JPS60100895A - Dial device - Google Patents

Abstract

PURPOSE:To make it possible to use a push-button dial with good operation for a low-cost rotary dial line by sending a rotary dial signal at the time of a dial before a call starts and sending a push-button dial signal at the time of the dial after the call ends. CONSTITUTION:When a subscriber operates the dial with the push-button dial (PB) 11, a numeral corresponding to the pushed button is read in a micro-processor 12. The processor 12 starts a PB sending circuit 8 according to AND conditions that an output terminal 6 is an earth electric potential and the PB11 is pushed down, and first closes a connect (b) and next, interrupts a connect (a) only for frequency equivalent to pushed-down numerals. When the dial ends and the other party responds, a communication condition is obtained. In the condition, direct current electric potentials of subscriber lines L1 and L2 at communicating side are inverted, at the subscriber line detection circuit 2 a photocoupler 3 is connected and an output terminal 4 becomes an earth electric potential. When the PB11 is pushed down under this condition, a processor 12 operates a PB sending circuit 9 and sends a PB signal equivalent to the circuit.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention automatically converts numbers, etc. input from a push button dial into a dial pulse (hereinafter referred to as DP) according to the state at that time.
This invention relates to a dialing device that converts the signal into a dial multifrequency tone (hereinafter referred to as FB) signal or a dial multifrequency tone (hereinafter referred to as FB) signal and sends it.

(Prior art) The dialing formats of telephones currently in use include DP and P.
There are two types of B. DP is a method of transmitting dialed numbers by intermittent direct current a number of times corresponding to the number of dialed numbers, and a rotary dial is used for the dial. PB converts dialed numbers, etc. to the corresponding audio band (
This is a method of transmitting a tone signal combining two frequencies (300H, 3400HK), and a push button dial is used for the dial.

Comparing the two, the PB (push button dial) is more convenient in terms of dial operability because it can be operated easily in a shorter time. Also, from the perspective of signal transmission, with DP, even if you try to use this to transmit numerical information between terminals or between a terminal and a center after a call has started, a carrier line will not be used in the transmission path. In contrast, PB cannot be transmitted because DC information cannot pass through it, whereas PB has the advantage that it can be easily transmitted because it uses a signal within the voice band.

However, from a usage fee perspective, PB lines are more expensive than DP lines, so if the main purpose is to make normal voice calls only and the phone is not used very often, DP lines are more expensive than DP lines.
(rotary dial) is more commonly used. Therefore, in order to improve operability, a dial device has been devised in which dial numbers input by operating a push button dial are converted into a DP multiplied signal and sent out.

However, although using this device makes dialing more convenient, it also transfers numeric information between terminals or between a terminal and a center after a call has started, such as in Shinkansen seat reservation services. Even if you try to do so, it is impossible.

[Purpose of the invention]

The purpose of the present invention is to improve such conventional inconveniences, and to convert numbers inputted from push button dials into D when dialing.
It is an object of the present invention to provide a dialing device which is excellent in both dialing operability and serviceability by transmitting a P-multiple signal and automatically converting and transmitting a PB signal after the start of a call.

[Summary of the invention]

In order to achieve the above object, the dialing device of the present invention includes a subscriber line state detection means for detecting the state of DC potential of the subscriber line, a dial pulse sending circuit, a tone signal sending circuit, and a dialing number inputting means. According to the AND condition of the output from the dialed number input means and the output from the subscriber line state detection means, the dial pulse sending circuit is activated before a call, and the tone signal sending circuit is activated after a call. It is characterized by having a control means that is driven to send out a signal corresponding to the input number.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a dial device showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the connection operation of FIG. 1.

A subscriber line connection terminal 1 in FIG. 1 is connected to subscriber lines L1 and L2 for DP signals. Subscriber i11! Ll.

In a normal state, the DC potential of L2 is 48 V, as shown in FIG. 2 (1). When the subscriber takes the receiver off-hook by making a call, the hook switch 7 shown in FIG. 1 is closed, and the subscriber line status detection circuit 2
, a loop is closed between the subscriber lines Ll and L2 through the communication circuit 10. As a result, a dial tone is sent from the exchange, but at this time as well, the DC potentials of Ll and L2 remain at Ll-10V and L2--48V, as shown in FIG. 2 (2). That is, the DC potential of Ll>DC potential of L2.

The subscriber line state detection circuit 2 shown in FIG. 1 is a circuit that detects whether the potential of Ll or L2 is in a high state. The figure shows an example in which photocouplers 3 and 5, which are a combination of a light emitting diode and a phototransistor, are connected in parallel so that the diodes are oriented in opposite directions, and are inserted in series in the line. Of course, for example, a method in which the potentials of Ll and L2 are directly compared using a humpator may also be used. For example, L
When l is at a higher potential than L2, the photocoupler 5 is conductive and the output terminal 6 is at ground potential; conversely, when L2 is at a higher potential than Ll, the coupler 3 is conductive and the output terminal 4 is at ground potential. However, until dialing (FIG. 2, 6)), the DC potential of L1>DC potential of L2, so the output terminal 6 is at the ground potential. The state of the DC potential of the subscriber lines Ll and L2 detected in this way is as follows:
The data is read into the microprocessor 12 under software control.

