JPS62133893A - Signaling pulse transmission equipment - Google Patents

Abstract

PURPOSE:To improve the reliability of a signaling pulse transmission equipment by putting signaling pulses together at every one digit and reducing the occurrence of a malfunction caused by voice and noise, thereby converting them to signals that can be examined for errors in a receiving terminal. CONSTITUTION:Input signaling pulses are counted by the pulse counter 1 of a signaling pulse transmission equipment at every digit, and converted them to the tone signals of more than two waves having the frequency of a combination determined beforehand according to the counted number, and a DTMF generator 2 is driven. After converting them to the tone signals of more than two waves from the generator 2, every digit of the signals is transmitted to a transmission line, and every digit of transmitted tone signals are detected by a DTM receiver 3. It is regarded as ineffective when received input is only one wave or more than three waves, and output in which the combination of two waves continues for a fixed time is regarded as effective and applied to a pulse dialer 4. Thus, the reliability of a signaling pulse transmission equipment is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for transmitting signaling pulses for switching connections using a four-wire voice dedicated line.

Conventionally, such a device transmits a single tone with a specific frequency within the voice band intermittently according to the signaling pulse, and the receiving side rectifies and detects this to regenerate the original signaling pulse. It is publicly known.

Since the transmission line is usually used in conjunction with voice calls, this method has the disadvantage of a high malfunction rate due to ambient noise such as voice calls and music9 such as whistles and horns. In addition, methods have been put into practical use, such as a method in which two or more tones are intermittent at the same time instead of the single tone mentioned above, or a method in which intermittent pulses are transmitted as FM modulated waves, but both methods involve direct keying using manual pulses. Because of this, the duration of the signal element is short and sufficient guard cannot be applied on the receiving side, making it difficult to reduce the malfunction rate.

In order to eliminate such drawbacks, the present invention collects signaling pulses for each digit and converts them into a signal that is less likely to cause malfunctions due to voice and noise and that allows for error checking at the receiving end before being transmitted. The purpose of the present invention is to provide a highly reliable signaling pulse transmission device.

The present invention counts signaling pulses digit by digit at the transmitting end, converts them into tone signals of two or more waves having a predetermined combination of frequencies according to the number of signals, transmits them digit by digit, and then transmits the signals at the receiving end. The configuration is such that M signaling pulses are generated by detecting the M signal pulses.

To explain the present invention based on the drawings, in Fig. 14,
The human-powered signaling pulses are counted digit by digit by a pulse counter indicated by 1, converted to parallel signals such as BCD, and then converted to DTMF (Dual Tone Muti) indicated by 2.
Frequency) The generator is fully driven. This DTMF generator is the same as the one used in subscriber telephones called ``6 pushphones'', and has only one input.
,2. 9°0, one wave out of four predetermined low group frequency waves and one wave out of three high group frequency waves are output simultaneously. There is no harmonic relationship between these two waves, and the combination is such that voice and other noises are difficult to create a pseudo signal. Since the digit interval of the human-powered signaling pulses is set at a certain time or longer, the duration of the output dual tone can be sufficiently long.

The signal transmitted through the audio line is detected by a DTMF receiver shown at 3 and converted into a parallel DC signal such as BCD. This DTMF receiver is the same as the one used by the telephone office to support "one-button telephones", and it is disabled if the receiver's power is only one wave, or invalid if there are three or more waves, and the correct combination of two waves is fixed. The configuration is such that the output becomes valid only after a continuous period of time (guard time).

This output drives the pulse dialer shown at 4,
It is regenerating a signaling pulse similar to the one that entered the transmitting end input. This pulse dialer is also the same as that used in the "1st pseudo-button" telephone that connects to a rotary dial telephone line, and the output pulse rate can be selected, so the input at the transmitting end and the output at the receiving end can be selected. It becomes possible to connect with different pulse rates.

Although the case has been described so far in which both the transmitting end input and the receiving end output are signaling pulses, it goes without saying that either one may be a dual tone. If the tone frequencies and combinations in this case match those used in the transmission path, the configuration of the device will be simpler and simpler.

Also, if each digit is temporally divided into two time slots, and dual tones with different combinations are transmitted in the first half and second half, and one of them is used as a check code, the malfunction rate due to noise etc. is approximately the square of that of the 1-time slot transmission system, making it possible to construct a highly reliable device.

As explained above, the present invention provides a single signaling pulse.
To provide a device that greatly increases the reliability of equipment by converting and transmitting signals in units of digits that are unlikely to cause malfunctions due to voice and noise and that can be tested for errors at the receiving end. be able to.

[Brief explanation of drawings]

The accompanying drawings are block diagrams showing one embodiment of the signaling pulse transmission device of the present invention. 1...Pulse counter, 2...DTMF generator, 3...DTMF receiver 4...Pulse dialer

Claims (4)

[Claims] (1) Signaling pulses are counted digit by digit at the transmitting end, converted into two or more tone signals having a predetermined combination of frequencies according to the number, and transmitted digit by digit,
A signaling pulse transmission device characterized in that the signal is detected at a receiving end and the signaling pulse is regenerated. (2) The signaling pulse transmission device according to claim 1, wherein the transmitting end input signal is a tone signal of two or more waves having a predetermined combination of frequencies depending on the number of tone signals. (3) The signaling pulse transmission device according to claim 1, wherein the receiving end output signal is a tone signal of two or more waves having a predetermined combination of frequencies depending on the number of tone signals. (4) Each digit is transmitted as a composite of two or more tone signals with a predetermined combination of frequencies depending on the number and two or more tone signals with a different combination of frequencies. A signaling pulse transmission device according to claim 1.