KR100191197B1 - Communication circuit in a keyphone telephone - Google Patents

Abstract

It is a circuit to improve the configuration and control of the switching network compared to the accommodating function in order to have a key confirmation tone providing transmission and reception separation control and additional functions in the key phone.

To this end, the handset transmitter (HS TX) of the handset transmitter, the speaker phone transmission (SPK TX) of the speaker phone circuit 40 and the hybrid receiver (HYB RX) of the call hybrid circuit 50 are connected to the first of the switching network 80. Connected to a third jitter (X1-X3), respectively, the hybrid transmitter 50, the hybrid receiver 50, the hybrid receiver 50, the handset receiver (HS RX) of the handset receiver, and the speakerphone circuit 40 of the speaker phone. The receiving terminal SPK RX is connected to each of the first to third ports Y1 to Y3 of the switching network 80 to switch only the basic communication path in the switching network under the control of the control means.

Therefore, it provides a variety of functions as a simple configuration and simple control of the switching network.

Description

Call circuit of a key-phone

1A and 1B are block diagrams of a call circuit of a conventional key phone.

2 is a call circuit diagram of a key-phone telephone according to the present invention.

3 is a diagram illustrating switching connection of the switching network 80 in FIG.

* Explanation of symbols for main parts of the drawings

10: key input unit 20: central processing unit

30: data transmission and reception circuit 40: speaker phone circuit

50: call hybrid circuit 60: speaker drive unit

70: speaker volume control unit 80: switching network

90: VMS circuit 100: microphone mute control

110: external speaker interface unit 130, 140: handset transmission and reception amplifier

150: display unit 160: inverter

The present invention relates to a key-phone telephone, and in particular, only basic communication paths are switched and connected as a switching network, and the paths of ring signals and tone signals can be directly connected to each other via a switching network. It is about a call circuit.

In the conventional telephone telephone, the call circuit is simply configured by using 4066, which is a general-purpose analog switch IC with four switches, as shown in FIG. 1A. In FIG. 1A, four switches SW1-SW4 correspond to the analog switch IC 4066. The switch SW1 is connected in parallel with the resistor R1 between the transmitting end SPK TX of the speaker phone circuit 4 and the transmitting end HYB RX of the call hybrid circuit 5 to control the transmission call path to the main apparatus. The switch SW2 is connected to the handset talker via the handset transmit amplifier 9 and the transmit end HYB TX of the call hybrid circuit 5 via the switch SW1 and the resistor R1 to control the handset transmit call path. . The switch SW3 is a receiving end SPK RX of the speaker phone circuit 4 interconnected with the handset receiver via the receiving volume control unit 8 and the handset receiving amplifier 10 and a receiving end HB RX of the call hybrid circuit 5. It is connected between the handset to control the incoming call. The switch SW4 is connected between the output terminal of the ring signal generating circuit 6 and the input terminal of the speaker driving circuit 7 interconnected with the speaker phone circuit 4 to control the speaker output path. Each of the switches SW1-SW4 is controlled by the central processing unit 2, and in particular, the switch SW4 must be equal to the speaker phone circuit 4 so that the inverter can be controlled by the speaker phone control signal of the central processing unit 2. Controlled by 12. In addition, the central processing unit 2 controls the key phone telephone as a whole by the key input of the key input unit 1 and the data transmission / reception with the main unit through the data transmission / reception circuit 23 to display the operation state on the display unit 11.

Although the call circuit of FIG. 1B is simply configured, the handset call or the speaker phone call cannot be controlled separately, and there is an inconvenience of not providing a key confirm tone.

Accordingly, as shown in FIG. 1B, the call switching network 15 is constructed by using two 4 × 4 cross point switch ICs, as well as ring signals, key confirmation tones, and various call progress tones (dial). Communication circuits have been used to switch the paths to provide tone, busy tone, redial tone, etc.). In FIG. 1B, the output of the address latch enable terminal ALE of the central processing unit 2 is divided as the divider 13 to provide the ring signal and the tone signal. Is applied to the switching network 15 as a key confirmation tone signal via the signal R2, and is applied to the switching network 165 as a traveling tone through the resistor R2, and the predetermined divided signal of the frequency divider 13 is varied. The volume is adjusted by the switch 14 and applied to the switching network 15 as a ring signal.