11 is a dial number input device, and the figure shows an example using a push button dial. Subscriber press button dial 1
When dial operation is performed from 1, the number corresponding to the pressed button is set to micro processor 1 by software control.
2. The micro pulse processor 12 closes the contacts in the dial pulse sending circuit 8 under software control based on the AND conditions that the output terminal 6 is at ground potential and the push button dial 11 is pressed, and the pressed digit is Contact & for the corresponding number of times 20 times 7 seconds or 10
intermittent at a rate of times/second. In this way, when dialing a call, a DP multiplier signal corresponding to the number pressed from the push button dial 11 is automatically sent out. Contact point D
When the r signal is sent out, it is restored.

When the dialing is completed, the exchange shifts to the operation in which the called party is ringing (see (4) in FIG. 2), and when the called party responds (see ())), the state becomes 1m in communication (see (6)).

In this state, the DC potentials of the originating subscriber, IJLl, and L2 are reversed and become Ll--48V, L2-100V, that is, the DC potential of L2>Ll, so the DC potential of In the subscriber line state detection circuit 2, the photocoupler 3 becomes conductive and the output terminal 4 becomes the ground potential. When the subscriber presses the push-button dial 11 in this state, the microprocessor 12 uses the AND condition that the output terminal 4 is at ground potential and that the push-button dial 11 is pressed to send the PB signal sending circuit 9 under software control. is driven and the corresponding PB times signal is sent out. As the PB signal sending circuit 9, a known circuit used in existing PB telephones can be used as is.

FIG. 3 is an operation flowchart of the microprocessor of FIG. 1.

When the pushbutton dial 11 is pressed, the pressed digit is stored in the memory (steps 21 and 22), and it is determined from the output of the subscriber line status detection circuit 2 whether or not a call is being made (step 23), whether or not the call is being made. Activate the dial pulse sending circuit 8, first close contact A, and then connect contact A a number of times corresponding to the memorized number (step 24.2).
6).

Further, if the output of the subscriber line state detection circuit 2 is in the post-call state, the PB signal sending circuit 9 is driven to send out a PB multiplied signal corresponding to the stored number (steps 23 and 25).
．． 27).

In this way, in the present invention, subscriber lines Ll, L
By detecting the state of the DC potential in step 2, the DP double signal is generated when dialing before the start of a call, and the PB signal is generated after the start of a call.
Since the double signal can be automatically selected and transmitted, it becomes possible to use push-button dialing on an inexpensive DP line, and it also becomes possible to freely transmit a PB signal during a call.

In the above explanation, an example was given in which a dial multi-frequency tone signal was used as the tone signal, but any signal that can transmit frequency information may be used.
For example, in addition to this, there are also single frequency signals and F S K (F
raquenay 5htrt Ksy4ng) signals can also be used, and in some cases, signals outside the voice band may be used. In addition, we have explained an example using a push button dial as a dial number input device.
Of course, it may be other than this.

〔Effect of the invention〕

As explained above, according to the present invention, the state of the DC potential of the subscriber line is detected, and when dialing before starting a call, the D.C.
Since the r signal and the FB signal are automatically sent when dialing after the start of a call, it is possible to use an easy-to-operate push-button dial on a low-cost DP line, and also to receive various services.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a dial device showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the connection state of FIG. 1, and FIG. 3 is an operation flowchart of the microprocessor shown in FIG. 1. 1; Subscriber line connection terminal, 2: Subscriber line status detection circuit, 3
: Photocoupler, 4: Output terminal, 5: Photocoupler, 6
: Output terminal, 7: Hook switch, 8! Dial pulse sending circuit, 9: PB signal sending circuit, lO2 call circuit, l
l+push button dial, 12: microprocessor. Patent Applicant Nippon Telegraph and Telephone Public Corporation 1゜', 'Te Representative Patent Attorney Masatoshi Isomura' 5, /, +q・,ノ

Claims (1)

[Claims] A subscriber line state detection means for detecting the state of DC potential of the subscriber line, a dial pulse sending circuit, a tone signal sending circuit, a dial numeral input means, an output from the dial numeral input means, and the above-mentioned subscriber line. Due to the AND condition of the output of the line status detection means, the above dialing and
1. A dialing device characterized by comprising control means for driving each of the tone signal sending circuits in the pulse sending outlet path in a state after a call has been made to send out a signal corresponding to an input digit.