JP2561456B2 - Button telephone device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a home-use button telephone device that can use a plurality of button telephones.

(Prior Art) A conventional key telephone device will be described with reference to FIG. FIG. 1 is a block circuit diagram showing an incoming call system of a conventional key telephone device. The key telephone device is composed of a main unit K connected to a central office line T / R and a plurality of key telephone sets Tel1 ,. . The main device K includes a call detection circuit C _i for detecting an incoming call from the office line, transmitting circuit D ₀ and the power supply unit D The incoming detecting circuit C _i is sending the signal data to each key telephone Tel1 ... Tel3
It consists of and. In addition, each button telephone Tel1 ... Te
l3 receives the signal data from the hook switch HS that closes the circuit when the handset (handset) is lifted, the telephone T1 that has the communication network and dial network connected to the central line T / R, and the above-mentioned transmission circuit D _0. Speaker control circuit D _i0
And the amplifier circuit AMP controlled by this speaker control circuit D _i0
It is composed of 1 and a speaker SP1 ...

The operation of the conventional key telephone device having such a configuration will be described.

When there is an incoming call from the central line T / R, the incoming call detection circuit C of the main unit K
_i detects this, and the signal data detected by the sending circuit D ₀ is placed on the power supply line and sent to each key telephone set Tel1 ... Tel3. The control circuit D _i0 of the button telephones Tel1 ... Tel3 detects the signal data sent through the power line, creates a station line ring tone, amplifies it with the amplifier circuit AMP1 ..., and generates the station line ring tone from the speaker SP1. Let

(Problems to be Solved by the Invention) However, in the conventional key telephone device, the main device K
Signal data that detected the incoming call from the curve on each button telephone
There is a problem in that a sending circuit D ₀ for sending to Tel1 ... Tel3 is required, and each key telephone set Tel1 ... Tel3 also needs a speaker control circuit D _i0 for receiving this.

Also, if you receive a call at the time of a power outage, each key telephone
Since the speakers SP1 ... of Tel1 ... Tel3 do not work, there is also a problem that it is necessary to install an additional bell in each button telephone Tel1 ... Tel3.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and an object of the present invention is to provide a button telephone device that does not require a sending circuit of the main device and does not require an additional bell to be installed in each button telephone even when a power failure occurs.

(Means for Solving Problems) In order to solve the above problems, the present invention provides each key telephone with an incoming call detection circuit for detecting an incoming call from a central line and an incoming call ringing circuit for notifying the incoming call. Is.

(Function) Since each button telephone is provided with the incoming call detection circuit and the ring tone ringing circuit, a circuit for notifying the main unit and each button telephone of an incoming call from the central line is unnecessary, and
There is no need to install additional bells that are needed during a power outage.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a system configuration diagram of a key telephone device according to the present invention, which is composed of a main unit K having a power source section D and three key telephone sets Tel1 ... Tel3.

FIG. 2 is a block circuit diagram of a key telephone, which is shown for one key telephone. This will be described below. The key telephone Tel1 includes an incoming call detection / ring tone ringing circuit C _i 1, a station / extension switching relay A and its relay contacts a1 and a2, a switching relay control circuit M1 for controlling the station / extension switching relay A, and a dial signal. Sending circuit D ₁ ,
Calling network t1, three hook switches HS1, HS2 and HS3 that close the circuit when the handset is lifted, station line key L
K, hold key HK, extension call key CK, signal transmission control device M2 for transmitting carrier burst signals and pilot signals outside the audible band, signal oscillation circuit OSC1 for carrier burst signals and pilot signals described above, voice band amplification circuit AMP
1, pilot signal reception and amplifier control circuit for receiving pilot signal and controlling the voice band amplification circuit AMP1
It is composed of R1 and.

FIG. 3 is a block circuit diagram of the main unit K, and the holding relay H ₀
And a relay contact h thereof, a holding relay control circuit M3, a line coupler current detecting photocoupler PH1, a carrier burst signal detecting circuit CD, a holding closing resistor R, and a power source section D.

FIG. 4 is a timing chart of the operation of the button telephone device configured as described above, and from the top, the carrier burst signal HKa, pilot signal CKa, operation S1 of the voice band amplification circuit AMP1 of another button telephone, and the office line call. The signal S2 and the operation S3 of the holding relay H ₀ are shown respectively.

For the key telephone device having such a configuration, the symbol Tel1
The operation of the key telephone shown in will be described as an example. Second
In the figure, when an incoming call is received from the central office lines T and R, the incoming call detection and ringing tone ringing circuit C _i 1 detects the incoming call, and the speaker SP 1
To alert you to an incoming call by ringing a ringtone.

When the station line key LK is inserted and the handset is lifted, the hook switch HS2 closes, the switching relay control circuit M1 operates, the station line / extension switching relay A switches the relay contacts a1 and a2 to the station line side, and the hook switch HS1 becomes Since the handset is closed by lifting, the telephone network t1 is connected to the office lines T and R, and the telephone having the above-mentioned telephone network t1 is in a call state with the office line.

