JPS6384238A - Telephone set - Google Patents

Abstract

PURPOSE:To prevent a switching from being forgot without using a troublesome manual operation by changing over automatically into the pushbutton type when an incoming call reply operation is given after an outgoing call is applied by the dial pulse type. CONSTITUTION:In dialing at off-hook, the outgoing of dial pulse is continued during operation. A one-chip microcomputer detects the polarity inversion of a current conducted to the telephone line 2 through the end of dial operation. When the opposite party replies and the polarity of the current of the line 2 is inverted, the relation of 0, 1 of ports P12, P11 at off-hook is changed into the relation of 1, 0, then the level of port P01 goes to 1 and a switching signal 9 becomes a PB selection signal. The DP/PB changeover circuit 10 is switched automatically accordingly. In such a case, the telephone set circuit 3 and the PB control circuit are coupled to form a PB type reception circuit. Thus, the PB pushphone using service is offered automatically.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a dial-pulse (hereinafter referred to as DP) type telephone, and particularly to a push-button (hereinafter referred to as PB) type telephone after making an outgoing call in the DP type. Concerning improvements to telephones that enable reception.

(Prior Art) In recent years, it has become possible to reserve a seat in a vehicle or buy and sell stocks using a telephone. However, even in cases where conventional DP-type telephones are unable to receive such telephone services, and even if the service side is able to support DP-type telephones through voice recognition, This was inconvenient as there were many recognition errors and the response time was slow.

Therefore, recently appeared telephones that make a call using the DP method, call the other party, and then switch to the Pa method using a manual switch operation.

In this conventional OP/PB switching type telephone, the DP
After switching from the PB function to the PB function, the dial signal (Pa signal) is the same as that of the telephone, so it is possible to receive the above-mentioned services using the telephone.

However, it is troublesome to switch DP/PB each time by manual switch operation, and there is a high possibility that the switch may be forgotten.

(Problems to be solved by the invention) As mentioned above, in the conventional DP/Pa switching type telephone,
Since DP/Pa switching must be performed each time by manual switch operation, it is troublesome and there is a high risk of forgetting to switch. Therefore, in the past, many users considered switching their line contract from a dial-pulse type to a push-button type with a higher basic fee in order to receive a telephone service.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a dial pulse type telephone that automatically switches to a push button type when an incoming call response operation is made after making an outgoing call.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the telephone of the present invention provides a push-button method for receiving calls when a switching operation is performed after making an outgoing call using a dial pulse method. a telephone circuit in which the circuit is formed; a polarity reversal detection circuit that detects that the polarity of the current flowing through the telephone line is reversed when an incoming call operation is performed in response to a dial pulse type outgoing call from the telephone circuit;
The present invention is characterized by comprising a switching circuit that automatically switches the telephone circuit from a dial pulse type to a push button type receiving circuit in response to the detection output of the polarity reversal detection circuit.

(Function) In the telephone of the present invention, the telephone circuit is a dial pulse type, and when a switching operation is performed after an outgoing call, a push button type receiving circuit is formed.

After making an outgoing call from this telephone circuit, when the other party performs a response operation such as picking up the receiver, the polarity of the current flowing through the telephone line between the telephone of the present invention and the other party is reversed.

When the polarity reversal of the current flowing through the telephone line is detected by the polarity reversal detection circuit, the switching circuit that receives the detection output of the polarity reversal detection circuit automatically changes the telephone circuit from a dial pulse type to a push button receiving circuit. Because it switches,
It is possible to automatically receive a telephone service without manual operation by the user.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing the main structure of a telephone according to an embodiment of the present invention.

In the telephone 1 of this embodiment, transmission NIL1, L
The telephone circuit 3 connected to the telephone line 2 consists of a hook switch and a ringer (bell).

Although it is a normal telephone circuit including a microphone, a speaker, etc., a PB type receiving circuit is formed which is coupled to a Pa control circuit 7 in response to an automatic switching operation of a DP/Pa switching circuit 10, which will be described later.

In order to make it possible to form the PB type receiving circuit,
Dial key 4. DP/PB signal generator (for example, Toshiba's DTMF/PULSESWITCI-IAB
LE DIALERTC31041P etc.)5. DP control circuit (consisting of a diode bridge, etc.) for generating DP pulses6. In addition to a PB control circuit (consisting of an amplifier, a filter, etc.) 7 for generating a PB tone, a polarity inverting circuit 8 and a DP/PB switching circuit 10, which are the core of the present invention, are provided.

The polarity reversal detection circuit 8 detects that the called party has responded by detecting the polarity reversal of the current flowing through the telephone line 2.

