JPS63248261A - Control circuit for telephone set - Google Patents

Abstract

PURPOSE:To eliminate an individual switch for respective action modes, to simplify constitution and to improve reliability by converting a dial input to a special dial input, and constituting a circuit having a function to switch respective types of action mode of the telephone set. CONSTITUTION:In a dial input from a usual PB 2, both special function setting key KA3 and special function setting propriety key KB4 are turned on. When the action mode of a dial signal is switched, the KA3 and KB4 are turned off and the signal from a PB input detecting circuit PBDT11 is received by an FF circuit group FB15. For example, when buttons '3', '4' and '5' of the PB2 are pushed down, those are detected by the PBDT 11, the signal corresponding to those is outputted, an internal FF circuit corresponding to the buttons '3', '4' and '5' of the PB 2 is set by the output signal above mentioned, and outputs a signal group (a) to switch a make ratio, dial speed, dial signal to 40%, 10pps, a dial pulse signal, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control circuit for a telephone, and particularly to control circuits for controlling dial signals (for example, push button dial signal or dial pulse signal, dial speed is 10 pps according to CCITT standard). 201) I') S or make rate is 33
% or 40%, etc.) and other operating modes of the telephone.

[Conventional technology]

Conventionally, a switching control circuit for various operating modes of this type of telephone has been comprised of switches individually provided corresponding to each mode, for example, in the case of a dial signal operating mode. That is, separate switches are provided for switching between a push button dial signal and a dial pulse signal, for switching dial speed, and for switching make rate, and the conditions for generating the dial signal are set depending on the switching state of these switches. There is. A changeover switch is provided for each operation mode of the telephone, for example, for changing the listening level.

[Problem that the invention seeks to solve]

The conventional telephone control circuit described above has, for example, one switch for switching between a push button dial signal and a dial pulse signal, and a dial speed of 10 pps or 20 pps.
One switch is used to change the make rate, one switch is used to change the make rate to 33% or 40%, and one switch is used to change the various other operating modes, so the structure requires a large number of switches to be attached to the phone. In addition to being restricted in the installation of the upper switch, this also has the disadvantage of increasing cost.

Furthermore, since a large number of individual operation mode changeover switches are used, there is a drawback that reliability is reduced.

[Means for solving problems]

The telephone control circuit of the present invention includes: a key input detection circuit that detects normal dial input; a special input detection circuit that detects a setting input for changing the setting of the dial input to a special function dial input; a flip-flop circuit that is set by a logical product of an external switching signal that determines whether or not a function dial input is available and an output signal of the special input detection circuit, and is reset by a logical negation signal of the switching signal; It is set by the AND of the set signal of this flip-flop circuit and the output signal of the key input detection circuit, and is reset by the AND of the set signal of the flip-flop circuit and one preset output signal of the key input detection circuit. A push-button dialing signal or a dialing pulse which switches the dialing speed and make rate to predetermined values within the telephone operating mode by means of a flip-flop circuit group and some output signals from this flip-flop circuit group and a dial circuit for sending out signals, and the remaining signals from the flip-flop circuit group are used to switch other operating modes of the telephone.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, a telephone control circuit 1 of the present embodiment includes a PB input detection circuit (hereinafter referred to as PBDT) 11 that detects dial input from push buttons (hereinafter referred to as PB) 2, and a dial input from PB'2. Special function setting key (hereinafter referred to as KA) that changes the setting to special function dial input.
The special function setting input detection circuit (hereinafter referred to as SI) 12 that detects the input of three types, the off state of the special function setting enable key (hereinafter referred to as KB) 4 that determines whether or not to enable special function settings, and the SI 12 A high level signal is output from the set Q terminal by ANDing with the high level output signal.
The flip-flop circuit (hereinafter referred to as FA) 14 that resets when the FAI4 is turned on, and the internal flip-flop circuit is A group of flip-flop circuits (hereinafter referred to as FB) in which each of the internal flip-flop circuits is reset by the AND of the high-level output signal of the Q terminal of FA14 and the output signal of the PBDTI1 pin. )
15, and FB15 receives one output word from PBDTII.
A dial circuit (hereinafter referred to as DL) 16 that sends out a push-button dial signal or a dial pulse signal having a dial speed and make rate of preset values in the operating mode according to the output signal group a from the ing.

