JPH0716215B2 - Button telephone device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a key telephone device.

2. Description of the Related Art FIG. 2 shows a conventional single telephone having a dial key or the like in a handset, and the handset 10 includes a microphone unit 11 for transmission, a receiver unit 12 for reception, and a hook switch 13 And dial keys 14 etc. are provided.

The handset 10 is connected to the telephone body 20 through a 4-core modular cord 15 composed of a 2-core call line and a 2-core hook switch signal line.

FIG. 3 is a block diagram of the single telephone shown in FIG. 2, and the handset 10 is the microphone unit (M) 11 described above.
Receiver unit (R) 12, hook switch (HS) 13,
In addition to the dial key 14, the dial sending circuit 15, the communication circuit 16, the modular code receiving section (E) 17 and the like are roughly configured.

On the other hand, the telephone body 20 includes a station line receiving circuit (I) 21, a speaker (SP) 22 for reproducing an incoming voice signal, a modular code receiving section (E) 23, and a station line modular code receiving section (G) 24. And the like.

Next, the operation of the above conventional example will be described.

First, in the case of an incoming call from a station line, the station line receiving circuit of the telephone body 20
When the handset 21 sends an incoming call tone through the speaker 22 and the handset 10 is off-hook, the hook switch 13 makes a call, and a call loop is formed via the office line, and the microphone unit 11, the receiver unit 12, and the call circuit 16 are connected. You can make a call via.

On the other hand, in the case of station line transmission, when the handset 10 is off-hook, the hook switch 13 makes a call loop through the station line, and when the dial key 14 is operated, the dial transmission circuit 15 causes the dial signal to be sent. The called party can be called by sending the call to the central office line.

Problems to be Solved by the Invention However, in order to realize a key telephone device with the above single telephone, it is necessary to equip the telephone main body 20 with a control microprocessor, a local line reception monitor sound reproduction device, and the like. In order to connect the handset 10 and the telephone body 20, a two-core office line, a two-core office line reception monitor audio signal line, and a two-core hook switch signal line are required, and are therefore standard. There is a problem that it is not possible to use the curled cord with four cores.

In view of the above problems, it is an object of the present invention to provide a button telephone device capable of connecting a handset to a telephone body via a 4-core curl cord.

Means for Solving the Problems In order to solve the above problems, the present invention outputs to a handset a communication circuit or the like, a means for detecting on-hook or off-hook with direct current, and an office line reception monitor signal as an alternating current signal. And a means for reproducing a station line reception monitor voice signal into voice, and a station line connected to the telephone body via the first two lines. Connected to the call circuit of the handset, the DC signal indicating the state of the hook switch of the telephone body is sent to the detection means of the handset via the second two lines, and the station line reception monitor AC signal is transmitted. It is characterized in that it is sent to the voice reproducing means of the telephone main body through the second two lines.

With the above configuration, the present invention can send the station line reception monitor signal and the signal indicating the off-hook state through the second two lines, so that the handset and the telephone body can be connected via the 4-core curl cord. Can be connected.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. First
FIG. 1 is a block diagram showing an embodiment of a key telephone device according to the present invention.

In FIG. 1, 30 is a handset, 40 is a telephone body, and the handset 30 and the telephone body 40 are connected via a 4-core curl cord 50 consisting of lines L _{1 to} L ₄ .

In the handset 30, 31 is a microphone unit (M) for transmitting, 32 is a receiver unit (R) for receiving, 33
Is a call circuit 34 having a transmission / reception circuit for making a call through a station line (TR) and a microphone mute circuit for preventing howling, and a dial key for inputting a dial number, 35 converts the dial number input via the dial key 34 into a dial signal and outputs it.
Further, it is a dial transmission circuit (D) having a key-in tone transmission circuit.

Further, in the handset 30, 36 is a transformer for monitoring the office line, 37 is a photo coupler (PHI) that is turned on during on-hook dialing and prevents howling, and 38 is a key-in tone when the dial key 34 is operated. It is a photo coupler (PH2) for doing.

On the other hand, in the telephone body 40, 41 is a control microprocessor (CPU), and 42 and 43 are telephone body 40, respectively.
Is a hook switch contact (HS1, HS2) interlocked with the operation of a hook switch (not shown) provided in the. When off-hook, the hook switch contact 42 is broken, and the hook switch contact 43 is grounded. Common contact is CPU31
And DC power supply (V _DD ) (NC contact side).

In the telephone body 40, 44 is a station line button switch (LK) that is turned on when a station line button (not shown) provided on the telephone body 40 is pressed, and 45 is a communication circuit 33 of the handset 30. Relays (A), a ₁ , a ₂ for switching station lines and extensions that operate when switching to station lines (TR) or extensions (HL)
Are relay contacts of the relay 45 for switching the extension of the office line, 46 are relays for off-hook (M) that operate during off-hook dialing, and m are relays for on-hook 46 that short-circuit both ends of the hook switch contact 42 during on-hook dialing.
Relay contact, 47 is an amplifier circuit (G) for monitor sound, 48
Is a speaker (SP) for monitor sound.

When the station line extension switching relay 45 is not operating, the relay contacts a ₁ and a ₂ connect the communication circuit 33 of the handset 30 to the extension line (HL), and the off-hook relay.
When 46 is not operating, its relay contact m opens both ends of the hook switch 42.

