JPH06252756A - A/d sampling device - Google Patents

Abstract

PURPOSE:To reduce the effect of spike noises by replacing an analog signal subject to sampling and holding with an analog signal at one preceding sampling point when the analog signal is discriminated to be a spike noise. CONSTITUTION:An analog input signal 1 resulting from a reception video signal pulse is sampled and held, and the analog input signal is delayed by one sampling and then subject to sampling and holding, and the delayed analog signal 5' subject to sampling and holding is subtracted from the analog signal 5 subject to sampling and holding. When the difference is smaller than a spike noise setting value 9, a spike noise discrimination device 10 discriminates it not to be a spike noise and when the difference is larger than or equal to the spike noise setting value 9, the spike noise discrimination device 10 discriminates it to be a spike noise. When discriminated to be a spike noise, a selector 13 selects the delayed analog signal 5' subject to sampling and holding and the selected signal 5' is fed to an A/D converter 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling device for A / D converting a single pulse of a radar reception signal and processing the signal.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing the configuration of a conventional A / D sampling apparatus. 1 is an analog input signal, 4 is a sample and hold device, 5 is a sampled and held analog signal, and 14 is an A / D converter. , 15 is a digital signal, and 16 is a signal processor.

The conventional device is constructed as described above, and the analog input signal 1 is converted into the analog signal 5 sampled and held by the sample and hold device 4, and A /
The analog signal 5 sampled and held by the D converter 14 is converted into a digital signal 15, and the digital signal 15 is transmitted to a signal processor 16.

Next, the operation will be described with reference to the drawings. In the analog input signal 1 which is a single pulse of the radar received video signal as shown in FIG.
At B, C and D, the analog input signal 1 is sampled and held as in 5, and the sampled and held analog signal 5 is converted into a voltage of the analog and signal 5 sampled and held by the A / D converter 14. It is converted into a corresponding digital signal 15.

[0005]

In the analog input signal 1 which is a single pulse of the radar received video signal having spike noise as shown in FIG. 5, sampling points A, B, C and D are shown in FIG. 5, for example. In the case, the spike noise is not affected, but in the case of sampling points A, B, C and D as shown in FIG. 6, the spike noise is affected and the sample is held as shown in FIG. 6 depending on the sampling timing. Another problem is that the analog signal 5 is affected by spike noise.

The present invention has been made to solve the above problems, and it is an object of the present invention to determine whether a sample-and-hold analog signal is spike noise and reduce the effect of spike noise.

[0007]

An A / D sampling apparatus according to the present invention includes a delay device for delaying an analog signal,
A subtracter that takes the difference between the sampled and held analog signals, a spike noise set value input device that sets the value that determines the analog signal as spike noise, a spike noise determiner that determines whether it is spike noise, and two samples It is provided with a selector for selecting and outputting the held analog signal.

Also, an averaging device for averaging two sample-and-hold analog signals is provided.

[0009]

According to the present invention, the difference between the value of the analog signal at a certain sampling point on the time axis and the value of the analog signal at the immediately preceding sampling point is calculated, and if the difference is larger than the set value, a spike is generated. The influence of spike noise is reduced by determining noise and replacing the value of the analog signal at the sampling point with the value of the analog signal at the previous sampling point.

When it is determined that the noise is spike noise, the value of the analog signal at the sampling point is
The effect of spike noise is reduced by replacing the analog signal value at the previous sampling point with the average value of the analog signal value at the subsequent sampling point.

[0011]

EXAMPLES Example 1. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, in which 1, 4, 5, 14, 15,
16 is the same as the conventional device, 2 is a delay device, 3 is a delayed analog signal, 6 is a subtractor, 7 is the difference between sampled and held analog signals, and 8 is a spike noise set value input device. , 9 are spike noise setting values, 10
Is a spike noise determiner, and 13 is a selector.

The A / D sampling apparatus configured as described above samples and holds the analog input signal 1 which is a single pulse of the received video signal, delays the analog input signal 1 by one sampling, and holds the sampled signal. From the value of the sampled and held analog signal 5, the delayed sampled and held analog signal 5 '
If the value is smaller than the spike noise setting value 9, the spike noise determining unit 10 does not determine spike noise, and if the value is greater than or equal to the spike noise setting value 9, spike noise is determined. If it is not judged as spike noise, the analog signal 5 sampled and held by the selector 13
Is selected and when it is determined to be spike noise, the analog signal 5 ′ delayed and sampled and held by the selector 13 is selected and transmitted to the A / D converter 14.

Regarding the A / D sampling device shown in FIG.
~ It demonstrates using FIG. 1, 3, 5, 5 ',
7, 9 are the same as above.

The analog input signal 1 as shown in FIG. 7 is converted into the analog signal 5 sampled and held by the sample and hold unit 4, and the analog input signal 1 is delayed by one sampling by the delay unit 2 as shown in FIG. 8 is subtracted from the value shown in FIG. 7 by the subtractor 6 and the difference between the sampled and held analog signals is obtained. 7 becomes like FIG. Here, when the spike noise setting value is as shown in FIG. 9, the difference 7 between the sampled and held analog signals at the sampling points B, D, and E is smaller than the spike noise set value 9, so the analog sampled and held by the selector 13 is used. The signal 5 is selected, and the difference 7 between the analog signals sampled and held at the sampling point C is larger than the spike noise setting value 9. Therefore, the analog signal 5 ′ sampled and held after being delayed by one sampling is selected by the selector 13. A signal A / D converter 14 as shown in FIG.
Be transmitted to.

