JPH0321111Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a button telephone set that is used after being connected to a main unit of a key telephone device.

[Prior art]

Such button telephones (hereinafter referred to as telephones) are generally equipped with an audible signal generation circuit and a speaker, and generate touch tones in response to operations such as dial keys, and various ring tones and alarm sounds in response to control data from the main device. These audible signals are sent from the speaker for the operator to listen to, but depending on the installation conditions of the telephone or the operator's request, the transmission of these audible signals is stopped. .

However, in the past, the transmission of audible signals was determined by setting the circuit based on the order conditions at the time of manufacturing or by operating a specially installed switch, and it was difficult to change the setting using the former method, and the latter This method has drawbacks such as an increase in the number of parts, resulting in an increase in the required space and cost.

[Summary of the idea]

The purpose of this invention is to eliminate such drawbacks of the conventional ones at once. Focusing on the fact that modern telephones use control units with memory and operation keys such as dial keys, each operation key When you command the audible signal transmission stop mode by operating two specified keys at the same time, this mode is stored in the memory, and in response to the audible signal transmission request, the control unit refers to the contents of the memory and transmits the audible signal. To provide a highly effective button telephone set which stops sending out audible signals if a stop mode is stored.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing embodiments.

FIG. 1 is a circuit diagram of a telephone set. Line terminals TT ₁ and TT ₂ , which are connected to the main equipment (not shown in the figure) through a pair of communication lines, include a switch HS ¹ , a diode bridge DB, and a dial circuit DIC. The communication circuit TKC is connected through the off-hook, and the DC loop is closed by the communication circuit TKC through the off-hook.
Dial circuit that operates using loop current as a power source
It is possible to make dial calls using the DIC and to make calls using the transmitter T and the receiver R.

However, the dial circuit DIC is a photocoupler.
It is controlled by the photodetector transistor of the PC.
It becomes operational only during a power outage of the commercial power supply used by the main device as the main power source.

In addition, a capacitor C1 is connected to the line side of the diode bridge DB via a hook switch ^HS2 .
Tone ringer TRG via 01 and resistor R ₁₀₁
are connected as a bridge, and in the event of a commercial power outage, the power is activated in response to the arrival of a calling signal from the connected central office line, generating a ringtone, and then connecting the transformer.
T ₁₀₁ and the speaker via contact pf ² of relay PF
A transformer T ₁₀₂ is provided, which is adapted to supply and drive the SP and is likewise connected via a contact pf ⁰ and a capacitor C ₁₀₂ , by means of which the audio signal is extracted and the switch is activated. It is applied to amplifier A via circuit SW ₁₀₁ and potentiometer RV ₁₀₁ , where it is amplified and then connected to capacitor C _103.
and a contact pf ² to drive the speaker SP.

On the other hand, the line terminals TS ₁ and TS ₂ connected to the main device by a pair of signal lines are connected to a transistor Q ₁₂₁ and a resistor R ₁₂₁ via a diode D 121 for blocking application of reverse polarity and a blocking wire _CH . , capacitor C ₁₂₁ , C ₁₂₂
A stabilizing circuit with a constant voltage diode ZD ₁₂₁ is connected, and this stabilizes the DC power supplied from the main device to a local power supply of +12V, supplies it to each necessary part, and integrates its output. The local power supply is further stabilized to +5V using a circuitized stabilization circuit REG, smoothed by a capacitor C ₁₂₃ , and then supplied to each necessary part. It is designed to operate with +5V power supply.

Note that the terminal voltage of a capacitor C ₁₂₄ charged by the local power supply +5V is connected to the reset terminal RST of the control unit CT via a resistor R ₁₂₂ to which a diode D ₁₂₂ for rapid discharge is connected in _parallel . The terminal voltage rise delay of capacitor _C124 , which occurs when DC power supply starts, is used as an "L" (low level) reset pulse, and the control unit CT is reset and initialized accordingly. ing.

