KR900005155B1 - Automatic answering method of speaker phone - Google Patents

Abstract

The answering method for switching the subscription line to the speaker phone whenthe number of ring signal is matched to the preset ring number stored in a memory so that the called person who is in busy have not to pick up the hand set and communicate the call through the speaker.

Description

Auto Answering Method for Speakerphone

1 is a speakerphone circuit diagram according to the present invention.

2 is a flow chart in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

HS-HS1: Hook Switch ASW: Analog Switch

10: ringer circuit 20: ring detection circuit

30: auto answer mode switch 40: key input circuit

50: microprocessor 60: dial pulse circuit

70: call path 80: speaker phone circuit

In the speaker phone circuit, the present invention detects an input ring signal and counts it to auto-answer by a built-in program to answer a call without lifting a handset. It is about.

In general, the speakerphone performs all the functions of a telephone and forms a trunk line loop without lifting a handset to call the callee or press a speakerphone key when a ringer signal arrives. You can talk without holding the handset.

Although the conventional speakerphone as described above has a built-in microprocessor for controlling various functions of the phone, when a ring signal arrives, a call can be made only by manually forming a trunk line loop by lifting a handset or pressing a speakerphone function key.

Therefore, when a ring signal is ringing on the phone used by the user by dialing from the remote side, there was an inconvenience in receiving a call in the middle of busy time.

Accordingly, an object of the present invention is to count the ring signal input when the ring signal arrives to the phone having the function of speakerphone by software and automatically answer when the number of rings is set in the internal memory to form a trunk line and make a call. To provide a way.

Still another object of the present invention is to provide a method for generating an automatic response signal by detecting a ring ring input.

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

FIG. 1 is a circuit diagram of a speakerphone according to the present invention. The hook-switch (HS) connected between a trunk line (L1) and a trunk line (L1) (L2) are connected between trunk lines (L1) to turn on / off-hook a trunk line as the handset is lifted. Hook switch (HS1) connected to the hook-switch (HS) in the opposite operation in conjunction with the hook-switch (HS) and the ring signal input from the telephone line (Detection) Ringer circuit 10 for outputting a ring signal as an audible sound through the speaker (SP), a photocoupler (PC), a capacitor (C1) and a resistor (R1) is composed of the trunk line (L1) and ringer circuit (10) A ring detection circuit 20 connected between input terminals and detecting a ring signal input to the trunk line L1 and outputting a predetermined signal, a dial digit key, a speaker phone key, and an auto answer mode key. Key input circuit 40 for generating a signal by pressing a key And a microprocessor that analyzes the input signal of the key input circuit 40 by a built-in program and outputs a speakerphone function signal, a dial transmission signal, a DTMF transmission control signal, an auto answer mode signal, and a speakerphone function signal. Unit (hereinafter referred to as MPU) 50, and between the ring detection circuit 20 and the ring signal input port of the MPU 50, ring detection signal by the MPU 50 automatic response mode control signal Is connected to the auto answer mode switch 30 for switching output to the MPU 50 and the hook switch HS, and the trunk line is turned on / off by a signal of a speakerphone function signal output from the MPU 50. A dial pulse sending circuit connected between the analog switch ASW hooked and the trunk line L1 and L2 and sending a pulse signal to the trunk line by a pulse dial sending control signal output from the MPU 50. 60, It is connected between the receiver and receiver of the set and the trunk line (L1) and (L2) to form a call path when the handset is lifted, and generates and outputs a multi-frequency code by the DTMF (Dual Tone Multi Frequency) transmission control signal of the MPU 50. To a speaker phone circuit 80 which forms a communication path which can be sent to the microphone MIC and the speaker SPK by the output of the call circuit 70 and the speaker phone function signal of the MPU 50. Reference numeral L1, L2 denotes a positive line (-) output terminal of a polar alignment bridge diode (not shown) as a trunk line.

