JPS637702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display circuit for an automatic telephone answering device that effectively displays that the time allowed for recording a message on an answering tape has elapsed.

With an automatic telephone answering device, the owner can record a message on the answering tape in advance to convey to the caller, for example, ``I'm away at the moment, but I'll record it, so please tell me what you need to do.''
…” is recorded. An endless tape is used as the response tape, and the time during which messages can be recorded is determined, but sometimes the owner may continue recording without realizing that the recording time has elapsed. As a result, not only is the message recorded incompletely, but also the peep tone signal required for switching from the playback state to the recording state in the automatic answering state cannot be recorded.

If the present invention continues to record messages even after the time allowed for message recording has elapsed, the light emitting diode will blink to notify the owner that the message recording is incomplete, and the owner will not be able to notice this and will not be able to function. When the endless tape goes around with the switch in recording mode and the tape switch returns, the light-emitting diode is turned off to notify that the response tape has gone around, and when the function switch is turned off, the light-emitting diode blinks again. To provide a display circuit for an automatic telephone answering device, which allows the user to reconfirm that the recording of a message is incomplete.

The present invention will be described below with reference to the drawings. Reference numeral 1 denotes a tape recorder section, a magnetic head 3 for recording or reproducing messages on an endless response tape 2;
A microphone 4, an amplifier circuit 5 for recording the signal from the magnetic head 3 or the microphone 4, and a TR switch which is switched when a transistor relay (not shown) is excited by a peep tone signal reproduced from the response tape 2. 6a,
6b, function switches 7a, 7b, 7 that can be switched to a recording state different from that shown in the diagram only when pressed;
c. Conductive film 9 and electrodes 10, 1 on response tape 2
0 tape switch 11. The tape recorder section 1 is connected to a line transformer 13 via an LS relay 12. 14 is a starting circuit including an LS relay (not shown); 15 is a motor circuit for driving the response tape 2; 16 is a one-shot circuit connected to the function switch 7c via a differential circuit 17; A pulse signal having a pulse width sufficient to cause the conductive film 9 of 11 to escape between the electrodes 10, 10 is generated. 18
is a timer circuit consisting of a capacitor 19 and a resistor 20, which counts the time the response tape 2 is run until it is insufficient to record a peep tone signal. A voltage comparison circuit 21 compares the bleeder voltage of the resistors 22 and 22 with the voltage of the timer circuit 18, and its output is applied to the RS flip-flop 23. 24 is an unstable multivibrator whose operation is started by the output of the RS flip-flop 23; 25 is a display circuit comprising transistors 26, 27, 28 and a light emitting diode 29;
has. 30 is a NOR circuit to which a power supply voltage (+B) is supplied to one end and a high level signal is supplied to the other end via the function switch 7c; 31 is a transistor that is turned on by the output of the NOR circuit 30; The transistor 28 is forced off.

Next, the operation of the present invention will be explained. First, in order to record a message to the caller, the owner switches the function switches 7a, 7b and 7c to a state different from that shown. Then, the power supply voltage (+B) is applied to the one-shot circuit 16 via the function switch 7c and the differentiating circuit 17, and the one-shot circuit 16 generates a pulse signal. The pulse signal is applied to the motor circuit 15 to rotate the motor and cause the response tape 2 to run. The response tape 2 is run a little, the conductive film 9 escapes from between the electrodes 10, and the tape switch 11 is turned on. As a result, the power supply voltage (+B) is now supplied to the motor circuit 15 via the resistor 32, so that the motor continues to rotate even after the pulse signal disappears. Therefore, when the owner speaks a message to the caller into the microphone 4, the message is converted into an audio signal by the microphone 4, and is transmitted magnetically via the function switch 7a, the amplifier circuit 5, and the function switch 7b. head 3 and recorded on response tape 2. At this time, the power supply voltage (+B) is
6, the transistor 26 is turned on and the light emitting diode 29 emits light to indicate that a message is being recorded. Further, when the tape switch 11 is turned off and the recording state is entered, the power supply voltage is applied to the timer circuit 18 to count the recording time.

After the recording of the message is completed, when the pressing force is released and the function switches 7a, 7b, . . . are reset, a temporary oscillator (not shown) oscillates and a peep tone is recorded. After that, the response tape 2 goes around once, the tape switch 11 is turned on again, and the motor circuit 1 is turned on again.
The supply of power supply voltage to motor circuit 15 is stopped.
is made inoperative, the response tape 2 is stopped, and the message recording work is completed. Further, the transistor 26 is also turned off and the light emitting diode 29 is turned off. By returning the function switch 7c, the transistor 33 is turned on, causing the capacitor 19 to discharge the charge that had been charged up to that point, and resetting the timer circuit 18.

