JPS6144264Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape recorder in which recording muting and pausing can be performed with a single switch.

In conventional tape recorders, a recording/mutating switch and a pause switch are provided separately.

This requires two switches, which increases the number of parts and, in some cases, requires both hands to operate.

The present invention eliminates the above drawbacks, reduces the number of parts by performing recording muting, pausing, and canceling them with a single switch,
The purpose is to provide a tape recorder with improved operability.

The present invention will be explained below with reference to examples.

FIG. 1 is a block diagram of one embodiment of the present invention.

In Figure 1, IN is the recording input terminal, 1 and 2 are the amplifiers, 3 is the variable resistor for adjusting the recording level, 4 is the recording amplifier, 5 is the recording magnetic head,
Reference numeral 6 indicates a magnetic tape, which constitutes an electric circuit of a recording line of a tape recorder. on the other hand,
A recording muting transistor 7 is connected between the input terminal of the recording amplifier 4 and the ground.

Further, 8 is a mechanism control circuit of the tape recorder, and when the mechanism control circuit 8 operates the recording switch of the tape recorder, the tape recorder is switched to the recording state, and the REC terminal generates a high potential output. Also,
When a low potential input is applied to the pause input terminal, the output from the pause output terminal puts the tape recorder in a pause state, and in the recording state it enters a recording standby state, but the REC terminal continues to generate a high potential output.

On the other hand, 9 is a switch (hereinafter simply referred to as a switch) that serves both as a recording mute and a pause, the common contact is grounded, the contact A is in the pause position,
Contact B corresponds to the off position, and contact C corresponds to the recording mute position. Contact A of the switch 9 is connected to the pause input terminal of the mechanism control circuit 8, and contact B is connected to the resistor R.
It is connected to contact C through a time constant circuit consisting of a parallel circuit of _A and capacitor C _A , and contact C is input to the inverter 10. On the other hand, the inverter 10 is connected to the power supply Vcc via a pull-up resistor _RB . The output of the inverter 10 is input to the AND gate 11 together with the output from the REC terminal of the mechanism control circuit 8. The output of the AND gate 11 is input to the integrating capacitor C _B through the diode D, and the output voltage of the capacitor C _B is applied to the base of the muting transistor 7 through the buffer amplifier 12. A high-resistance resistor _R2 that determines the discharge time constant of the capacitor C _B is connected to the diode D, and the output terminal of the AND gate 11 is connected to the power supply +Vcc through a low-resistance resistor _R1 .

In this embodiment configured as described above, when the contact B of the switch 9 is in contact with the movable piece, that is, when the OFF position is selected, the mechanism control circuit 8 is connected to the tape in one section in FIG. The recorder is in a recording state as shown in FIG. 2a, and the REC terminal of the mechanism control circuit 8 is generating a high potential output. Since the following explanation will be about the recording state, the REC terminal of the mechanism control circuit 8 is at a high potential output as shown in FIG. 2c. Furthermore, since the input of the inverter 10 is at a high potential, the inverter 10
The output is a low potential output as shown in FIG. 2b. Therefore, the output of the AND gate 11 is as shown in Fig. 2d.
When the voltage of the capacitor C _B is at a low potential as shown in FIG. 2, the output of the buffer amplifier 12 is also at a low potential as shown in FIG. 2e. Therefore, the transistor 7 is in an off state, and the recording amplifier 4 operates normally to generate an amplified output of the recording input waveform as shown in FIG. 2(f).

Next, when the switch 9 is switched from the contact B side to the contact A side, that is, from the OFF position to the pause position (second
) The pause input terminal of the mechanism control circuit 8 becomes a low potential, the pause output terminal of the mechanism control circuit 8 becomes a high potential, and the tape recorder is switched to a pause state, that is, tape running is stopped. Set to recording standby. In this state, the output of the inverter 10 is a low potential output as shown in Figure 2b, the REC terminal is a high potential output as shown in Figure 2c, and the output of the AND gate is as shown in Figure 2d. The output of the buffer amplifier 12 is a low potential output as shown in FIG. 2e, the transistor 7 is in an off state, and the recording amplifier 4 is outputting an output as shown in FIG. 2f. In the pause position, muting is not applied and remains in operation regardless of recording or playback status.