Example 2. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 to 10 and 13 to 16 are the same as those of the device of the first embodiment, 11 is an averager, and 12 is an average value. is there.

The A / D sampling apparatus configured as described above is the same as the analog input signal 1 in the first embodiment.
Is provided with a delayer 2 ′ for delaying two samplings, and an averaging device 11 for averaging the sampled and held analog signal 5 ″ delayed and sampled twice. If the spike noise determiner 10 does not determine spike noise, the selector 13 selects the analog signal 5 ′ delayed by one sampling and sample-held,
If it is determined to be spike noise, the selector 13 selects the analog signal 5 ″ sampled and held after being delayed by the sampling twice and the average value 12 of the analog signal 5 sampled and held, and the A / D converter is selected. 14 is transmitted.

FIG. 7 shows the A / D sampling device.
~ It demonstrates using FIG. 9, FIG. 11, and FIG. 1,
3, 3 ', 5, 5', 5 '', 7, 9, 12 are the same as above.

The analog input signal 1 shown in FIG. 7 is shown in FIG.
As described above, it is converted into an analog signal 3 ′ delayed by sampling twice by the delay device 2 ′ and converted into an analog signal 5 ″ sampled and held by the sample hold device 4. Here, since the sampling points B, D, and E are not determined to be spike noise from FIG. 9, the values of B, C, and E in FIG. 8 are selected, and the sampling point C is determined to be spike noise. And Figure 1
The average value of D of 1 is selected, and the signal A as shown in FIG.
It is transmitted to the / D converter 14.

[0019]

Since the present invention is constructed as described above, it has the following effects.

A delay device for delaying one sampling, a subtractor for taking a difference between sampled and held analog signals, a spike noise set value input device for setting a value for judging spike noise, and a judgment for spike noise. By having a spike noise determiner and a selector that selects and outputs the analog signal sampled and held by the output signal of the spike noise determiner, when it is determined to be spike noise, the analog signal at the sampling point The effect of spike noise can be reduced by replacing the value with the value of the analog signal at the previous sampling point.

Further, by providing a delay device that delays by two samplings and an averaging device that averages the sampled and held analog signals, the value of the analog signal at the sampling point when spike noise is determined. Can be reduced to the average value of the analog signal value at the previous sampling point and the analog signal value at the subsequent sampling point to reduce the effect of spike noise.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an A / D sampling device showing a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of an A / D sampling device showing a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a conventional A / D sampling device.

FIG. 4 is a diagram showing a relationship between an analog input signal and a sample-and-hold analog signal in a conventional device.

FIG. 5 is a diagram showing a relationship between an analog input signal having spike noise and a sample-and-hold analog signal unaffected by spike noise in a conventional device.

FIG. 6 is a diagram showing a relationship between an analog input signal having spike noise and a sample-and-hold analog signal affected by spike noise in a conventional device.

FIG. 7 is a diagram showing a relationship between an analog input signal having spike noise and a sample-and-hold analog signal affected by spike noise according to the first embodiment of the present invention.

FIG. 8 is a diagram showing a relationship between an analog signal delayed by one sampling point and a sample-and-hold analog signal according to the first embodiment of the present invention.

FIG. 9 is a diagram showing a relationship between a difference between sampled and held analog signals and a spike noise setting value according to the first embodiment of the present invention.

FIG. 10 is a diagram showing signals selected by a selector and transmitted to an A / D converter in Embodiment 1 of the present invention.

FIG. 11 is a diagram showing a relationship between an analog signal delayed by two sampling points and a sample-and-hold analog signal according to the second embodiment of the present invention.

FIG. 12 is a diagram showing signals selected by a selector and transmitted to an A / D converter in Embodiment 2 of the present invention.

[Explanation of symbols]

 1 analog input signal 2 delay device 3 delayed analog signal 4 sample and hold device 5 sample and hold analog signal 6 subtractor 7 sample and hold analog signal difference 8 spike noise set value input device 9 spike noise set value 10 spike Noise determiner 11 Averager 12 Average value 13 Selector 14 A / D converter 15 Digital signal 16 Signal processor

Claims (2)

[Claims] 1. A delayer for delaying the analog input signal by one sampling in A / D conversion of the analog input signal which is a single pulse of a radar reception video signal to be signal-processed, and a sample for sample-holding the analog signal. The difference between the hold device, the subtractor that takes the difference between the sampled and held analog signals, the spike noise set value input device that sets the value for determining the analog input signal as spike noise, and the difference between the sampled and held analog signals And a spike noise set value are compared to determine whether the noise is spike noise, an analog signal sampled and held by the output signal of the spike noise judger, and an analog sampled and held after being delayed by one sampling. Selector for selecting and outputting signals The selected analog signal is A /
An A / D sampling device comprising an A / D converter for D conversion and a signal processor for processing the digital signal. 2. A delay device for delaying an analog input signal by sampling twice, and an averaging device for averaging the sample-held analog signal and the sample-holding analog signal delayed by sampling twice. The A / D sampling device according to claim 1, which is characterized in that.