JPH039669B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a control system for an auto-dial device that has a simple configuration and low power consumption. Figure 1 is a circuit configuration diagram of a conventional auto dial device, where DK is a disconnector, SA, SB, SC, and SD are switches for the disconnector DK, RA, RB, and RC are relays, and ra
is the contact of relay RA, rb is the contact of relay RB, rc ₁
~rc ₃ is the contact point of relay RC. Switches SA, SB, SC, SD are 1 to 2 each
If it is located at the side, the telephone TEL is connected to the office lines L1 and L2 and is ready to make and receive calls. On the other hand, if switches SA, SB, SC, and SD are on the 1st to 3rd sides, the phone TEL is L1 → SA _1-3 → rb _1-2 → rc2 _1-2 → rc1 _1-2 → SB _1-3
→TEL→SC _1-3 →rc3 _1-2 →SD _1-3 →L ₂ It is connected to the central office line and can make and receive calls. In other words, the former state allows the telephone TEL to make and receive calls regardless of the auto-dial function circuit depending on the switching state of the disconnector DK, and the latter state allows calls to be made and received in connection with the auto-dial function circuit. You can select the state. Next, we will explain how to make a call using the auto dial function. When making an auto-dial call, there are two ways to make a call: the handset of the telephone TEL is raised in advance, and the handset is lifted after confirming that the other party has answered, but in either case, the auto-dial call is In order to specify the storage location of the telephone number to be called, one button or a small number of buttons are operated on the keyboard switch. To do this, press the keyboard switch KZ and input a signal to the kz terminal of the microprocessor CPU, and the microprocessor CPU will relay the signal.
The operating signals of RA, RB, and RC are output, each relay operates, and a DC loop is closed through the station line in the next route. L1→SA _1-3 →ra→rb _1-3 →SD _1-3 →L2 Next, the microprocessor CPU sends the telephone number selected by the operation of the keyboard switch KZ to the central office line. , drives relay RA according to the number information. Relay RA contacts
ra is a contact point for sending out impulses, and is turned on and off according to the above number information, and dial pulses are sent out to the central office line side. Contacts _rb1-3 are shunt switches that short-circuit the audio pickup inductance L to cut off the monitor input. On the other hand, if the handset of the telephone was raised during this period and the handset was in the off-hook state, the microprocessor
Since air is input to the ho terminal of the CPU through the following path, the microprocessor CPU determines that it is off-hook. Chiki→rc1 _1-3 →SB _1-3 →Futsuku Switch HS→
SC _1-3 →rc3 _1-3 →ho When the microprocessor CPU determines that it is off-hook, it automatically switches on relay RA,
By restoring RB and RC, the central office line is restored to the TEL side of the telephone and calls are possible. In addition, in the on-hook state with the handset lowered, the foot switch HS is open and there is no air at terminal HO, so the microprocessor CPU determines that the handset is on-hook. When the microprocessor CPU determines that it is on-hook, the relay RA is activated after dialing is completed.
and RB is restored and relay RC continues to operate. As a result, L1→SA _1-3 →rb _1-2 →rc2 _1-3 →L→SD _1-3 →L
The central office line is connected to the voice pickup coil L through route 2, and contacts rb _1-3 are opened at the same time, so that the voice signals of the central line, such as the ring back sound and the answering voice of the other party, are transmitted to the amplifier.
It can be amplified by AMP and emitted from speaker SP for monitoring. When the caller picks up the handset at the appropriate time, the switch HS closes and the terminal ho is disconnected from the earth.Then, the microprocessor CPU issues a reset signal to the relay RC to restore it, and the contacts rc ₁ to _{rc 3} become 1-.
Switching to side 2, the telephone TEL is connected to the central office line.
Continuous contacts are used for relays RB and RC to avoid breaking the DC loop of the station line when switching. PO is the power source. As mentioned above, in the past, the logical operation of several relays was used to send out dial pulses and control switching between the telephone side and the auto-dial device side, which consumed a lot of power, and it was not possible to use battery-powered devices. It became unusable for a long time and we had no choice but to use commercial power. This resulted in an increase in the cost of the power supply circuit, etc., and was not suitable for miniaturization. In view of these points, the present invention attempts to obtain an auto-dial device with low power consumption by configuring a circuit with a reduced number of relays.