Next, when switch 9 is switched from contact A to contact B, that is, from the pause position to the off position (in the section from Fig. 2), the time constant of resistor R _A and capacitor C _A changes from the time the switch 9 goes to the off position. During T _{0 time} determined by
Only during the period , the output of the AND gate 11 becomes a high potential output as shown in FIG. 2d. This high potential output charges the capacitor C _B , but the period is short, and there is no change in the output of the buffer amplifier 12, and the transistor 7 remains in the off state during the period shown in FIG.
, is the same as . Next, when switch 9 is switched from contact B to contact C, that is, from the OFF position to the recording mute position, the section changes from the section shown in FIG. As shown in Figure 2b, a high potential output is obtained. Therefore, the output of the AND gate 11 becomes a high potential output as shown in FIG. 2d, and this output passes through the diode D and charges the capacitor C _B. In this case, since it is directly charged through the diode D, the voltage of the capacitor C _B rises quickly and there is little time delay, and the output of the buffer amplifier 12 becomes a high potential as shown in FIG. 2e, and the transistor 7 is turned off. The input terminal of the recording amplifier 4 is grounded, a mute is applied, and the input terminal of the recording amplifier 4 is grounded.
The input signal waveform is not amplified and output as the output, and in this case, the tape recorder runs the magnetic tape 6 in the same way as in the recording state, and it is possible to set intervals between songs. In this case, the explanation is about the recording state, and the REC terminal of the mechanism control circuit 8 generates a high potential output, but during the playback state, the mechanism control circuit 8 outputs a low potential from the REC terminal. Therefore, even if the switch 9 is set to the recording mute position, muting is not applied and the normal playback state is maintained. The above describes the case where the switches are taken sequentially from the pause position to the off position and then to the recording mute position. However, when switching from the pause position to the recording mute position, the switch also passes through the off position in the middle of the switch, and There is no change in its action, only the period in position is shortened, and it is the same as the section in FIG. 2, as indicated by XI. Note that here, the section corresponds to the section, the section corresponds to the section, and the section XI corresponds to the section.

Next, after applying the recording mute, switch 9
When the switch is set to the contact B side, that is, to the OFF position (from the section to the section in Figure 2), there is a delay of T ₁ determined by the time constant from the time when the switch 9 reaches the OFF position due to the time constant of the capacitor C _A and the resistor R _A. The input end of the inverter 10 becomes a high potential, and the output end of the inverter 10 becomes a low potential output after a time delay of _T1 , as shown in FIG. 2b. Therefore, the output terminal of the AND gate 11 also becomes a low potential output, as shown by the broken line in FIG. 2d, with a delay of time ^T1 from the time when the switch 9 is turned off. However, since the output terminal of the AND gate 11 becomes a low potential, the capacitor C _B discharges its charge through the resistor R ₂ , so the output voltage of the capacitor C _B becomes equal to the resistor R ₂ as shown by the solid line in FIG. 2d. It decreases according to the time constant due to capacitor _CB . When the output of the capacitor C _B becomes less than a predetermined value, the transistor 7 is turned off and the muting of the recording amplifier 4 is released. This means that the release of the recording mute is delayed compared to the operation of the tape recorder mechanism, but this is to prevent recording until the running of the magnetic tape becomes stable.

Next, when switching from the recording mute position to the pause position, the switch will pass through the off position on the way, and the switch will change from section to section to section as shown in Figure 2, but the movable piece of switch 9 will be in the off position. The time for recording is short, and the same effect as above occurs as shown in section , in Figure 2, but the time constant of the resistor R _A and the capacitor C _A , and the time constant of the resistor R ₂ and the capacitor C _B make the recording possible. It works like switching directly from Miyuto to Pause.
Note that the sections in FIG. 2 correspond to the sections, the sections correspond to the sections, and the sections correspond to the sections.

As explained above, according to the present invention, the pause operation switch and the recording mute operation switch can be switched using a single changeover switch, which not only makes it possible to reduce the number of parts, but also enables reliable operation with one hand. Recording standby and release, and recording mute operations are possible, and there is no need to use both hands, and the other hand can perform other operations, such as operating a record player, improving operability.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention;
The figure is a timing diagram for explaining the operation of one embodiment of the present invention. IN...Recording input terminal, 4...Recording amplifier, 5
...recording magnetic head, 6...magnetic tape, 7...
Transistor, 8... mechanism control circuit, 9... switch.

Claims (1)

[Scope of utility model registration request] A pause input signal causes the mechanism to pause,
In a tape recorder having a mechanism control circuit that outputs a recording signal only during a period when a recording command signal is input from the outside, and a muting switch that cuts off a signal to be recorded on a magnetic tape, a switch that outputs the pause input signal is provided. a switch having a first terminal, a second terminal for emitting a recording mute signal, and a third terminal for canceling recording mute between the first terminal and the second terminal; a first time constant circuit connected between a terminal and a second terminal, a gate circuit for performing an AND operation on the recording mute signal and the recording signal, and a capacitor for integrating the output of the gate circuit; a second time constant circuit comprising a one-way element connected between the capacitor and the gate circuit and forming a charging time constant circuit together with the capacitor, and a resistor forming a discharging time constant circuit together with the capacitor; A tape recorder characterized in that the muting switch is controlled by the terminal voltage of the capacitor.