The DP/PB switching circuit 10 receives the detection output of the polarity reversal detection circuit 8 as a switching signal 9, and upon receiving this switching signal 9, cuts off the connection state with the DP control circuit 6,
At the same time, it switches to the connection state with the PB control circuit 7,
These are relays, selectors, etc. that allow the telephone circuit 8 to be controlled by the Pa control circuit 7.

The details of the relationship between the polarity reversal detection circuit 8 and the DP/PB switching circuit 10 are schematically illustrated in FIG. 2.

In the configuration shown in FIG. 2, the polarity reversal detection circuit 8
, one transmission line L2 of the telephone line 2 is connected to a photocoupler 81, and the output of the photocoupler 81 is connected to the port PI1. of the one-chip microcomputer 82. Since it is set to join PI2, you can pick up the handset (not shown) of telephone 1 (off-hook), or the other party answers and connects to telephone line 2.
When a polarity reversal occurs in the current flowing through the circuit, the one-chip microcomputer 82 can detect this. These detection signals are sent from the port PO+ of the one-chip microcomputer 82 to the DP/PB switching circuit 10 as the switching signal 9.

Therefore, when the DP/PB switching circuit 10 receives the switching signal 9 indicating off-hook, it automatically switches to the DP control 7 side, and when it receives the switching signal 9 indicating polarity reversal, it automatically switches to the PB control 8 side. These situations will be explained in accordance with the flowchart in FIG. 4 while referring to FIG. 3.

Before going off-hook, no current flows through the telephone line 2, so the state is Pa1'' along with the boats PI2 and PI+.

When off-hook, current flows through telephone line 2 and the boat PI
2 and the same PT+ have the relationship (IIQII, l"1") (thus "1", 0") (step 401).Which one of these will happen is determined by connecting the terminal of telephone 1 to the transmission line L+ of telephone line 2, It depends on how to connect to L2. In this off-hook state, the boat PO+ is "o" and the switching signal 9 indicates the DP selection signal.

During this off-hook period, when the user performs a dial operation, dial pulses (DP) continue to be transmitted while the user performs the dial operation (step 403, negative), and when the user completes the dial operation (step 403, affirmative). , the one-chip microcomputer 82 starts detecting that the polarity of the current flowing through the telephone line 2 is reversed (step 404).
), the other party is not responding (No in step 405), and the detection of the polarity reversal is repeatedly performed.

When the other party answers and the polarity of the current flowing through the telephone line 2 is reversed (Yes at step 405), the boat P at the time of off-hook
O2 and PO+ are (“0”.

When the relationship is 1″), the relationship between the boat PO2 and the same PO+ is (1″, “O”), so the boat PO+
becomes Pa'1, and the switching signal 9 indicates the Pa selection signal.

For this reason, in the telephone vs1 of this embodiment, from the polarity reversal detection circuit 8 to the DP/PB switching circuit 10,
When the other party responds, the switching signal 9 sent to D
The P selection signal is switched to the Pa selection signal, and the DP/PB switching circuit 10 is automatically switched in response to this.

At this time, the telephone circuit 3 and the PB control circuit 7 are combined to form a PB type receiving circuit, so that the user can automatically receive the PB type button service.

[Effects of the Invention] As explained above, a telephone to which the present invention is applied automatically switches from the DP type to the Pa type when the other party answers, forming a Pa type receiving circuit. There is no need to perform the troublesome manual operation of P/Pa switching, and as a result, forgetting to switch can be prevented.

Therefore, a DP/PB switchable or P-type telephone can be made more useful.

Furthermore, the configuration of the telephone to which the present invention is applied can be applied to any terminal device that uses a telephone line, such as a personal computer.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of the main parts of a telephone according to an embodiment of the present invention, Fig. 2 is a circuit diagram schematically showing details of the main parts of the embodiment, and Fig. 3 is a polarity reversal diagram. FIG. 4, which is a diagram showing the detection mode of the detection circuit, is a flowchart showing the operation of one embodiment of the present invention. 1...Telephone 2...Telephone line 3...Telephone circuit 4...Dial key 5...DP/PB signal generator 6...DP control circuit 7...PB control circuit 8... Polarity reversal detection circuit 9...Switching signal 10...DP/Pa switching circuit

Claims (1)

[Claims] (1) A telephone circuit in which a push-button receiving circuit is formed when a switching operation is performed after an outgoing call is made using the dial pulse method, and an incoming call operation that responds to an outgoing call using the dial pulse method from this telephone circuit. a polarity reversal detection circuit that detects that the polarity of the current flowing through the telephone line has been reversed; and a polarity reversal detection circuit that automatically changes the telephone circuit from a dial pulse type to a push button type receiving circuit in response to the detection output of this polarity reversal detection circuit. What is claimed is: 1. A telephone set comprising: a switching circuit that switches automatically;