JPH021981Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention detects a call, connects the line, cancels the standby mode, and reproduces and transmits outgoing messages on an endless tape and records incoming messages. The present invention relates to an answering machine that disconnects the line at the end of a call response, stops running the tape, and returns to standby mode again by detecting a conductive part for identifying the beginning and end of the tape.

[Conventional technology]

Conventionally, many of these types of answering machines have been formed using digital integrated circuits.

When a call is detected, the line is connected by the line control means, the standby mode is canceled, and the endless tape is run to reproduce and send out the message on the tape.

Further, after the end of reproduction, the received message from the caller is recorded on the recording tape until the conductive part for identifying the beginning and end of the endless tape comes into contact with a pair of sensing posts and is detected.

At the end of the call response in which the conductive part is detected, the line control means and the initial reset circuit are activated by an initial reset pulse, the line is disconnected by the line control means, and the endless tape is cut by the initial reset circuit. The machine stops running, returns to standby mode, initializes the device, and puts the endless tape and recording tape on standby.

[The problem that the idea aims to solve]

Incidentally, in the case of the conventional device, since an initial reset is also performed when the power is turned on, a pulse generating circuit is used as the initial reset pulse generating circuit to activate the line control means at the end of the call response based on the detection of the conductive part. In addition, a pulse generation circuit for activating the initial reset circuit is required when the power is turned on and the line of the line control means is disconnected, and furthermore, the configuration of the pulse generation circuit for activating the initial reset circuit becomes complicated.

Therefore, there is a problem that the configuration of the device becomes complicated and expensive.

Note that if the pulse of the pulse generation circuit for starting the line control means is used to start the initial reset circuit, the initial reset cannot be performed when the power is turned on, and the system is erroneously controlled to a mode other than the standby mode.

The object of the present invention is to provide an answering machine that uses a single pulse generating circuit with a simple configuration to generate an initial reset pulse when the power is turned on and at the end of a call response to perform an initial reset. There is.

[Means to solve the problem]

In order to achieve the above object, the present invention includes the means described below.

A pulse generation circuit for an initial reset pulse is connected to a capacitor into which the applied power is injected via a resistance for a charging path, and a discharge path provided between one sensing post and the capacitor to discharge the capacitor. a resistor, a grounding means for grounding the other sensing post, and a semiconductor element that performs a switching operation and generates an initial reset pulse when the capacitor is charged and discharged, and when the power is turned on and the conductive part of the endless tape contacts It outputs an initial reset pulse when passing.

[Effect]

In the device of the present invention configured as described above, when the power is turned on, the capacitor is charged and the semiconductor element is turned on until it reaches a predetermined potential, forming an initial reset pulse. Upon activation of the reset circuit, the device is immediately controlled to standby mode and initial reset is performed.

In addition, when the line is connected and the standby mode is canceled by the call detection, at the end of the call response when the conductive part of the endless tape is detected, the capacitor is discharged and charged in sequence, and the switching semiconductor is switched. An initial reset pulse is generated at an appropriate timing a little delayed from the start of contact between the conductive parts of the endless tape.

Then, by activating the line control means and the initial reset circuit based on the initial reset pulse, the line is disconnected, and the line is controlled to standby mode and initial reset is performed.

Therefore, the initial reset pulse of a single pulse generating circuit with a simple configuration that switches the semiconductor element by charging and discharging the capacitor,
Initial reset is performed when the power is turned on and when a call response ends.

〔Example〕

Next, the present invention will be described in the first part showing one embodiment thereof.
This will be explained in detail with reference to FIGS.

In FIG. 1, 1 is an endless tape on which a predetermined outgoing message is recorded in advance, and 2 is a tape 1.
3 and 4 are first and second sensing posts forming a tape sensor 5, and one end of both sensing posts 3 and 4 is connected to the tape 1.
The other end of the second sensing post 4 is grounded.

6 is a first resistor for a discharge path whose one end is connected to the first sensing post 3; 7 is a first capacitor for charging and discharging provided between the other end of the resistor 6 and the ground point; 8 is a first resistor whose one end is connected to the first sensing post 3; A second resistor 9 is connected to the other end of the resistor 6 for base current control, and 9 is a PNP type first transistor whose base is connected to the other end of the resistor 8.The emitter is connected to the power supply terminal 10 and is a switching semiconductor. Configure.

A third bias resistor 11 is provided between the base and emitter of the transistor 9, and together with the second resistor 8, forms a charging path resistor. 1
2 is a second capacitor for pulse width adjustment whose one end is connected to the collector of transistor 9; 13 is a fourth resistor for collector current limitation provided between the other end of capacitor 12 and the ground point; and 14 is a transistor. 9 is a fifth resistor for limiting the collector current provided between the collector and the ground point, and 15 is a capacitor 1.
2, and outputs a common initial reset pulse to the line control means and the initial reset circuit.

Note that the time constants of the resistor 8 and capacitor 7 are set larger than those of the resistor 13 and capacitor 12.

Then, when the device is powered on, the power terminal 1
By applying power to transistor 5, the emitter potential of transistor 9 becomes high level as shown in FIG. 2a, transistor 9 is turned on, base current flows, and capacitor 7 is charged.

At this time, as shown in FIG. 2b, the base potential of the transistor 9 rises as the capacitor 7 is charged, and when it rises to a predetermined threshold potential, the transistor 9 is turned off.

Therefore, as shown in FIG. 2c, the collector potential of the transistor 9 is at a high level from the time the power is turned on until the transistor 9 is turned off.
A high level pulse is formed.