In addition, a capacitor is connected between line terminals TS ₁ and TS ₂ .
C ₁₂₅ , C ₁₂₆ , resistor R ₁₂₄ ~ R ₁₂₉ , diode D ₁₂₃ ,
D ₁₂₄ , transistor Q ₁₂₂ , inverter IN ₁₂₁ , input inversion type OR gate G ₁₂₁ , and NAND gate
A receiving circuit with G ₁₂₂ is connected, and _{an inverter IN 122 and} a resistor R ₁₃₁ ~
R ₁₃₅ and a transmitting circuit consisting of transistors Q ₁₂₃ and Q ₁₂₄ are connected, and transistor Q ₁₂₂ is turned on in response to a pulse-like drop in the line voltage Vs in response to control data transmission from the main device, thereby preventing collector current from flowing. Therefore, if the terminal voltage of resistor _R126 becomes "H" (high level), the output of inverter IN ₁₂₁ becomes "L".
Now, the charge on the capacitor C ₁₂₆ , which has been charged through the diode D _{124 ,} is discharged through _{the resistor R 127 and} the output impedance of the inverter IN ₁₂₁ . capacitor C ₁₂₆ depending on the time constant determined mainly by
Since the terminal voltage of the capacitor drops to "L", noise components are removed by this time constant, and the capacitor
The terminal voltage of C ₁₂₆ is set to “L” through resistor R ₁₂₈ .
When applied to one input _of OR gate _G121 , a flip-flop circuit ( _hereinafter referred to as
FFC) FF is set, and “L” control data is sent to the port terminal P1 of the control unit CT via the resistor _R129 .
given to 0.

When the control unit CT confirms the control data, it changes the port terminal P6 to "L" and resets the FFC and FF, thereby preparing to receive the next control data.

Furthermore, if port P7 is pulsed to "L" in accordance with the operation data, the output of inverter IN ₁₂₂ becomes "H", which turns on transistor Q ₁₂₃ and turns on transistor Q ₁₂₄ as well.
A resistor R ₁₃₅ is connected between the line terminals TS ₁ and TS ₂ via a diode D ₁₂₁ to reduce the inter-line impedance of the signal line _LS , thereby transmitting the operation data.

As described above, the transmission and reception of signals indicating each data with the main unit KSU is performed by pulse signals, but the switch HS ³ is connected to the port terminal P8 of the control unit CT, and the input terminals K0 to K3 are
Along with the keyboard KB output is connected,
The scanning input of the keyboard KB is connected to the output terminals S0 to S3 via diodes _D151 to _D154 , and the local power supply + is connected via a pull-up resistor r.
Each terminal P8 to which 5V is applied and becomes “H”,
Off-hook is detected by P8 among K0 to K3 becoming "L" in response to turning on of the hook switch ^HS3 , and the output terminals S0 to S0 to K3 are detected at a predetermined period.
S3 is sequentially set to "L" and scanning is performed, and accordingly, it is checked whether the input terminals K0 to K3 have become "L", and the dial keys *, #, 1 to 9, connected in a matrix are pressed. 0 and speaker key
It detects that the Ks, hold key _KH , and central line keys _KL1 and _KL2 are turned on, and according to these operating conditions, the operation data is encoded and transmitted as a transmission signal as described above.

Furthermore, a transistor Q ₁₅₁ is connected to the output terminal S4 via a resistor R ₁₅₁ , and the output terminals S1 to S3
Transistors Q ₁₅₂ to _{Q 154} are connected to the circuits of resistors R ₁₅₂ to R ₁₅₇ , respectively, and the keyboard
The timing is separate from the scan over the KB, so
Output terminal S4 is set to "L", transistor Q ₁₅₁ is turned on, and local power supply +5V is applied to light emitting diodes LD ₁₀₁ and LD ₁₀₂ corresponding to central line keys K _L1 and K _L2 and light emitting diode LD ₁₀₃ corresponding to speaker key K _S. When applied, the output terminal S1 is output according to the control data.
~If S3 is “L”, transistor Q ₁₅₂ ~
Q ₁₅₄ is turned on, and the light emitting diodes LD ₁₀₁ to _{LD 103} emit light due to current passing through the resistors R ₁₅₈ to R ₁₆₀ .
Continuously visible light emission from the diodes LD ₁₀₁ and LD ₁₀₂ indicates capture of the first or second station line, similar intermittent light emission indicates capture of the first or second station line, and similar continuous light emission from the same diode LD ₁₀₃ indicates capture of the first or second station line. Depending on the light emission, the reception and amplification status of the speaker SP is displayed.

