JPS5817979B2 - 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 associated tape transports mounted on a single deck.

The object of the present invention is to provide a magnetic tape device of this type (2).
The purpose of this invention is to clearly indicate the operating status of the two transports and to clearly indicate mutually related operations for the convenience of the operator.

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 provided which is removably hinged with set screws 20.

Each transport section has various operation buttons.

The first transport section 12 has a recording (RFC) button 24;
It has a send back (RWD) button 26, a fast forward (FF) button 28, a play (PLAY) button 30, a stop (ST'OP) button 32, and a pause (PAUSE) button 34.

Similarly, the second transport section 14 also has the REC button 36, R
WD button 38, FF button 40, PLAY button 4゛2.5 TOP
It has a button 44 and a PAUSE button 46.

The deck 10 has various operating means and operating state monitoring means.

48, 50 and 52 are slide positioning tape level adjustment knobs, line input level adjustment knobs, 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 push-button switch type power switch 60 is provided on the front panel.

Additionally, the front panel is provided with a monitor input selector switch 62 in the form of a three-position switch and a monitor switch in the form of a two-position switch.

On the front panel of the deck 10, along with two level meters, there are a tape counter 66 related to the first transport, a counter reset button 68, a memory switch 70, a bias selection switch 72, and an equalizer selection switch 74. Tape counter 76, counter reset button 68, memory counter associated with the second transport
It has a switch 80, a bias changeover switch 82, and an equalizer changeover switch 84.

Also, 86 is a relay switch, and 88 is five light emitting dies.

A function display means consisting of an ode is shown.

Deck 10 has two operatively related tape transport sections 12 and 14 that can accomplish a variety of functions.

Each transport section can perform independent recording and playback modes.

. Again, it is possible to automatically perform recording and reproduction of other transport sections from recording and reproduction of one transport section.

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.

Note that it is actually a stereo configuration.

Reference numeral 100 indicates a recording/reproducing head associated with the first tape transport section 12, and reference numeral 102 indicates a recording/reproducing head associated with the second tape transport section 14.

Relay 104 has two switch circuits 106 and 108.

In the switch position shown, the relay indicates that the first tape transport section 12 is in recording mode and the second tape transport section 1 is in recording mode.
4 is connected so that it is in 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 transports is in the recording mode, the others are in the playback mode.

Energizing contacts of switch circuit 106 and switch circuit 108
The unenergized contacts of are provided to a mixing amplifier 112 via regenerative amplifiers 110 and 111, respectively.

The regenerative amplifier includes means for equalizing the regenerated signal.

Transistors 113 and 114 effectively ground each signal path when turned on.

The transistor 116 is mainly used for muting operation, and the reproduced signal passing through the removable jumper connection is connected to the first
Slides related to tape level adjustment knob 48 in the figure
It is applied to the volume 120 and also to the tape contact 124 of the switch 122 associated with the monitor input selector switch 62 of FIG.

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.
30 to a line output terminal 132, and simultaneously via a meter and headphone amplifier 134 to a headphone terminal 134 and a meter 136.

Meter 136 corresponds to level meters 56 and 58 in FIG.

Headphone terminal 134 corresponds to headphone jack 90 in FIG.

Microphone input from the microphone input terminal 138 corresponding to the microphone jack 92 in FIG. 1 is applied via a microphone amplifier 140 to a slide volume 142 corresponding to the microphone level adjustment knob 52 in FIG. It is applied to the microphone contact 144 of the input changeover switch 122.

The signal from line input terminal 146 is input to line amplifier 148.
The signal is applied to a slide volume 150 corresponding to the line input level adjustment knob 50 in FIG.

The signals from each volume 120, 142 and 150 are routed through a mixing amplifier 154 to the jumper connection 118 described above.
A jumper connection similar to 1560 is provided for the switch.

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 the first transport section 12
and to a recording intensifier 162 associated with the second transport section 14 .

On the input side of each recording amplifier is a transistor switch 1
64 and 165 are provided.

When these transistors 164, 165 are turned on, the inputs to their respective amplifiers are effectively grounded.

For example, a "Dolby" noise reduction device can be connected to jumper connections 118 and 156.

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 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.

An indirect connection configuration with the accessory switch 158 may be provided in the connection path 118.

In that case, the common contact is tape contact 124 (switch 12
2) Connect to.

Therefore, with this configuration, the monitor state can be changed only by operating a switch.

The monitor select switch 130 is an electronic switch, which includes a first switch 170 and a second switch 172.
It becomes more.

The first switch 170 is responsive to the RE (JO 24) of the first tape transport 12 and moves from the switch position shown to another position when pressed.

