JPH03198456A - Automatic tone dial switching device - Google Patents

Abstract

PURPOSE:To release the trouble of manual switching caused by a switch and to prevent an erroneous operation caused by manual switching as well by detecting connection with a called party side and automatically switching an operation to a tone dial. CONSTITUTION:An automatic tone dial switching device 30 is composed of a hook interlock switch 22, which is changed over while being interlocked with a hook switch 2, and a control circuit 12 to input the signal of a terminal 2b and to output a switching signal to a tone/dial switching circuit 8. When switching from a state under call incoming side calling to a speaking state is detected, a tone dial switching signal is sent out to the tone/dial switching circuit 8 by the control circuit 12 and the tone/dial switching circuit 8 is automatically switched to the tone dial. Thus, there is no fail when reserving seats or collating the remainder of deposit by using a telephone set.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an automatic tone dial switching device for a push button telephone having two types of dialing methods, pulse dialing and tone dialing. The present invention relates to an automatic tone dial switching device that detects the start of a call and automatically switches from pulse dialing to tone dialing.

(Prior art) No special processing is required when communicating with the other party (human) using pulse dialing or tone dialing.
When communicating with a computer, such as making seat reservations or checking bank balances, it is only possible to use tone dialing.

When making seat reservations, etc. using a phone connected to a pulse dial line, the pulse dial will remain on until it is connected to the other party, and after the connection is made, the phone will have a slide or button switch installed on the phone. The system was configured so that seats could be reserved by switching to a tone dial.

(Problems to be Solved by the Invention) However, when using the above-mentioned prior art, there is a problem that the switching operation may be troublesome for the telephone user. There were problems in that the meaning of the act was not understood, and since it was not used often, people often forgot how to use it, and it was often used incorrectly.

By detecting connection with the other party and automatically switching to tone dial, the present invention eliminates the hassle of manual switching using a conventional switch, and prevents erroneous operations caused by manual switching. To provide an automatic tone dial switching device that eliminates the need for a tone dial.

(Means for Solving the Problems) The automatic tone dial switching device of the present invention is an automatic tone dial switching device for a telephone having a dialing system of pulse dialing and tone dialing, and is a tone dial automatic switching device for a telephone having a dialing system of pulse dialing and tone dialing. and a control means that receives the detection output from the detection means and sends a tone dial switching signal to the tone/dial switching circuit to switch the tone/dial switching circuit to the tone dial. It is characterized by:

(Function) In the tone dial automatic switching device of the present invention configured as described above, when the detecting means detects that the called party has switched from the ringing state to the talking state, the control means changes the tone dial switching signal to a tone dial switching signal. / is sent to the dial switching circuit, and the tone dial switching circuit is automatically switched to tone dial. This eliminates the possibility of failure when using a telephone to reserve a seat or inquire about a bank account balance.

(Example) The present invention will be explained below using examples.

FIG. 1 shows a block diagram showing the configuration of an embodiment of the invention, and FIG. 2 shows a block diagram of a control circuit in an embodiment of the invention.

(2) is a connection terminal, which is connected to the exchange equipment of the central office via a telephone circuit. The connection terminal 1 is composed of terminals 1a and 1b, and is used to apply DC voltage or to connect the handset 11.
When the handset 11 is placed in the normal position, a DC voltage of inverted polarity is applied, or an AC voltage is superimposed in response to lifting of the handset 11, dialing, incoming calls, etc.
Transmission of outgoing and received sounds or transmission of dialing signals are performed via ports a and 1b.

2 is a hook switch, and when the handset 11 is placed in the normal position, the contact 2a side (on-footer state) is placed, and when the handset is lifted, that is, when it is removed from the normal position, the contact 2b side ( (off-footer state).

The signal via the contact point 2a passes through the bypass filter 3 and only the AC bone, and the output from the bypass filter 3 is applied to the diode bridge 4 for rectification, and the rectified output is applied to the tone ringer circuit 5. Tone ringer circuit 5
While the output voltage from the diode bridge 4 is being applied, the built-in oscillator oscillates, causing the piezoelectric buzzer 6 to sound, and the piezoelectric buzzer 6 outputs a ringing tone. The oscillation output of the tone ringer circuit 5, that is, the tone ringer
The pulse output is supplied to a retriggerable monostable multivibrator 20, which will be described later, to trigger the retriggerable monostable multivibrator 20.

The signal input through the contact 2b is sent to the handset 11 via a diode bridge 7, a tone/dial switching circuit 8 which switches between pulse dialing and tone dialing in response to a switching signal, and a speech network circuit 10. 9 is a dialer circuit, which is a circuit for generating a pulse dial and a tone dial. The pulse dial signal from the dialer circuit 9 is sent to the connection terminal 1 via the tone/dial switch circuit 8 when the tone/dial switch circuit 8 selects the pulse dial side based on the switch signal. The tone dial signals of the nine dialer circuits 1 and 2 are passed through the speech network circuit 10, and when the tone/dial switching circuit 8 selects the tone dial side by the switching signal, the tone dialing signals are sent to the connection terminal 1 via the tone/dial switching circuit 8. will be sent to.

