JPS60251746A - Communication method - Google Patents

Abstract

PURPOSE:To attain high-speed communication by transmitting a pulse of a prescribed level having different length in response to the combination of a prescribed number of digital signals. CONSTITUTION:Computers C1, C2 are connected via acoustic couplers M1, M2 and a telephone line 1 to transmit/receive digital signals of high/low levels. Four kinds of combinations of high/low (a), high/high (c), low/low (e) and low/high (g) are obtained from 2 bits of the digital signal, the acoustic couplers M1, M2 convet them into four kinds of pulses b, d, f, h of prescribed level but different length and transmit the result. The pulses are converted into digital signals of high/low levels at reception. Thus, the transmission speed is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a communication method, and more particularly, to a communication method that is effective when using a line with a limited transmission speed, such as a telephone line.

[Background of the invention]

For example, when transmitting digital signals using an acoustic coupler, the transmission speed of the acoustic coupler is up to 1200 bits/
It is limited to about sec. This is mainly due to the characteristics of the central office exchange. However, there is a strong demand for higher density communication information, and higher transmission speeds are desired.

[Purpose of the invention]

The present invention was devised to solve these conventional problems, and an object of the present invention is to provide a communication method that enables faster communication than the conventional method.

[Summary of the invention]

The communication method according to the present invention transmits constant pulses of different lengths in response to a combination of a certain number of digital signals, and the receiving side decomposes this pulse into a corresponding combination of digital signals. It is something.

[Embodiments of the invention]

Next, an embodiment of the communication method according to the present invention will be described based on the drawings.

In FIG. 1, computers C1 and C2 are connected via an acoustic coupler M1, a telephone line [1], and an acoustic coupler M2, and the telephone line 1 has an upper limit on its transmission speed.

The computers C1 and C2 operate by transmitting and receiving high and low digital signals, and the acoustic couplers M1 and M2 convert a 2-bit digital signal into one pulse and generate a sound, or conversely, convert a 2-bit digital signal into one pulse and generate a sound. Decomposes into bit digital signals.

Capturing the two bits of a digital signal is a matter of high and low [Figure 2 (
a)], high-high C Fig. 2 (b)), low-low [Second A (d)]
The acoustic couplers Ml' and M2 generate four different length pulses of constant helium corresponding to the four combinations of low and high height (FIG. 2(d)). For example, this correspondence relationship is (a) → (b) +, (
c)→(d).

The relationships are (e) → (f) and (g) → (h).

In this way, by generating a single pulse corresponding to 2 bits, it is possible to transmit information of about twice the number of hits at the upper limit transmission speed of the telephone line 1.

Note that the number of bits associated with one pulse is not limited to two, but may be three or more, for example four.

〔Effect of the invention〕

As mentioned above, the communication method according to the present invention transmits pulses of different lengths and constant levels in response to a combination of a certain number of digital signals, and the receiving side converts these pulses into corresponding combinations of digital signals. Since it is decomposed, it has the excellent effect of making the transmission speed higher than before.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing the communication method according to the present invention;
Figures (a) to (h) are waveform diagrams showing the correspondence with digital signals. CI, C2...Computer, 1...Telephone line. 'M1. M2...Acoustic coupler.

Claims (1)

[Claims] (1) A communication method in which pulses of different lengths and constant levels are transmitted in response to a combination of a certain number of digital signals, and the receiving side decomposes these pulses into corresponding combinations of digital signals.