JPS6059644B2 - magnetic tape device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic tape devices for audio purposes, and more particularly to magnetic tape devices having two operatively related tape transports mounted on a single deck.

The present applicant is currently manufacturing and selling this type of audio magnetic tape device under the trade name "Dubbing X."

This system has master and slave tapes and transports. Among the various operating modes, the most distinctive point is that the selected part of the program played by the master or transport can be transferred to the slave or
It can be recorded on transport tape. In addition to these functions, when two transports are set to the same operation mode (recording, playback) at the same time, only one predetermined transport is allowed to execute that mode. This is intended to expand the operating range. FIG. 1 shows a dual cassette stereo deck incorporating the present invention.

Deck 10 has two tape transport sections 12 and 14. Each transport section 12 and 14 has a magnetic tape cassette storage location 16 and 18. A transparent cassette cover 22 is removably hinged with a set screw 20. Each transport section has various operation buttons. The first transport section 12 has a recording (REC) button 2 and a rewind (RWD) button.
) button 26, fast forward (FF) button 28, play (PLAY)
Button 30, STOP button 32, PAUSE
) has a button 34. Similarly second transport section 1
4, REC button 36, RWD button 38, FE button 40, PL
It has an AY button 42, a STOP button 44, and a PAUSE button 46. The deck 10 has various operating means and operating status monitoring means.

48, 50 and 52 are slide positioning type tape level adjustment knob, line input level adjustment knob, microphone
A level marker 54 is also provided, which is a level adjustment knob, and can preset the positions of these knobs.

56 is a level meter for the left channel, and 58 is a level ◆ meter for the right channel.

A bush ● bush ● switch type power switch 60 is provided on the front panel. Furthermore, on the front panel,
A monitor input selector switch 62 in the form of a three position switch and a position monitor switch are provided. Deck 1
The front panel of the 0 has two level meters as well as a first
Tape related to the transform ◆Counter 66, counter reset button 68, memory switch 70, bias selection switch 72, and equalizer selection switch 74
and a tape counter 76, a counter reset button 78, and a memory switch 8 related to the second transport.
0, a bias changeover switch 82 and an equalizer changeover switch 84. Further, 86 indicates a relay switch means, and 88 indicates a function display means consisting of five light emitting diodes. Deck 10 has two operatively associated tape transport sections 12 and 14 that can accomplish a variety of functions.

Each transport part. Each can perform independent recording and playback modes. Once again, recording and playback of one transport section can be automatically followed by recording and playback of other transport sections. Dubbing related to mutual transport parts can be performed in a simple manner.
FIG. 2 is a schematic diagram of the operating circuit of the deck 10 shown in FIG.

Please note that it is actually a stereo configuration.
Reference numeral 100 indicates a recording/reproducing head associated with the first tape transport unit 12, and reference numeral 102 indicates a recording/reproducing head associated with the second tape transport unit 14.

Relay 104 has two switch circuits 106 and 108. In the switch position shown, the relay is connected so that the first tape transport unit 12 is in the recording mode and the second transport unit 14 is in the playback mode. When relay 104 is energized, this relationship is reversed. That is, the electric circuit is set so that when any one of the transformer ports is in the recording mode, the others are in the reproduction mode. Energizing contacts of switch circuit 106 and switch circuit 10
8 unenergized contacts are regenerative amplifiers 110 and 111, respectively.
to the mixing amplifier 112 via. The regenerative amplifier includes means for equalizing the regenerated signal. Transistors 113 and 114 effectively ground each signal path when turned on. Transistor 116 primarily serves for muting operations. The playback signal through the removable jumper connection is applied to a slide volume 120 associated with the tape level control knob 48 of FIG. 124. The reproduced signal passing through this switch 122 is applied to the source contact 128 of the switch 126 corresponding to the monitor switch 64 in FIG. and is applied to a headphone terminal 134 and a meter 136 via a headphone amplifier 133. meter 1
36 corresponds to the level meters 56 and 58 in FIG.
The headphone terminal 134 corresponds to the headphone jack 90 in FIG. The microphone input from the microphone input terminal 138 corresponding to the microphone jack 92 in FIG. 1 is connected to the microphone level adjustment knob 5 in FIG.
2, and the microphone contact 1 of the monitor input selector switch 122.
44.

