JPS6059645B2 - 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 dubbing X has a master tape, a slave tape, and a transport. Among the various operating modes, the most distinctive feature is the selection of the program played by the master transport. In addition to these functions, the present invention also provides a means for making the muting operation more reliable during playback. Dual cassette stereo deck shown.

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 (REC) button 24, a remand (RW) button 24,
D) Button 26, Fast forward (FF) button 28, PLAY
) button 30, STOP button 32, PAUS
E) It has a button 34. Similarly, the second transport section 14 also has a REC button 36, RWD button 38, FF button 40, P
It has a LAY 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 two position monitor switch are provided. On the front panel of deck 10, along with two level meters,
Tape counter 66 associated with the first transport
, counter reset button 68, memory switch 70,
It has a bias selection switch 72 and an equalizer selection switch 74, a tape counter 76 related to the second transport, a counter reset button 78, a memory switch 80, a bias selection switch 82, and an equalizer selection switch 84. . Further, 86 indicates a relay switch, 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 unit can execute independent recording and playback modes. Furthermore, recording and playback of one transport section can automatically record and play back other transport sections. Dubbing related to mutual transport parts can be performed in a simple manner. Figure 2 shows deck 1 shown in Figure 1.
0 is a schematic diagram of the operating circuit of 0.

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 of the transports is in the recording mode, the others are in the reproduction 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 regeneration amplifier includes means for equalizing the regenerated mass. 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 the slide polymer 120 associated with the tape level adjustment knob 48 of FIG. 1, and the tape contact of the switch 122 associated with the monitor input selector switch 62 of FIG. 124. The playback signal passing through this switch 122 is monitored as shown in Fig. 1.
Source contact 1 of switch 126 corresponding to switch 64
28 and re-monitor ● select ● switch 13
0 to line output terminal 132 and simultaneously via meter and headphone amplifier 134 to headphone terminal 134 and meter 136. meter 136
correspond to level meters 56 and 58 in FIG. The headphone terminal 134 is the headphone jack 90 in FIG.
corresponds to The microphone input from the microphone input terminal 138 corresponding to the microphone jack 92 in FIG. 1 is applied to the slide volume 142 corresponding to the microphone level adjustment knob 52 in FIG. Microphone contact 144 of input selector switch 122
given to.

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 signal from each polymer 120, 142 and 150 is 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 a recording amplifier 16 associated with the second transport section 14 .
Connected to 2. 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, for example, be connected to a 1 dolbye 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.
The connection path 118 may be provided with a connection configuration that is in contact with the accessory switch 158 . In that case, the common contact connects to tape contact 124 (switch 122). Therefore, with this configuration, the monitoring state can be changed only by operating the switch. Monitor ◆ The select switch 130 is an electronic switch and consists of a first switch 170 and a second switch 172.

The first switch 170 is responsive to the REC button 24 of the first tape transport 12 and moves from the illustrated switch position to other positions when pressed. Second switch 17
2 is the second tape●REC button 36 of Transboat 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, as described above, can be used in various combined or interrelated modes in connection with each of the modes of operation of the first tape transport 12 and the second (7) tape transport 14. It is possible to take a prescribed operating mode.

Figures 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. It becomes like this. Circuits 316 and 318 are timer circuits for the first and second transport sections, respectively.
This is the start circuit. 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 3
Reference numeral 26 constitutes a part of a priority circuit that gives priority to operations related to 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 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 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. The transistor 113 that is present is turned off. Opening switch 400 also increases the level of line 406 from ground to some positive level, thus turning on transistor 408. Therefore, the light emitting diode 410 lights up. The illumination of LED 4lO indicates that the first transport 12 is in playback mode. When the PLAY button on the second transformer boat 14 is pressed, the 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 4-16.
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. Illumination of LED 422 indicates that the second transport is in playback 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 114 is turned on. As mentioned above, when transistor 402 is turned on for the regeneration mode of the first transport, line 4
26 is at ground level, so transistor 428
is off.

Therefore, after a delay of a predetermined amount (4) 5 seconds by time constant circuit 430, transistor 432 turns on, which energizes relay 104. That is, the relay switches 106 and 108 of FIG. 2 are reversed from the illustrated position and are moved up to the switch circuit 106, and the head 100 associated with the first transport is connected to the regenerative amplifier 110 side. 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. has been done.

In the figure, all of these switches are in the off position, ie. R.E.
The C button is shown not being pressed. 1st tape●
When the REC button of the transport is pressed (setting the recording mode requires that the PLAY button is pressed), the switch 434a turns off the transistor 402. This turns on the transmitting 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 results in a positive voltage being applied to terminal 416. Muting turns on transistor 114. Additionally, it turns off transistor 420, resulting in
The LED 422 stops emitting light. Switch 436b removes the +B voltage from terminal 422, 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 gives priority to the first tape transport and puts 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 changes 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. The deck 10 according to the embodiment of the present invention is capable of continuous recording and continuous playback. For this purpose, the relay shown in Fig.
A relay switch 452 corresponding to switch 86 is provided. This switch is shown in the off position in the figure. That is, in this off position, the +B voltage is always applied to the base of transistor 454. This continuous operation mode is set only when the first and second transports are commanded to play or record simultaneously. transistor 4
When 54 is turned on, terminal 328 of FIG. 3 connected to terminal 456 is grounded. This indicates that transistor 326 of FIG. 3 will not turn on. When relay switch 452 is turned on, a +B voltage is applied to transistor 460 via LED 458. In this state,
The condition for transistor 454 to turn off is transistor 4
02 and 414 are on at the same time, that is, the PLAY buttons of both transports are pressed and the switches 400 and 41 are turned on.
2 is turned off, and the other is when the REC buttons of both transformers are pressed, switches 434d and 436c are switched, and line 462 is grounded via diode 450. At that time, terminals 456 and 328 are released from ground, so when the first tape transport auto-stops, this pulse signal is transferred to transistor 3.
At the same time, the transistor 319 of the timer ◆ start circuit is turned on, and the plunger 322 is energized to release 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, 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, the first
The LEDs 41O and 444 are lit when the tape ◆transport is being copied to the second tape transport, and the LEDs 422 and 440 are lit when the tape is being copied from the second transport to the first transport. For continuous playback, the relay switch is turned on and LED4
IO, 458 and 422 are lit, and LE is lit for continuous recording.
D44O, 458 and 444 are lit. Besides 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 does not light up even if the relay switch is turned on. This is because 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, 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, 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, muting by transistor 116 alone is insufficient and excessive shock signals 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. PLA associated with the state transition or first transport of the collector of transistor 402
The state transition of the base voltage of the transistor 402 by the Y switch 400 and the REC switch 434a is applied as a pulse signal to the 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 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 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 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 PLAY button turns on transistor 494, which removes the switching 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 function indicating means used in the deck of the circuit of FIGS. 1-3. In the figure, 113,1
14 and 116 are transistors, and 482 is a capacitor.

Claims (1)

[Claims] 1. In a magnetic tape device containing two separately operable magnetic tape transports in the same deck, a playback signal that is selectively and alternately played from a first or a second tape transport. means for receiving the signals in separate reproduction equalization circuits and combining the outputs of the circuits, means for grounding the respective equivalent circuit outputs in accordance with a control signal, and means for receiving the combined outputs in accordance with a control signal. Muting device comprising means for grounding and means for supplying said control signal for a predetermined period of time upon transition of the operating mode of the first and/or second transport.