CN104422812A - Extreme value sampling circuit - Google Patents
Extreme value sampling circuit Download PDFInfo
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- CN104422812A CN104422812A CN201310405198.7A CN201310405198A CN104422812A CN 104422812 A CN104422812 A CN 104422812A CN 201310405198 A CN201310405198 A CN 201310405198A CN 104422812 A CN104422812 A CN 104422812A
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- signal
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Abstract
The invention relates to an analog signal processing technology, in particular to an extreme value sampling circuit. The extreme value sampling circuit comprises a gating circuit, a sampling keeping circuit and an emission following circuit, wherein the input end of the gating circuit is used for inputting a video input signal and a gating signal; under a gating signal enabling situation, a video input signal under a gating condition is output; the input end of the sampling keeping circuit is used for inputting the video input signal under the gating condition to obtain a highest signal amplitude in a window, namely, an extreme value signal; the input end of the emission following circuit is used for inputting the extreme value signal and outputting the extreme value signal. By adopting the extreme value sampling circuit, a signal extreme value in a given range can be extracted effectively, and the gating range can be selected flexibly. The extreme value sampling circuit is simple in structure, and is convenient to use.
Description
Technical field
The present invention relates to a kind of technology of analog signal processing, specifically a kind of extreme value sample circuit.
Background technology
Based in the engineering design of image procossing and algorithm research, the method for binaryzation often can be adopted to carry out target identification, the target extreme value obtained in video flowing is one of key link, and correct acquisition target extreme value is to image procossing and target identification, significant.
Summary of the invention
In order to obtain target extreme value, the invention provides method and the device of a kind of extreme value sampling, adopting the present invention, the highest echo signal of a central signal amplitude can be obtained in video input signals, and preserve signal amplitude.
The technical scheme that the present invention is adopted for achieving the above object is: a kind of extreme value sample circuit, comprises gating circuit, sampling hold circuit and penetrates with circuit;
The input end input video input signal of described gating circuit and gating signal, export the video input signals under gating condition when gating signal is enable;
The input end of described sampling hold circuit inputs the video input signals under described gating condition, obtains the signal amplitude that in window, amplitude is the highest, i.e. extreme value signal;
The described input end input extreme value signal penetrated with circuit, for exporting described extreme value signal.
Described gating circuit is specially: 2 pin of the first analog switch connect input signal, outputs signal and connects one end of the first electric capacity and 1 pin of the second analog switch through 1 pin, the first electric capacity other end ground connection, 6 pin selecting messengers of the first analog switch; 2 pin ground connection of the second analog switch.
Described analog switch adopts ADG419.
Described sampling hold circuit adopts LF198, and its 3 pin connects 1 pin of the second analog switch, and 6 pin connect one end of the second electric capacity, and the second electric capacity other end ground connection, outputs signal the one end being connected to the first resistance through 5 pin.
Described penetrating is made up of operational amplifier with circuit, and its 3 pin connects the other end of the first resistance, is connected in series the second resistance between end of oppisite phase with output terminal.
The present invention has the following advantages and beneficial effect:
1. employing the present invention effectively can extract the signal extreme value in given range;
2. adopt the present invention can select strobe scope flexibly;
3. structure of the present invention is simple, easy to use.
Accompanying drawing explanation
Fig. 1 is principle of the invention block diagram.
Fig. 2 is one embodiment of the invention circuit theory diagrams.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, equipment therefor of the present invention comprises: gating circuit is only when gating signal is enable, and vision signal can by sending to the input end of sample circuit; Sampling hold circuit, receives the output signal of gating circuit, and sampling keeps; Penetrate with circuit, for output stage value signal.
As shown in Figure 2, be specially: 2 pin of analog switch U401 connect input signal, output signal the one end meeting electric capacity C401 through 1 pin, electric capacity C401 other end ground connection, the 6 pin selecting messengers of U401.Electric capacity C401 two ends, remain with the extreme value signal voltage of gating signal enable period, are connected to 3 pin of sampling holder U402, and carry out sampling and keep, 6 pin of U402 connect one end of electric capacity C402, electric capacity C402 other end ground connection.After sampling terminates, by U403, discharge process is carried out to electric capacity C401, so that the next gating cycle samples to input signal.The output signal of sampling holder U402 is connected to one end of resistance R401 through 5 pin, the other end of R401 is connected to 3 pin of operational amplifier U404, operational amplifier U404 connects into and penetrates with circuit, series resistor R402 between the end of oppisite phase and output terminal of U404, namely the output of u404 be extreme value signal, for circuit below.
