy tape.

By the way, there is the following method as a conventional method for determining that the dubbing is normally performed by the above-mentioned dubbing apparatus.

The first method is to use the leader tapes L _BM and L _EM and the magnetic tape T.
A method of comparing the length l _{M1 of M with} the length l _S1 of the leader tapes L _BS and L _ES and the magnetic tape T _S.

The second method is to detect the leader tapes L _EM and L _ES with a photodetector and measure the length l of the leader tape L _BM and the magnetic tape T _M.
A method of comparing the length l _S2 of _M2 , the leader tape L _BS and the magnetic tape T _S.

[Problems to be solved by the invention]

However, the first method compares the dimensions of l _M1 and L _S1 and determines that the dubbing is complete when l _S1 > l _M1 , and the dubbing is not complete when l _M1 > l _S1. It is judged that there is. Therefore, the leader tapes L _BM , L _EM ,
Depending on the length of L _BS and L _ES , it may be determined that the dubbing is incomplete even if the dubbing is complete, or that the dubbing is incomplete even if the dubbing is incomplete. There is a problem that it is necessary to reproduce the tape to judge whether or not the dubbing is complete.

In addition, the second method has problems that the photodetector is expensive and malfunction may occur when the leader tapes L _EM and L _ES are opaque.

The present invention has been made to solve the above problems, and whether or not dubbing is complete even when the tape length of the slave tape recorder is shorter than the tape length of the master tape recorder. The present invention provides a dubbing device capable of making a determination.

[Means for solving problems]

In the dubbing apparatus of the present invention, the master tape recorder is provided with a reproduction signal detection circuit and a first timer circuit for detecting that the reproduction signal detection circuit does not detect the reproduction signal continuously for a predetermined time, and the slave tape recorder is provided with the tape. An end detection circuit, a second timer circuit for detecting the tape end by the tape end detection circuit, a determination circuit for determining which one of the outputs of the first and second timer circuits is last, and this determination A display means controlled by a circuit is provided.

[Action]

According to the present invention, the master tape recorder is provided with the reproduction signal detection circuit and the first timer circuit, and the slave tape recorder is provided with the tape end detection circuit, the second timer circuit, the determination circuit, and the display means. The determination circuit can determine whether the last output is the first timer circuit or the second timer circuit. Therefore, the display means is controlled according to the determination of the determination circuit, and it is possible to determine whether or not the dubbing is completely performed.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a judgment circuit which can be adopted in the dubbing apparatus of the present invention, and M shows a master tape recorder (hereinafter referred to as a master recorder) portion,
Reference symbol S denotes a slave tape recorder (hereinafter referred to as a slave recorder). 1A to 1D are magnetic heads for reproduction, 2 is a mixing circuit, 3 is a reproduction signal detection circuit for detecting the presence or absence of a reproduction signal, 4 is a first timer circuit, and the reproduction signal detection circuit 3 is for reproducing the reproduction signal. Resets when detected, resets when no playback signal is detected,
When there is no reproduced signal continuously for a predetermined time, for example, 2 seconds, an output signal is sent out.

Also, 5M and 5S are reel base rotation detection circuits, and 6M and 6S.
Is a rectifier circuit that rectifies the current generated in the reel base rotation detection circuits 5M and 5S, and 7M and 7S is the rectifier circuit 6M and
A fall detection circuit for detecting the fall of the current rectified by 6S, 8M and 8S winding the tape from the winding side to the supply side by the fall detection circuits 7M and 7S detecting the fall of the current. It is a supply side motor circuit. Each circuit 5
The tape end is detected by M to 7M and 5S to 7S.

Further, 9A to 9D are magnetic heads for recording which are connected to the magnetic heads 1A to 1D through an amplifier (not shown), 10 is a switch for switching the output of the fall detection circuit 7S, and 11A and 11B are the switches. Second timer circuit connected to 10, 12 D-type flip-flop (hereinafter referred to as D-FF), 13 mono-multivibrator (hereinafter referred to as MM), 14 light emitting diode, 15 light emitting diode 14 Is a power source that lights up. The second timer circuit 11A is for 8x speed [4.8
× 8 = 38.4 (cm / S)], the second timer circuit 11B is 1
It is a timer circuit for 6 × speed [4.8 × 16 = 76.8 (cm / S)], and the set time is, for example, 90 seconds for the second timer circuit 11A in consideration of the tape end detection delay time of 150 msec.
5 msec, and the second timer circuit 11B is set to 1377.5 msec. When the light emitting diode 14 lights up,
A winding prohibition signal is input to the supply side motor circuit 8B.

FIG. 2 is an explanatory diagram showing the time relationship between the end portion of the tape and the signal output at the end portion, and the same reference numerals as those in FIG. 3 indicate the same portions.

In this figure, T _MM represents the tape length for a predetermined time, for example, 2 seconds, when the first timer circuit 4 outputs the output signal when the reproduction signal is not continuous.

Further, T _SW is a winding time for winding the 36 cm long leader tape L _ES at 8 times speed, that is, 945 msec, T _SL is a delay time set to detect the tape end, that is, 150 msec, and T _C is the predetermined time. Winding time T _SW from T _MM
And a delay time T _SL , for example, T _MM = 2se
c, T _SW = 945 msec, T _SL = 150 msec,
It becomes 905 msec. The leader tape L _ES varies depending on the tape, and the maximum (36 cm) and the minimum (24 cm)
cm) may extend to 12 cm.

Next, the operation of the dubbing apparatus of the present invention will be outlined with reference to FIG.

