JPS63196138A - Telephone set - Google Patents

Abstract

PURPOSE:To eliminate the need for a changeover of a tone/pulse selector switch to the position of the tone at each time by providing a polarity inversion detector and using polarity inversion information outputted from the polarity inversion detector. CONSTITUTION:A series of a dial number is sent to a station exchange as a dialing, and when the opposite party replies, the polarity of its own station is inverted. When the polarity inversion detector 11 detects the polarity inversion and outputs polarity information '2' to a tone pulse changeover controller 12, then the tone/pulse changeover controller 12 outputs logic 1. Then after dialing, the reply of opposite party and the inversion of polarity, when a dialer 8 detects a key input, since an input logic of a tone/pulse changeover input terminal 8a is logical 1 even when the tone/pulse changeover switch 7 is turned to the position of the pulse side, a pushbutton dial signal is sent to a line. Thus, it is not required to switch the switch to the position of the tone at each time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a telephone set connected to a public telephone line.

Conventional technology An example of a conventional telephone set is shown in FIG.

In FIG. 2, 1 is a connection cable connected to a public telephone line, and 2 is a hook switch, which is closed to make a call or answer an incoming call. 3 is a diode bridge that supplies power to circuits and devices within the phone.

Reference numeral 6 denotes a communication path circuit which closes the public telephone line in a DC manner, transfers voice, signals, or push-button dialing signals to the public telephone line, and separates and mixes transmission and reception. θ is a handset for sending and receiving calls. 9 is a key matrix for selecting a dial number. 8 is a dialer device that scans the key matrix 9;
Get pressed key power information. 7 is a tone/pulse changeover switch for selecting whether to send the selection signal as a push button dial signal or a dial pulse;
When it is switched to the tone side, it outputs a logic 1, and when it is switched to the pulse side, it outputs a logic 0. When the dialer device 8 obtains key manual information from the key matrix 9, when the logic input to the tone/pulse switching input terminal 8a is "1", the dialer device 8 sends a message to the communication path circuit 5 corresponding to the pressed key information. Send push button dial signal. Conversely, if the logic input to the tone/pulse switching input terminal 8a is "0", the dial pulse sending circuit 4, which connects or disconnects the public telephone line, is controlled to send out dial pulses.

Problems to be Solved by the Invention Using such a conventional telephone, after making a call and being answered by the other party, push-button dialing signals are used to send information to the other party, for example to carry out telecontrol, etc. In this case, there is no problem if the telephone line of the own station is a push button dial line, but if the telephone line of the own station is a dial pulse line, the tone/pulse selector switch 7 must be switched to the tone side. The problem was that it did not.

The present invention aims to provide a telephone that can transmit without operating a changeover switch depending on the type of line of the own station.

Means for Solving the Problems In order to solve the above problems, the present invention provides a galvanometer for detecting the current in the public telephone line, and a method for detecting the voltage applied to the public telephone line using the output of the galvanometer. A polarity reversal detector is installed that detects the polarity and detects when the polarity is reversed by the caller's response after dialing.The polarity reversal information output by the polarity reversal detector allows tone/pulse switching control to be installed on the push button dial. Outputs the logic that sends the signal,
The dialer device automatically switches to send a push button dial signal.

Effect of the Invention With the above-described configuration, the present invention requires that even if the telephone line of the own station is a dial pulse line, a switch is turned on the tone side each time when transmitting information using a push-button dial signal after the other party answers. There is no need to switch.

Embodiment FIG. 1 shows an embodiment of the telephone according to the present invention.
Components common to those in the figures are given the same numbers, and some explanations will be omitted. In FIG. 1, reference numeral 10 denotes a galvanometer, which connects a photocoupler 10a and
so that the light emitting diodes 10c and 10d of 0b can detect the polarity of the voltage applied to the public telephone line.
They are placed in parallel so that they have opposite characteristics.