Therefore, call tone of ring signal and key confirmation tone signal as well as handset transmitter (HS TX, HS RX), speakerphone transmitter, receiver (SPK TX, SPK RX) and hybrid transmitter, receiver (HYB TX, HB RX). All signals are switched by the control of the central processing unit 2 in the switching network 15.

The call circuit of FIG. 1b has a function of providing a tone signal, transmitting / receiving separation control, etc., but has a disadvantage in that the switching network is complicated by configuring two 4 × 4 crosspoint ICs in two stages as compared to the additional functions. .

Accordingly, an object of the present invention is to provide a key phone telephone, in which only the basic call path is switched and connected as a switching network, and the ring signal and tone signal paths are directly connected to each other via the switching network, thereby simplifying the configuration and control of the switching network. In providing a telephone circuit.

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

2 is a call circuit diagram according to the present invention, wherein the key input unit 10 inputs the corresponding key data into the central processing unit 20 as a control means by pressing a dial key and a function key.

The switching network 80 is a 4x4 crosspoint switch IC, which is a handset transmitter (HS TX) through the handset transmit amplifier 140 and a speakerphone transmitter (SPK RX) of the speakerphone circuit 40 and the call hybrid circuit 50. A first-fourth junction (X1-X4) is connected to the hybrid receiver and the VMS transmitter (VMS TX) of the VMS (Voice Message Sending) circuit 90, respectively, and the call hybrid transmitter (HYB TX) and the handset. 1 to the handset receiving end (HS RX) of the handset receiver, the speakerphone receiving end (SPX RX) and the VMS recording end (VMS REC) of the speakerphone circuit 40 through the receiving volume control unit 120 and the handset receiving amplifier 130. Fourth ports Y1 to Y4 are connected to each other to control the first to fourth jitters X1 to X4 and the first to fourth ports Y1 to Y4 under the control of the CPU 20. Connect the switching.

The handset reception volume control unit 120 controls the sign language signal through the switching network 80 by the control to the central processing unit 20 and applies it to the handset receiver through the reception amplifier 90.

The CPU 20 transmits / receives data for performing various call functions with the main device through the data transmission / reception circuit 30 and the transformer T11, and transmits a ring signal to the terminal PA by receiving ring generation data from the main device. Is generated and applied to the speaker volume control unit 70. It is also connected to the microphone through the microphone mute control unit 100 and disables the speaker phone circuit 40 for speaker phone call in the handset call mode and enables it in the speaker phone call mode. Speakerphone control signal is applied to the speakerphone circuit 40. A key confirmation tone is generated from the key input unit 10 to the terminal PB by a dial key input and applied to the receiving amplifier 130.

The speaker volume controller 70 controls the volume of the ring signal and the output signal of the speaker phone circuit 40 and outputs the volume to the speaker SPK through the speaker driver 60.

The call hybrid circuit 50 is connected to the extension subscriber portion of the main apparatus through a transformer t11.

The external speaker interface 110 is a circuit for connecting to the external speaker through the transformer T13 and transmits the output ring signal of the central processing unit 20 and the output signal of the speakerphone circuit 40 to the external speaker.

The VMS circuit 90 is connected to the handset transmitter (HS TX) via the switching network 80 and is controlled by the central processing unit 20 for the voice message transmission service. The voice signal input and stored through) is generated to the VMS transmitter (VMS TX).

In addition, the switch SW11 connected between the terminal PB of the central processing unit 20 and the input terminal of the speaker driver 60 is an analog for applying a key confirmation tone to the speaker driver 60 in the speaker phone call mode. The switch is switched by the speakerphone call control signal of the central processing unit 20 inverted by the inverter 160. The switch SW11 may use a 4066 which is a general-purpose analog switch IC. The capacitors C12-C13 are for DC coupling, and the resistors R11-R14 are for level reduction of the signal.

3 is a diagram illustrating switching connection of the switching network 80 in the second diagram.

An operation example of FIG. 2 according to the present invention will now be described in detail with reference to FIG.

First, as shown in FIG. 2, the switching network 80 is constructed using a single 4x4 cross point switch IC, which is simplified. This simplification is due to the fact that there is a direct connection except for the main channel. The switching network 80 may use the CD22100BE of the United States HARRIS or MC142100CP of MOTOROLA.

Signals as shown in FIG. 3 are connected to the first to fourth jitters X1 to X4 and the first to fourth ports Y1 to Y4 of the switching network 80. Where P1-P16 represents each cross point.