Next, in order to call another key telephone, since the hook switch HS3 is closed by lifting the above-mentioned handset, when the hold key HK is inserted, as shown in FIG. 4, the signal transmission control circuit M2 and the signal oscillation circuit are shown. The carrier burst signal HK _a is sent by the OSC1 for the time t, and when the extension call key CK is pressed next, the pilot signal CK _a is sent while it is pressed.

When calling the extension in speech pilot signal CK _a pressing extension call key CK is sent by the power line H to other key telephone Tel2 and Tel3, (not shown) that pilot signal detection and amplifier control circuit R2, R3 When detected by, the voice band amplification circuit AMP1 of the other button telephones Tel2 and tel3 is turned on as shown in the timing chart of FIG. 4, and the voice signal on the power supply line H is amplified and sent from the speaker SP1. .

The operation of the main device K when the above hold key HK is inserted will be described.

The station line current detecting photocoupler PH1 of the main unit K detects that the station line is in a talking state and is turned on. Pending relay control circuit M3 detects the carrier burst signal HK _a sent when the hold key HK button telephone Tel1 were placed in a carrier burst signal detection circuit CD, to a hold relay contact h the state is ON. This state is shown by the correlation between the station line call signal S2 and the operation S3 of the holding relay H ₀ in FIG.

Since the handset of the called button telephone Tel2 or Tel3 is lifted and ready to talk to the central office line, when the hold key HK is returned, the hold relay H ₀ is activated to release the hold state.

The carrier burst signal detection circuit CD of the main unit K
Receives the output signal of the same signal oscillating circuit OSC1, but distinguishes the carrier burst signal HK _a from the pilot signal CK _a at time t, so even if the extension call key CK is accidentally pressed during a call with the station line, the hold relay H ₀ does not work.

In addition, extension telephone calls can be made only by the two button telephones raising their handsets, and the respective telephone call networks can make telephone calls through t1.

(Effects of the Invention) As described above, according to the present invention, since each key telephone is provided with the line incoming signal and the ringing tone ringing circuit, the speaker of each key telephone rings the ringing tone even during a power failure. To do. Therefore, there is no need for a circuit for detecting an incoming line and transmitting and receiving the incoming line to the key telephone.

The main unit is small because it is composed only of the power supply unit and the holding and closing circuit.

Further, the ringing tone of the line tone for each key telephone, which cannot be performed because the control of the line tone for the extension and the voice call for the extension line are the same, can be easily controlled.

Further, since the office line incoming call detection signal and the extension voice call signal are separately configured, it is possible to easily enter into a call state with the office line only by picking up the handset, and it is extremely easy to respond to the incoming call.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a button telephone device according to the present invention, FIGS. 2 and 3 are block circuit diagrams of a button telephone and a main device of the button telephone device of FIG. 1, respectively, and FIG. 4 is a timing of its operation. A chart and FIG. 5 are block circuit diagrams of a call reception system of a conventional key telephone device. T / R …… station line, K …… main unit, Tel1, Tel2, Tel3 …… button telephone, C _i …… incoming call detection circuit, D ₀ …… sending circuit, D…
… Power supply, HS… Hook switch, T1… Telephone, D _i0
...... Speaker control circuit, AMP1 ...... Amplification circuit, SP1 ...... Speaker, K ...... Main unit, C _i 1 ...... Incoming call detection and ring tone ringing circuit, A ...... Station / extension switching relay, a1 ...... Relay Contact, a2 …… Relay contact, M1 …… Switching relay control circuit,
D _i …… Dial signal transmission circuit, t1 …… Call circuit network, HS1,
HS2, HS3 …… Hook switch, LK …… Local line key, HK ……
Hold key, CK ...... extension call key, M2 ...... signal transmission control circuit, OSC1 ...... signal oscillator, AMP1 ...... voice band amplifier circuit, R1 ...... pilot signal reception amplifier control circuit, H ₀ ...
… Holding relay, h …… Relay contact, M3 …… Holding relay control circuit, PH1 …… Photocoupler for detecting station line current, CD …… Carrier burst signal detection circuit, R …… Resisting for holding and closing.

Claims (1)

(57) [Claims] 1. A main unit and a plurality of key telephones are connected in parallel to a central office line, and a plurality of key telephones are connected in parallel to a power line from a power source unit for extension telephone communication of the main unit. In the key telephone device, each of the plurality of key telephones has a circuit for ringing a speaker to notify an incoming call when an incoming call from the station line is detected, a dial signal sending circuit, and a station line when an incoming call is detected. When a key is operated and off-hook, a relay circuit for switching the communication circuit from the power line to the office line, a circuit for transmitting a carrier burst signal outside the audible band to the power line when the hold key is operated, and an extension call A circuit that sends out a pilot signal outside the audible band together with a voice signal to the power line when a key is operated, and detects the pilot signal when on-hook And a state in which the voice signal of the power supply line is amplified and output to the speaker, the main device is a circuit that detects whether the main line is in a call state, and the carrier burst signal. And a holding relay that holds the central office line in a holding state when a detection signal is output from these two circuits.