JPS5836418B2 - Renzokukirokuseigiyosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for continuous recording using a limited number of recording media, and is applicable to tape recorders, VTRs, etc.
It is most suitable for use in etc.

Conventionally, when recording continuously for a long time using a tape recorder, etc., it was necessary to prepare two tape recorders and manually set the other tape recorder to recording mode when the tape on one tape recorder approached the end. I went there.

For this reason, the amount of tape must be monitored near the end, and the tape recorder must be operated depending on the results of the monitoring, which requires extremely troublesome effort.

The present invention was invented in view of the above-mentioned drawbacks, and it sets a second recording device to a recording state based on a detection signal from a recording medium before-end detection means provided in the first recording device. A control means for obtaining a control signal for and sending this control signal to the second recording device, and a detection signal from a before-end detection means for the recording medium provided in the second recording device. A continuous recording control device is provided with a control means for obtaining a control signal for setting a first recording device to a recording state and sending this control signal to the first recording device. This makes it possible to perform seamless continuous recording automatically and simultaneously using two recording devices for a predetermined period of time near the end of the recording medium.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

In the figure, 1 and 2 are tape recorders.

Since both devices have exactly the same circuit configuration, the correspondence with tape recorder 1 is indicated by consecutive terminal numbers, and the circuit of tape recorder 2 is omitted.

Reference numeral 3 denotes a recording control device, which can control the tape recorders 1 and 2 to a recording state as described later.

In the tape recorder 1, two types of power supply voltages 1B1 and 1B2 are obtained from the power supply 25.

+B1 is the power supply for amplifiers 12, 13, and 14, and 10B
2 is used to drive the bias oscillator 15, alarm oscillator 16, and relay 27.

Switches 5 to 10 are switched by a relay 27, and when the transistor 29 is turned on, the relay 27 is switched on.
When the switch is driven, the PB contact is switched to the REC contact to set the tape recorder in the recording state.

The resistors 17 and 18 and the capacitor 22 together with the amplifier 13 constitute an equalizer during reproduction, and are switched and used by the switch 7.

Reference numeral 4 denotes a recording/reproducing head, which is switched and used by switches 5 and 6.

The resistor 19 and capacitor 23 connected in parallel are used as an equalizer during recording, and are switched by the switch 8. When the switches 5 to 10 are closed to the REC side and the tape recorder 1 is in the recording state, the input terminal 11 is connected. An applied audio signal from, for example, a microphone is supplied to the recording/reproducing head 4 via an equalizer consisting of an amplifier 12, an amplifier 13, a resistor 19, and a capacitor 23.

At this time, by closing the switch 10 to the REC side, the 10B2 voltage is also supplied to the bias oscillator 15, so
A bias current is supplied from this bias oscillator 15 to the recording/reproducing head 4.

Further, the alarm oscillator 16 oscillates when it detects the end or before-end, and supplies its output to the speaker 26 via the switch 9 to issue an alarm.

When the switches 5 to 10 are closed to the PB side and the tape recorder 1 is in the playback state, the playback signal obtained by the head 4 is amplified by the amplifiers 12, 13, and 14. It is supplied to the subaker 26.

The switches 5 to 10 described above are switched by a relay 27, and the relay 27 is driven and controlled by turning a transistor 29 on and off.

The transistor 29 is turned on when a positive pulsed remote control signal is applied to the remote control terminal 47 and this pulse is supplied to the base of the transistor 29 via the resistor 21.

At this time, current from the 10B2 power supply flows through the relay 27 and the transistor 29 that is in the on state, and the relay 2
7 switches the switches 5 to 10 to the REC side.

Note that the diode 28 is for discharging the back electromotive force generated in the relay 27.

Transistor 29 is turned on, and IJ I-. -2
7 is driven and the switches 5 to 10 are switched to the REC side, the
Since a positive voltage from the power supply is supplied to the base of the transistor 29, the transistor 29 is maintained in the on state even when the pulse applied to the terminal 47 is no longer present, and the relay 27 is self-maintained.

