JPS63135045A - Telephone communication system - Google Patents

Abstract

PURPOSE:To prevent a communication line left undisconnected due to forget of on-hook manual operation or disturbance by generating a signal commanding opening of a hook switch after a prescribed timing after the detection of a busy tone or a loss of reception and transmission voice. CONSTITUTION:In the mutual talking by a wired telephone set or a codless telephone set provided with a function switching a telephone line by electric control, the reception circuit and transmission circuit confirm the incoming of the voice signal and stop of transmission are confirmed and if any of talking parties is hooked off, since a busy tone is sent to send an open command of a hook switch SWF electronically after a prescribed time after the detection of a dial input at call or after the detection of the busy tone or after the loss of the voice signal. Thus, the talking line left undisconnected, that is, the line kept connected is prevented surely.

Description

Detailed Description of the Invention: "Industrial Application Field" The present invention is intended to prevent problems caused by forgetting to disconnect the line after the end of the call or by erroneous operation during mutual calls using wired telephones or cordless telephones equipped with the function of opening and closing telephone lines by electrical control. This invention relates to a telephone communication system aimed at preventing unnecessary line usage.

``Prior Art'' Taking cordless telephones as an example, in the above-mentioned devices, calls are made between a telephone with a transmitter/receiver and a handset with a transmitter/receiver connected to a telephone line as a connecting device through radio waves. The connection device is not only a transmitter/receiver, but also has a handset, dial part, etc. like a portable handset, and when the handset is placed on the receiver, the call line is automatically disconnected, and when removed from the housing holder. There are devices that allow you to make calls in the same way as a handset.

Therefore, the handset is equipped with a hook switch that generates an on-hook signal to send a start signal to the connected device and an on-hook signal to send a call line disconnection signal, and this hook switch can be manually activated to start or end a call. are operating.

By the way, if the user forgets to operate the hook switch even after the above-mentioned call has ended, the call line will remain connected. If this state remains, you will not be able to receive calls, and if you forget to turn off the hook switch while the caller is not answering the call signal, the call signal will not be sent. Furthermore, after the call ends, even though the other party is on-hook, if I remain off-hook, the exchange will send out a busy tone and the line will remain connected. This will cause the same problem as above.

Therefore, in order to solve the above-mentioned problem, it has conventionally been considered to provide a reset means to cut off the telephone line and set the phone to an on-hook state based on a detection signal corresponding to the attachment/detachment of the handset to/from the housing holder. There are also known devices in which communication with a communication partner is controlled by microcomputer software.

However, in conventional communication systems, the end of a call depends on the act of returning the handset to the stand or manually operating the switch on the handset to open the hook switch, so there is no fundamental solution to prevent forgetting to disconnect the call line. It wasn't.

``Problem to be Solved by the Invention'' The present invention focuses on the fact that it is possible to reliably detect the end of transmission and reception in a telephone call depending on the presence or absence of an audio signal or the presence or absence of a busy tone. Confirm that the incoming and outgoing audio signals have stopped in the receiving circuit and the transmitting circuit, and considering that if one of the callers is in an off-hook state, a busy tone will be emitted, By making the hook switch open command electronically issued after a certain period of time after detecting the above-mentioned busy tone or detecting the presence or absence of dial input when making a call, it is possible to reliably prevent forgetting to disconnect the telephone line. There it is.

The system of the present invention will be explained below using specific examples.

``Example'' First, Figure 1 is a circuit diagram of the main parts of a wired telephone system implementing the method of the present invention, in which sending and receiving calls are separated via a seven-way network (SWF) on the central office line, which is a telephone line. A hybrid circuit 8 is connected to the called speaker 41 via the tone ringer 1 from the incoming terminals T, , T of the office line.

Reference numeral 2 denotes a control unit mainly composed of an electronic device such as a processor, which issues commands such as on-hook to the hook switch by receiving a telephone number, an off-hook or on-hook signal from an input means 3 that dials or operates a key switch. It looks like this. AI and A2 are amplifiers (AM
A1 is provided on the receiving circuit side and A2H is provided on the transmitting circuit side, and the detected signals are sent to the control section 2, respectively.