First, the tapes mounted on both recorders M and S are run, the signal S _M is reproduced by one of the magnetic heads 1A to 1D, and this reproduced signal is recorded by the other magnetic head 9A to 9D. At this time, when the reproduction signal detection circuit 3 of the master recorder M does not detect the reproduction signal continuously for a predetermined time such as between songs, an output signal is sent from the first timer circuit 4 each time.

Then, when a predetermined time T _MM elapses after the tape is wound to the winding side and approaches the tape end, and the reproduction signal is no longer detected, the first timer circuit 4 outputs an output signal. After that, in the master recorder M, the tape is completely wound up on the winding side. And each circuit 5M-
When the running stop of the tape (tape end) is detected at 7M, the supply side motor circuit 8M is controlled next, and the tape is wound on the supply side. On the other hand, in parallel with this, when the slave recorder S also completely winds the tape on the winding side and detects the tape end, the output signal is input to the supply side motor circuit 8S and the second timer circuit 11A. It Therefore, when it is determined that the dubbing is completed as described later, the supply side motor circuit 8S is controlled to wind the tape on the supply side, but when it is determined that the dubbing is incomplete. In this case, the winding prohibition signal is input to the supply side motor circuit 8S and the winding of the tape is stopped.

Next, referring to FIG. 2, the first and second timer circuits 4, 11
Together with A, the determination of whether the dubbing is complete or not will be described. In addition, in FIG. 1, in the initial state, the D-FF is used.
Since the terminal D of 12 is at "H" level and the terminal is at "H" level, the light emitting diode 14 is off.

As described above, the tape approaches the end and the magnetic tape T _M
When the signal S _M disappears, the first timer circuit 4 sends out the output signal 2 seconds after the reproduction signal disappears. When the first timer circuit 4 outputs the output signal at the same time or after that, when the second timer circuit 11A sends the tape end output signal, as will be understood from the second description, the leader tape L _ES Even if the distance is 36 cm, the reproduced signal is completely recorded on the magnetic tape T _S. That is, in this case, the output signal from the first timer circuit 4 is sent from the MM 13 to the D-FF 12 as a trigger signal, but since the output of the D-FF 12 does not change, the light emitting diode 14 does not light up, and after that, Even when the output signal from the second timer circuit 11A is output to the terminal R as a reset signal, the trigger signal is the first timer circuit 4
Since it is not output from the D-FF 12, the output of the D-FF 12 does not change and the light emitting diode 14 does not light up, indicating that the dubbing has been completed. At this time, by comparing the lengths of the tapes mounted on both recorders M and S, the dubbing is completed even if the slave recorder S is shorter.

In addition, the second timer circuit 11A outputs the reset signal D first.
-When the trigger signal from the first timer circuit 4 is input to the terminal R after being sent to the terminal R of the FF 12, the D-FF
Reference numeral 12 is a reset signal, the reset signal is released, the terminal becomes "L" level, the light emitting diode 14 lights up to indicate that the dubbing is incomplete, and at the same time, the winding prohibition signal is sent to the supply side motor circuit 8S. It is prohibited to wind the tape around the supply side.

It should be noted that in the above embodiment, the second timer circuit 11A for 8 × speed is used.
The case of dubbing was explained above, but the switch 10
Even if the second timer circuit 11B for 16x speed is switched by changing the above, it is possible to determine whether or not the dubbing is completely performed by the same operation.

Further, although the display means lights the light emitting diode 14 to display the incomplete dubbing, the light emitting diode 14 may be turned off or blinked to display the incomplete dubbing. The light emitting diode 1 is used as the display means.
4, a buzzer or the like may be used, and the display means may be provided near the tape (cassette) mounting portion of the slave recorder S. Further, although one slave recorder S is provided for the master recorder M, a plurality of slave recorders S may be provided, and when there is no delay time T _{SL for} tape end detection, the set time T _C is set.
Will be longer by that amount.

In addition to the audio dubbing, the VTR tape dubbing can be performed in the same manner by detecting the sync signal as the reproduction signal.

〔The invention's effect〕

As described above, in the dubbing apparatus of the present invention, the master tape recorder is provided with the reproduction signal detection circuit and the first timer circuit, and the slave tape recorder is provided with the tape end detection circuit, the second timer circuit, and the determination circuit. The display means is provided to determine whether the dubbing is complete or incomplete by comparing the end of the magnetic tape passing through the magnetic head of the slave tape recorder and the end of the reproduction signal. Therefore, there is an advantage that it can be easily determined whether or not the dubbing is complete.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram, and FIG. 3 is a diagram showing a recording surface of a tape. In the figure, M is a master tape recorder, S is a slave tape recorder, 3 is a reproduction signal detection circuit, 4 is a first timer circuit, 5S is a reel base rotation detection circuit, 6S is a rectification circuit, 7
S is a fall detection circuit, 11A is a second timer circuit, 12
Is a D-type flip-flop, and 14 is a light emitting diode.

Claims (1)

[Claims] 1. A dubbing apparatus including a master tape recorder and at least one slave tape recorder, wherein the master tape recorder includes a reproduction signal detection circuit.
A first timer circuit for detecting that the reproduction signal detection circuit does not detect the reproduction signal for a predetermined time continuously is provided, and when the tape end detection circuit and the tape end detection circuit detect the tape end, the slave tape recorder is detected. A second timer circuit that is set, a determination circuit to which the outputs of the first and second timer circuits are input, and display means are provided, and the set time of the second timer circuit is at least the predetermined time from the predetermined time. Controlling the display means in accordance with the order of the signals of the first timer circuit or the second timer circuit input to the determination circuit, with the time obtained by subtracting the time taken by the slave tape recorder to wind the leader tape. Characteristic dubbing device.