The control circuit 130 of the recording control device 3 connects to this remote control terminal 47 (terminal 48 in the case of the tape recorder 2).
] The tape recorders 1 and 2 are controlled by supplying remote control signals to the recorders 1 and 2.

Next, this control circuit 130 will be explained.

The control circuit 130 is composed of two circuits having the same function.

Two switching transistors 96 and 97 are resistors 69
are connected by.

That is, the collector of transistor 96 and the transistor 97
The bases of are coupled through a resistor 69.

The emitter of transistor 96 and the base of transistor 97 are connected by a waveform shaping capacitor 85, and the emitter of transistor 96 is grounded.

Biasing resistors 67 and 68 are connected to the base and collector of the transistor 96, respectively.
A bias resistor 70 is connected to the collector of the tape recorder 1 through the respective resistors 67, 68, and 70.
10B2 power supply voltage is supplied from

The base of the transistor 96 is a reverse current prevention diode 10.
8 to the before-end detection reed switch 30 of the tape recorder 1.

One end of the on/off switch 53 is connected to the emitter of the transistor 97, and the other end is connected to the terminal 48 of the tape recorder 2 via the terminal 127.

Furthermore, two switching transistors 98, 99 are coupled by a resistor 72.

That is, the collector of transistor 99 and the transistor 98
The bases of the resistor 72 are connected to each other by a resistor 72.

The emitter of the transistor 99 and the base of the transistor 98 are connected by a waveform shaping capacitor 86,
The emitter side of transistor 99 is grounded.

Biasing resistors 74 and 73 are connected to the base and collector of the transistor 99, respectively.
A bias resistor 71 is connected to the collector of the tape recorder 2 through the respective resistors 74, 73, and 71.
It is supplied with 10B2 power supply voltage.

The base of the transistor 99 is a reverse current prevention diode 10.
9, the reed switch 3 of the tape recorder 2
It is connected to a before-end detection reed switch (not shown) similar to 0.

on. One end of the off switch 52 is connected to the emitter of the transistor 98, and the other end is connected to the terminal 47 of the tape recorder 1 via the terminal 128.

The reed switch 30 is repeatedly turned on and off when approaching the end of the tape, and is operated by a known before-or-end detection means.

Various types of before-end detection means are known, and for example, the following can be used.

The rotation speed of the supply reel increases as it nears the end of the tape, so the rotation of this supply reel is mechanically compared and detected by a slip mechanism with the rotation of a capstan, which is rotating at a constant speed, and the difference is determined to be greater than a predetermined value. It is determined that the reed switch 30 is turned on and off by a magnet.

Alternatively, the before-end may be detected by electrically detecting the rotational speed of the reel stand and determining that this detection signal exceeds a predetermined level.

When the reed switch 30 is first turned on by the magnet described above, the tape recorder 2 can be released into the recording state, and the operation at this time will be described next.

When the reed switch 30 is turned on, the base of the transistor 96 is grounded via the diode 108 and the reed switch 30.

By grounding the base, transistor 96 is turned off, and the base of transistor 97, which is connected to the collector of transistor 96 via resistor 69, has a positive potential sufficient to turn transistor 97 on.

When the transistor 97 is turned on, a positive voltage from the B2 power source of the tape recorder 1 is supplied to the switch 53 via the resistor 70 and the transistor 97.

The switch 53 is interlocked with the switch 52, and both are switches for selecting whether or not to perform continuous recording.

When this switch 53 is closed, the positive voltage supplied to the switch 53 described above is transferred from the terminal 127 to the terminal 4.
8.

Since the terminal 48 of the tape recorder 2 corresponds to the terminal 47 of the tape recorder 1, the tape recorder 2 enters the recording state by applying a positive voltage to the terminal 48.

Furthermore, since the tape recorder 2 has exactly the same functions as the tape recorder 1, by detecting the before-end with the tape recorder 2, it can be brought into a recording state with the tape recorder 1.