The signal from line input terminal 146 is input to line amplifier 148.
It is applied to the slide volume 150 corresponding to the line input level adjustment knob 50 in FIG. The signals from each volume 120, 142 and 150 are applied via a mixing amplifier 154 to one end of a jumper connection 156 similar to jumper connection 118 described above. An accessory selector 158 is provided whose common contact is connected to the record terminal 159 of the monitor switch 126 and whose other terminals are connected to each end of the jumper connection path. The other end of the jumper path 156 is connected to a recording amplifier 160 associated with the first transport section 12 and connected to a recording amplifier 160 associated with the second transport section 14.
62. Transistor switches 164 and 165 are provided on the input side of each recording amplifier. When these transistors 164, 165 are turned on, the inputs to their respective amplifiers are effectively grounded. Jumper connections 118 and 156 can be connected to, for example, a "Truby" noise reduction device.

In that case, the accessory selector 158 is moved from the illustrated position to a position such that the common contact and the output of the mixing amplifier 154 are connected. Therefore, the output of the amplifier 154 is displayed on the monitor and is also provided to the recording amplifier via the noise reduction device connected to the connection path 156. When the accessory switch 158 is in the position shown, the signal at the output of the connection path 156, ie the output of the noise reduction device, is monitored via the common contact of the switch 158. If connection 156 is simply connected by a jumper wire, switch 158 will provide the same signal to the monitor regardless of its position.
A connection configuration similar to accessory switch 158 may be provided in connection path 118. In that case, the common contact connects to tape contact 124 (switch 122). Therefore, with this configuration, just by operating a switch,
You can change the monitor status. Monitor●Select●
The switch 130 is an electronic switch and includes a first switch 170 and a second switch 172.

The first switch 170 responds to the REC button 24 of the first tape transport 12 and, when pressed, moves from the switch position shown in the figure to another position. Second switch 17
2 is the REC button 36 of the second tape transport 14
When it is pressed, it moves from the switch position shown in the figure to the other switch position. That is, when one of the REC buttons is pressed, the switch 126 and the line output terminal 132 are pressed.
are connected, thus allowing recording monitoring or monitoring of each recording input (as determined by switch 122). On the other hand, if neither REC button is pressed, the switches 170 and 172 are in the illustrated position, and therefore the playback output of the connection path 118 is monitored, and the playback output terminal 13 is monitored.
Occurs in 2. A deck 10 incorporating the present invention may be used in various combined or correlated modes of operation of the first tape transport 12 and the second tape transport 14, as described above. It can take different operating modes.

FIGS. 3 and 4 show control circuits for this purpose. In FIG. 3, means 300 and 302 are provided for sensing the tape drive status of the first and second transports. The switch 304 is turned on in response to the operation of the PLAY button, FF button, and RWD button of the first transport 12. Similarly, switch 306 connects the second transformer 14
It turns on in response to the operation of the PLAY button, FF button, and RWD button. In each transformer, as long as the reel stand is rotating, the outputs 301 and 30 of the detection means 300 and 302
A positive voltage develops across transistor 308, which causes transistor 308 to
and 310 are turned on. When the reel stand stops rotating and there is no output, the auto-stop solenoids 312 and 314 are deenergized, and the operating mode set by the operation button on each transformer is released. Circuits 316 and 318 are timer start circuits for the first, first and second transport sections, respectively. Each circuit has a timer start plunger 320 and 322. Transistor 324 constitutes part of a timer start priority circuit for the first tape transport. Transistor 326 prioritizes operations related to the first tape transport in continuous recording and continuous playback modes. It forms part of the priority circuit. Terminal 328 is provided with a relay (continuation) instruction signal, which will be described below in connection with FIG. FIG. 4 shows a circuit for controlling relay 104 and transistors 113, 114 and 164, 165 of FIG.

Pressing the PLAY button associated with the first transport 12 turns off the normally closed (NC) type switch 400. Therefore, transistor 40 which is normally kept off
2 turns on. When the transistor 402 is turned on in this manner, the potential of the terminal 404 becomes the ground level.
Since terminal 404 is connected to the base of transistor 113 (FIG. 2) on the output side of regenerative amplifier 110 associated with the first transport section, this change to ground level is normally turned on. Turn off transistor 113. Also, opening switch 400 increases the level of line 406 from ground level to some positive level;
Transistor 408 turns on. Therefore, the light emitting diode 410 lights up. The LED 4IO is illuminated to indicate that the first transport 12 is in playback mode.
When the PALY button of the second transformer boat 14 is pressed,
Normally closed switch 412 is turned off. This turns on transistor 414, which turns off the second reproducing side transistor of FIG. 2 via terminal 416. On the other hand, opening of switch 412 causes the level of line 418 to go to a positive potential, thus turning on transistor 420, which causes LED 422 to emit light. Illumination of LED 422 indicates that the second transport is in playback mode. When the PALY buttons of two transports are pressed at the same time, means is provided for giving priority to reproduction of only the first transport section. This consists of a diode 424. That is, by applying a positive voltage to the terminal 416, the transistor 114 is turned on. As mentioned above, when transistor 402 for the first transport regeneration mode is turned on, line 426
is at ground level, so transistor 428 is turned off.