The above-mentioned push-button telephone has two types of dialing methods, normal pulse dialing and tone dialing, and allows communication with the other party (human being).

In addition to the above, one embodiment of the present invention is provided with a tone dial automatic switching device 30.

The tone dial automatic switching device 30 includes a hook interlocking switch 22 that switches in conjunction with the hook switch 2, and a control circuit 12 that inputs a signal from a terminal 2b and outputs a switching signal to the tone/dial switching circuit 8.

As shown in FIG. 2, the control circuit 12 has an output pulse width set by the voltage of a capacitor of a time constant circuit 21 consisting of a resistor and a capacitor, and is triggered by the rising edge of the tone ringer pulse output from the tone ringer circuit 5. A retriggerable monostable multivibrator (indicated by RMM in FIG. 2) 20 is connected between terminal 1b and contact 2b, and is connected to terminal 1a during off-hook.
Potential ■1. and the potential V 1 > of terminal 1b is V , , >
a photocoupler 17 that detects whether or not V, a;
A control unit 19 consisting of, for example, a microcomputer receives the output from the retriggerable monostable multi-bi break 20, the output from the photocoupler 17, and the output corresponding to the on-footer/off-hook state from the hook interlocking switch 22, and generates a tone/dial switching signal. It consists of In FIG. 2, 16 is a photocoupler 17
18 is a pull-up resistor that pulls up the collector of the phototransistor of the photocoupler 17 to the power supply.

Prior to explaining the operation of one embodiment configured as above,
The potential of terminal 1a and the potential of terminal lb will be explained.

In a telephone set, the potentials of terminals 1a and 1b change as shown in FIG. 5 depending on the state of the telephone set, as shown in the August 1987 issue of the magazine Transistor Technology. That is,
When the handset 11 is in the normal position on both the calling side and the receiving side, that is, in the on-footer state, the potential of the terminal 1a is at ground level, and the potential at the terminal 1b is -48V, as shown in FIG. 5(a).

When the handset 11 of the calling side telephone is placed in the off-footer state, the potentials of the terminal 1a and the terminal 1b are the same as in FIG. 5(a), as shown in FIG. 5(b).
The switching equipment sends a dial tone to the sending telephone. Below, the off-hook state is indicated by a broken line. Next, while the dial signal is being sent, the potential of the terminal 1a and the potential of the terminal 1b are the same as in the case of FIG. 5(b), but the dial signal is sent from the calling side telephone to the converter. While the called party is ringing, terminal 1 of the calling party's telephone is connected as shown in Figure 5 (C).
The potential of terminal a and the potential of terminal 1b are the same as in the case of FIG. As shown in (C), a ring tone is sent to the calling side telephone, a ringing signal is sent to the called side telephone, the tone ringer circuit 5 of the called side telephone is driven, and the called side The piezoelectric buzzer 6 of the telephone is made to sound. When the handset 11 of the receiving telephone is lifted and the telephone is ready for communication, the potentials of the terminals 1a and 1b of the receiving telephone return to their original states as shown in FIG. 5(d). Returning to , the transmission of the calling signal is stopped, and the potential of the terminal 1a and the potential of the terminal 1b of the transmitting telephone are reversed in polarity from the case of FIG. 5(C), and become as shown in FIG. 5(d). The sending of the ring tone is stopped.

After the call ends, the handset 1 of the calling and receiving phones
1 is returned to the on-hook state, the potential of terminal 1a and the potential of terminal 1b change from the state of FIG. 5(d) to the state of FIG. 5(a).
).

In other words, in the calling side telephone, the potential of terminal 1a is
．． and the potential of terminal 1b ■1. When the handsets of the calling and called telephones are both off-footer, the polarity is reversed from the potential in other cases, and V , , > V ,
, becomes the state. Also, on the receiving side phone, terminal 1a
The potential of the terminal 1b and the potential of the terminal 1b are inverted in polarity during reception of the call signal from those in other cases, and are in a state of V, b>V, .

Next, the operation of one embodiment of the present invention will be explained according to the flowchart of FIG.

First, the case of the calling side telephone will be explained.

It is checked whether the handset 11 is in an off-hook state (step S,), and if it is determined in step S1 that it is in an off-hook state, the potential of the terminal 1a is changed. It is checked whether the potential (Ib) of the terminal 1b is V, b>Vll (step S4), and it waits until it is determined that V, , > V +a. Whether V, b>V, . . . is checked depending on whether the output of the photocoupler 17 is approximately at ground potential. Note that since it is in an off-hook state, v,,=
V, b.

When it is determined in step S1 that the device is in an on-hook state, it is checked next to step S1 whether or not it is in an on-hook state (step S2).

