JPS6055895B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to recording a reproduction signal of a first magnetic recording/reproducing device for recording music signals etc. transmitted from a broadcasting station etc. onto a magnetic tape using a second magnetic recording/reproducing device. (hereinafter referred to as print).

), the purpose of which is to generate a first magnetic recording signal between the end of a reproduced signal of a first magnetic recording/reproducing device continuously recorded and the start of the next reproduced signal that is reproduced after the end of the reproduced signal. The recording/reproducing device is placed in a playback pause state, the second magnetic recording/playback device that was printing the reproduction signal of the first magnetic recording/playback device is placed in a recording pause state, and then the second magnetic recording/playback device is placed in a recording pause state.
Release the recording pause state of the magnetic recording/reproducing device, rewind the magnetic tape for a certain period of time, set it to the playback state, release the playback state where the end of the playback signal was detected, put it into the recording pause state again, and then The first magnetic recording and reproducing device is released from the playback pause state, and the second magnetic recording and reproducing device is released from the recording pause state at the start of the next playback signal to enter the recording state, and the printed second magnetic To provide a magnetic recording and reproducing device which can increase the recording density of a magnetic tape of the recording and reproducing device and can eliminate bias signals recorded on the magnetic tape when recording is paused and noise during reproduction caused by magnetic tape hunting. It is in. First, a conventional example will be explained with reference to the drawings.

In FIGS. 1 and 2, 1 is a supply reel, 2 is a magnetic tape, 3 is a guide post, 4 is an erasing head, 5 is a recording head, 6 is a reproducing head, and 7 and 8 are rotating capstans 9. The tape clipper is shown in relation to the operation of the pinch roller 10 being pressed.

When the pinch roller 10 presses the capstan 9, the tape reptors 7 and 8 move in the direction of the arrow, and the magnetic tape 2 moves in the direction of the arrow 2 due to the cooperation of the capstan 9 and the pinch roller 10.
It is transported in the direction of a. 11 is a tape guide, and 12 is a take-up reel.

Reference numeral 13 denotes an input terminal to which an input signal is applied; the input signal is applied to an input signal amplification circuit 14 via an input signal level adjustment volume V, and its output is sent to a recording signal amplification circuit 15 having predetermined frequency characteristics and a signal monitor switch 5. , join the i side of . The output of the recording signal amplifying circuit 15 is connected to one of the outputs of the erasing signal generating circuit 16, that is, the bias of the recording signal, and the switch s. The other output of the erase signal generating circuit 16 is applied to the erase head 4. The recording head 5 is connected to the switch S2 via the switch 1 in accordance with the recording operation described later.
connected to. Reference numeral 17 denotes a reproduction signal amplification circuit for amplifying the reproduction signal of the reproduction head 6, which outputs the reproduction signal to the mouth side of the monitor switch S1, contrary to the frequency characteristics of the recording signal amplification circuit 15.

18 is an output signal amplification circuit that amplifies the signal from the monitor switch S1, and outputs the signal to the output terminal 19.

Reference numeral 20 denotes a relay that opens and closes the power supply for a plunger (not shown) that presses the pinch roller 10 against the capstan 9, and the power supply for an electric motor (not shown) that drives the supply reel 1 and take-up reel 12.

21 is a relay related to switch S4, which is energized when switch (2) is energized, and switch S is energized.

Moreover, when switch S6 is energized to the opening side, relay 20 is connected via switch S4 and relay 22 is connected via diode D1.
are respectively energized. Relay 22 is associated with a plunger power on/off switch that releases the brakes (not shown) on supply reel 1 and take-up reel 12. That is, when the relay 22 is energized, the plunger is energized, and the brakes of the supply reel 1 and take-up reel 12 are released.
The supply reel 1 and the take-up reel 12 are rotatable.
Switch S7 is connected to relay 22 via relay 23 and diode D2, which are related to the fast-forward operation of magnetic tape 2, and when energized to the front side, relays 23 and 22 are energized, and the magnetic tape is fast-forwarded. A switch S8 connects a relay 24 and a diode D related to the rewinding operation of the magnetic tape.
The magnetic tape 2 is connected to a relay 22 via a magnetic tape 3, and when the magnetic tape 2 is energized to the opening side, the relays 24 and 22 are energized and the magnetic tape 2 is rewound. Next, the operation of each part will be described.

