JPS6350147A - Dial signal sending-out device - Google Patents

Abstract

PURPOSE:To improve the operability by detecting a polarity inversion of a line, in case when the titled device is used in a pulse dial mode, and switching automatically said mode to a tone dial mode. CONSTITUTION:In case when dialing is executed, a phototransistor 11-2 is turned on, therefore, a pulse dial signal from a pulse dialer 7-3 is outputted to a speech network 6 and dialing is executed. Subsequently, when dialing is ended and a loop of a telephone line to the other party of dialing is formed (that is to say, the other party answers), the polarity of the telephone line is inverted, a phototransistor 11-1 is turned on, the phototransistor 11-2 is turned off, and a tone dial signal from a tone dialer 7-4 is connected to a speech network 6 instead of the pulse dial signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a dial signal sending device capable of sending pulse dial signals and tone dial signals.

[Conventional example]

In the case of conventional electronic telephones, various telephone services (
When using a pulse dial line (bank balance inquiry, various reservation services), after sending the recipient's selected number, switch the dial mode to tone dial mode using the switch on the telephone panel, and then switch to tone dial mode (DTMF). ) to send out PIN numbers and numbers for various services. As described above, there is a drawback in that after dialing, it is necessary to manually switch from pulse dial mode to tone dial mode.

〔the purpose〕

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dialing signal transmitting device that eliminates the drawbacks of the conventional example described above and that automatically switches from pulse dialing to tone dialing when a line loop is formed.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of this embodiment, where 1 is a diode bridge, 2 is a hook switch 0NHOOK-' closed, 0
Open with FFHOOK, 3 is 7'/oNHoo with Kushitsuchi
K opens, 0FFHOOK"?' closes. 4 is tone ringer, 15 is sounder, 6 is speech network, 7 is
is a dialer that can switch between pulse dial and tone dial, 8 is a keyboard, 9 is a resistor for current limiting, 1o
11 is a varistor for protecting the photocoupler, and 11 is a photocoupler for detecting polarity.

Next, in the above configuration, when 0FFHOOK is performed, the hook switch 2 opens and the hook switch 3 closes. The pulse/tone dialer 7 detects the reversal of line polarity after pulse dialing and automatically switches to tone dial mode.

Normally, in the case of 0NHOOK, switch 2 is closed so that a ringing tone is produced by a ringing signal from the line. When performing dialing, the telephone line is connected so that switch 2 is opened and switch 3 is closed, and at this time, phototransistor 11-2 is turned on and phototransistor 11-1 is turned off.

FIG. 2 is a detailed diagram of the pulse/tone dialer 7,
When performing dialing, the phototransistor 11-
2 is turned on, the pulse dial signal from the pulse dialer 7-3 is output to the speech network 6, and dialing is performed. Then, the dialing ends and a telephone line loop is formed with the dialing party (
(i.e., the other party answers) and the polarity of the telephone line is reversed,
The phototransistor 11-1 is turned on, the phototransistor 11-2 is turned off, and the tone dial signal from the tone dialer 7-4 is connected to the speech network 6 instead of the pulse dial signal.

Further, in the above embodiment, the dialer is switched according to the polarity reversal, but the means for switching from the pulse dial mode to the tone dial mode may be such that the mode is switched to the tone dial mode after a predetermined period of time has elapsed after the pulse dial mode.

〔effect〕

As explained above, in a dialing signal transmitting device that can switch between pulse dialing and tone dialing, when used in pulse dialing mode, in order to support various services in tone dialing mode, it is necessary to detect line polarity reversal. Automatically switching to tone dial mode has the effect of making operability easier.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the configuration of this embodiment. FIG. 2 is a detailed diagram of the pulse/tone dialer 7. 1 is a diode bridge, 2.3 is a hook switch, 4
is the tone ringer - 15 is the sounder, 6 is the speech network, 7 is the dialer, 8 is the keyboard, 9 is the resistor,
1o is barista, 11 is hotokabura.

Claims (1)

[Claims] a first sending means for sending out a pulse dial signal; a second sending means for sending out a tone dial signal;
and means for automatically switching from the first sending means to the second sending means after the loop is formed when a communication line loop is formed by the pulse dial signal from the sending means. Signal sending device.