Claims (5)
1. an extreme value sample circuit, is characterized in that, comprises gating circuit, sampling hold circuit and penetrates with circuit;
The input end input video input signal of described gating circuit and gating signal, export the video input signals under gating condition when gating signal is enable;
The input end of described sampling hold circuit inputs the video input signals under described gating condition, obtains the signal amplitude that in window, amplitude is the highest, i.e. extreme value signal;
The described input end input extreme value signal penetrated with circuit, for exporting described extreme value signal.
2. a kind of extreme value sample circuit according to claim 1, it is characterized in that, described gating circuit is specially: 2 pin of the first analog switch (U401) connect input signal, output signal connects one end of the first electric capacity (C401) and 1 pin of the second analog switch (U403) through 1 pin, first electric capacity (C401) other end ground connection, 6 pin selecting messengers of the first analog switch (U401); 2 pin ground connection of the second analog switch (U403).
3. a kind of extreme value sample circuit according to claim 2, is characterized in that, described analog switch adopts ADG419.
4. a kind of extreme value sample circuit according to claim 1, it is characterized in that, described sampling hold circuit adopts LF198, its 3 pin connects 1 pin of the second analog switch (U403), 6 pin connect one end of the second electric capacity (C402), second electric capacity (C402) other end ground connection, outputs signal the one end being connected to the first resistance (R401) through 5 pin.
5. a kind of extreme value sample circuit according to claim 1, is characterized in that, described in penetrate and be made up of operational amplifier with circuit, its 3 pin connects the other end of the first resistance (R401), is connected in series the second resistance (R402) between end of oppisite phase with output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310405198.7A CN104422812A (en) | 2013-09-06 | 2013-09-06 | Extreme value sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310405198.7A CN104422812A (en) | 2013-09-06 | 2013-09-06 | Extreme value sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104422812A true CN104422812A (en) | 2015-03-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310405198.7A Pending CN104422812A (en) | 2013-09-06 | 2013-09-06 | Extreme value sampling circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN104422812A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160915Y (en) * | 1993-01-12 | 1994-04-06 | 董华 | Digital watt-hour meter for multiple consumers |
| US6121799A (en) * | 1999-04-29 | 2000-09-19 | Tektronix, Inc. | Interleaved digital peak detector |
| CN101231344A (en) * | 2008-02-20 | 2008-07-30 | 福建师范大学 | Signal peak value sampling holding device and application thereof in nuclear energy spectrometry system |
| CN101615423A (en) * | 2008-06-24 | 2009-12-30 | 三星电子株式会社 | Information-storing device and the method for operating this device |
| CN202075334U (en) * | 2011-06-09 | 2011-12-14 | 河北工业大学 | Peak voltage digital display meter |
| CN203479884U (en) * | 2013-09-06 | 2014-03-12 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
-
2013
- 2013-09-06 CN CN201310405198.7A patent/CN104422812A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160915Y (en) * | 1993-01-12 | 1994-04-06 | 董华 | Digital watt-hour meter for multiple consumers |
| US6121799A (en) * | 1999-04-29 | 2000-09-19 | Tektronix, Inc. | Interleaved digital peak detector |
| CN101231344A (en) * | 2008-02-20 | 2008-07-30 | 福建师范大学 | Signal peak value sampling holding device and application thereof in nuclear energy spectrometry system |
| CN101615423A (en) * | 2008-06-24 | 2009-12-30 | 三星电子株式会社 | Information-storing device and the method for operating this device |
| CN202075334U (en) * | 2011-06-09 | 2011-12-14 | 河北工业大学 | Peak voltage digital display meter |
| CN203479884U (en) * | 2013-09-06 | 2014-03-12 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150318 |