First, when recording music signals transmitted from a broadcasting station etc. on the magnetic tape 2 continuously, add the music signal to the input terminal 13, adjust the recording level of the music signal with the input signal level adjustment volume ■1, and then The signal is outputted to the switch S2 via the amplifier circuit 1.4 and the recording signal amplifier circuit 15. In addition, when monitoring the music signal to be recorded, the monitor switch S1 is energized to the A side, and the signal is outputted to the output terminal 19 via the output signal amplification circuit 18. Next, switch S3-1, S3-
2 to the mouth side, the erasing signal generating circuit 16 is energized, an erasing signal is applied to the erasing head 4, and a bias for the music signal to be recorded is applied to the switch S2. Next, when the switch S6 is energized to the opening side, the relay 20 and the relay 22 are energized through the diode D1 through the switch S, and become 0N state, and the switch S2, which is related to the operation of the relay 20, is turned to the opening side. The music signal to be recorded and the bias of the music signal which have been energized and applied to the switch (3) are applied to the recording head 5 via the switches S2 and S3-1. Also, a plunger and supply reel 1 that press the pinch roller 10 against the capstan 9 in accordance with the operation of the relay 20;
The electric motor that drives the take-up reel 12 further drives the supply reel 1 and the take-up reel 12 as the relay 22 operates.
The plunger which releases the brake of
0, the magnetic tape 2 is transferred at a constant speed in the direction of the arrow 2a, and the tape lifters 7 and 8, which are related to the pressing operation of the pinch roller 10, move in the direction of the arrow, and the magnetic tape 2 is transferred to the erase head, the recording head 5, and the reproducing head 6. The music signal is recorded on the magnetic tape 2 by contacting and running.

The music signal recorded in this way is reproduced from the reproduction head 6 and applied to the mouth side of the monitor switch S1 via the reproduction amplification circuit 17. Therefore, when monitoring the reproduction signal of the recorded music signal, Monitor switch S1
is energized toward the mouth side and outputted to the output terminal 19 via the output signal amplification circuit 18. Furthermore, if you want to temporarily stop the recording operation, energize the switch S5 to the opening side, energize the relay 21, energize the switch S4 to the opening side, and then
All you have to do is turn off the power. To perform recording again, switch ■ is energized to side A, relay 21 is de-energized, switch S4 is energized to side A, relays 20 and 22 are energized again, and the magnetic field is removed by the above operation. A music signal is recorded on tape 2. To end recording, the switch S6 is energized to the A side, and the switches S3-1 and S3-2 are energized to the A side. When reproducing the music signal recorded as described above, by energizing the switch S8 to the opening side, the relays 24 and 22 are energized to rewind the magnetic tape 2 onto the supply reel 1, and then the switch S6 is turned to the opening side. When energized, the relays 20 and 22 are energized, and the music signal recorded on the magnetic tape 2 is reproduced from the reproduction head 6 by the above-described operation, and the reproduction signal amplification circuit 17, monitor switch S1, and output signal amplification circuit are activated. It is outputted to the output terminal 19 via 18. Playback signal a of the music signal continuously recorded by the operation described above
When printing on another second magnetic recording and reproducing device having the same configuration, the monitor switch S1 of the first magnetic recording and reproducing device is
When the switch S6 is energized to the opening side and the switch S6 is energized to the opening side, the music signal recorded on the magnetic tape 2 by the above-described operation is outputted to the output terminal 19 as a reproduction signal a.

