JPS6272257A - Control system for telephone line - Google Patents

Abstract

PURPOSE:To obtain the system whose reliability is not deteriorated with time without requiring any mechanical device by inserting an electronic switch in series with a loop of a talking circuit of a telephone set and providing an electronic circuit controlling the said electronic switch. CONSTITUTION:A dial IC 1 uses a battery BAT incorporated in a telephone set to be always in the standby state. When a hook switch contact hs or an on-hook dial button contact ls is closed, the level of a terminal H of the dial IC1 goes to an L level and the level of terminals D, M goes to an H level. Thus, transistors (TRs)Q5, Q4 are turned on, then TRs Q3, Q2 are turned on, then a TR Q6 is turned on. The talking circuit forms a loop circuit to a telephone line by way of the circuit consisting of turning-on of the TRs Q2, Q6 and a loop circuit in a speech network 3 to attain the line connection. When required numeral information is issued from the dial keyboard 2 to input terminals KO K7 of the dial IC1, the terminal M keeps the L leel during dialing and the level of the terminal D repeats the change from H to L level by the number of dial figures.

Description

[Detailed Description of the Invention] [Summary] By digitizing the mechanical phone function and controlling the opening and closing of the telephone call circuit, including the dialing operation, with the electronic circuit, design freedom, miniaturization, and improved reliability are achieved. possible.

[Industrial application field]

TECHNICAL FIELD The present invention relates to the control of a telephone line of a telephone set, and more particularly to the switching of the telephone line of a telephone capable of on-footer dialing.

Telephones are basic communication terminals, but with the addition of speed dialing functions, on-footer dialing functions, etc., their uses have expanded and they have become a widespread communication device.

Mechanical switches are generally used to control telephone lines, but these switches require a large mechanism that operates using the weight of the handset, and the contacts are large because they allow communication current to flow through them. Especially with on-footer dial phones, there is no switch operation by hand cent.
Switching may require auxiliary means such as relays, which limits the shape, size, and reliability of the telephone.

Therefore, there is a need for a telephone line control system using a switch that satisfies the requirements of liberalizing the design of telephones, making them smaller and lighter, and improving their reliability.

[Conventional technology]

In many conventional telephones, telephone lines are controlled by mechanical foot switches or dial contacts, but recently electronic dial contacts have also been used. FIG. 3 is an example of a circuit diagram of a conventional telephone having electronic dial contacts, which will be explained below.

In Fig. 3, Ig (not shown) is the contact point, and t's is the contact point (q' shown).
(Not included) On-hook dial buttons with numbers are their contact points. Also, QO and Ql are dial transistors,
1 is the dial IC for dialing, 2 is the keyboard for dialing, and 3 is the transmitter and receiver.

It shows a speech network to which a ringer, a speaker, etc. are connected, and these constitute a telephone.

Explain the operation of connecting a telephone to a line.

s When the hook switch contact u2 or the on-hook dial button contact βS2 closes, the terminal H of the dial IC1 becomes low level (L level) and the IC is in the operating state, but when the terminal becomes high level (H level) Transistor Ql turns on, followed by transistor QO. At this time, the Fuchs s 8 inch contact 0°,' is closed, so together with the loop circuit in the speech network and transistor QO being turned on, the speech circuit becomes a closed loop and the telephone is connected to the line.

Dial is performed by applying required dial number information from dial keyboard 2 to terminals KO to 7 of dial ICI. When a line is connected, the normally H level terminal provides an output that changes from H level to L level depending on the number of dials to the base of transistor Q1. This turns transistor Q1 off and on, turning off transistor GO,
Turn it on and send out a dial pulse from the call circuit.

[Problem that the invention seeks to solve]

Conventional telephones use hookswitch contacts that operate in conjunction with the handset to turn the telephone line on and off.

This method requires both a large foot switch and a mechanical switch, which requires a large mounting volume, which limits the design of the telephone and makes it difficult to downsize the housing. In addition, mechanical contacts have a problem in that their reliability deteriorates over time.

