JPH0730642A - Automatic answering telephone system - Google Patents

Abstract

PURPOSE:To provide the system which can surely prevent malfunction with one remote control detecting means by cutting off the reproduced output of a recording and reproducing means when a remote control signal is detected. CONSTITUTION:When a recording and reproducing device 2 is set in a reproducing mode by the remote control signal and the reproduced signal of the recording and reproducing device 2 is outputted to a line L, the recorded remote control signal is leaked through a network circuit 1 to a receiving signal system as a side tone. Thus, after the lapse of 40ms, an input detection circuit applies an H level signal to a control circuit 6, a switch S is turned off, and no remote control signal is applied to the input detection circuit 4. After the lapse of about 40ms later, however, the input detection circuit 4 outputs an L level signal by using a time constant circuit, and the control circuit 6 turns the switch on again. Afterwards, this operation is repeated as long as the remote control signal is continued. Therefore, when reproducing the remote control signal from the recording and reproducing device 2, the H level signal is not continuously outputted from the input detection circuit 4 for 70ms, and the malfunction of the control circuit 6 does not occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an answering machine which enables remote control by a remote control signal input from a remote place through a telephone line.

[0002]

2. Description of the Related Art In recent years, an answering machine has become multifunctional,
A so-called DTMF signal which can be output from a public telephone or the like is used as a remote control signal, and a message is reproduced by remote control.

By the way, when this remote control signal is sent during recording of a message and is recorded together with this message, when the message is reproduced by remote control, it is recorded by side tone. When the remote control signal spills into the receiving system, it is detected as a remote control signal, resulting in malfunction.

As a conventional technique for preventing such a malfunction, for example, as disclosed in Japanese Patent Publication No. 58-12786, a recording signal path is cut off when a remote control signal is detected during recording, or a special technique. Fairness 4-40
As disclosed in No. 908, in addition to a normal remote control signal detection circuit, a reproduction remote control signal detection circuit for detecting a remote control signal from the output signal of the recording / reproducing apparatus is provided, and the normal remote control signal detection circuit detects the remote control signal. There is a remote control signal detecting circuit which detects the remote control signal and performs remote control when it does not detect the remote control signal.

[0005]

However, when the remote control signal is not recorded at the time of recording as in the former configuration, for example, a cassette tape recorded by a device other than this answering machine (cassette deck etc.) When mounted on an answering machine and played back, if a remote control signal is recorded on the cassette tape, there is a possibility of malfunction as in the conventional case.

In the latter configuration, two remote control signal detection circuits must be provided, which is not preferable.

[0007]

An answering machine according to the present invention records a message from a telephone line and detects a recording / reproducing means capable of sending the recorded message to the telephone line and a remote control signal from the telephone line. Remote control signal detecting means for controlling the remote control signal, and when the remote control signal detecting means detects the remote control signal, interrupts the reproduction output of the recording / reproducing means, and when the remote control signal detecting means detects the remote control signal for a predetermined time, the remote control signal And a control means for performing a predetermined control based on.

[0008]

Since the answering machine of the present invention is configured as described above, when the remote control signal is detected, the reproduction output of the recording / reproducing means is cut off.
The individual remote control signal detection means can surely prevent malfunction.

[0009]