As shown in FIG. 3, only the basic call is switched in the switching network 80, and the first-fourth jitters X1-X4 are configured only with signals flowing into the switching network 80, and the first-fourth The ports Y1 to Y4 consist only of signals flowing out of the switching network 80 so that a call path is formed by just one point switching.

In other words, only P1 and P7 points are connected for handset calls, only P2 and P11 points are connected for speaker phone calls, only P7 points are connected for handset mute, only P8 points are connected to the VMS signal, and VMS signals are connected to the speaker. It is easy to configure basic calls such as connecting only P12 ports, connecting only P4 points when outputting VMS signals to outside, and connecting only P13 points when recording VMS. Various signals related to the call are controlled to be directly connected.

In the case of the ring signal, only the speaker SPK and the external speaker need to be provided, and when the speaker signal is provided to the speaker, the signal generated by the central processing unit 20 is a ring signal attenuator composed of resistors R13 to R14. Through the capacitor (C3) and is input to the speaker volume control unit 70 and the external speaker interface unit 110. The speaker volume control unit 70 controls the volume of the ring signal and the speaker phone receiver terminal (SPK RX) signal and outputs it to the speaker (SPK), which is a problem even when used together because it is digitally controlled by the control signal of the central processing unit 20. There will be no. In the case of the key confirmation tone, the key confirmation tone signal generated by the central processing unit 20 is attenuated by the resistors R11-R12, since the key confirmation tone must be connected to the handset receiving end (HS RX) and the speaker receiving side and provided at a predetermined level. And via the capacitor (C12) to the rear end of the handset volume control unit 70, and through the analog switch (SW11) to be connected to the input terminal of the speaker drive unit (60). In this case, the analog switch SW11 is used to prevent the speaker from being heard by the speaker when a key confirmation tone is generated during the handset call.

At this time, since the speakerphone control signal is low active and the analog switch SW11 is high active, it is connected to the inverter 160 in the middle. In addition, the microphone (MC) signal is input to the speaker phone circuit 40 during the speaker phone call or connected to the speaker phone circuit 40 through the microphone mute control unit 100 for the speaker phone mute control.

In addition, the call extension tone provided in the conventional call circuit of FIG. 1b described above should be provided to all subscribers in the same tone, and in recent years, since the general telephone is also interlocked with the key phone system, the central processing unit 20 will provide it.

As described above, the present invention provides a simple configuration while performing various functions of the key phone by switching and connecting only a basic call using a single 4 × 4 crosspoint switch IC and directly connecting a ring signal and a tone signal. And controllability.

Claims (3)

A key phone, comprising: a control unit connected to a key input unit 10 and a data transmission / reception circuit 30 for controlling a call function by key input and data transmission / reception with a main device, and generating a tone signal and a ring signal, and a microphone ( A speaker phone circuit 40 connected to an MC) and controlled by the control means, a speaker hybrid circuit 50 for speaker phone calls, a call hybrid circuit 50 connected to an extension subscriber of the main apparatus, and a speaker for driving a speaker SPK. A loudspeaker volume controller 70 for controlling the volume of the output ring signal of the control means and the output signal of the speakerphone circuit 40 by the control of the control unit 60 and applying it to the speaker drive unit 60; Switching means for applying an output tone signal of the control means to the speaker driver 60 by a control signal of the control means for enabling the speakerphone circuit 40; A handset transmitter (HS TX), a speaker phone transmitter (SPK TX) of the speaker phone circuit 40 and a hybrid receiver (HYB RX) of the call hybrid circuit 50 are connected to the first to third jitters (X1-X3). Respectively, and connects the hybrid transmitter (HYB TX) of the call hybrid circuit (50), the handset receiver (HS RX) of the handset receiver, and the speaker phone receiver (SPK RX) of the speaker phone circuit (40). A switching network connected to the ports Y1 to Y3 respectively for switching between the first to third jitters X1 to X3 and the first to third ports Y1 to Y3 under the control of the control means; 80) a call circuit of a key-phone telephone. According to claim 1, wherein the VMS transmitter (VMS TX) is connected to the fourth jitter (X4) of the switching network 80 and the VMS recording terminal (VMS REC) is connected to the fourth port (Y4) to the handset transmitter ( And a VMS circuit (90) for recording a voice signal of HS TX) and applying the recorded VMS signal to the switching network (80). The apparatus of claim 1, further comprising an external speaker interface (11) O for applying an output ring signal of the control means and an output signal of the speaker phone circuit 40 to an external speaker through a transformer T13. Call circuit of key-phone telephone.