Reference numeral B designates a busy tone detector, which is provided on the receiving circuit side, and a detection signal is applied to the controller. 5 is a microphone and a speaker for calling 4
2 constitutes a handset.

Here, the input means is a rotary type that can not only dial in a telephone number but also input functions such as dial 1 call hold and memory input.

Any switch such as a bush type may be used.

Therefore, when talking between wired telephones, if one of the parties forgets to perform the manual operation to issue an on-hook signal using the input means even though the call has ended, the call is not sent.

When no voice signal is detected on either the receiver or when a busy tone is detected by the busy tone detector, the hook switch (S
Wr) is automatically opened, so the communication circuit is completely cut off.

Next, a connecting device (Fig. 2) connected to a telephone line and equipped with a receiver 6 and a transmitter 7, a handset 5, and a 41° input means 3.
．． A handset as a mobile phone equipped with a control unit 2 (
(Fig. 3) via a wireless IJ link,
An audio signal detector AI is provided in each of the radio equipment, that is, the transmitter and the receiver of the connection device.

A2 is provided, and a busy tone detector B is provided on the receiver circuit side, and these are used as inputs to the control section.

Therefore, if you forget to turn on-hook after a call ends, the hook switch of the connecting device can be automatically opened via radio waves by operating the handset in the same order as in the wired telephone system.

Figure 4 shows an example of an audio signal detector, in which the audio signal is amplified by an amplifier AMP and a capacitor.

A detector (DET, ) composed of diodes,! It consists of a switching transistor Q.

Here, a comparator can be used instead of a transistor.

Figure 5 shows an example of a busy sound detector, which transmits 400 Hz (i) on the -carrier intermittently at 400 ± 20 Hz with an intermittent ratio of 60 LPM ± 20% and a make rate of 50 ± 10%. The sound Ss is taken out via the limiter LIM and sent to the control section 2 in addition to the timing detector DET which detects the timing of the above-mentioned 5QIPM through the bandpass filter BPF.

Now, if a CPU is used as the electronic device that constitutes the control unit, the busy sound can be converted into a rectangular wave through a limiter, and the frequency is 400.
Since the Hz multiplied signal timing can be recognized, the bandpass filter and timing detector can be eliminated.

``Effects'' The telephone communication system of the present invention has a tremendous effect that it can be applied to most telephone communication systems, including switchboards that emit a busy tone. In other words, after the incoming voice and the outgoing voice disappear or the busy tone is detected, the controller issues a signal commanding the opening of the hook switch after a certain period of time has elapsed, thereby cutting off the telephone line, and the on-hook manual operation is activated. It is possible to completely prevent disconnection of the telephone line due to forgetting to connect or interference.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a wired telephone system implementing the telephone communication method of the present invention, and both FIG. 2 and FIG. Figure 3) circuit configuration diagram. FIG. 4 is a circuit diagram showing an embodiment of the audio signal detection circuit, and FIG. 5 is a circuit diagram showing an example of the busy tone detection circuit. 1: Tone ringer, 2: Control unit, 3: Input means 41: Called speaker, 5.42: Handset, 6: Receiver, 7
: Transmitter, AI, A2: Audio signal detection circuit, B: Busy tone detection circuit.

Claims (1)

[Claims] A wired telephone system consisting of a handset and a dial unit, etc., or a wireless telephone system in which a connecting device connected to a telephone line and consisting of a transmitter/receiver and a mobile telephone consisting of a handset, a transmitter/receiver, a dial unit, etc. are linked by radio. In a system for electrically controlling a telephone line, the control unit is an electronic device that receives control signals such as a telephone number, on-hook or off-hook through input means such as a key switch or dial, and instructs to turn on and off the telephone line. A voice signal that detects the interruption of the voice and the transmitting voice by at least one of the receiving circuit and the transmitting circuit of the calling party or the called party, respectively, and the busy tone detection signal of the speaking circuit are sent to the electronic device. In addition, the electronic device issues a command to open the hook switch when a certain period of time has elapsed after the audio signal disappears or after the busy tone is detected, thereby preventing forgetting to disconnect the telephone line. telephone communication method.