On the other hand, port terminals P5, P
1, when P0 is set to "L", each of the switch circuits SW ₁₀₁ to _{SW 103} is turned on, and depending on the "L" of port terminal P4, the transistor
A switching circuit consisting of Q ₁₇₁ , Q ₁₇₂ and resistors R ₁₇₁ to _{R 174} is driven, and when transistor Q ₁₇₂ is turned on, transistor Q ₁₇₁ is also turned on, and local power supply +12V is supplied to amplifier A, making it operational. .

Also, inverter IN ₁₇₁ ~ IN ₁₇₄ , resistor R ₁₇₅ ~
Oscillator that generates tone signals of different frequencies using R ₁₇₈ and capacitors C ₁₇₁ and C ₁₇₂ .
OSC ₁₀₁ and OSC ₁₀₂ are configured as an audible signal generation circuit, and NOR gates G ₁₇₁ and G ₁₇₂ are turned on by “L” of port terminals P2 and P3, and the tone signal passes through them, and the input inversion type is of
Pass through AND gate G ₁₇₃ and switch circuit SW ₁₀₂
When the switch circuit SW ₁₀₃ is on, it is applied to the amplifier A through the resistors R ₁₇₉ and R ₁₈₀ , and the low level drives the speaker SP.
It is fed to amplifier A only through R ₁₇₉ and drives speaker SP with a high level.

Furthermore, depending on whether switch circuit SW ₁₀₁ is turned on,
The central office line ringtone, the ringtone from the doorbell, the voice ringtone, the received voice, etc. sent from the main device via the telephone line are emitted from the speaker SP, and the switch circuit
If SW ₁₀₂ or SW ₁₀₃ is turned on and NOR gate G ₁₇₁ is turned on, the hold alarm sound, unhooked alarm sound, alarm sound corresponding to the alarm signal AL, etc. will be emitted from the speaker SP, and the NOR gate G will be emitted in the same way. If you turn on ₁₇₂ , the touch tone, extension ringtone, etc. when you operate each key on the keyboard KB will be heard on the speaker.
If the NOR gates G ₁₇₁ and G ₁₇₂ are turned on at the same time, the busy ringtone will be emitted as well.

However, the difference between each emitted sound is NOR gate G ₁₇₁ ,
It is determined by changing the on/off period of G ₁₇₂ and setting the intermittent status.

In addition, terminals M, G, +, - are pulled out for connection to an external loudspeaker system, and a local power supply of +12V is supplied via resistor _R191 .
A switching circuit consisting of R ₁₉₂ , R ₁₉₃ and transistor Q ₁₉₁ controls the power supply return path, and the output terminal S
When Q7 is set to "L", the transistor _Q191 is turned on and the external loudspeaker is put into operation.

In addition, the output terminal S6, which maintains "H" while the local power supply +5V is being supplied, is connected to the input of the inverter IN ₁₇₅ , and when the commercial power is energized on the main device side, the output of this becomes "L" and the resistor ware R ₁₉₄ ,
Turn on the transistor Q ₁₉₂ through the circuit of R ₁₉₅ ,
The surge absorbing diode D ₁₉₁ operates the relay PF connected in parallel, and the light emitting diode of the photocoupler PC is energized via the resistor R ₁₉₆ , and its light emission turns on the light receiving transistor of the photocoupler PC, and the dial is turned on. The operation of the circuit DIC is stopped.

In addition, according to the operation of relay PF, contact pf ⁰ is on and contact pf ² is in a state to select the output of amplifier A, and when switch circuits SW ₁₀₁ to _{SW 103} are turned on, speaker SP is driven as described above. On the other hand, if relay PF is restored due to a commercial power outage, contact pf ⁰ will turn off and contact pf ² will turn off the tone ringer.
The TRG output is selected, and the speaker SP is driven only in response to an incoming call from the central office line directly connected to the main device, and the dial circuit is activated in response to the light-emitting diode of the photocoupler PC going out. When the DIC becomes operational and you operate the dial key on the keyboard KB after off-hook, a separate contact provided on it turns on and sends out a dial signal in the form of a pulse signal or composite audio frequency signal. You can also freely make and receive calls to and from central office lines.

