JPS5972259A - Signal transmitting method - Google Patents

Abstract

PURPOSE:To remove higher harmonics by representing binary bit information by the combination of the 1st signal and the 2nd signal having same frequency with and is out of phase with the 1st signal. CONSTITUTION:A sine wave oscillation circuit 1 sends out a sine wave signal (a) to an inverter 2, zero-cross detecting circuit 3, and analog multiplexer 5. The inverter 2 outputs the antiphase sine wave signal (b) to the multiplexer 5. The circuit 3, on the other hand, detects the point where the signal (a) shifts in phase by 2npi radian, and a zero-cross pulse signal (c) having some time width is generated synchronously. A base-band latch signal (e) selects the input channel on the side of the signal when at a high level or the input channel on the side of the antiphase inverted sine wave signal (b) when at a low level.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a signal transmission method for transmitting bit information using two signals having mutually different phases.

Conventional configuration and its problems When transmitting data by wire or wirelessly, it is necessary to encode the transmitted data, that is, at what signal level,
One of the major issues in data transmission is how to modulate and transmit the waveform.

That is, better data encoding not only increases the reliability of data transmission, but also simplifies the transmission circuit.

A typical encoding method that has existed in the past is FSX.

Various methods such as FM, PWM, MF, or AM modulation methods have been proposed and are in practical use.

However, each of these methods has its advantages and disadvantages, and the reality is that they are used depending on the purpose. on the other hand,
Data transmission using a data format that does not involve modulation, that is, baseband, is also possible because the transmission circuit can be easily configured.
Widely used. For example, a typical baseband transmission system uses start-stop synchronization as shown in FIG. This represents data "0" when the voltage level is O volts, and data "1" when the voltage level is X volts.
It consists of a data bit stream B and a stop bit C. This baseband method is usually a transmission method consisting of a rectangular wave train, and its drawback is that it contains many harmonics, which makes multiplex transmission impossible.

OBJECTS OF THE INVENTION In view of the above drawbacks, it is an object of the present invention to provide a signal transmission method that can remove harmonics by a simple method despite baseband data transmission.

Structure of the Invention In order to achieve the above object, the present invention expresses binary bit information by combining a first signal and a second signal having the same frequency and opposite phase as the first signal. This is how it was done.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of a signal transmission device used in a signal transmission method according to an embodiment of the present invention.

In the figure, 1' is a sine wave oscillation circuit that outputs a sine wave signal (sine wave signal) a, 2 is an inverter that inverts the sine wave signal a and outputs an inverse phase sine wave signal, and 3 is an inverter that outputs a sine wave signal a. A zero cross detection circuit detects the point where the phase shift of The circuit 5 is an analog multiplexer that switches between the sine wave signal a1 and the reverse phase sine wave signal based on the baseband latch signal e sent from the latch circuit 4, and sends out the switched sine wave output signal f. .

The signal transmission method of this embodiment will be explained below using the apparatus configured as described in Section 2 with reference to the waveform diagram shown in FIG.

First, a sine wave signal a shown in FIG. 3(a) is sent from the sine wave oscillation circuit 1 to the inverter 2, zero cross detection circuit 3, and analog multiplexer 5.

Then, the inverter 2 sends an anti-phase sine wave signal shown in FIG. 3(b) to the analog multiplexer 6.

On the other hand, in the zero loss extraction circuit 3, the phase shift of the sine wave signal a is
A point at which 2nπ radians is detected is detected, and a zero cross pulse signal C having a certain time width is generated in synchronization with this point. This timing is as shown in FIG. 3(c). Then the third
The baseband signal d composed of a rectangular wave shown in the figure is latched by the reset circuit 5 by the pass signal C. Here, if the time corresponding to one bit length of the baseband signal d and the oscillation period of the sine wave signal a are made the same, then
After the base bump signal d is input to the latch circuit 5 and the next zero cross pulse signal C is input at time t, it is latched to the launch circuit. The baseband launch signal e, which is the output of the latch circuit 5, is shown in Fig. 3 (E).
As shown in , it changes slightly depending on the baseband signal d. In this state, the next zero cross pulse signal C is applied to the latch circuit 5.
It is configured to hold until it is entered in
As a result, the output basepant latch signal e of the latch circuit 5 reproduces the baseband signal d with a time delay.

This baseband latch signal e is input to the analog multiplexer 6 and used to control switching of input channels of the analog multiplexer 6.

Specifically, when the baseband latch signal e is at High level, the input channel on the sine wave signal a side is input, and when it is at Low level, the input channel on the inverted sine wave signal side with the opposite phase shift from the sine wave signal a is input. Select a channel. The selected sine wave signals a and b are then obtained as the output signal f of the analog multiplexer 6 shown in FIG. Note that FIG. 4 corresponds to FIG. 1 and shows a sine wave output signal f' (sine wave stream) obtained from the baseband signal d'.

As described above, according to this embodiment, since the information of the baseband signal d is transmitted using the sine wave signals a and b whose phases are shifted from each other, almost no high frequency is contained, which is a drawback of the conventional baseband method. , it is possible to perform multiplex transmission by using multiple frequencies, and it is also possible to eliminate parity pits and achieve a high error detection rate by continuously transmitting "1" and "0" complementary signals.

Effects of the Invention As described above, the present invention converts binary bit information into a first signal and a second signal which has the same frequency as the first signal and has an opposite phase.
By expressing it in combination with the signal, harmonics can be removed in a simple way, and the effect is impressive.

[Brief explanation of the drawing]

Figure 1 is a waveform diagram showing the data format of the start-stop synchronization signal.
The figure is a block diagram of a signal transmission device used in the signal transmission method according to an embodiment of the present invention, FIG. 3 is a waveform diagram of each main part of the same, and FIG. 4 is a sine wave obtained by the signal transmission method of this embodiment. It is a stream waveform diagram. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure BC Figure 3 Figure 4

Claims (1)

[Claims] [Li] An information signal having binary bit information is expressed by a combination of a first signal and a second signal having the same frequency and opposite phase as the first signal. A signal transmission method characterized by: (2) A first sine wave is used for the first signal, a second sine wave having the same frequency and opposite phase as the first sine wave is used for the second signal, and the bits of the information signal are Claim 1, characterized in that when the information indicates "○", a first sine wave is assigned, and when the bit information indicates "1", a second sine wave is assigned. signal transmission method.