CN203479884U - Extreme value sampling circuit - Google Patents
Extreme value sampling circuit Download PDFInfo
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- CN203479884U CN203479884U CN201320558351.5U CN201320558351U CN203479884U CN 203479884 U CN203479884 U CN 203479884U CN 201320558351 U CN201320558351 U CN 201320558351U CN 203479884 U CN203479884 U CN 203479884U
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Abstract
The utility model relates to an analog signal processing technology and especially relates to an extreme value sampling circuit. The circuit comprises a gating circuit, a sampling hold circuit and an emitter follower circuit. A video input signal and a gating signal are input from the input terminal of the gating circuit. Under the condition of gating signal enablement, the video input signal under a gating condition is output.The video input signal under the gating condition is input from the input terminal of the sampling hold circuit and a signal amplitude whose amplitude is highest in a window is obtained, wherein the signal amplitude is an extreme value signal. The extreme value signal is input from the input terminal of the emitter follower circuit and the extreme value signal is output. By using the circuit of the utility model, a signal extreme value in a given scope can be effectively extracted; a gating scope can be flexibly selected; the structure is simple and usage is convenient.
Description
Technical field
The utility model relates to a kind of technology of analog signal processing, specifically a kind of extreme value sample circuit.
Background technology
In the engineering design and algorithm research processed based on image, often can adopt the method for binaryzation to carry out target identification, the target extreme value obtaining in video flowing is one of key link, correct acquisition target extreme value is processed image and target identification, significant.
Utility model content
In order to obtain target extreme value, the utility model provides a kind of method and device of extreme value sampling, adopts the utility model, can in video input signals, obtain a highest echo signal of central signal amplitude, and preserve signal amplitude.
The technical scheme that the utility model adopted is for achieving the above object: a kind of extreme value sample circuit, comprises gating circuit, sampling hold circuit and penetrate with circuit;
Input end input video input signal and the gating signal of described gating circuit are exported the video input signals under gating condition in the situation that gating signal enables;
The input end of described sampling hold circuit is inputted the video input signals under described gating condition, obtains the highest signal amplitude of amplitude, i.e. extreme value signal in window;
The described input end input extreme value signal of penetrating with circuit, for exporting described extreme value signal.
Described gating circuit is specially: 2 pin of the first analog switch connect input signal, and output signal 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, the second electric capacity other end ground connection, and output signal is connected to one end of the first resistance through 5 pin.
Described penetrating with circuit consists of operational amplifier, and its 3 pin connects the other end of the first resistance, between end of oppisite phase and output terminal, is connected in series the second resistance.
The utlity model has following advantage and beneficial effect:
1. adopt the utility model can effectively extract the signal extreme value in given range;
2. adopt the utility model can select flexibly gating scope;
3. the utility model is simple in structure, easy to use.
Accompanying drawing explanation
Fig. 1 is the utility model theory diagram.
Fig. 2 is embodiment circuit theory diagrams of the utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, the utility model equipment therefor comprises: gating circuit is only in the situation that gating signal enables, and vision signal can be by sending to the input end of sample circuit; Sampling hold circuit, receives the output signal of gating circuit, and the maintenance of sampling; 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 connects one end of capacitor C 401 through 1 pin, capacitor C 401 other end ground connection, the 6 pin selecting messengers of U401.Capacitor C 401 two ends, the extreme value signal voltage during remaining with gating signal and enabling, is connected to 3 pin of sampling holder U402, the maintenance of sampling, 6 pin of U402 connect one end of capacitor C 402, capacitor C 402 other end ground connection.After sampling finishes, by U403, capacitor C 401 is carried out to discharge process, so that the next gating cycle samples to input signal.The output signal of sampling holder U402 is connected to one end of resistance R 401 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 of U404 and output terminal, the output of u404 be extreme value signal, for circuit below.
Claims (4)
1. an extreme value sample circuit, is characterized in that, comprises gating circuit, sampling hold circuit and penetrates with circuit;
Input end input video input signal and the gating signal of described gating circuit are exported the video input signals under gating condition in the situation that gating signal enables;
The input end of described sampling hold circuit is inputted the video input signals under described gating condition, obtains the highest signal amplitude of amplitude, i.e. extreme value signal in window;
The described input end input extreme value signal of penetrating 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, the 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); Described the first analog switch (U401) and the second analog switch (U403) adopt ADG419.
3. 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), the second electric capacity (C402) other end ground connection, output signal is connected to one end of the first resistance (R401) through 5 pin; Described the second analog switch (U403) adopts ADG419.
4. a kind of extreme value sample circuit according to claim 1, is characterized in that, described in penetrate with circuit and formed by operational amplifier, its positive input connects the other end of the first resistance (R401), between end of oppisite phase and output terminal, is connected in series the second resistance (R402).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320558351.5U CN203479884U (en) | 2013-09-06 | 2013-09-06 | Extreme value sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320558351.5U CN203479884U (en) | 2013-09-06 | 2013-09-06 | Extreme value sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203479884U true CN203479884U (en) | 2014-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320558351.5U Expired - Fee Related CN203479884U (en) | 2013-09-06 | 2013-09-06 | Extreme value sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203479884U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104422812A (en) * | 2013-09-06 | 2015-03-18 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
-
2013
- 2013-09-06 CN CN201320558351.5U patent/CN203479884U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104422812A (en) * | 2013-09-06 | 2015-03-18 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20170906 |
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| CF01 | Termination of patent right due to non-payment of annual fee |