KR100195012B1 - How to control your phone to prevent error tones - Google Patents

Abstract

A dial dispensing control method for a telephone having a keypad, a dial dispensing means for transmitting a dialing tone corresponding to a key located on the keypad, and a ring detecting means for detecting a ring signal received from the outside. The present invention relates to a control method for preventing transmission of a dialing tone that is transmitted in error while in a call with a counterpart. The control method includes a ring detection process for detecting the presence or absence of a ring signal received from the outside, a key on the keypad that is input after the off-hook, responding and detecting the ring signal during the ring detection process. It comprises a control process consisting of a key signal input blocking process for blocking a signal.

Description

How to control your phone to prevent error tones

1 is a block diagram of a general telephone.

2 is a flowchart of dial transmission control according to the prior art, which is a flowchart when a dial button is pressed in an electronic telephone.

3 is a flowchart of dial transmission control according to the technique of the present invention, which is a flowchart when a dial button is pressed in a state of a call in an electronic telephone.

The present invention relates to a method for controlling dial transmission of a telephone, and more particularly, to a control method for preventing transmission of a dialing tone transmitted in error in a state of being in communication with a counterpart in response to an incoming call.

Typically, a universal button telephone device used exclusively for use in connection with an electronic telephone, for example, a telephone exchange, is known as a key on a keypad (also called a button key or dial key) installed in the telephone, as is well known. In the present invention, when this is collectively referred to as a key, the corresponding DTMF (Dual Tone Multi-Freqency (hereinafter referred to as DTMF)) is generated as a dialing tone and superimposed on a DC voltage (-48 volts) on a telephone line. It has a function to send.

FIG. 1 is a block diagram of a general telephone terminal, comprising: a bridge diode (hereinafter referred to as a rectifier) 12 and a rectifier 12 connected to trunk lines T and R to polarize and output trunk lines voltage input through the lines T and R. A ring detection circuit 14 which detects and outputs a ring signal input to the trunk lines T and R in parallel and connected to an input terminal of a line, and hang-on / hang-off of a handset (not shown). hook switches 26a and 26b which are interlocked with the hang-off (holding the handset) and dialing keys, redial keys and memory keys of the telephone to generate key signals corresponding to the selection of the keys. A call-related control signal is generated in response to the keypad 16 and the on-hook and off-hook states of the hook switches 26a and 26b, and the dialing tone, redial tone and memory corresponding to the key signal generated from the keypad 18 are generated. A control circuit 18 connected to the handset, and outputs a voice signal from the handset and a dialing tone output from the control circuit 18 in response to the control of the control circuit 18, and amplifies the input voice signal. Is connected between the communication circuit 20 for outputting through the communication circuit and the output terminal of the rectifier 12 and the communication circuit 20 to form a voice call path in response to the input of the call path forming control signal output from the control circuit 18, and cuts off the call path. A call control circuit 28 which cuts off a communication path in response to a signal input, a ring generating circuit 22 which generates a ring signal output from the control circuit 18, and a speaker 24 which generates the generated ring signal as an audible sound. . Here, the control circuit 18 may be a conventional one-chip microprocessor or the like. Such telephone-only microprocessors incorporate a DTMF generator, as is well known in the art.

The circuit of the telephone constituted as shown in FIG. 1 is a circuit disclosed in detail in patent application No. 22102, filed October 23, 1993, by Samsung Electronics Co., Ltd., which is already available to those who work in this technical field. It is a well known technique.

It should be noted that in the detailed description of the present invention, only technical configurations for understanding the operation of the present invention will be described within the scope of not obscuring the contents of the present invention, and detailed description thereof will be omitted.

A process of processing key data by a dial key, a redial key, a memory key, and the like in the circuit of the telephone constructed as shown in FIG. 1 is shown in FIG. 2.

2 is a flowchart of a dial transmission control according to the related art, which is a flowchart when a dial button is pressed in an electronic telephone, and the operation thereof will be described below.

Now, when the circuit of the telephone like Fig. 1 is operated, the control circuit 18 first searches for the on / off state of the hook switch 26a as shown in Fig. 2 so that the current operating state of the telephone is set to off-hook (hook switches 26a, 26b). Turned on). If it is determined that the switching state of the hook switches 26a and 26b is off-hook, the control circuit 18 outputs a communication path forming control signal to the communication path control circuit 28 to form a galvanic flux of the trunk line voltage. Search from 16 for key signal generation.

In the above state, if a key signal is generated and input from the keypad 16, the control circuit 18 analyzes the input key signal. That is, it searches for a ten key (digits 0 to 9 and keys such as # and *) or a redialing key or a redialing key. In accordance with the determination of the searching process, the control circuit 18 drives the DTMF generator built therein to generate a dialing tone DTMF corresponding thereto and supplies the same to the call circuit 20.

For example, if it is determined that the input key signal is one of the ten keys, the control circuit 18 stores the digit data corresponding to the digit of the input key in the key buffer and uses the DTMF with the corresponding dialing tone. To the call circuit.