The second switch 172 is responsive to the REC[36 of the second tape transport 14, and when pressed moves from the illustrated switch position to another switch position.

That is, when one of the REC buttons is pressed, the switch 126 and the line output terminal 132 are connected, and therefore,
Recording monitoring or monitoring of each recording input (as determined by switch 122) is possible.

On the other hand, if neither REC button is pressed, switches 170 and 172 are in the positions shown, so that the playback output on connection path 118 is monitored and appears at playback output terminal 132.

The deck 10 incorporating the present invention, as described above, has the following features:
A first tape transport 12 and a second tape transport
Associated with each mode of operation of the transport 14 can be various coarsely aggregated or correlated modes of operation.

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 connected to the pLAY of the first transport 12.
It turns on in response to the operation of the button, FF button, and RWD button.

Similarly, the switch 306 connects the second transport 14 to P
It turns on according to the operation of the LAY button, FF button, and RWD button.

In each transport, as long as the reel stand is rotating, a positive voltage is produced at the outputs 301 and 303 of the detection means 300, 302, which causes transistors 308 and 3
10 turns 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 for each transport is released. Become.

Circuits 316 and 318 are timer start circuits for the first and second transport sections, respectively.

Each circuit has a timer start plunger 320
and 322.

Transistor 324 forms part of the first tape transport's timer start priority circuit.

Transistor 326 forms part of a priority circuit that gives priority to operations associated with the first tape transport in continuous recording and continuous playback modes.

Terminal 328 is provided with a relay (continuation) instruction signal, which will be described below in connection with FIG.

FIG. 4 shows the relay 104 and transistor 1 of FIG.
13, 114 and 164, 165 are shown.

Pressing the PLAY button associated with the first transport 12 turns off the normally closed (NC) type switch 400.

Therefore, transistor 402 which is normally kept off
turns on.

When the transistor 402 is turned on in this manner, the potential of the terminal 404 becomes the ground level.

Since the terminal 404 is connected to the base of the transistor 113 (FIG. 2) on the output side of the regenerative amplifier 110 associated with the first transport section, this change to ground level is normally turned on. Turn off transistor 113.

Opening switch 400 also increases the level of line 406 from ground to some positive level, thus turning on transistor 40B.

Therefore, the light emitting diode 410 lights up.

LED 4100 illumination indicates that first transport 12 is in play mode.

When the PLAY button of the second transport 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 switch 412 brings the level of line 418 to a positive potential, so transistor 420 turns on.
Therefore, the LED 422 emits light.

LED 4220 illumination indicates that the second transport is in play mode.

When the PLAY buttons of two transports are pressed at the same time, means is provided for giving priority to the 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.

Turn on the star 114.

As mentioned above, when transistor 402 is turned on for the regeneration mode of the first transport, line 42
6 is at ground level, so transistor 428 is turned off.

Therefore, after a delay of a predetermined amount (0.5 seconds) by the timer circuit 430, transistor 432 turns on, which energizes relay 104.

That is, relay switches 106 and 108 of FIG. 2 are reversed from their illustrated positions, and switch circuit 106 causes the first transport.

The associated head 100 is connected to the regenerative amplifier 110 side.

FIG. 4 shows a switch 434 a > 434 b > 43 that responds to the REC button of the first tape transport.
4c and 434d and a second tape) lance.

A switch 436a responsive to the RFC button of the port.

436b and 436c are shown.

The figure shows all of these switches in the off position, i.e. RFC
The button is shown unpressed.

The RFC button on the first tape transport is pressed (
The condition for setting the recording mode is that the PLAY button is pressed.

), switch 434a turns off transistor 402.

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 lightning 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 440 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 transistor 414 off.

This will give a positive voltage to terminal 416, so
Turn on muting transistor 114.

Furthermore, as a result of turning off transistor 420, LED4
22 stops emitting light.

Switch 436b removes the 10B voltage from terminal 442;
This turns muting transistor 165 off.

Switch 436C turns on light emitting diode 444.

This indicates that the second 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 provides a thousand volts to terminal 442.

This turns transistor 165 on.

Activation of switch 436c also bypasses the base bias voltage of transistor 428 to ground through diode 450.

This turns off transistor 428 and then turns on transistor 432, energizing relay 104.

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, a voltage of 10B is always applied to the base of transistor 4540.

This continuous mode of operation is only set when the first and second transports are commanded to play or record 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 relay switch 452 is turned on, a ten B voltage is applied to transistor 460 via LED 458.