Next, connect the input terminal 13 of the second magnetic recording and reproducing device to the output terminal 19 of the first magnetic recording and reproducing device, and adjust the recording level with the input signal level adjustment volume 1 of the second magnetic recording and reproducing device. , switches S3-1, S3-2 and S6
When energized toward the mouth side, the reproduction signal a of the first magnetic recording/reproducing device is printed on the second magnetic recording/reproducing device by the above-described operation. However, as shown in FIG. 2, the reproduction signal a of the first magnetic recording/reproducing device is reproduced at the next reproduction signal start section 26 with a time delay from the reproduction signal end section 25.
Nothing is recorded on the magnetic recording/reproducing device for a certain period of time, and the use of the magnetic tape 2 during this period becomes uneconomical. As a countermeasure against this problem, generally the recording state of the second magnetic recording/reproducing device is temporarily stopped after a time delay from the reproduction signal termination section 25. As shown in waveform b, the switch (2) of the second magnetic recording/reproducing device is energized to the front side after a delay of time ζ from the playback signal end section 25, and then switched to the "a" side again when the playback signal start section 26 is played back. All you have to do is support them. However, if the switch S5 is energized to the open side, the supply of the bias signal to the recording head 5 is instantaneously stopped in relation to the operation of the switch S2, as shown in C. In addition, in relation to the operation of the switch S4, the plunger that presses the pinch roller 10 against the capstan 9 is de-energized, and the constant speed transfer of the magnetic tape 2 is carried out for a period of time when the switch S4 is energized to the opening side as shown in waveform d. It stops after a delay of T2. Further, since the magnetic tape 2 is separated from the erasing head, the recording head 5, and the reproducing head 6 by the tape lifters 7 and 8 related to the operation of the pinch roller 10, the magnetic tape 2 comes to a stop while causing hunting. Therefore, when this part is reproduced, the hunting of the magnetic tape 2 and the recording head 5 as shown in waveform e 27 occur.
The instantaneous stoppage of the bias signal supplied to the magnetic disk generates noise, making the printed reproduction signal, that is, the reproduction signal of the second magnetic recording and reproduction device, very unpleasant. The present invention deals with the effects of noise caused by hunting of the magnetic tape, instantaneous stop of the bias signal, etc., which occurs between the end of a reproduced music signal and the start of the next reproduced music signal on a reprinted magnetic tape for the reasons described above. In addition to being able to eliminate the playback signal, it is also possible to automatically detect and stop the end of the playback signal, making it possible to extremely increase the recording density of the printed magnetic tape.

A case in which the present invention is implemented in a conventional magnetic recording/reproducing device will be described below with reference to FIGS. 3 and 4.

1 is a supply reel, 2 is a magnetic tape, 3 is a guide post,
4 is an erase head, 5 is a record head, 6 is a play head, 7
, 8 is a tape lifter that operates in the same way as in the conventional example;
9 is a capstan, 10 is a pinch roller, 11 is a guide post, and 12 is a take-up reel.

13 is an input terminal, the input signal is applied to the input signal amplification circuit 14 via the input signal level adjustment volume 1, and the output thereof is input to the recording signal amplification circuit 1 having predetermined frequency characteristics.
5 and the A side of the signal monitor switch S1.

The output of the recording signal amplifying circuit 15 is applied to the recording head 5 together with one of the outputs of the erasing signal generating circuit 16, that is, the bias of the recording signal, via switches S2, S3-1, and S9-2. The other output of the erase signal generating circuit 16 is applied to the erase head 4. Reference numeral 17 denotes a reproduction signal amplification circuit for amplifying the reproduction signal of the reproduction head 6, and outputs it to the mouth side of the monitor switch S1.

Reference numeral 18 denotes an output signal amplification circuit that amplifies the signal from the monitor switch S1, and outputs the signal to the output terminal 19.

20 is a power supply and supply reel 1 for a plunger (not shown) that presses the pinch roller 10 against the capstan 9;
This is a relay that opens and closes the power supply of the electric motor (not shown) that drives the take-up reel Jl2.