That is, semiconductor switches are used for the impulse switch and the shunt switch, and the circuit is composed of one self-holding type relay. The invention will now be explained in detail with reference to the drawings. FIG. 2 is a circuit diagram showing an embodiment of the present invention. DV is a disconnector, S1, S2, S3, S4 are switches for the disconnector DV, R is a self-holding relay, r ₁ ,
r ₂ and r ₃ are contacts of relay R, I is a semiconductor impulse switch, S is a semiconductor shunt switch,
HS is the switch, LA is the inductance for audio pickup, CPU is the microprocessor,
DB is a diode bridge. When switches S1 to S4 are set to the 1 to 2 sides, respectively, the telephone TEL is connected directly to the central office line as in the case of Figure 1, so calls can be made and received regardless of the auto dial function circuit. be. On the other hand, if switches S1 to S4 are turned on to the 1-3 side, the telephone TEL follows the following route: L1 → S1 _1-3 → r1 _1-3 → S3 _1-3 → TEL → S4
_1-3 →r2 _1-2 →S2 _1-3 →L2 The terminal is connected to the central office line and switched to a state in which it can make a call in connection with the auto-dial function, which will be described later, as in the conventional case. Next, automatic dialing in this state will be explained. The operation for making a call is the same as before. In other words, if you press keyboard switch K and input a signal to terminal k of the microprocessor CPU,
Since a driving pulse is output from the terminal Rop of the microprocessor CPU to the operating side winding A of the relay R, the relay R operates and holds itself, and the contacts r ₁ , r ₂ , r ₃
All 1-3 are closed L1→S1 _1-3 →r1 _1-3 →DB→I→LA→DB→S
2 _1-3 →L2 The DC loop through the central line is closed. In the next step, the microprocessor CPU controls the impulse switch I using the output from the terminal i to send a dial pulse to the central office line. While dial pulses are being sent, the microprocessor CPU closes the shunt switch S using the output from the terminal s, thereby cutting off the input to the audio pickup inductance LA. On the other hand, during this period, when the handset is raised and off-hook, the terminal h of the microprocessor CPU is exposed to earth air through the earth air path: h → r3 _1-3 → S3 _1-3 → HS → S4 _1-3 → r2 _1-3 → earth air. So the microprocessor
The CPU is determined to be in an off-hook state. When the off-hook is determined, the microprocessor CPU continues to close the shunt switch S after dialing is completed, and outputs a drive pulse from the terminal Rγei to the recovery side winding B of the relay R. The relay R releases its self-holding state and recovers, and the contact r ₁ , _r2 , and _r3 each return to the 1-2 side and can now talk. At this time, continuous contacts are used for contacts _r1 and _r2 so that there is no break in the central line. In addition, in the on-hook state when the handset is put down, the hook switch HS is open and the terminal h is not connected to the ground, so the microprocessor CPU determines that the hook is on, and no drive pulse is sent from the terminal Rγel, and the relay R
continues its operation, opens the shunt switch S after sending out the dial pulse, and receives the ringback sound, other party's response sound, etc. from the audio pick-up inductance LA, amplifies it with the amplifier AMP, and outputs the sound from the speaker SP for monitoring. When the caller lifts the handset at an appropriate time, the hook switch HS closes, and the terminal h is grounded. As mentioned above, the microprocessor CPU determines that it is off-hook, restores the relay R, and closes the contact r ₁ , r ₂ and r ₃ are 1-
Return to side 2 and use the telephone TEL to be able to talk. As explained above, according to the present invention, since the control relay R is one piece and is self-holding type, it is operated by a drive pulse and does not consume current during operation. Further, the impulse switch I and the shunt switch S are semiconductor switches and require little driving power. Therefore, the power capacity of the power supply is small and battery operation is possible.
This is also advantageous in reducing the size and cost of the power supply circuit.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional auto-dial device, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. DK, DK...Disconnector, SA~SD, S1~S4...Switch, RA, RB, RC, R...Relay, ra...Contact of relay RA, rb...Contact of relay RB, rc ₁ - rc ₃ ...
Contacts of relay RC, r ₁ to r ₃ ... Contacts of relay R, L,
LA...Inductance for audio pickup, CPU
...Microprocessor, K, KZ...keyboard switch, I...impulse switch, S...shunt switch, AMP...amplifier, PO, PL...power supply.

Claims (1)

[Claims] 1 Equipped with a disconnector to switch between connecting the telephone directly to the central office line or via an auto-dial device, and storing telephone numbers for multiple lines and storing the telephone numbers by pressing one button or a small number of buttons. In an auto-dial device whose function of sending a dialing signal corresponding to When the telephone is connected, an impulse switch consisting of a semiconductor switch is connected between the office lines through the contacts of a self-holding relay controlled by a microprocessor, and the impulse switch is connected between the contacts of the self-holding relay and the telephone's box switch. The obtained on-hook and off-hook state signals are input to the microprocessor, and the impulse switch is driven under the control of the microprocessor according to the telephone number selected by the button operation, and the impulse switch is driven according to the state signal. A control method for an auto-dial device characterized by controlling the on/off state of a semiconductor shunt switch connected in parallel with a voice pickup circuit.