JPS62151A - Automatic answering telephone set - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution by employing an oscillator built-in a remote control detecting circuit used for controlling an answering telephone set also as a beep-tone generating oscillator signaling the state of the automatic answering telephone set. CONSTITUTION:An oscillating signal generated by the PLL circuit 14 of the remote control detecting circuit 12 is emitted from a speaker SP through a buffer 17 and a switch 8 when a remote control signal does not arrive, simultaneously is transmitted to a telephone circuit 2 from a line transformer LT, and recorded on a responding tape T1 or a receiving tape T2 by controlling switches S1-S6 by means of a microcomputer CPU. The switch 8 is controlled in on or off according to the program of the microcomputer CPU when a TAM is set in the prescribed action mode. The means for generating a beep-tone employs the oscillating part of the PLL circuit 14 of the remote control detecting circuit 12, and therefore the circuit constitution can be simplified.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a beep tone (
The present invention relates to an answering machine in which an oscillator for warning signals (warning signals) is also used as an oscillator for controlling the answering machine with a remote control signal received from the outside via a telephone line.

[Background of the Invention] A conventional answering machine has a configuration as shown in FIG.

i.e. of the caller? When a call from Ilf1fi11 arrives via telephone line 2, a bell signal appears between terminals 3a and 3b. This bell signal is detected by a bell signal detection circuit 4, and the detection signal is provided to a system control microcomputer (hereinafter referred to as microcomputer) CPU. As a result, the microcomputer CPU counts the detection signal a preset number of times. Therefore, the microcomputer CPU outputs an output that turns on the transistor Q, thereby turning on the relay 5. Then, the relay contact 5a of the relay 5 is closed to connect the telephone line 2 and an answering machine (hereinafter referred to as TAM).

After that, the microcomputer CPU drives the response tape T1 on which the response message has been recorded in advance, and switches S.
1. Turn on S2.8B. As a result, the response tape T
The response message recorded in 1 is transmitted from the playback head 6 to switch S1 → switch S6 → preamplifier 7 → buffer amplifier 8, and then switch S2 → band limiting filter 9.
→The signal is sent to the telephone line 2 via the line amplifier 10 and the line transformer LT, respectively. When the response message ends and the marker signal of the response tape T1 is detected, the microcomputer CPLI stops driving the response tape T1. In addition, the microcomputer CPU has been turned on by the switch S.
+1Sz, turn off Sg and switch 83.84
,S! on to control the recording of incoming messages.

That is, a message for reception is introduced from the caller's telephone 1 and applied to the primary side of the line transformer LT through the telephone line 2. Then, the receiving message is recorded on the receiving tape T2 from the recording head 11 via the secondary side of the line transformer LT via the switch S3, the preamplifier 7, the buffer 7, the amplifier 8, the switch 5, and the switch 4.

When the caller hooks on the telephone 1, the microcomputer cPU reads the change in level that occurs at this time, stops running the receiving tape T2, and prepares for the next call.

By the way, when a TAM user who is away from home wishes to listen to the contents of a received message from his/her location, he/she first calls the telephone number where the TAM is installed. Therefore, when the TAM responds to the bell signal and operates the remote control transmitter from the telephone 1 while the response tape T1 is playing the response message, a remote control signal appears on the secondary side of the line transformer LT.
The remote control detection circuit 12 identifies only the remote control signal from the response message and inputs it to the microcomputer CPU.

Here, the remote control detection circuit 12 is a so-called interface circuit for reading the command transmitted when the remote control is operated.

That is, the remote control signal applied to the secondary side of the line transformer LT is passed through a 2KH2 bandpass filter 13, for example.
Only the remote control signal is allowed to pass through. This signal is input to a PLL (phase locking) circuit 14 that follows the phase of the input signal. Then, the phase comparator compares the free running frequency of vCo in the PLL circuit 14 determined by resistors R1, R2, R3 and capacitor C1 with the phase of the remote control signal appearing through the bandpass filter 13. The compared signals are input to a low-pass filter determined by capacitors C2 and C3, and only (remote control signal) - (free-running frequency) is passed. At this time, the capacitor C3 also determines the detection bandwidth, and the capacitor C2 prevents spurious signals caused by signals outside the band. The signal that has passed through the low-pass filter formed by capacitors C2 and C3 is converted into a difference signal voltage, and the free-running frequency of the above-mentioned vCo is controlled in a DC manner.

A controlled signal is output from the collector of the transistor Tr. In other words, when a carrier of 2K)h is superimposed on the remote control signal and input, the output goes from H level to L level, and when a carrier is superimposed, the output goes from H level to L level, and when the carrier is superimposed, the output goes from H level to L level. When not in use, the output remains at H level. This output level change is input to the microcomputer CPU. Therefore, the microcomputer CPU receives the remote control signal and controls the TAM.

