JP2558776B2 - Answering machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an answering machine having a remote listening function.

2. Description of the Related Art A conventional telephone answering machine with a remote listening function is called from a telephone having a telephone number different from that of the telephone answering machine to call the telephone apparatus with a remote listening function for remote control via an exchange. It is a thing.

However, in general, there is a method of use in which a plurality of ordinary telephones are connected in parallel to the central office line of the same telephone number as the answering machine.

This is the case, for example, in a home where the telephone is installed in a room other than the room in which the answering machine is placed.In particular, in the United States, the answering machine is installed in a study room, and the bedroom, living room, It is common practice to install a general telephone in a kitchen or the like connected in parallel to the same station line.

In this case, if the answering machine can be operated remotely, you can call the answering machine from a telephone with a different phone number while you are out and control it remotely, but from a telephone connected in parallel within the same home. There was a problem that the answering machine could not be called and operated remotely, so that it was necessary to go to the place where the answering machine was installed and operate the main body.

Means for Solving the Problems In order to solve the above problems, an answering machine according to the present invention detects that a general telephone connected in parallel to an answering machine main body is in an off-hook state, and is output from the ordinary telephone. By means of a specific DTMF signal, the ordinary telephone and the answering machine with remote listening function are connected in parallel and disconnected from the office line, and a means for supplying power in place of the office line is provided. is there.

Action The answering machine according to the present invention can be remotely controlled directly from a general telephone connected in parallel to the main body of the answering machine.

Example An example of the present invention will be described with reference to FIG.

1, 2 are chips and rings that are connected to the central line. A ringer circuit 3 and an office line changeover switch 4 are connected to the chip 1 and ring 2, and a bridge circuit 6, a general telephone 14 connected in parallel to the station line changeover switch 4, and a general telephone 14 connected in parallel are used for remote listening. A power supply circuit 5 that supplies a line voltage instead of the station line is connected. Connected to the bridge circuit 6 are a branch detection circuit 11 for detecting that an ordinary telephone set connected in parallel is in an off-hook state by a change in line voltage, and an interface circuit 7 for connecting a line.
The interface circuit 7 is connected to a speech circuit 87 for switching between transmission and reception, and the handset 9 is connected to the speech circuit 8
Connected to. Connected to the speech circuit 8 are a tone receiver circuit 12 for digging DTMF signals from the line, and a recording / playback signal circuit 13 for recording voice from the telephone line and reproducing the recorded voice signal and sending it to the telephone line. It Ten
Is a control microcomputer that controls the entire system.

First, a remote listening operation using a normal office line will be described.

The station line changeover switch 4 is normally connected to the A position, and when there is a call from another telephone device having a different telephone number, the ringer circuit 3 operates and a ringer sounds, and its output is connected to the control microcomputer 10. It

When the ringer sounds for a preset number of times, the interface circuit 7 is turned on by the output of the control microcomputer 10 to form a telephone circuit. In that state, when the signal for remote listening is output to the station line, it is input to the tone receiver circuit 12 through the chip ring → station line changeover switch 4 → bridge circuit 6 → interface circuit 7 → speech circuit 8 and decoded. Then, it is added to the control microcomputer 12. With the decoded signal, the control microcomputer 10 controls the recording / reproducing circuit 13, and the recorded signal is reproduced and output to the local line so that it can be heard remotely.

Next, a remote listening operation by the general telephones 14 connected in parallel will be described with reference to FIG.

In step 22, whether or not the parallel-connected telephone set 14 is in the off-hook state is determined by the branch detection circuit for detecting the voltage change of the telephone line. If it is off-hook, the interface circuit 7 is turned on in step 23 to form a telephone circuit,
In step 24, the tone receiver circuit is set to the input reception state. In that state, if there is a preset code input (program set of the control microcomputer 10) from the tone receiver circuit 12 (step 25), the station line selector switch 4 is switched from A to B in step 26, and step 27 Enter the remote listening state by the parallel connection telephone of.

In this state, the recording / reproducing circuit 13 is controlled by the control microcomputer 10 by the code input, and the remote listening state is continued.

On the other hand, the branch detection circuit 11 constantly monitors whether or not the parallel-connected telephones are off-hook (step 2
8) If it is in the off-hook state, the remote listening operation is continued, and if it is in the on-hook state, it is judged that the remote listening state has ended. In step 29, the interface circuit 29 is turned off, and in step 30, the input receiving state of the tone receiver circuit 12 is accepted. Is released, the station line changeover switch 4 is switched from B to A in step 31, the station line side is connected, and the initial state of step 21 is restored.

EFFECTS OF THE INVENTION According to the present invention, the main body of the answering machine with remote listening function is disconnected from the office line by the DTMF signal from the parallel-connected telephones, and is connected to the parallel-connected telephones, so that the remote-connected telephones can be remotely heard. Thus, it is possible to realize an answering machine that enables remote listening from any parallel-connected telephones in the home.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an answering machine with remote listening function of the present invention, and FIG. 2 is an operation flowchart of the same. 3 ... Ringer circuit, 4 ... Station line selector switch, 5 ... Power supply circuit, 6 ... Bridge circuit, 7 ... Interface circuit, 8 ... Speech circuit, 9 ... Handset,
10 ... Control microcomputer, 11 ... Branch detection circuit, 12 ...
… Tone receiver circuit, 13 …… Recording / playback circuit, 14 …… Parallel telephones connected in parallel.

Claims (1)

(57) [Claims] 1. An answering machine capable of listening to a recorded content by remote control, wherein a station terminal and a connection terminal for a telephone connected in parallel to the main body of the answering machine and a telephone connected in parallel are in an off-hook state. An answering machine characterized by means for detecting that the telephone has been turned off, means for detecting when a specific signal is transmitted from the telephone and disconnecting the telephone from the office line, and means for supplying voltage to the telephone. Telephone device.