The call circuit 33 of the handset 30 is the line of the curl code 50.
It is connected to the local line (TR) side of the telephone body 40 via L ₁ and L _2, and the transformer 36 of the handset 30 and the input side of the light emitting part of the photocoupler 37 and the emitter of the light receiving part of the photocoupler 38 are curled. The curl cord is connected to the NO terminal of the hook switch contact 43 of the telephone body 40 and the DC power source (V _DD ) via the line L _{3 of the} cord 50, and the transformer 36 of the handset 30 and the output side of the light emitting portion of the photocoupler 37. It is connected to the ground side of the telephone body 40 via a line L ₄ of 50.

Next, the operation of the embodiment having the above configuration will be described for the case of on-hook dial operation.

When the station line button is pressed in the on-hook state, the station line button switch 44 is turned on, and the CPU 41 receives the detection signal from the station line extension switching relay 45 and the on-hook relay 46.
To work.

When the above-mentioned relays 45 and 46 operate, the relay contacts a ₁ and a ₂ switch the handset 30 to the office line (TR) side, and
The relay contact m short-circuits the hook switch contact 42, and the call circuit 33 has two lines connected to the local line (TR) side via the lines L ₁ and L ₂ of the curl cord 50.

At this time, since the hook switch contact 43 is broken, the DC component of the DC component is supplied from the DC power supply on the NO contact side through the line L ₃ of the curl cord 50, the light emitting portion of the photocoupler 37, and the line L ₄ of the curl cord 50. An electric current flows. The microphone mute circuit of the call circuit 33 turns off the microphone unit 31 by the detection signal from the light receiving portion of the photocoupler 37, and therefore,
Howling does not occur during the above on-hook dialing.

In addition, the dial tone from the central office line is transmitted as an AC component through the lines L ₁ and L _{2 of} the curl code 50, the reception circuit of the communication circuit 33 of the handset 30, the transformer 36, and the line L ₃ of the curl code 50 as an AC component. The signal flows to the amplifier circuit 47 of 40 and is reproduced as sound by the speaker 48.

When the dial key 34 of the handset 30 is operated in the above state, the dial sending circuit 35 dials the dial signal to the office line (TR) through the call circuit 33 and the lines L ₁ and L ₂ of the curl code 50. Is output.

At this time, the key-in tone sending circuit of the dial sending circuit 35 outputs the key-in tone signal to the light emitting portion of the photo coupler 38, and the transformer 36 sends the key-in tone AC signal to the DC on-hook on the lines L ₃ and L _{4 of the} curl cord 50. It is superimposed on the detection signal and reproduced as sound by the amplifier circuit 47 and the speaker 48.

Then, when the handset 30 is hooked off,
The hook switch contact 43 (and 42) of 40 makes, and the DC power supply current on the NC contact side of the hook switch contact 43 is the handset.
The light will not flow to the light emitting portion of the photo coupler 37 of 30. Therefore, the microphone mute circuit of the call circuit 33 is the microphone unit.
When 31 is turned on, a call through the central office line (TR) becomes possible.

In the case of normal on-hook dialing and incoming call, since the hook switch contacts 42 and 43 make up when off-hooked, a call is possible.

Therefore, according to the above embodiment, the call line is constituted by the lines L ₁ and L ₂ of the curl code 50, and the lines of the off-hook detection signal, the dial tone and the key-in tone are the lines L ₃ and L ₄ of the curl code 50. The handset 30 and the telephone body 40 are configured with the four-core curl cord 50
Can be connected via.

EFFECTS OF THE INVENTION As described above, according to the present invention, a hook switch is provided in the telephone main body, and in order to superimpose an office line reception monitor AC signal and a DC signal indicating an off-hook state on two lines and send them, a four-core system is provided. The handset and the telephone body can be connected via the curl code.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a button telephone device according to the present invention, FIG. 2 is an external view showing a conventional single telephone, and FIG. 3 is a block showing the single telephone of FIG. It is a figure. 30 …… Handset, 33 …… Call circuit, 34 …… Dial key, 35 …… Dial sending circuit, 36 …… Station line monitor transformer, 37, 38 …… Photocoupler, 40 …… Telephone body, 41…
… Control microprocessor (CPU), 42, 43 …… Hook switch contact, 44 …… Local line button switch, 45,46…
... relay, 47 ...... office line monitoring amplifier circuit, 48 ...... speaker, 50 ...... curl cord, L ₁ ~L ₄ ...... curled cord line.

Claims (1)

[Claims] 1. A dial key for dialing, a dial sending circuit for converting a dial number from the dial key into a dial signal and sending the dial signal, a call circuit, a means for detecting on-hook or off-hook by direct current, and a station. The telephone main body includes a handset having a means for outputting a line reception monitor signal as an AC signal, a hook switch, and a telephone main body having means for reproducing a station line reception monitor voice signal as voice, The connected office line is connected to the communication circuit of the handset via the first two lines, and the DC signal indicating the state of the hook switch of the telephone body is connected to the handset via the second two lines. And the station line reception monitor AC signal is sent to the voice reproducing means of the telephone body via the second two lines. .