Furthermore, the capacitor 12 is charged by the pulse from the collector of the transistor 9, and as shown in FIG. It is output from terminal 15.

Note that when the transistor 9 is turned off, the charge in the capacitor 12 is discharged via the fifth resistor 14.

Then, the initial reset pulse of the output terminal 15 is supplied to the line control means and the initial reset circuit, and by activation of this circuit, power supply to the motor for running the endless tape is prohibited and maintained, and the power is turned on after being controlled to standby mode. An initial reset of the time is performed.

Next, when a call signal is input from the line, the call detection circuit detects the call, and based on this detection, the line control means turns on the line control relay to connect the line.

Further, based on the detection of a call, the standby mode is canceled, power supply to the endless tape motor, etc. is started, the endless tape starts running, and a call response is started.

Then, the audio signal of the outgoing message obtained by running and reproducing the endless tape is sent to the caller.

Furthermore, after the transmission of the outgoing message is completed, the voice signal of the message from the caller is recorded on the recording tape.

On the other hand, the endless tape runs even while the received message is being recorded.

Then, at the end of the call response, both sensing posts 3 and 4 come into contact with the conductive part 2, and when the conductive part 2 is detected by the tape sensor 5, the capacitor 7 is The charged charge is discharged through the resistor 6, the sensing post 3, the conductive part 2, and the sensing post 4, and immediately after passing through the conductive part 2, the discharge ends and the capacitor 7 is charged again.

At this time, based on the discharging and charging of the capacitor 7, the base potential of the transistor 9 changes as shown in FIG. When the reverse occurs and the capacitor 7 is charged again by the passage of the conductive part 2, the transistor 9 is turned off.

Then, by turning on the transistor 9, as shown in FIG.
As shown in FIG. 3, the collector potential of transistor 9 becomes high level, and a high level pulse is generated again.

Based on this pulse, the capacitor 12 is charged again, and a pulse adjusted to the pulse width of the charging period of the capacitor 12 is outputted from the output terminal 15, as shown in FIG.

Then, the line control means is activated by the initial reset pulse of the output terminal 15, and the telephone line is controlled to be disconnected, and the initial reset circuit is activated and controlled to standby mode, and the initial reset at the end of the call response is performed. will be held.

At this time, the motor drive of the endless tape is stopped a little after the start of contact with the conductive part 2, and the running of the endless tape is stopped at an appropriate position immediately before the transmission message is reproduced.

Incidentally, even when the power is momentarily interrupted, an initial reset pulse is output from the output terminal 15 by turning on the power after the instantaneous interruption, so that accurate and reliable control can be performed.

In addition, the capacitor 12 is provided to adjust the pulse width of the initial reset pulse and quickly release the pulse input after the line is disconnected and the control to the standby mode is completed. If the pulse is short and pulse width adjustment is not required, capacitor 12 and resistor 1
3 may be omitted and the pulse of the collector of the transistor 9 may be directly outputted from the output terminal 15. In this case, the configuration is further simplified and the cost is reduced.

Further, the capacitor 7 is provided to switch the transistor 9 by charging and discharging. For example, if a resistor is provided in place of the capacitor 7,
When the power is turned on, the transistor 9 is immediately turned off and no pulse is formed, and at the same time, a pulse is formed immediately in synchronization with the start of contact of the conductive part 2. Moreover, when the conductive part 2 comes into contact, the bias of the resistor 6 is affected. Therefore, there is a possibility that the transistor 9 will not turn on.

The sensing post 4 may be a metal case of the recording/reproducing head or erasing head of the tape 1.

[Effect of idea]

Since the present invention is configured as described above, it produces the effects described below.

By charging the capacitor when the power is turned on and discharging and charging the capacitor based on the contact passing of a pair of sensing posts of the conductive part of the endless tape,
The semiconductor device switches to form an initial reset pulse, which disconnects the line and controls the standby mode.

Therefore, the pulse generating circuit that performs the initial reset when the power is turned on and when the call response is completed can be configured with one simple circuit.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the answering machine of the present invention, FIG. 1 is a wiring diagram of the main parts, and FIG.
Figures a to d are waveform diagrams of each part in Figure 1 when the power is turned on,
FIGS. 3a to 3c are waveform diagrams of each part in FIG. 1 when a conductive part is detected. 1... Endless tape, 2... Conductive part, 3,
4... First and second sensing posts, 5... Tape sensor, 6... First resistor for discharge path, 7... First capacitor, 8, 11... Second and third resistors for charging path , 9...first transistor, 15...output terminal.

Claims (1)

[Claims for Utility Model Registration] Upon detecting a call, a line is connected and the standby mode is canceled, an endless tape is run, a message sent from the tape is played back and sent out, and after the playback is finished, the beginning and end of the tape are identified. records an incoming message from the caller until the conductive part of the caller contacts the pair of sensing posts and the pulse generating circuit generates an initial reset pulse, and when the pulse generating circuit generates the initial reset pulse, In the answering machine, a line control means and an initial reset circuit are activated, the line control means disconnects the line, the initial reset circuit stops running the tape, and the answering machine is controlled to the standby mode, The generating circuit includes a capacitor into which the applied power is injected through a charging path resistor, a discharging path resistor provided between one of the sensing posts and the capacitor and discharging the capacitor, and the other. a grounding means for grounding the sensing post of the capacitor; and a semiconductor element that performs a switching operation by charging and discharging the capacitor and generates an initial reset pulse, and is configured to generate an initial reset pulse when the power is turned on and when the conductive part passes through contact. An answering machine that outputs pulses.