In this state, the conditions for turning off the transistor 454 are that the transistors 402 and 414 are turned on at the same time;
That is, when the PLAY buttons of both transports are pressed, switches 400 and 412 are turned off, and when the REC buttons of both transports are pressed, switches 434d and 436c are turned off.
is switched and the line 462 is grounded via the diode 460.

At that time, terminals 456 and 328 are released from ground, so when the first tape transport auto-stops, this pulse signal turns on transistor 326 and turns on transistor 3 of the timer start circuit.
19 and energizes plunger 322 which releases the PAUSE button of the second tape transport.

The no-base bias condition of transistor 454 (FIG. 4) turns transistor 468 off.

As a result of this, transistor 460 turns on, which causes LED 458 to illuminate.

This indicates that the deck 10 is in continuous recording and continuous playback mode (relay mode).

FIG. 5 is a layout diagram of the relay switch 86 (452) and the function display means 88.

The function display means are LEDs 410 and 440 representing playback and recording associated with the first transport, and LEDs 410 and 440 representing playback and recording associated with the second transport.

It consists of LEDs 422, 444 and an LED 458 indicating the relay mode in which the relay switch is turned on.

Therefore, when dubbing to the second tape-transport, LEDs 410 and 444 will light up, and the dubbing from the second transport to the first tape-transport will occur.

LEI for dubbing to sport? 4'227i and 44
0 lights up.

For continuous playback, the relay switch is turned on and the LED
410, 458 and 422 are lit, and L is lit for continuous recording.
ED440, 45'8 and 444 are lit.

In addition to that, four displays of P', LAY, and REC are possible independently.

With the above structure, when recording, the playback LED
goes out.

Even when dubbing with u'-shift in both directions, the relay
Even when the switch is turned on, the relay mode indication LED does not light up.

This is because relay mode is always only provided when both transports are set to record or play.

The deck 10 is capable of continuous timer playback and continuous timer recording.

Set both transports to record or play, and press PAUS
If the E button is held down and the relay switch 452 is off, the first priority transport will start recording or playing at the first set time and it will automatically start recording or playing.
After stopping, the second tape transport initiates recording or playback 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, during reproduction, it is desirable to prevent the reproduction signal from being applied to the reproduction electric circuit for a predetermined period, 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, in FIG.
16 are provided.

However, muting by this transistor 116 alone is insufficient, and an excessive shock signal still passes through to the subsequent stage.

Therefore, the above-mentioned transistors 113 and 114 are used together for this muting, thereby providing a double muting function.

PLAY switch 400 and R associated with the state transition or first transport of the collector of transistor 402
The state transition of the base side potential of the transistor 4020 by the FC switch 434a is applied as a pulse signal to the transistor 4.
80 and turn it on.

Therefore, capacitor 482 is discharged.

Transistor 48'0 is turned off again and transistor 486 is turned off until capacitor 482 begins charging and its charging potential exceeds the Zener diode barrier voltage level.

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 connected to diodes 490 and 49.
2 to terminals 404 and 416, respectively, thereby also turning on transistors 113 and 114, respectively.

These muting transistors 116, 113,
The period during which the capacitor 114 is on depends on the charging/discharging time constant of the capacitor 482, but is usually set to 1 to 2 seconds.

Means is provided for providing a muting function when neither the PLAY button of the first or second transport is pressed.

This consists of transistor 494.

If neither PLAY button is pressed, switch 4
00 and 412 are on, so the base of transistor 4940 is not biased and is off.

Therefore, a positive voltage muting signal is applied to terminal 488.

By pressing any PLAY button, the transistor 49
4 is turned on, thereby removing the remuting voltage from terminal 488.

[Brief explanation of drawings]

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 function indicating means used in the circuit deck of FIGS. 1-3. In the figure, 410 and 440 are playback and recording instruction LEDs for the first tape transport, 422 and 444 are playback and recording instruction LEDs for the second tape transport, respectively, and 458 is a relay mode instruction LED. .

Claims (1)

[Claims] Twelve separately operable magnetic tape transports are housed in the same deck, with recording on the first transport and playback on the second transport and playback on the first transport and playback on the second transport. In an apparatus having a bidirectional dubbing means for selectively recording
means for respectively instructing recording and reproduction of the first transport; means for respectively instructing recording and reproduction of the second transport; and when both the first and second transports are instructed to record or reproduce; means for performing automatic sequential operation from recording of a first transport to recording of a second transport or from playing of the first transport to playing of the second transport; and the first and second transports. 2. A magnetic tape device comprising: means for operating said bidirectional dubbing means when one of the two is instructed to record and the other to play.