2 is an automatic response flow chart according to the present invention. When the automatic response mode is set, the automatic response mode enters the automatic response mode, determines the input of the ringer signal, counts the number of inputs of the ring signal, and outputs the speakerphone function signal at a specified number of times. It is a flow chart that forms a loop and automatically makes a call.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the above-described configuration and flowchart.

The hook switch HS for forming a trunk line loop and the analog switch ASW for supplying a trunk line call current of a speakerphone connected in parallel with the hook switch HS are " off " Assuming that the hook switch HS1 that performs the opposite operation in conjunction with the " on " is in the on state, the telephone circuit of FIG. 1 is in the on-hook state.

In the on-hook state, when a ring signal of 20HZ is input to the trunk line L1 and L2 having a 1 second / second short period, the ringer is connected via only the hook switch HS and the light emitting diode PD of the photo coupler PC. It is input to the circuit 10. The ringer circuit 10 detects an input ring signal and outputs the ring signal to the speaker SP, and the speaker SP outputs it as an audible sound.

In the state where the ring signal arrives as described above, when the user lifts the handset and turns off the hook, the hook switches HS and HS1 are switched on and off, respectively.

Accordingly, the trunk line voltage input through the trunk line L1 and L2 is input to the dial pulse circuit 60, the call circuit unit 70, and the speaker phone circuit 80, respectively. A loop is formed so that a call can be made with the other party like a normal telephone.

If the user presses the speakerphone key in the key input circuit 40 while the ring signal arrives as described above, the MPU 50 detects the speakerphone key input input to the key signal input port KP and detects the terminal SK1. (SK2) outputs the speakerphone function signal in the "high" state. At this time, the analog switch ASW is "on", and the speakerphone circuit 80 is enabled by the "high" speakerphone function signal output from the terminal SK2 of the MPU 50.

The speakerphone circuit 80 enabled by the speakerphone function signal forms a current loop of the trunk line voltage input through the analog switch ASW to form a communication path between the microphone MIC and the speaker SPK. The voice signal is transmitted and received by L1) and L2.

On the other hand, when the user presses the auto answer key installed in the key input circuit 40 in order to automatically respond to the ring signal input by pressing the handset or the speakerphone key as described above, the key input circuit 40 is automatically pressed. Key data corresponding to the response key is input to the key signal input port KP of the MPU 50. At this time, when key data is input to the key signal input port KP, the MPU 50 searches and determines whether the signal input in the process of FIG. If the search determination in step 2-1 is not the auto answer key, the MPU 50 processes the key signal input from the key input circuit 40 in step 2-2. Therefore, when a ring signal is input to the trunk lines L1 and L2 when the auto answer key is not input, the ring signal is reproduced and output as it is from the speaker SP through the ringer circuit 10.

If the input key signal is the auto-answer key in the search determination of FIG. 2-1, the MPU 50 enters the auto-answer mode as shown in FIG. The automatic response control signal of "high" is outputted to the automatic response mode switch 30.

At this time, the auto-response mode switch 30 connected between the emitter of the photo transistor PT of the ring detection circuit 20 and the ring signal input port RIN of the MPU 50 is an analog switch or a tri-state switch or switching. It may be composed of a transistor.

Therefore, the auto answer mode switch 30 is switched by the "high" signal output from the output port AS of the MPU 50 to output the signal output from the emitter of the photocoupler PT to the ring signal of the MPU 50. Provided as input port (RIN).

In step 2-3, the MPU 50 that outputs the auto-response control signal starts scanning the ring signal input port RIN at a predetermined cycle in step 2-4 to search whether the ring signal is detected. When the 20HZ ring signal transmitted from the exchanger is input to the trunk line L1 and L2 while the MPU 50 is operating as described above, the ring signal input to the trunk line L1 is forwarded. One end of the ringer circuit 10 is input through the photodiode PD of the coupler PC, and the ring signal input to the trunk line L2 is directly input to the ringer circuit 10.