Reference numeral 21 denotes a relay related to the switch S4, which is energized when the switch (2) is energized to the opening side, and the switch S4 is energized to the opening side.

Also, when switch S6 is energized to the open side, relay 20 is connected via switch S, and relay 2 is connected via diode D1.
2 are respectively energized. Relay 22 is associated with a plunger power on/off switch that releases the brakes (not shown) on supply reel 1 and take-up reel 12. That is, when the relay 22 is energized, the plunger is energized, the brakes on the supply reel 1 and the take-up reel 12 are released, and the supply reel 1 and the take-up reel 12 become rotatable. The switch S7 is connected to the relay 22 through a relay 22 and a diode D2 related to the fast-forward operation of the magnetic tape 2, and when energized to the front side, the relays 23 and 22 are energized and the magnetic tape 2 is fast-forwarded. The switch S8 is connected to the relay 22 via a relay 24 and a diode D3 related to the rewinding operation of the magnetic tape 2, and when energized to the open side, the relays 24 and 22 are energized and the magnetic tape 2 is rewound. These are the same as the conventional one except for switch S9-1. Switches SlO-1 and S1 are connected to the mouth side of switch ① via switches S and -1.

-2 related relay 28, switch S,. 1. A resistor R1 is connected. The resistor R1 is grounded through a parallel connection of a resistor R2 and a capacitor C1, and is also connected to the base of a transistor T1 through a resistor, and a relay 28 is connected to the collector of the transistor T1. Switch Sl. -1 is connected to the relay 24, diode D3, and switch S8. A switch Sll-19 is connected to the mouth side of the switch S4 via a switch SIO-2.
Relay 29 related to S11-2, switch S, l-1
, S11-2, and a resistor R are connected. The resistor 2 is grounded through a parallel connection of a capacitor C2 and a resistor R5, and is connected to the base of a transistor T6 through a resistor 2, and a relay 29 is connected to the collector of the transistor T6. The switch Sll-1 is connected to the base of the transistor T3 and the collector of the transistor T4 via a resistor R7. The collector of transistor T3 is connected to capacitor C2, and the piece of transistor T is connected to capacitor C3 and diode D3 via resistor R8. The other end of the capacitor C3 is grounded, and the other end of the diode D is connected to the reproduced signal amplification circuit 17 via the polymer V2. There is. Next, the operation of each part will be described.

When recording a music signal sent from a broadcasting station or the like on the magnetic tape 2, add the music signal to the input terminal 13, adjust the recording level of the music signal to be recorded with the input signal level adjustment volume V1, and adjust the input signal. The amplification circuit 1 outputs the recording signal to the switch S2 via the recording signal amplification circuit 15.

In addition, when monitoring the music signal to be recorded, the monitor switch S1 is energized to the A side. Next, switch S3-1
, S3-2, the erase signal generating circuit 16 is energized via the switch S9-3 and an erase signal is applied to the erase head 4, and the erase signal is applied to the switch S2 as a bias for the music signal to be recorded.

Next, when the switch S6 is energized, the relay 20 is energized via the switch S4, and the relay 22 is energized via the diode D1, and the switch S2, which is related to the operation of the relay 20, is energized to the opening side. A music signal to be recorded and a bias signal are applied to the recording head 5 via switches S3-, S9-2, and a plunger that presses the pinch roller 10 against the capstan 9, and drives the supply reel 1 and take-up reel 12. The plungers which release the brakes of the supply reel 1 and the take-up reel 12 associated (with the operation of the motor, relay 22) are energized at the same time, so that the magnetic tape 2 is moved between the capstan 9 and the pinch roller 10.
The tape lifters 7 and 8 related to the pressing operation of the pinch roller 10 move in the direction of the arrow, and the magnetic tape 2 comes into contact with the erasing head, the recording head 5, and the reproducing head 6. The music signal is magnetic tape 2.
recorded in In order to monitor such recorded music signals, the monitor switch S1 may be energized toward the mouth side.