Embodiments of the present invention will be described with reference to the drawings.
(1) is a network circuit connected to the telephone line (L) for performing 2-line to 4-line conversion. Reference numeral (2) is a recording / reproducing apparatus for recording / reproducing, for example, via a cassette tape, which records a reception signal from the network circuit (1) and reproduces the reproduction signal in the network circuit (1) via a switch (S). Output. Reference numeral (3) is a remote control signal detection circuit connected to the reception signal line from the network circuit (1), which is an input detection circuit (4) and a code detection circuit (5).
Consists of. When the input detection circuit (4) detects the input of the remote control signal which is a DTMF signal, it outputs an H level signal to the control circuit (6) described later. However, this input detection circuit (4) is set by a time constant circuit (not shown) so as not to output the H level signal unless the DTMF signal is input for 40 ms. This is because the voice signal included in the reception signal also contains the same frequency component as the DTMF signal, so that a malfunction in the voice signal is prevented (in the voice signal, the same frequency generally continues for 40 ms). That is rare). The code detection circuit (5)
Is for breaking the remote control signal received through the input detection circuit (4) and outputting the number indicated by the remote control signal as a digital code. (6) is a control circuit composed of a microcomputer, which inputs the signal from the remote control signal detection circuit (3) and controls the switch (S) and the recording / reproducing device (2). The control circuit (6)
Turns off the switch (S) when an H level signal is output from the input detection circuit (4) and turns on the switch (S) when an L level signal is output. Then, when the H level signal is continuously applied for 70 ms from the input detection circuit (4), the code data from the code detection circuit (5) is fetched and various operations are performed based on the code data (remote control signal ( The DTMF signal) is defined to be continuously output for 70 ms or more).

Next, the operation of the above configuration will be described.
First, in the mode for recording a message from the telephone line (L), when a remote control signal is given from the line (L), the remote control signal is recorded in the recording / reproducing device (2). At this time, the control circuit (6) turns off the switch (S).
Although it is set to FF, it has nothing to do with this recording operation. or,
The control circuit (6) controls the recording / reproducing device (2) according to the remote control signal.

Next, when the recording / reproducing device (2) is set to the reproducing mode by the remote control signal from the remote operator and the reproducing signal of the recording / reproducing device (2) is output to the line (L), the recording is performed. The generated remote control signal leaks to the reception signal clerk as a side tone through the network circuit (1).
As a result, the input detection circuit gives the H level signal to the control circuit (6) after 40 ms, and the control circuit (6) turns off the switch (S). As a result, the remote control signal is no longer applied to the input detection circuit (4), but the time constant circuit delays the input detection circuit (4) by about 40 ms.
Output level signal. As a result, the control circuit (6) turns on the switch (S) again. After that, as long as the remote control signal continues, this operation is repeated and the state shown in FIG. 2 is obtained. As a result, when the remote control signal is reproduced from the recording / reproducing device (2), the input detection circuit (4)
Since the H level signal is not output for 70 ms continuously, the control circuit (6) does not malfunction based on this remote control signal.

When a remote control signal is applied from the telephone line (L) during the reproducing operation, an H level signal is applied from the input detection circuit (4) to the control circuit (6) continuously for 70 ms or longer. (6) controls the recording / playback apparatus (2) based on the remote control signal. However, the control circuit (6) switches the switch (S) by the input of the remote control signal.
Since it is turned off, the playback message from the recording / playback device (2) cannot be heard, but normally the remote operator
When the numeric keypad or the like of the telephone is operated to send the remote control signal, it is considered that there is no intention of listening to the reproduced message, so there is no practical problem.

[0013]

Since the present invention is configured as described above, the detection of the remote control signal interrupts the reproduction output of the recording / reproducing means, and one remote control detecting means ensures the malfunction. Therefore, it is possible to provide an answering machine which is very useful.

[Brief description of drawings]

FIG. 1 is a block diagram of an answering machine according to the present invention.

FIG. 2 is likewise a diagram for explaining the operation.

[Explanation of symbols]

 2 Recording / reproducing device 3 Remote control signal detection circuit 6 Control circuit

Claims (1)

[Claims] 1. An answering machine which enables remote control by a remote control signal input from a remote place via a telephone line, can record a message from a telephone line and send the recorded message to the telephone line. Recording / playback means, remote control signal detection means for detecting a remote control signal from a telephone line, and when the remote control signal detection means detects a remote control signal, the playback output of the recording / playback means is shut off and the remote control signal detection is performed. An answering machine, comprising: a control means for performing a predetermined control based on the remote control signal when the means detects the remote control signal for a predetermined time.