That is, when the terminal 44 of the tape recorder 2 becomes the ground potential, the transistor 99 is turned off. This turns the transistor 98 on, and the positive voltage from the 10B2 power supply of the tape recorder 2 supplied from the terminal 42 is applied to the resistance. Since the signal is supplied to the terminal 47 via the transistor 71, the transistor 98, the switch 52, and the terminal 128, the tape recorder 1 enters the recording state as described above.

Therefore, the recording control device 3 can put the other tape recorder into the recording state by detecting the before-end of one tape recorder.

After a pulse is applied to the terminals 47 and 48 from each before-end detection means of the tape recorders 1 and 2, the relay 27 is self-held as described above, so that recording can be continued.

Next, the monitor circuit 131 will be explained.

The terminal 37 is supplied with the output of the amplifier 13 of the tape recorder 1, that is, the audio signal during recording and playback.

This audio signal is applied from terminal 37 to the base of transistor 93 via terminal 118 and coupling capacitor 80.

Here, the transistor 93 and the bias resistors 60 and 61
．． The purpose of the amplifier 62 is to convert the impedance in order to supply the audio signal to the transformer 104.

The audio signal obtained from the emitter of transistor 93 is supplied to transformer 104 via coupling capacitor 81.
After being boosted here, it is sent to the earphone jack 103.

The transistor 92, the resistor 59, and the capacitor 79 constitute a ripple filter for removing ripple components of the 1B2 power supply supplied from the tape recorder 1.

Therefore, the amplifier constituted by the transistor 93 has the following characteristics:
This transistor 92 supplies a power supply voltage from which ripple components have been removed.

Like the alarm oscillator 16 of the tape recorder 1 described above, the alarm oscillator 101 oscillates when the before-or-end or end of the tape is detected, and its output is supplied to the pace of the transistor 93 via the coupling capacitor 80.

A similar circuit includes transistors 94, 95 and bias resistor 6.
3, 64, 65, capacitors 82, 83, 84, alarm oscillator 102, etc., and the tape recorder 2
The monitor audio signal from the tape recorder 2 is sent to the earphone jack 103 via the terminals 38 and 117.

A switch 51 that closes when an earphone plug is inserted is juxtaposed to the earphone jack 103.

When the switch 51 is closed, the 10B2 power supply voltage of the tape recorders 1 and 2, which is supplied to the switch 51 via the diodes 106 and 107, respectively, is supplied to the base of the transistor 90 via the resistor 57.

This turns on transistor 90, muting the output of alarm oscillator 16 connected to the collector of transistor 90.

Note that the capacitor 77 is a capacitor for waveform shaping.

At this time, the transistor 91 is also turned on to mute the output of the alarm oscillator (not shown) of the tape recorder 2.

Therefore, even if the tape recorder 1 reaches the end of the tape and the alarm oscillator 16 oscillates, the output is muted, so no alarm sound is emitted from the speaker 26.

However, since the alarm oscillator 101 oscillates, an alarm sound can be obtained from the monitor earphone inserted into the earphone jack 103.

If the monitor circuit described above is used as it is, it cannot be determined whether the tape recorder 1 or 2 is in a state of generating an alarm sound.

Therefore, a lamp or the like may be turned on by the before-end or end detection signal.

Next, the display circuit 131 will be explained.

This display circuit 131 includes transistors 88, 89 and a resistor 5.
4, 55, 56, a capacitor 76, a lamp 100, and a switch 50.

The emitter of the transistor 88 is grounded via terminals 114 and 35, and the collector is connected to the resistor 54 and the lamp 100.
The terminal 112 is connected to the terminal 112 via the terminal 112.

Transistor 88 is for controlling the current flowing through lamp 100.

Transistor 89 has its emitter connected to the base of transistor 88, and its collector connected to resistor 55 and switch 50.
The terminal 112 is connected to the terminal 112 via the terminal 112.