Therefore, the predetermined amount (4) by the time constant circuit 430. After a delay of 0.000000000 0000, transistor 432 turns on, which energizes relay 104. That is, relay switches 106 and 108 in FIG. 2 are reversed from their illustrated positions, and switch circuit 106 connects head 100 associated with the first transport to regenerative amplifier 110. FIG. 4 shows switches 434a, 434b, 434c, and 434d that respond to the REC button of the first tape transport, and switches 436a, 436b, and 436c that respond to the REC button of the second tape transport. ing.

The figure shows all of these switches in the off position, i.e. REC
The button is shown unpressed. When the REC button on the first tape transport is pressed (the recording mode setting requires that the PALY button be pressed),
Switch 434a turns transistor 402 off. This turns on the muting transistor of FIG. 2, deenergizes relay 104, and turns off transistor 408, stopping LED 410 from emitting light. Switch 434b removes the +B voltage from terminal 438, thereby turning off muting transistor 164, which had been kept on, and thus freeing the input of the recording amplifier associated with the first transport from ground. Switch 434c causes LED 44O to emit light.
This indicates that the first transport is in recording mode. On the other hand, when the REC button of the second transport is pressed, switch 436a turns off transistor 414. This will provide a positive voltage at terminal 416, thus turning mutating transistor 114 on. Additionally, turning off transistor 420 results in
The LED 422 stops emitting light. Switch 436b removes the +B voltage from terminal 442, thereby turning mutating transistor 165 off. switch 43
6c lights up the light emitting diode 444. This is the second
indicates that the transport is in recording mode. Even if the REC buttons of two transports are pressed at the same time, the deck 10 will prioritize the first tape transport and put it into recording mode.

That is, the simultaneous transition of switches 434b and 436b is +
B voltage is applied to terminal 442. This is transistor 16
Turn on 5. Activation of switch 436c also transfers the base bias voltage of transistor 428 to diode 45.
Bypass to ground through 0.

This turns off transistor 428 and then turns on transistor 432, energizing relay 104. As described above, each muting transistor 113, 114, 164, 165 is configured so that when both transports are set to the same operating mode of recording or reproducing, the operating mode of the first transport is executed with priority. controlled. The deck 10 according to the embodiment of the present invention is capable of continuous recording and continuous playback.

For this purpose, a relay switch 452, which corresponds to relay switch 86 of FIG. 1, is provided. This switch is shown in the off position in the figure. That is, in this off position, the +B potential is always applied to the base of transistor 454. This continuous mode of operation is only set if the first and second transports are played or commanded simultaneously. When transistor 454 is turned on, terminal 328 of FIG. 3, which is connected to terminal 456, is at ground.

This indicates that transistor 326 of FIG. 3 will not turn on. When the relay switch 452 is turned on,
+B voltage is applied to transistor 460 via LED 458. In this state, the conditions for the transistor 454 to turn off are that the transistors 402 and 414 are on at the same time, that is, the PLAY buttons of both transports are pressed and the switches 400 and 412 are turned off, and the REC switch of both transports is turned off. When the button is pressed, switches 434d and 436c are switched, and line 462 is connected to diode 450.
and when it is grounded through. At that time, terminal 456
and 328 are released from ground, so when the first tape transport autoswitches, this pulse signal turns on transistor 326 and turns on transistor 319 of the timer start circuit, causing the second tape transport to switch on. - Energize the plunger 322 that releases the PAUSE button on the transport. The no-base bias condition of transistor 454 (FIG. 4) is similar to that of transistor 468.
Turn off.

As a result, transistor 460 turns on, which causes LED 458 to illuminate. This is deck 10
Indicates that the is in continuous recording or continuous playback mode (relay ● mode). FIG. 5 is a layout diagram of relay switches 86, 452 and function display means 88.