If you want to temporarily stop the recording state, energize the switch S5 to the open side, the relay 21 will be energized, the switch S will be energized to the open side, the relays 20 and 22 will be de-energized, and the magnetic tape 2 will be energized. stops running. When recording is to be performed again, the switch turtle is energized to the A side, and the magnetic tape 2 runs at a constant speed in the reverse operation to that described above, and the music signal is recorded. Next, when you want to stop recording, switch S6, S3-1, S
If 3-2 is energized to the A side, recording will be stopped.
Therefore, when the switch S8 is energized to the opening side and the relay 22 is energized via the relay 24 and the diode D3, the magnetic tape 2 is rewound from the take-up reel 12 to the supply reel 1, and the switch S6 is turned to the opening side again. By energizing the magnetic tape 2, the music signal recorded on the magnetic tape 2 can be reproduced by the reproduction head 6. A case will be described in which the reproduced signal a of the music signal continuously recorded by the above operations is printed on the second magnetic recording and reproducing apparatus having the same configuration. First, if the monitor switch S1 of the first magnetic recording/reproducing device is energized to the opening side and the switch S6 is energized to the opening side, the music signal recorded on the magnetic tape 2 by the above-mentioned operation is reproduced to the output terminal 19. It is output as signal a.

Next, connect the input terminal 13 of the second magnetic recording and reproducing device to the output terminal 19 of the first magnetic recording and reproducing device, adjust the recording level with the input signal level adjustment volume V1 of the second magnetic recording and reproducing device, Switches S3-1, S, -2 and S6
energized toward the mouth side, the reproduction signal a of the first magnetic recording/reproducing device is printed on the second magnetic recording/reproducing device by the above-described operation. Next, as shown in FIG. 4, the recording state of the second magnetic recording and reproducing device is temporarily stopped with a delay of time t1 from the end portion 25 of the reproduction signal a of the first magnetic recording and reproducing device.

Therefore, the switch (2) of the second magnetic recording/reproducing device and the switch (2) of the first magnetic recording/reproducing device are energized toward the mouth side. Next, switch S9 of the second magnetic recording/reproducing device
-1, S9-2, and S9-3 are energized to the mouth side, switches S9-1 and S1 are activated. The relay 24 is energized through the diode D3, and the relay 22 is energized through the diode D3, and the magnetic tape 2 is rewound from the take-up reel 12 to the supply reel 1. In this case, switches S9-1, S9-2, S
Since the recording head 9-3 is energized toward the front side, no signal flows to the erasing head or the recording head 5, and no recording is made on the magnetic tape 2. At the same time as switch S9-1 is energized to the power side, capacitor C1 is charged via resistor R1, transistor T1 is turned ON via resistor R3, and relay 28 is energized. In this case, the relay 28 becomes ON due to the resistor R2 and the time constant T3 of the capacitor C1. Next relay 2
8 becomes 0N, switches SlO-1 and S10-2 related to the operation of the relay 28 are energized to the mouth side, respectively.
The magnetic tape 2 is rewound for a time T3 and then stops. In this case, the time constant is set so that the ending portion 25'' of the music signal f printed on the magnetic tape 2 is at a position 30 that can be sufficiently reproduced by the reproducing head 6. Next, switch SlO-2
is energized to the mouth side, the switches S6 and S are activated by the above operation.
4 are energized on the port side, the capacitor C2 is charged via the resistor R4, the transistor T2 is turned ON via the resistor R6, and the relay 29 is energized.
In this case, the relay 29 becomes 0N due to the time constant of the resistor R and the capacitor C2. When relay 29 becomes 0N, relay 29
The switches Sll-1 and S11-2 related to the operation are energized to the mouth side, respectively, and the switch Sll-1 and the resistor R7
The base of the transistor T3 and the collector of the transistor T are energized through the transistor T3. Also, relay 2 is connected via switch Sll-2.
0, the relay 22 is energized via the diode D1, and the magnetic tape 2 starts running at a constant speed by the operation described above.