When it is determined in step S2 that the on-hook state is present, it is checked whether the output of the retriggerable monostable multivibrator 20 is logic 1 or not following step S2. The output of the retriggerable monostable multivibrator 20 is triggered by a tone ringer pulse from the tone ringer circuit 5 shown in FIG. The logic is fl I II until then, and the logic II OII is maintained in other periods. This state is as shown in FIG. 4(b). However, since it is the transmitting side, the tone ringer pulse is not output, and in step S3 it is determined to be a logical IT OII. Therefore, step S2 is executed following step S3, and steps 32 to S3 are executed until it is determined that off-hook.
is repeated. If it is determined in step S2 that it is an off-footer, step S4 is executed again via step SL.

When the output of the photocoupler 17 drops to approximately the ground potential, it is determined in step S4 that V+b>V.

This is when the called party changes from a ringing state to a talking state. In other words, this is the state shown in FIG. 5(d) in which the handset of the called party's telephone is lifted up. If it is determined in step S4 that V, > V, then a tone dial switching signal is output from the control section 19 to the tone/dial switching circuit 8 (step S).

In response to this tone dial switching signal, the tone/dial switching circuit 8 is switched to tone dial mode.

Following step S5, wait until the on-footer state is reached (
In step S6), when the on-hook state is reached, the tone/dial switching circuit 8 is switched to a mode according to the instruction from the dial selector (step S7).

Accordingly, when the called party's phone is off-hook and a switch from ringing to a call is detected, the handset 11 of the called party's phone is raised and the call is dynamically switched to tone dial mode.

Next, the case of the receiving side telephone will be explained.

It is checked whether the handset 11 is in the on-footer state (step Sl).

Step S: When the on-footer state is determined by smell,
Following step S1, it is checked whether or not the footer is in an on-footer state (step Sz).

In the case of the terminating telephone, a tone ringer pulse is generated which causes the handset 11 to be lifted when the call is placed. Therefore, handset 11
is lifted after the retrigger monostable multivibrator 20 in step S3 issues an output of logic II I IT.

If it is determined in step S2 that the handset 11 is on-footer, following step S2, the output of the retriggerable monostable multi-byte break 20 is set to logic II.
1 n is checked.

When the tone ringer pulse is not supplied to the retriggerable monostable multi-by break 20, the output of the retriggerable monostable multi-by break 20 is logic Fl OI
I, step S2 is executed following step S3, and steps S2 and S are repeated until a call is made.

During this time a call is made and the output of the retriggerable monostable multi-bi break 20 becomes logic 911 IT.

As a result, following step S, it is checked whether or not the on-footer state is present (step SQ).

If it is determined in step S that the on-footer state is present, step S3 is executed following step S. Therefore, steps S and S are repeated while the piezoelectric buzzer 6 of the receiving telephone continues to sound and until the set time of the retriggerable monostable multivib break 20 elapses. If it is determined that the off-hook state has occurred during this repetition, following step S, a tone dial switching signal is output from the control section 19 to the tone/dial switching circuit 8 (step S5).

In response to this tone dial switching signal, the tone/dial switching circuit 8 is switched to tone dial mode. The input is the same as for the calling party's telephone.

Note that inquiries about deposit balances, seat reservations, etc. are performed from the transmitting phone, but the flowchart shown in Figure 4 can also be applied to the receiving phone. By providing a function that performs the actions shown in the flowchart shown in FIG. 2, there is an effect that there is no need to distinguish between those for the transmitting side and those for the receiving side.

(Effects of the Invention) As explained above, according to the present invention, it is possible to detect that the called party has switched from a ringing state to a talking state, and to switch the tone/dial switching circuit to tone dialing in accordance with this detection output. Therefore, when the called party switches from a ringing state to a talking state, it automatically switches to tone dialing.

As a result, without the need for a tone/dial switch, the condition of each input/output signal is determined and the mode automatically switches to tone dial when a call is established. No more confusion or mistakes when checking your balance. Furthermore, when the handset is put down, it returns to the normally set dial mode, so there is no risk of failure the next time the dial is made.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a block diagram of a control circuit in one embodiment of the present invention. FIG. 3 is a flowchart for explaining the operation of one embodiment of the present invention. FIG. 4 is a timing chart of generation of output pulses of a retriggerable monostable multi-by-break in a control circuit in an embodiment of the present invention. FIG. 5 is a state diagram showing the potentials of the lines on the calling side and the receiving side. 1... Connection terminal, 2... Hook switch, 3...
Bypass filter, 4 and 7... Diode bridge, 5... Tone ringer circuit, 6... Piezoelectric buzzer 8... Tone/dial switching circuit, 9... Dialer circuit, 10... Speech network circuit , 11・
...handset, 12...control circuit, 17...photo coupler, 19...control unit, 20...su) IJ gable monostable multi-pipe rake, 22...hook interlocking switch. Figure 1 2r1! J

Claims (1)

[Claims] An automatic tone dial switching device for a telephone having a dialing system of pulse dialing and tone dialing, comprising a detecting means for detecting a change from a called state to a talking state, and receiving a detection output from the detecting means. 1. A tone dial automatic switching device comprising: control means for transmitting a tone dial switching signal to a tone/dial switching circuit to switch the tone/dial switching circuit to tone dialing.