Therefore, the ringer circuit 10 reproduces the ring tone as an audible sound and outputs it through the speaker SP, and the light emitting diode PD inputting the ring signal emits light according to the ring signal period of 1 second per second. Therefore, the phototransistor PT receives " on " the light emitted from the light emitting diode PD, and thus a ring detector signal corresponding to the input ring signal is provided at both ends of the resistor R1 connected to the emitter terminal. Is output. At this time, the pulse-shaped ring detector signal is output to both ends of the resistor R1 connected to the emitter of the phototransistor PT because the 20HZ ring signal is output from the exchanger for 1 second and 2 seconds. 1 second high), 2 seconds off (2 seconds low).

The pulse-shaped ring detector signal shown at both ends of the resistor R1 is input to the ring signal input port RIN of the MPU 50 through the auto-response mode switch 30 switched on.

The MPU 50, which has received a pulsed ring detector signal across the resistor R1, determines that a ring signal is detected in steps 2-4 of FIG. Counting starts at -5, and the counting result is stored in the internal memory. In step 2-6, the MPU 50 counting the input ring signal searches whether the counting number corresponds to the number of rings stored in the internal memory. At this time, the number of rings stored in the internal memory determines how many times the ring signal outputted from the exchange is inputted and is set in the RAM area or the ROM area inside the MPU 50. The ring number setting of the internal memory may be set by the user in the internal RAM area by key selection of the key input circuit 40, and may be masked to a ROM in the MPU 50 from the time of production.

If the number of counting and the number of rings inputted to the ring signal input terminal RIN does not coincide with the number of rings set in the internal memory of FIG. 2 through FIG. 2-6, the MPU 50 jumps to the process of 2-5. The counting ring signal continues counting.

If it is determined that the number of ring counts is equal to the number of rings set in the internal memory, the MPU 50 recognizes the speakerphone function signal “high” as the output port (SK1-SK2) in steps 2-7. Output to the log switch (ASW) and speakerphone (80), respectively. At this time, the analog switch (ASW) is turned on by the input of the speakerphone function control signal "high", thereby connecting the trunk line current input to the trunk line (L1) (L2) to both ends of the speakerphone circuit (80).

On the other hand, the speakerphone circuit 80 is enabled by the MPU 50 speakerphone function signal "high" to form a loop of the trunk line current in FIG. 2-8, and amplify the voice signal carried on the trunk line call current. The voice signal is received by outputting to the speaker SPK, and the voice signal transmitted through the microphone MIC is amplified and transmitted to the trunk line L1 and L2.

When the user turns off the auto answer key of the key input signal 40, the auto answer control signal is not output from the output port AS of the MPU 50, so that the auto answer mode switch 30 is " off " Therefore, the ring signal input to the trunk line (L1) (L2) is input only to the ringer circuit 10 as described above is output only to the spaker SP.

As described above, the present invention provides a simple ring detector circuit and software to an existing speaker phone incorporating a microprocessor, and automatically establishes a call path when a ring signal sounds a predetermined number of times without a manual operation by a telephone user. There is an advantage that can make the phone upscale by sending a call.

Claims (1)

In the automatic answering method of a speakerphone having a microprocessor, a ring signal detecting process (2-1, 2-3, 2) outputs an answering mode signal when the answering mode signal is input and searches for and determines whether a ring signal is detected. -4) and counting the number of times of ring signal input when a ring signal is detected in the ring signal detection process (2-1, 2-3, 2-4) and comparing the counting number with the number of rings set therein. The ring counting comparison process (2-5, 2-6) and the ring counting comparison process (2-5, 2-6) to determine whether the same, when the comparison result is not the same in the ring counting comparison process (2-5, 2-6) 2-6), and repeats the process, and when it is determined that the comparison result is the same, a call loop forming process (2-7, 2-8) is formed to output a speakerphone function signal to form a call path. Automatic response of speakerphone.

Images