Video automatic gain control amplifier for road monitoring
A technology of automatic gain control and amplifier, which is applied in the direction of TV, color TV, color TV parts, etc., can solve the problems of complex circuit structure, unstable operation, unclear image, etc., and achieve simple circuit structure, which is conducive to popularization, The effect of improving sharpness
Inactive Publication Date: 2015-05-13
CHENGDU KAIZHI TECH
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Problems solved by technology
In many road monitoring video transmission systems, due to different receiving environments or external interference, the strength of the received signal may vary greatly, resulting in unclear images or serious distortion of image signals. For this reason, we use video automatic gain control amplifiers Used in road monitoring to reduce the occurrence of this problem
However, many video automatic gain control amplifiers work unstable, the required control power is large, and the operating point of the controlled amplifier stage varies greatly, and the impedance at both ends of the amplifier changes greatly, and the circuit structure is complicated, there are many components, and the cost is high.
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[0009] The present invention will be further described below in conjunction with accompanying drawing:
[0010] like figure 1 As shown: the present invention includes a DC power supply V, a signal input port UE, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, The eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, Eighth resistor R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, first diode VD1, second diode Tube VD2, balanced modulator IC, video amplifier U and signal output port UA, the signal input port UE is connected to the first end of the first capacitor C1, and the second end of the first capac...
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The invention discloses a video automatic gain control amplifier for road monitoring. The video automatic gain control amplifier comprises a direct current power supply, a signal input port, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteen resistor, a fourteen resistor, a first diode, a second diode, a balanced modulator, a video amplifier and a signal output port. The video amplifier and the balanced modulator are connected so as to jointly form an automatic gain control system with good performances, and the automatic gain control system effectively improves the definition of an image signal in road monitoring. Furthermore, the video automatic gain control amplifier has the advantages of small power, high sensitivity, simple circuit structure, few elements, and low cost.
Description
technical field [0001] The invention relates to a road monitoring auxiliary device, in particular to a video automatic gain control amplifier for road monitoring. Background technique [0002] The urban road monitoring system plays an important role in the prevention and control of public security. Further optimizing the monitoring system and expanding its various functions can not only reduce its construction and maintenance costs, but also provide technology for the detection of various cases such as traffic and public security. Support, high-quality and stable surveillance video images have greatly improved the level and efficiency of law enforcement and case handling by public security organs. In many road monitoring video transmission systems, due to different receiving environments or external interference, the strength of the received signal may vary greatly, resulting in unclear images or serious distortion of image signals. For this reason, we use video automatic ga...
Claims
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Inventor 郭辉罗彬覃树建
Owner CHENGDU KAIZHI TECH