By running the magnetic tape 2 at a constant speed, the reproducing head 6 reproduces the recorded music signal f from position 30. Therefore, the reproduced signal is detected by the diode D4 via the reproduced signal amplification circuit 17 and the polymer V2, charged into the capacitor C3, and further applied to the base of the transistor T via the resistor tl/LR8. In this case, in the polymer V2, the transistor T is set to 0FF at a level where the level of modulation noise etc. reproduced from the magnetic tape 2, that is, the output of the reproduction head 6 is sufficiently small.
Adjust so that Therefore, if the reproduction signal from the reproduction head 6 is sufficiently large, the transistor T4 becomes 0N,
Since the base of resistor R and transistor T3 is grounded, transistor T becomes OFF, relay 29 remains energized, and magnetic tape 2 continues to run at a constant speed. When the reproduction signal from the reproduction head 6 becomes sufficiently small, that is, when the end portion 25'' of the reproduction signal is reproduced, the transistor T4 becomes OFF and the transistor T3 becomes ON, so that the capacitor C2 is grounded and discharged. Transistor T2 becomes 0FF, and relay 29 becomes 0FF.
Therefore, switch Sll-1 related to the operation of relay 29
, 11-2 are energized to the A side, and the magnetic tape 2 stops running. In this state, switches S9-,, S9-2, S9
-3 is again energized to the A side, the second magnetic recording/reproducing device enters the recording pause state. Next, the switch turtle of the first magnetic recording/reproducing device is energized to the A side, and the music signal recorded from the magnetic tape 2 is reproduced. Next playback music signal start section 26
At the same time as is being reproduced, the switch (2) of the second magnetic recording/reproducing device is energized to the A side to cancel the recording pause state and enter the recording state. Therefore, the reproduction signal g of the first magnetic recording/reproducing device is printed on the second magnetic recording/reproducing device again. When the second magnetic recording and reproducing device reprinted by the above operation is reproduced, hunting of the magnetic tape 2 that occurs in the recording pause state, instantaneous stop of the bias signal supplied to the recording head 5, etc. are the causes. It is possible to completely eliminate the noise 27 that occurs on the printed magnetic tape.

As described above, according to the present invention, the reproduced signal of the printed second magnetic recording/reproducing device becomes extremely good with noise completely removed, and when performing a printing operation, the magnetic tape is wound simply by energizing the switch. Since the end of the playback signal is automatically detected and stopped, it is a very simple operation, and the recording can be stopped immediately after the latest end when instructed to pause recording. Therefore, when the next signal is recorded again, the previous ending portion of the signal is not damaged, which greatly contributes to the spread of this type of magnetic recording/reproducing device.

It should be noted that the present invention is not limited to this embodiment, but can have the same effects as described above even when applied to a rotary head type magnetic recording/reproducing apparatus for recording video signals and the like.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a waveform diagram, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. 4 is a waveform diagram thereof. 2...magnetic tape, 5...recording head, 6...playback head, 9...capstan, 10...zentirola, 20...・・・・・・
Relay related to constant speed transfer of magnetic tape, 22...
...Relay related to releasing the brakes of the supply reel and take-up reel, 24...Relay related to the rewinding operation of the magnetic tape, 28, 29...Relay 2
Relays related to 0, 21, 24, S1~Sllll●●
●● switch.

Claims (1)

[Claims] 1. A magnetic head capable of recording and reproducing, a means for transporting a magnetic tape at a constant speed, a means for temporarily stopping the constant speed transport of the magnetic tape, a means for rewinding the magnetic tape, and a means for transporting the magnetic tape at a constant speed. signal determining means for detecting that the level of a reproduction signal from the magnetic head has fallen below a predetermined level; A magnetic recording and reproducing apparatus comprising a control means for transporting a magnetic tape at a constant speed in a reproducing state until a drop in signal level is detected and instructing a temporary stop.