That is, the microcomputer CPU which receives the remote control signal first detects the start bit, and then deciphers the operation command code (described here as reproduction of the receiving tape T2), the parity code, etc.

The microcomputer then rewinds the receiving tape to a predetermined position, then turns on the switches S4, S6, and S2, and sends the receiving message to the telephone line 2.

When the reproduction of the message recorded on the reception tape T2 is completed, the reproduction of the reception tape T2 is stopped.

Then, when the user hooks on telephone 1, switch S
<, Ss, 82 is turned off, and the microcomputer CPU detects this, locates the beginning of the response tape T, and is set to receive the next call.

By the way, the beep tone generation circuit 15 communicates with the other party and the TAM.
@When recording the conversation with the installation side on the reception tape T2, or when the recording of the response message is finished, 5TO
It is controlled by a control signal from the microcomputer CPU at a desired timing, such as when the P or ANSERSET key is operated. The beep tone generation circuit 15 enables the signal output based on the control signal from the microcomputer CPU to be reproduced from the speaker SP, and furthermore, the line transformer LT
from the secondary side of the telephone line 2.

By turning on the switch $7 from the microcomputer CPU, it is possible to listen to the message received from the caller through the speaker SP when the response tape T+ and the reception tape T2 are respectively in a driving state.

[Same topic in the background art] The above-mentioned answering machine had a separate beep tone generation circuit that is generated when recording a call between the caller and the side where the TAM is installed on the reception tape T2, so the circuit configuration is different. The complexity was coming.

[Object of the Invention] The present invention simplifies the circuit configuration by using both a circuit for generating a beep tone and a circuit for detecting a remote control signal.

[Summary of the invention i! 1 The answering machine of the present invention responds to a caller's call, closes the telephone line, sends out a response message recorded in advance on a response tape, and then records the caller's received message. A user controls the answering machine by sending a remote control signal from an external telephone as necessary to the answering machine, wherein the answering machine transmits a remote control signal sent from the external telephone. The oscillator built in the remote control detection circuit for detecting and controlling the answering machine is also used as an oscillator for generating a beep tone to notify the answering machine If state when the remote control is not operated.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1, and parts that are the same as those in the prior art will be given the same reference numerals and their explanation will be omitted.

In the figure, this embodiment shows the PL of the remote control detection circuit 12.
When no remote control signal is received, the oscillation signal generated by the L circuit 14 is emitted from the speaker SP via the buffer 17 and switch 8, and is also sent from the line transformer LT to the telephone line 112. "Ss is controlled and recorded on the response tape T1 or reception tape T2. Note that the switch S
s is turned on and off based on the program of the microcomputer CPLJ when the TAM is set to a predetermined operation mode.
Jil is done.

For example, a beep tone recorded immediately after recording a response message on the response tape T1 to prompt the caller to record it on the reception tape T2 will be explained.

That is, the recording of the response message on the response tape T1 is completed, and 5TOP or ANSEWRS (not shown) is completed.
When you operate the ET KEY, this operation is executed by the microcomputer CP.
LI detects. Then, the CPU turns on the switch Sg, and causes the oscillation signal generated from ■CO of the PLL circuit 14 to generate a beep tone from the spooker SP via the buffer 17 → switch S8, and the microcomputer CPLI also turns on the switches S3, Ss, and SL. , switch S3, preamplifier 7, buffer amplifier 8, and switch S5, Sl
The information is recorded on the response tape T1 via the response tape T1.

Therefore, the caller calls the TAM from the telephone 1, the response tape T1 is driven, a response message is sent out, and when that is finished, the recorded oscillation signal of the PLL circuit 14 sends the message to the reception tape to the caller. This is a beep tone that prompts you to record.

Therefore, in this embodiment, the circuit configuration is simplified by using the oscillation section of the PLL circuit 14 of the remote control detection circuit 12 as a means for generating a beep tone.

[Effects of the Invention] As described above, according to the answering machine of the present invention,
There is no need to newly configure a circuit for generating a beep tone, and the circuit configuration can be simplified.

[Brief explanation of drawings]

Fig. 1 is a conventional circuit configuration diagram, and Fig. 2 is a circuit configuration diagram showing an embodiment of the present invention. 1...Telephone 2...Telephone Line T+...Response tape Tz...Reception tape 12...Remote control detection circuit 14...PLL circuit 8... switch

Claims (1)

[Claims] After the telephone line is closed in response to the caller's call and a response message prerecorded on the answering tape is sent, an answering machine that records the caller's received message is sent as necessary. In the answering machine, the answering machine is configured such that the user controls the answering machine by sending a remote control signal from an external telephone according to the user's response, wherein the answering machine detects the remote control signal sent from the external telephone and controls the answering machine. An answering machine, in which an oscillator built into a remote control detection circuit for detecting the answering machine is also used as an oscillator for generating a beep tone to indicate the state of the answering machine when the remote control is not operated.