10e and 10f are transistors of a photocoupler 10C11ob. When a current flows through the connection cable 1, either light emitting diode 10 is activated depending on the direction of the current flow.
c or 10d emits light, and the transistor 106 or 10f that receives the light is turned on. When the transistor 10e or 101 is turned on, a current flows through the resistor 10 (J or 10h). 11 is a polarity reversal detection device, and transistors 1041 and 10f of the photocouplers 10a and 1ob are connected so that the output of the galvanometer 10 is input'. connected to the collector.

The polarity reversal detection device 11 outputs polarity information “1” when power is not supplied from the diode bridge 3,
When power is supplied, a signal output from the galvanometer device 1o is input. Then, the polarity of the voltage applied to the connection cable 1 is determined, and when the polarity is reversed, the polarity information “
The polarity information "2" is output until the power supply is stopped or the polarity is restored. 12 is a tone/pulse switching control device, which outputs the logic input from the tone/pulse switching switch 7 as is to the dialer device 8 while the polarity information "1" is being input from the polarity reversal detection device 11; Polarity information "2" from the polarity reversal detection device 11
” is input, outputs logic 1.

Next, an explanation will be given of the operation when the own station is a dial pulse line, the user makes a call, the other party responds, and then transmits information using a push-button dial signal.

When the user goes off-hook, the hook switch 2 is closed, and the diode bridge 3 rectifies the station power supply to supply power to each device within the telephone. Here, it is assumed that the tone/pulse selector switch 7 is switched to the pulse side because the local station is a dial pulse line. Galvanometer device 1o
The polarity reversal detection device 11 determines and holds the polarity of the voltage of the connection cable 1 based on the signal input from the terminal. At this time, since the polarity reversal detection device 11 is outputting the polarity information "1", the tone/pulse switching control device 12 directly converts the logic 0 of the output signal of the tone/pulse changeover switch 7 to the tone/pulse of the dialer device 8. It is output to the pulse input terminal 8a.

Next, the user presses a key on the key matrix 9 to make a dial call.

Since the logic input to the tone/pulse switching input terminal 8a is 0, the dialer device 8 controls the dial pulse sending circuit 4 to send out the dial pulse corresponding to the pressed key information to the public telephone line. As shown above, after sending a series of dial numbers to the central office exchange and making a dial call, the polarity of the own station is reversed when the other party answers. The polarity reversal detection device 11 detects polarity reversal and outputs polarity information "2".
” to the tone/pulse switching control device 12, the tone/pulse switching control device 12 outputs a logic 1. Therefore, after dialing and the other party answers and the polarity is reversed, the dialer device 8 inputs the key manually. When detected, even if the tone/pulse changeover switch 7 is on the pulse side, since the input logic of the tone/pulse changeover input terminal 8a is 1, a push button dial signal is sent to the line.

Effects of the Invention As described above, even if your own station's line is a dial-pulse line, after the other party answers, when transmitting information to the other party using a push-button dial signal, the tone/pulse selector switch can be switched to the tone side each time. You don't have to.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a telephone according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional telephone. 1...Connection cable, 2...Hook switch, 3...Diode bridge, 4...
... Dial pulse sending circuit, 6 ... Call path circuit, 6 ... - Handset, 7 ... Tone/pulse switch, 8 - ... Dialer Device, 9...Key matrix, 1o...
Galvanometer device, 11...Polarity reversal detection device, 12.
...Tone/pulse switching control device.

Claims (1)

[Claims] a dialer device for selecting and sending out a dial from both a push button dialing signal and a dialing pulse; a galvanometer device for detecting current flowing through a public telephone line;
A polarity reversal detection device that detects the polarity of the voltage applied to the public telephone line by the output of the galvanometer and outputs polarity reversal information, and a tone that selects and switches between a push button dial signal and a dial pulse. /pulse changeover switch, input information from the polarity reversal detection device and input information from the tone/pulse changeover switch, the dialer device selects information for selecting whether to dial either a push button dial signal or a dial pulse. A telephone equipped with a tone/pulse switching control device that outputs a tone/pulse.