JPS58164308A - Binary coding circuit - Google Patents

Abstract

PURPOSE:To extract a low and a high freuency component signal and to eliminate a high frequency component noise, by separating a signal into the high and low frequency components, binary-coding them through threshold value circuits respectively, and mixing and outputting them. CONSTITUTION:The signal containing the noise is supplied from a terminal 38 to a low-pass filter 39 to separate the low frequency component, which is binary- coded by a comparator 41 and outputted as a signal component while inputted to a comparator 40 to be used to separate the high frequency component from the signal. The high frequency component separated by the comparator 40 is passed through comparators 42 and 43 to remove a small-amplitude noise component. Those signal are mixed by an OR circuit 47 and an AND circuit 48 to be outputted.

Description

[Detailed description of the invention] The present invention relates to a binarization (b) path.

Normally, when converting an analog signal into a binary value, a comparator is often used to compare the DC level of the analog signal with a reference DC level called a threshold level. However, in such conventional binarization circuits, high frequency component noise due to induction or interference from other peripheral circuits is often superimposed on the analog signal, and when the analog signal crosses the threshold level or one level, noise is often superimposed on the analog signal. The disadvantage of this method is that an erroneous binary signal is generated due to noise.

In order to remove the noise effects of high frequency components contained in an analog signal, it is conventional to pass the analog signal through a low-pass filter to remove the high frequency components, and then compare it with a DC threshold filter and binarize it. It is often practiced since [
There is. However, in such a binarization circuit,
Since the high frequency components of the analog signal that should originally be binarized are also removed, the output 2
There is a drawback that a component corresponding to the high frequency component signal is missing in the valued signal.

FIG. 1 is a waveform diagram for explaining a conventional binarization procedure.

When the high frequency component noises 4 to 19 and the necessary high frequency component signals 2 and 3 are binarized using a DC threshold filter 20, a binarized signal 21 is obtained. Binarized signal 21 corresponds to necessary signals 2 and 3.
2 and 23 are included, and erroneous binarized signals 24 to 26 corresponding to noises 10 to 12 near the threshold level 20 are generated.

When the analog signal 1 is passed through the low frequency filter, a low frequency signal 27 is obtained, which is sent to the threshold, -/red level 28.
When the signal is binarized, a binarized signal 29 is obtained. Noise 1 is eliminated by passing analog signal 1 through a filter.
Since 0 to 12 are removed, the binary signal 29 contains an incorrect 2.
Although the digitized signals 24 to 26 are not generated, the required signal 2 and 30 levels are reduced, so the necessary binary signal 22 is generated.
and 23 are missing.

As explained above, in the conventional binarization circuit (
If an analog signal containing high frequency component noise and a necessary signal is directly binarized, a negative binarized signal is generated. Furthermore, when a low-frequency signal is extracted from an analog signal and binarized, there is a drawback that the binarized signal corresponding to the necessary high-frequency component signal is missing.

An object of the present invention is to provide a binarization circuit capable of obtaining a binarized signal containing no components corresponding to noise and components corresponding to the necessary signals from an analog signal containing high frequency component noise and necessary signals. Our goal is to provide the following.

According to the present invention, there are provided a means for extracting a low frequency component of an analog signal to be binarized, a means for binarizing the low frequency component, a means for binarizing the low frequency component, and a means for extracting a low frequency component of an analog signal to be binarized. By mixing a plurality of binarized signals obtained by the binarizing means, a binarized signal that is not affected by noise of high frequency components and corresponds to signals of all necessary frequency components is output. A binarization circuit is obtained.Next, the present invention will be explained using the drawings.

There is no perfect method for distinguishing between noise and necessary signals among the high frequency components contained in analog signals.However, a method that can be considered to be quite effective is to distinguish based on the magnitude of the level. In the binarization circuit according to the present invention, a high frequency component is extracted from an analog signal, and one of the high frequency components with a high level is binarized as a necessary signal,
Eliminate everything else as noise.

FIG. 2 is a waveform diagram for explaining the binarization procedure according to the present invention.

When high frequency components are extracted from the analog signal 1 in FIG. 1, a waveform 30 in FIG. 2 is obtained. High frequency component waveform 3
0, signals 31 and 32 correspond to the required signals 2 and 3 of FIG. 1, respectively.

Since the signals 31 and 32 have a higher level than other noises, when they are binarized using DC thresholds 33 and 34, respectively, binarized signals 35 and 36 are obtained. The binarized signals 35 and 36 corresponding to the high frequency component signals are converted into two of the low frequency signals corresponding to the low frequency component signals.
When mixed with the digitized signal 29, a binarized signal 37 corresponding to signals of all frequency components is obtained.

FIG. 3 is a circuit diagram of an embodiment of the present invention.

The text and its operation will be explained below with reference to FIGS. 1 and 2.

When the analog signal 1 shown in FIG. 1 is inputted from the terminal 38 and passed through the low-pass filter 39, the low-pass signal 2 shown in FIG.
7 is obtained. In the comparator 41, the low frequency signal 27 is connected to the threshold level /L/2 supplied from the DC power supply 44.
When the signal is binarized by 8, a binarized signal 29 is obtained. on the other hand,
In the operational amplifier 40, the analog signal 1 and the low frequency signal 2
By taking the difference of 7, a waveform 30 of the high frequency component of the analog signal l is obtained. The waveform 30 of the high frequency component is transferred to the comparator 42.
When the signal is binarized by the threshold voltage drepel 33 supplied from the DC power source 45 in the comparator 43, a binary signal 35 is obtained. A valued signal 36 is obtained. When binary signals 29.35 and 36 are mixed by OR gate 47 and AND gate 48, terminal 4
9, a binarized signal 37 is obtained.

As described above, in the binarization circuit according to the present invention, the analog signal is high 2 without the influence of frequency component noise
An ifL signal is obtained, and by means of extracting high frequency components of the analog signal and means of binarizing the high frequency components, a 2-digit signal containing components corresponding to the necessary additional frequency components is obtained.
By means of obtaining a digitized signal and outputting a binary signal by mixing the compound binary signals, it is possible to avoid the influence of noise of high frequency components and to correspond to signals of all necessary frequency components. It has the advantage that a binary signal can be obtained.

[Brief explanation of drawings]

Fig. 1 is a waveform diagram for explaining the conventional binarization procedure, Fig. 2 is a waveform diagram for explaining the binarization procedure according to the present invention, and Fig. M3 is a circuit diagram of an embodiment of the present invention. be. 1...Analog signal, 2.3...High frequency component, 4-19...Noise, 20...
・Threshold, - level, 21...Binarized signal, 22.23...Binarized signal component, 24,
25.26...Incorrect binarized signal, 27...
...Low frequency signal of analog signal, 28...Threshold, -led level, 29...Binarization fjt number, 30...High frequency component of analog signal, 31
゜32...High frequency component, 33.34...
・Threshold level, 35, 36.37...
...Binarized signal, 38...Terminal, 39...
...Low pass filter, 40.41, 42.43...
...Comparator, 44,45゜46...DC power supply, 47...1 end/gate, 48...
AND gate, 49...terminal. Figure 2, Figure 3 (!)

Claims (1)

[Claims] means for extracting low frequency components from an analog signal to be binarized; means for binarizing the low frequency components;
5ft g is obtained from a means for extracting a high frequency component from an analog signal, a means for binarizing the high frequency component, a means for binarizing the low frequency component, and a means for binarizing the high frequency component. A binarization circuit characterized by having means for obtaining a binarized signal by mixing and outputting a plurality of binarized signals.