The function display means includes LEDs 410 and 440 representing playback and recording associated with the first transport, and LED 42 representing playback and recording associated with the second transport.
2,444, and an LED 458 indicating the relay ● mode in which the relay ● switch is turned on. Therefore, when dubbing from the first tape transport to the second tape transport, LEDs 41O and 444 are lit, and when dubbing from the second transport to the first transport, LEDs 422 and 440 are lit. .
For continuous playback, the relay switch is turned on and the LED
4lO, 458 and 422 are lit, and L for continuous recording.
ED44O, 458 and 444 are lit. other than that,
PLAY alone. ．． Display of REC becomes possible. With the above-described configuration, the playback LED is turned off during recording. During dubbing in either direction, the relay mode indication LED will not light up even if the relay ● switch is turned on. This is because the relay ● mode is always provided only when both transports are set to record or playback. The deck 10 is capable of continuous timer playback and continuous timer recording.

Set both transformers to recording or playback, and press PAUS.
If the E button is held down and the relay switch 452 is off, the first transport that has priority at the first set time will start recording or playing, and it will automatically start recording or playing.
After stopping, the second tape transport starts recording or playing at the next second set time. If the relay switch 452 is turned on, the first and second tape transports start continuous recording or continuous playback in the manner described above from the first set time. The deck 10 further has a muting function. That is, it is desirable to prevent the reproduction signal from being applied to the reproduction electric circuit for a predetermined period of time during only reproduction, for example, a period sufficient to prevent noise caused by the above-mentioned head switching relay 104 or noise caused by turning on the power. For this purpose, a muting transistor 116 is provided in FIG. 2 to short-circuit the input of the mixing amplifier 112 for a predetermined period of time. However, this transistor
Muting alone is insufficient and an excessive shock signal will still pass through to the subsequent stage. Therefore, the above-mentioned transistors 113 and 114 are used together for this muting to provide a double muting function. The state transition of the collector of transistor 402 or the base potential of transistor 402 that becomes PLAY switch 400 and REC switch 434a associated with the first transfer is applied as a pulse signal to transistor 480, turning it on.

Therefore, capacitor 482 is discharged. transistor 4
When 80 is turned off again, capacitor 482 begins charging and transistor 486 is turned off until its charging potential exceeds the barrier voltage level of the Zener diode. Therefore, during this time a positive level voltage is developed at terminal 488, which is applied to the base of transistor 116 of FIG. 2, turning it on. Additionally, the positive voltage at terminal 488 is applied to terminals 404 and 416 through diodes 490 and 492, respectively, thereby turning on transistors 113 and 114, respectively. The period during which these mutating transistors 116, 113, and 114 are turned on depends on the charging/discharging time constant of the capacitor 482.
Usually it is set to 1 to 2 seconds. Means is provided for providing a muting function when neither the PLAY button on the first or second transport is pressed. This consists of transistor 494. Which PL
If the AY button is not pressed, switches 400 and 41
2 is in the on state, so there is no bias applied to the base of transistor 494, which is off. Therefore, terminal 488 is provided with a positive voltage muting signal. Pressing either PAL, Y button turns on transistor 494, which removes the muting voltage from terminal 488.

[Brief explanation of the drawing]

FIG. 1 shows a dual cassette stereo deck incorporating the present invention, with FIG. 1A being a front view thereof and FIG. 1B being a top view thereof. FIG. 2 is a block circuit diagram showing the internal configuration and connections of FIG. 1, and FIGS. 3 and 4 are diagrams showing various control and monitor instruction circuits for the decks of FIGS. 1 and 2. . FIG. 5 is a diagram showing the function display means used in the deck of the circuit of FIGS. 1-3. In the figure, 324 indicates a transistor, and 424 indicates a diode.

Claims (1)

[Claims] 1. In a magnetic tape device containing two separately operable magnetic tape transports in the same deck,
A first recording and playback amplification circuit provided corresponding to the first transport, a second recording and playback amplification circuit provided corresponding to the second transport, and a first recording and playback amplification circuit provided corresponding to the second transport; recording and playing the second transport;
A switch means provided between the first and second transports and the first and second recording and reproducing amplifiers for selectively performing reproduction of the first transport and recording of the second transport. a reproduction and recording processing circuit that connects the outputs of the first and second reproduction amplifier circuits to the inputs of the first and second recording amplifier circuits; and a reproduction and recording processing circuit that connects the outputs of the first and second reproduction amplifier circuits to the inputs of the first and second recording amplifier circuits; The first and second recording muting circuits, the first and second playback muting circuits that mute the outputs of the first and second playback amplifier circuits, and both transports are set to the same operation mode of recording or playback. The present invention is characterized by comprising a priority circuit that controls the first or second recording muting circuit and the first or second reproduction muting circuit so that the operation mode of one of the transports is executed preferentially when Magnetic tape device.