Tazushi, dial circuit DIC, tone ringer
TRG, relay PF, and their peripheral circuits are
It may be provided only in a power outage telephone that is connected to a central office line during a commercial power outage.

In a telephone configured as above, dial keys *, #, 1 to 9, 0 and each key
Among the operation keys W _S , K _H , K _L1 , and K _L2 , two specified keys are designated for commanding the audible signal transmission stop mode, and in this example, the hold key K _H and the dial key The transmission stop mode is set by operation.

Figure 2 is a flowchart of the control status by the processor in the control unit CT, and shows the above-mentioned key words.
"Key detection" 101 is performed by scanning the KB, and if "Key operation?" 102 is YES, "simultaneous key operation?" 103 is YES, and "specific key" simultaneous operation? “Judging 111, this is
If YES, “audible signal transmission stop mode setting”
112, this flag is stored in the memory in the control unit CT.

Note that if step 111 is NO, "process as simultaneous operation error" 121 is performed, and it is determined that an erroneous operation has occurred.

On the other hand, in response to NO in step 103, "set operation data for key detection" 131 stores the operation data corresponding to the operated key in the memory and prepares to send it to the main device, corresponding to step 112. By referring to the flag, it is determined whether "audible signal transmission stop mode setting?" 132 is selected, and if this is NO, the touch tone is transmitted by "audible signal transmission" 133, whereas in response to YES in step 132, step 133 is executed. omitted, and no audible signal is sent.

The flag in step 112 is referred to by the processor in response to all audible signal transmission requests including control data, and while the flag is being set, all audible signal transmission by the speaker SP is stopped.

Also, if you need to release this state,
Step 112 is performed by performing the same operation again, etc.
The flag may be reset.

In addition, the flag set in step 112 is also sent to the main device when the operation data is sent, and is also stored in the memory within the main device, and this memory is backed up by a battery. Therefore, the contents are retained even in the event of a commercial power outage, and the contents of the memory are transmitted as control data when the commercial power is turned on.
This is stored in the memory in the control unit CT as in step 112.

Therefore, once both keys K _H and * are operated at the same time, the transmission of audible signals by the speaker SP is stopped, and the same state is set without repeating the operation even after a power outage.

However, the types of keys to be operated simultaneously and the types of audible signals to be stopped can be selected depending on the situation, and depending on the conditions, a separate power source may be used. The same holds true even if the transmission stop mode setting is not transmitted to the main device, and various modifications are possible, such as the control unit CT being configured by a combination of various logic circuits.

[Effect of idea]

As is clear from the above explanation, according to the present invention, it is possible to arbitrarily stop the transmission of audible signals without installing any special parts or making any settings on the circuit. This results in a reduction in costs and costs, and provides great benefits in various button telephones.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 is a circuit diagram of a telephone set, and FIG. 2 is a flowchart of a control situation by a processor in a control section. KB……Keyboard, *, #, 1~9,0……
Dial key, K _S ... Speaker key, K _H ......
Hold key, K _L1 , K _L2 ... Office line key, CT ... Control unit, OSC ₁₀₁ , OSC ₁₀₂ ... Oscillator, G ₁₇₁ , G ₁₇₂ ...
...OR gate, SW ₁₀₂ , SW ₁₀₃ ...switch circuit,
A...Amplifier, SP...Speaker.

Claims (1)

[Claims for Utility Model Registration] A button that is equipped with a plurality of operation keys and an audible signal generation circuit, and in response to an audible signal transmission request, the audible signal generated by the generation circuit is transmitted for the operator to hear. In the telephone, a detection means for detecting that two specified operation keys among the plurality of operation keys are operated at the same time, and when the detection means detects that the two specified operation keys are operated at the same time. , a memory for storing transmission stop mode data for stopping transmission of the audible signal; and a memory for storing transmission stop mode data by referring to the contents of the memory when a transmission request for the audible signal is made. and control means for stopping the transmission of the audible signal when the button telephone is in use.