Incidentally, the output signal group of the FB 15 can be used as a switching signal for other operation modes, for example, the receiving amplifier gain or the output level gain of the push button dial signal.

Next, the operation of this embodiment will be explained.

DL16 has a dial signal operation mode, the make rate is 33% or 40%, and the dial speed is 20pp.
s, a 10 pps push-button dial signal, or a dial pulse signal, which is set in advance to be switched by an external switching signal.

In normal dial input from FB2, both KA3 and KB4 are in the on state, that is, the state shown by the broken line,
The output level of the Q terminal of FA14 becomes low, and the PBDT
The output from II is not input to FB15 but to DT16. In this case, the output from DL16 has a make rate of 33%.

It is preset to send a push button dial signal with a dial speed of 20 pps.

Next, when switching the operation mode of the dial signal, for example, set "3" of FB2 to 4 for switching the make rate.
Assume that °゛ is used for switching the dial speed, and "°5'" is used for switching the dial signal. First, KA3 and KB4 are turned off to create the state shown by the solid line. As a result, F
Since A14 is set and the output signal from terminal Q becomes high level, the signal from PBDTII is received by Fi 315. Here, for example, “3” of FB2
When the buttons “°, 4”, and “5” are pressed, the PBDTII detects them and outputs signals corresponding to them.
Internal flip-flop circuits corresponding to ",", "4°", and "5" are set, and the make rate, dial speed, and dial signal are set to 40% and 10 p p, respectively.
s, output signal group a to switch to dial pulse signal
Output.

Next, turn on K B 4 and the state shown by the broken line will appear! To begin with,
FA14 is reset, the output terminal Q becomes low level, and FB2 enters the normal dial input state.9 In this case, the operation mode of the dial signal corresponding to the number input from FB2 changes, with a make rate of 40% and a dial speed. A dial pulse signal of 10 pps is output from DL16.

Furthermore, if it is desired to switch the pause time, hooking time, etc. for other operation modes (for example, external circuits (not shown)), the corresponding switching buttons may be assigned to the FB2. For example, if you assign switching buttons corresponding to pause time and hooking time to "1'" and "2" of FB2, FB2
1゛.

If you press the button 2° and 2°, FB1 will appear in the above process.
A switching signal for pause time and hooking time can be obtained from the output signal group 5.

〔Effect of the invention〕

As explained above, the present invention eliminates the need for separate switches for each operation mode as in the past by using a circuit configuration that has the function of converting dial input into special dial input and switching between various operating modes of the telephone. Therefore, there are fewer restrictions on the telephone structure design, increasing the degree of freedom, eliminating problems caused by switch failures, and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Telephone control circuit, 2...Button button (
PB), 3...Special function setting key (KA14...Special function setting enable key (KB), 11...PB input detection circuit (PBDT) -12...Special function setting input detection circuit (SI) , 14... flip-flop circuit (FA),
15...Flip-flop circuit group (FB), 16...
・Dial circuit (DL). The purity of the drawing? D6. Subject of amendment: Figure 1 J of the drawing (proper writing method) 62/7/28 Showa year, month, day 1, indication of the incident Patent Application No. 082370, 1982
, Title of the invention Telephone control circuit 3, Relationship to the amended case Application Person Place
5-33-1 Shiba, Minato-ku, Tokyo Name (423)
) NEC Corporation Representative Tadahiro Sekimoto 4, Agent
(“1$1$) Address: Sumitomo Sanda Building, 37-8 Shiba 5-chome, Minato-ku, Tokyo 108

Claims (1)

[Claims] A key input detection circuit detects normal dial input, a special input detection circuit detects a setting input for changing the setting of the dial input to a special function dial input, and a special input detection circuit detects the input of the special function dial input. a flip-flop circuit that is set by the logical product of a switching signal from the outside and the output signal of the special input detection circuit, and is reset by a logical negation signal of the switching signal; a group of flip-flop circuits that are set by a logical product with an output signal of a key input detection circuit and reset by a logical product of a set signal of the flip-flop circuit and one preset output signal of the key input detection circuit; A dial circuit that sends out a push-button dial signal or a dial pulse signal in which at least dial speed and make rate of the telephone operating mode are switched to predetermined values by a part of the output signal from the flip-flop circuit group; A control circuit for a telephone set, characterized in that another operating mode of the telephone set is switched by the remaining signals of the group of flip-flop circuits.