[Means for solving problems]

The above-mentioned problem can be solved by the telephone line control system of the present invention, which includes an electronic switch inserted in series in the loop of the telephone communication circuit and an electronic circuit for controlling the electronic switch.

FIG. 1 is a diagram showing the principle of the present invention. In the figure, Ll, L
2 is a subscriber line connected to the exchange side, and 3 is a speech network (telephone communication circuit network). A dial circuit 1 (dial IC) and an electronic circuit A for intermittent control of the circuit loop are provided in parallel between the subscriber lines Ll and L2 and the speech network 3.
The contacts hs and Is of the hook switch and on-hook dial button of the handset inserted in series with L2 can be realized with a small current level supplied to the IC.

Therefore, by activating the dial circuit 1 by operating the handset or the on-hook dial button, a control signal is sent to the electronic circuit A, and the electronic circuit A sends a control signal to the transistor switch Q2. Controls Q6.

[Effect]

That is, in the present invention, turning off and turning on an electronic switch inserted in series in the communication circuit of a telephone corresponds to the opening and closing of a hook switch, and also controls the electronic circuit according to instructions from a dialing keyboard. Turning the electronic switch off and on sends out the dialed digits.

In this way, it is possible to obtain a telephone line control system that does not require any mechanical mechanism and whose reliability does not deteriorate over time, allowing for freedom in design and miniaturization of the housing.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples. The same reference numerals indicate the same objects throughout the figures.

FIG. 2 is a circuit diagram of a telephone according to an embodiment of the present invention.
．． Q6 is a transistor inserted in series in the communication circuit, Q
3. Q4. Q5 is a transistor Q2. The transistor in the electronic circuit that controls Q6, hs is a hook switch contact that carries a small current to operate the IC, and Is is an on-hook dial button contact.

The dial ICI is a battery BAT built into the phone and is always on standby. When the hook switch contact hs or the on-footer dial button contact Is closes, the terminal H of the dial ICI goes to L level and the terminal is closed.

h becomes H level, therefore transistor Q5. Q4 turns on and then transistors Q3. Q2 turns on, and transistor Q6 also turns on. Transistor Q2゜Q6
The speech circuit forms a loop circuit for the telephone line by turning on the speech network 3 and the loop circuit in the speech network 3, and a line connection can be established.

Explaining the dial operation, when the required numerical information is given from the dial keyboard 2 to the input terminals KO~7 of the dial ICI, the terminal maintains the L level during dial transmission, and the terminal remains high for the number of dial digits. The change from the level to the L level is repeated, so that the transistor Q4 remains off during dialing, and the transistor Q5 repeats off and on for the number of dial numbers, so the transistor Q2. Ω6 also repeats off and on, resulting in a dial sending operation.

Although a transistor is used as the electronic switch in the embodiment, the gist of the invention does not change even if another electronic switch is used instead.

〔Effect of the invention〕

As explained above, the telephone line control method according to the present invention has no fear of functional deterioration over time, has no design restrictions, and is suitable for miniaturization, weight reduction, and economicalization. Show effectiveness.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a circuit diagram of a telephone according to an embodiment of the present invention, and FIG. 3 is a circuit diagram of a conventional telephone. In the figure, 1 is a dial IC. 2 is a dialing keyboard, 3 is a speech network, HS is a wax inch contact, 1s is an on-hook dial button contact, Q2. Q6 is a transistor for switching the telephone line, Q
3. Q4. Q5 is a transistor Q2. The transistor of the electronic circuit controlling Q6 is shown. Tei 1 Infu 2

Claims (2)

[Claims] (1) A telephone line control system characterized by having switching electronic switches (Q2, Q6) provided in series with a telephone communication circuit, and an electronic circuit (A) for opening and closing the switches. (2) The telephone line control system according to claim 1, wherein a transistor is used as the electronic switch.