If it is determined that the input key signal is a redialing key, the control circuit 18 responds to the redialing key by using a DTMF embedded dialing tone corresponding to dial digits stored in an internal dial buffer. Will output

Finally, when it is determined that the input key signal is a memory key (one-touch dialing key), the control circuit 18 accesses a digit stored in a location corresponding to the input memory key and uses a DTMF incorporating a dialing tone corresponding thereto. To the call circuit.

The dialing tone supplied to the communication circuit 20 by the above operation is transmitted to the other party (where the other party may be a telephone exchange, or, in the case of a call, the talker during the call) through the call control circuit 28 and the rectifier 12. do.

However, in the conventional telephone control method having the sequence as shown in FIG. 2, even when a ten key, a redial key, or a memory key installed on the keypad 6 is pressed due to the carelessness of the user during a conversation with the other party, the tone signal is transmitted to the other party in the call. There has been a problem of discomfort to the other party by the call.

Accordingly, an object of the present invention is to provide a control method such that no dialing tone is transmitted even when a key button provided on a keypad of a telephone is pressed during a call.

Another object of the present invention is to provide a control method for preventing dialing transmission due to an error by canceling generation of a tone signal corresponding to an input key signal after forming a call path in response to reception of a ring.

The present invention for achieving the above object is a telephone having a keypad, dial transmitting means for transmitting a dialing tone corresponding to a key located on the keypad, and a ring detecting means for detecting a ring signal received from the outside. A dial transmission control method, comprising: a ring detection process for detecting the presence of a ring signal received from the outside, a keypad input off-hook in response to detecting a ring signal in the ring detection process, and input after the off-hook Characterized in that the key signal input blocking process for blocking the key signal on the top.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart of dial transmission control according to the technique of the present invention, which is a flowchart when a dial button is pressed in a call state in an electronic telephone. Its control flow is operated to prevent the outgoing of dialing tone by ignoring key input when off-hook in response to an incoming call.

The operation of the telephone having the control sequence according to the present invention will be described in detail with reference to the flowcharts of FIGS. 1 and 3 as follows.

Now, when the telephone is operated, the control circuit 18 searches the output of the ring detection circuit 14 in step 30 of FIG. 3 to search for incoming calls. If there is no ring signal (ringing detection) detection signal in step 30, the control circuit 18 jumps to the branch of 32 to perform the routine of FIG.

That is, the dial tone is transmitted by operating in the same sequence as in the prior art. Here, if there is no detection of the ring signal, the reason for operating in the same procedure as in FIG. 2 is to receive service by the DTMF signal when the caller (the caller first calls the other party). Such service types are typical of the use of ARS and pager calling, which are currently useful as telephone terminals. Therefore, in the present invention, when the caller is the caller, the same operation is performed as in the prior art.

If it is determined in step 30 that the ring detection signal is output from the ring signal detection circuit 14, the control circuit 18 searches for the switching state of the hook switch 26a in step 34 to search for the state of off-hook. When the hook switches 26a and 26b are turned on by the user's action in the above state and a low signal is input, the hook switches 26a and 26b are determined to be off-hook.

The control circuit 18, which is determined to be off-hook in step 34, controls the communication path control circuit 28 in step 36 to connect the communication circuit 20 and the output of the rectifier 12 to connect the communication paths, and in step 38 the key signal is input from the keypad 16. Search for if possible.

If it is determined in step 38 that the key signal is input from the keypad 16 in the above state, that is, in a call with the other party, the control circuit 18 erases it in step 40. By the above operation, even if a key installed on the keypad 16 is pressed in a call state, the tone signal is not transmitted to the counterpart. That is, it ignores the input of the key signal and searches for the on-hook state by searching the switching state of the hook switch 26b in step 40.

In other words, the user ends the call and searches whether the hook switch 26a is in the off state. If the determination result of step 42 is determined to be on-hook, the control circuit 18 controls the call control circuit 28 to terminate the call by cutting off the call path. Perform.

Therefore, the control method according to the present invention may not give a discomfort to the call by not transmitting a communication call to the other party in the call even if a key on the keypad is pressed in the call state.

Claims (3)

A dial dispensing control method for a telephone having a keypad and a dial dispensing means for transmitting a dialing tone corresponding to a key located on the keypad, and a ring detecting means for detecting a ring signal received from the outside, wherein the ring is received from the outside. A ring detection process for detecting the presence or absence of a signal, and a key signal input blocking process for off-hooking in response to detecting a ring signal in the ring detection process, and blocking a key signal on a keypad input after the off-hook. Error tone transmission prevention control method of the telephone, characterized in that made. The method of claim 1, wherein the key signal input blocking step comprises: a call path forming step of forming a call path in response to off-hook, a key signal input searching step of searching for an input state of a key signal from the keypad; In the searching process, the key signal is ignored at the time of input, the off-hook searching process for searching whether the operation of the phone is off-hook, and the off-hook searching process until the off-hook status is determined to be determined. The method of claim 1, wherein the method comprises maintaining the communication path and blocking the communication path in response to an off-hook. The method of claim 1 or 2, further comprising the step of transmitting a dialing tone corresponding to an input of a key signal on the keypad in response to off-hook in the absence of ring detection from the outside. To control the error tone transmission of the telephone.