This transistor 89 is for controlling the base current of the transistor 88 connected to its emitter.

The base of the transistor 89 is the waveform shaping capacitor 76
is grounded together with the emitter of transistor 88 via
It is also connected to the terminal 111 via the resistor 56.

The terminal 112 is supplied with the 10B2 power supply voltage of the tape recorder 1, and the terminal 111 is supplied with the 10B2 power supply voltage of the tape recorder 2.

The switch 50 is interlocked with the aforementioned switches 52.53, and when the switch 52.53 is turned on, the switch 50 is also turned on.

When the switch 50 is closed, the voltage supplied to the terminal 112 is reduced by the resistor 54 of the lamp 100 and applied to the collector of the transistor 88. At the same time, the voltage supplied to the terminal 112 is reduced by the resistor 55 via the switch 50 and applied to the collector of the transistor 89. It is also supplied to the collector.

A positive voltage is supplied to the base of transistor 89 from terminal 111 through resistor 56, which turns transistor 89 on due to the voltage developed across capacitor 76.

When the transistor 89 is turned on, sufficient current is supplied to the base of the transistor 88 to turn the transistor 88 on.
is also turned on.

When the transistor 88 is turned on, current flows through the resistor 54 and the transistor 88 to the lamp 100, and the lamp 100 is turned on.

In order for the lamp 100 to turn on, the above three conditions must be met: the 10B2 power supply voltage of the tape recorder 1 is supplied to the terminal 112, the 10B2 power supply voltage of the tape recorder 2 is supplied to the terminal 111, and the switch 50 is closed. This is only possible if these three conditions are met.

When two B2 supply voltages are applied and switch 50 is opened, transistors 88 and 89 are not turned on.

Therefore, the lamp 100 is not lit.

That is, if the 10B2 power supply voltage of the tape recorder 1 is not supplied to the terminal 112, this means that the electric power 73S that can turn on the lamp 100 is not supplied, and at the same time, the transistor 88 cannot be turned on, so the lamp 100 cannot be turned on. Cannot conduct current.

Further, when the switch 50 is opened, or when the 10B2 power supply voltage of the tape recorder 2 is not supplied to the terminal 111, this means that the transistor 88 cannot be turned on.

Therefore, by this lamp 100, the tape recorders 1 and 2 and the recording control device 3 are in a predetermined state, that is, the tape recorders 1 and 2 are turned on, and the tape recorders 1 and 2 are connected to their terminals 33, 35, 37, 4143, 45. .47, 34, 36, 38, 42, 44, 46, 48 are connected to the recording control device 3 through connectors for connecting them to the terminals 113 to 128 of the recording control device 3, respectively.
and 111, and switches 52 .
This can indicate a state in which the switch 50 interlocked with the switch 53 is turned on and continuous recording is possible.

As described above, according to the present invention, based on the detection signal from the recording medium before-end detection means provided in the first recording device,
A control means for obtaining a control signal for setting a second recording device to a recording state and sending this control signal to the second recording device, and before-end detection of a recording medium provided in the second recording device. Based on the detection signal from the means, the first
obtain a control signal for setting the recording device to the recording state,
Since a control means for sending this control signal to the first recording device is provided, it is possible to automatically and seamlessly record by two recording devices at the same time for a predetermined time near the end of the recording medium. Continuous recording is possible.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. In addition, in the symbols used in the drawings, 1 and 2 are tape recorders, 3 is a recording control device, 30 is a reed switch, and 66
, 67, 68.69 is the resistance.

Claims (1)

[Claims] 1 Based on the detection signal from the before-end detection means of the recording medium provided in the first recording device, a control signal for setting the second recording device to the recording state is obtained, and this control signal is applied to the second recording device. a control means for sending the second
A control signal for setting the first recording device to a recording state is obtained based on a detection signal from a recording medium before-end detection means provided in the recording device, and this control signal is transmitted to the first recording device. What is claimed is: 1. A continuous recording control device characterized by comprising a control means for sending.