JPS6273851A - Dial pulse recognition system - Google Patents

Abstract

PURPOSE:To improve the recognition accuracy by providing a signal recognition means detecting a signal sent from a signal generating means and recognizing a dial number. CONSTITUTION:In a supervimposed waveform C when a prescribed signal is applied during dial rotation, since the circuit of the sending side is opened at an open loop, the impedance is unmatched and the difference from the closed loop is made clear. A line signal appears at a terminal 1, a pulse detection section 3 and a signal generating section 4 are connected to a line section 2 and the pulse detection section 3 and the signal generating section 4 are connected to a control section 5 for control. Thus, the dial pulse detection section 3 and the signal generating section 4 are started at the start of recognition, a prescribe signal waveform superimposed on the dial pulse is utilized to allow the reception side to recognize surely the dial number. Thus, the recognition accuracy is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to data transmission using a telephone, and particularly to operating a dial-type telephone and transmitting a dial signal? The present invention relates to a system for inputting data by sending and receiving data.

[Conventional technology]

The popularity of telephones has been remarkable, and it can be said that they are used in almost every household in urban areas.

Machinery and electronics have also permeated various fields, and with the advancement of computer technology that makes effective use of semiconductor elements, various devices such as information processing and control equipment are now entering ordinary homes.

Therefore, there are attempts to organically combine a friend, such as a telephone, and a control device. In other words, it attempts to control indoor lights, cooking utensils, bathtubs, etc. from outside. This is what is called home automation, in which indoor lights and other lights are connected to a microcomputer control device that controls the binding ratio, and a telephone is also connected, and a person calls home at a suitable time from outside the home to activate the control device. After that, when you finish your errands and return home, the necessary work will have been done automatically.

However, in this case, as a data input means using a dial telephone, after the line is connected, the dial is turned, and the receiving side detects the dial signal to know the dial number.

That is, the rotation of the dial opens and closes the DC circuit, and an impulse response occurs at the time of this opening and closing. Since this impulse response is transmitted as an acoustic waveform over a telephone line, it is acoustically analyzed on the receiving side and rotated by counting the number of pulses and detecting the value of the next dial, that is, the dial number.

[Problem that the invention seeks to solve]

Conventional dial pulse recognition systems using dial-type telephones simply rotate the dial and recognize the signal waveform of the impulse response caused by the opening and closing of the DC circuit just in case, so the recognition accuracy does not improve and the input The drawback is that the reliability of the data decreases. For example, depending on the combination of conditions such as line connection status, such as when multiple links are passed through an exchange, it may be difficult to distinguish even if acoustic processing is performed.

[Elaborate means to solve problems]

The present invention is designed to include a signal generating means that applies a predetermined signal to dial pulses while the dial is rotating, and a signal recognizing means that detects nine signals sent from the signal generating means and recognizes the dial number. be.

[For production]

Rotation of the dial opens and closes the DC circuit, and when it becomes an open loop, the other circuit becomes an oven, resulting in an impedance mismatch. Therefore, it is advantageous to apply a predetermined signal in advance while the dial is rotating, and the difference between open loop and closed loop becomes noticeable, and the accuracy of dial pulse recognition increases.

〔Example〕

FIG. 1 shows a signal waveform of a dial pulse, which will provide a detailed explanation of the present invention. In the figure, (a) shows a signal waveform of a dial pulse, (b) shows a signal waveform of an impulse response, and (C) shows a signal waveform obtained by superimposing a predetermined signal on a dial pulse. That is, in (a), when the dial of the telephone is rotated to open and close the DC L path, the break b section, which is an open loop, and the make m section, which is a closed loop, are sent out sequentially during the total time T that indicates the dial number. Which indicates that.

(b) shows an impulse response seen when this DC circuit is opened and closed, and the ratio signal waveform excluding the DC component is transmitted to the receiving side through the line. Then, by counting the number of breaks b and finding the break time T, the rotary dial number is known. Here, if a signal is applied while the dial is rotating, there will be a large difference in the state between the open loop and closed loop of the DC circuit, and this difference can be clearly seen on the signal waveform, and we will use this. It is nine. In other words, (C) is a superimposed waveform when a predetermined signal is applied while the dial is rotating, and when the loop becomes open, the transmitting circuit goes into an open state, resulting in impedance mismatch and the closed loop. This shows that the difference between the times becomes clear.

FIG. 2 is a block diagram showing an embodiment embodying this principle, in which the I51 signal appears at the terminal 1, the pulse detection section 3 and the signal generation section 4 are connected to the line section 2, and the pulse detection section 3 is connected to the line section 2. The section 3 and the signal generating section 4 are connected to and controlled by the control section 5. Therefore, the dial pulse detection section 3 and the signal generation section 4 are started at the start of recognition. Then, by using a predetermined signal waveform superimposed on the dial pulse, the receiving side reliably knows the dial number.

〔Effect of the invention〕

The present invention makes it possible to improve recognition accuracy by applying a predetermined signal at the time of dialing, even when it is difficult to count the number of breaks due to line conditions, such as when the line goes through a few exchanges. .

[Brief explanation of drawings]

FIG. 1 is a signal waveform diagram illustrating the principle of the present invention, and FIG. 2 is a block diagram showing all specific examples of the present invention. 1...Terminal, 2...Line section, 3...Dial pulse detection section, 4...Signal generation section, 5...Control section.

Claims (1)

[Claims] A system for recognizing a dial number by detecting a signal generated when the dial of a dial type telephone is rotated, comprising a signal generating means for applying a predetermined signal to a dial pulse while the dial is rotating, and a signal generating means for transmitting a signal from the signal generating means. 1. A dial pulse recognition system comprising: signal recognition means for detecting a signal received by the user and recognizing a dial number.