However, when the response tape 2 has run almost one round and continues recording without realizing that there is no longer enough room to record the peep tone signal, the charging voltage of the capacitor 19 of the timer circuit 18 becomes resistance 2.
2 and 22, the voltage is higher than that obtained by bleeding in the voltage comparator circuit 21.
The output of becomes high level, inverts the RS flip-flop 23, and outputs the astable multivibrator 24.
is operated, and its output turns on and off the transistor 28. Since the transistor 26 is turned off at this time, the light emitting diode 29 flashes every time the transistor 28 is turned on and off, indicating that recording is not possible. This state remains even after function switches 7a and 7b are reset.
This continues as long as the set state of the RS flip-flop 23 is maintained. On the other hand, light emitting diode 2
Without noticing that 9 is blinking, the function switch 7c continues to be turned on, and when the response tape 2 goes around once and the tape switch 11 is turned on, both input terminals of the NOR circuit 30 become low level. , the output of the NOR circuit 30 becomes high level, turning on the transistor 31. As a result, the transistor 28 is turned off, and the light emitting diode 29, which has been flashing, goes out, notifying the owner that the response tape 2 has completed one cycle and has stopped.
After that, the pressing force of the function switches 7a, 7b is released, and the function switches 7a, 7b are turned off.
When 7b is returned to the illustrated state, one input terminal of the NOR circuit 30, which has been at a low level, becomes a high level, so the output of the NOR circuit 30 becomes a low level, and the transistor 31 is turned off again. Therefore, each time the transistor 28 is turned on and off by the pulse signal from the unstable multivibrator 24, the light emitting diode 29 blinks, indicating that the message has not been completely recorded.

When the owner switches function switches 7a, 7b, and 7c to record a message again,
The recording state is entered in the same manner as described above, and at this time, the RS flip-flop 23 is reset by the pulse signal generated from the one-shot circuit 16, so the unstable multivibrator 24 stops oscillating, and the transistor 28 continues to operate. Turn off. When the recording of the message is completed and the function switches 7a and 7b are set to the state shown in the figure, the automatic response state is put on standby. In such a state, the calling signal issued by the calling party is transmitted via telephone lines L ₁ and L ₂ .
When added to the line transformer 13 and further supplied to the starting circuit 14 via the LS switch 12, the motor circuit 15 is started and the response tape 2 is run. At the same time, the LS relay is energized and the LS switch 12 is switched to a state different from that shown in the diagram, so that the message recorded on the response tape 2 is transferred to the magnetic head 3.
After being reproduced at
b, is supplied to the line transformer 13 via the TR switch 6b and the LS switch 12, and is connected to the telephone line L ₁ ,
It is transmitted to the caller via _L2 .

As described above, the display circuit of the automatic telephone answering device of the present invention flashes the display element to indicate this when the answering tape has run almost all the way around and it is no longer possible to record a message. If you continue to press the function switch without noticing, and the response tape goes around and stops, the display element will turn off to notify you of this, and if you return the function switch in that state, the display element will blink again, so you can hear the message. It is possible to reliably display that the recording was not completed.

[Brief explanation of the drawing]

The figure is a display circuit diagram of the automatic telephone answering device of the present invention. 1 ...tape recorder section, 2...response tape, 8
...Record switch, 11...Tape switch, 15...
Motor circuit, 16... One-shot circuit, 18... Timer circuit, 23... RS flip-flop, 25
...Display circuit, 30...Nor circuit.

Claims (1)

[Claims] 1. A timer circuit connected to a function switch and detecting the recording time for recording a message to be transmitted to a caller on an endless answering tape, a flip-flop connected to the timer circuit, and a non-contact circuit connected to the flip-flop. a stable multivibrator, a display element for displaying an operating state, a first transistor connected to the display element and controlled by the output of the tape switch or the flip-flop, and connected together with the first transistor to the display element; The timer circuit starts operating by switching the function switch to the recording state, while the tape switch turns on the first transistor. When the display element is turned on and recording continues after the recording time set by the timer circuit has elapsed, the flip-flop is inverted by the output of the timer circuit, and the first
1. A display circuit for an automatic telephone answering device, which turns off a transistor, operates an unstable multivibrator, and uses the output of the unstable multivibrator to turn on and off a second transistor to blink a display element.