JPS601692B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and the object thereof is to perform a recording mute operation for creating a free part on a magnetic tape by using a recording switch without providing a special switch. The goal is to make it possible.

In recent years, many devices have come on the market that are equipped with so-called automatic cueing functions, which detect the no-signal portions between adjacent recording sections on a magnetic tape and can visually select the desired track for playback. It has become.

Some devices of this type are equipped with an operation switch called a recording mute button so that users can create the above-mentioned no-signal areas.As long as this button is pressed during recording, the recording signal is muted, and the no-signal areas are muted. There are some that are configured so that you can create them. An example of this device is shown in FIG. In Fig. 1, a recording signal from a microphone or the like supplied to the recording signal input terminal 1 is amplified by the lineup 2 and sent to the recording monitor output terminal 3, and if an earphone or the like is connected to this terminal 3, the recording signal is output. can be monitored. The output of the line amplifier 2 is supplied via a resistor 4 to a recording amplifier 5, and the output of the recording amplifier 5 is grounded via a recording head 6. The recording amplifier 5 consists of an amplifier 7, a bias oscillator 8, and a bias switch 9 that turns on and off the bias oscillator 8.
is closed during recording to operate the bias oscillator 8 by interlocking with a recording nail (not shown). On the other hand, 10 is a muting transistor, the outer emitter of this transistor is grounded, the collector is connected to the input device of the recording amplifier 5, and the base is connected from the resistor 11 to the power supply 13 via the recording mute switch 12. There is.

In this configuration, if the recording mute switch 12 is closed while the tape is running and recording, the recording signal is muted at the input of the recording amplifier 5 while the switch 12 is closed, so that no sound is recorded on the magnetic tape. It is possible to create a no-signal area.

However, this type of device requires a special recording mute switch, which poses problems in terms of cost and space.

The present invention solves these conventional problems,
By using the recording mute switch as a recording switch for recording operations, improvements in cost and space can be achieved.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, the same components as those in FIG. 1 are given the same numbers and their explanations will be omitted. A play command input terminal 15 of the control circuit 14 includes a play command storage circuit 14 a that stores play commands and a recording command storage circuit 14 b that stores play commands.
It is connected to a power supply 17 via a power source 17, and is grounded via a play switch 18, which is a normal, non-locking type. A stop command input terminal 19 of the control circuit 14 is connected to a power source 17 via a resistor 20, and is also grounded via a stop switch 21 of a normal contact type and non-locking type. Further, the recording command input terminal 22 of the control circuit 14 is connected to the power supply 17 via a resistor 23, and is also connected to the collector of a transistor 25 via a regular and non-locking type recording switch 24. The emitter of this transistor 25 is grounded. Further, the playback command storage output terminal 26 of the control circuit 14 is connected to the base of the transistor 25 via a resistor 27 and also to the plunger drive circuit 28, and the recording command storage output terminal 29 is connected to the plunger drive circuit 28. A recording command storage output terminal 29 is also connected to the plunger drive circuit 28. The plunger drive circuit described above drives two plungers. That is, the first plunger 30 moves the head substrate 31 forward against the force of a return spring (not shown) by its operation, brings the heads 32 and 33 attached thereon into contact with the magnetic tape 34, and also causes the pinch roller to move forward. 35 is brought into pressure contact with the capstan 36 via the tape 34, and the tape is run at a constant distance. Further, the second plunger 37 is operated to switch the recording/playback changeover switch 38 to the recording side, that is, to short-circuit the common contact C and the recording contact R, thereby making the recording circuit system operable.

Note that when the second plunger 37 is not operating, the recording/playback switching switch 38 has a movable piece returned to its original position by the force of a spring (not shown), and the playback side, that is, the common contact C and the playback contact P are short-circuited, and the playback circuit is closed. The system becomes operational. Next, the emitter of the transistor 39 is grounded, the base is connected to the collector of the transistor 25 via a resistor 40, and the outside of the collector is connected to the base of a transistor 42 via a resistor 41. transistor 4
The emitter of 2 is connected to the power supply 17, and the base is connected to the resistor 43.
The collector is connected to the base of the transistor 10 via the resistor 11. Note that the input terminals 15, 19, 22 of the control circuit 14
is when the input voltage is at L level (grounded),
The state is memorized and the output terminal is set from H level (approximately the same potential as the voltage of power supply 17) to L level.

The level state of the output terminal 26 in each input state is shown in the table below. In the above embodiment, in the stopped state, the output terminal 26
Since is day, the transistor 25 is in a conductive state,
When the recording switch 24 is closed in this state, the recording plunger 37, which is the second plunger, performs a suction operation, and the recording circuit becomes operational.

At this time, even if the recording switch 24 is opened, the recordable state is maintained by the memory output of the control circuit 14.
Furthermore, when the playback switch 18 is closed in this state, the magnetic tape 34 runs at a constant speed due to the suction operation of the first plunger 30, a recording signal is recorded on the tape, and the output terminal 26 becomes L, and the transistor 25 becomes non-conductive. Therefore, if the recording switch 24 is further closed in this state, the base current of the transistor 39 will be increased from the power supply 17.
The signal is supplied through the resistor 23, the recording switch 24, and the resistor 40, and the transistor 39 is conductive only while the recording switch 24 is closed. Along with this, transistor 4
2 becomes conductive, and muting transistor 1
0 is the conductive state, and only the input signal of the recording amplifier 5 is muted. In this manner, by operating the recording switch 24 during recording, the recording signal can be muted, and a no-signal portion of an arbitrary length of time can be created on the magnetic tape 34. As explained above, according to the magnetic recording and reproducing device of the present invention, since the recording switch can also perform the recording muting operation, it is possible to eliminate the recording muting switch that was provided separately for the sub-chamber, thereby reducing costs. It is possible to achieve great practical effects, such as being able to achieve this goal and effectively utilizing the space on the operation panel.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a main part of a conventional magnetic recording and reproducing apparatus, and FIG. 2 is a circuit diagram of a main part of a magnetic recording and reproducing apparatus according to an embodiment of the present invention. 1... Recording signal input terminal, 5... Recording amplifier, 10
...Muting transistors, 14a, 14b...
Memory circuit, 18... playback switch, 24... recording switch, 30, 37... plunger. Figure 1 Figure 2

Claims (1)

[Claims] 1 The playback switch and the recording switch are composed of normally open type switches, and a playback command storage circuit that stores the playback commands generated by operating the playback switch and a recording command storage circuit that stores the recording commands generated by the operation of the recording switch are provided. In response to the operation of the switch, the reproduction command is stored in the reproduction command storage circuit, the tape is made to run at a constant speed, and the reproduction circuit is put into operation via the changeover switch, and the recording command is stored in the reproduction command storage circuit in response to the operation of the recording switch. The recording circuit is configured to store a recording command in the storage circuit and drive the changeover switch to put the recording circuit into an operating state, and simultaneously operate a playback switch and a recording switch to memorize each command and at the same time run the tape for recording. In the magnetic recording/reproducing device, when the recording switch is operated for the first time and the recording circuit is in an operating state, the recording circuit is operated for a period of time when the recording switch is operated for the second time, and muting the recording signal. A magnetic recording/reproducing device equipped with a recording/mutating circuit.