Automatic gain control method and device for CVBS (Composite Video Broadcast Signal)
An automatic gain control and automatic gain technology, which is applied in color signal processing circuits, brightness and chrominance signal processing circuits, etc., can solve problems such as signal attenuation, line and field synchronization signals cannot be locked, black level overflow, etc., and achieve fast Steady state, accurate effect of automatic gain value
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0031] Such as figure 1 As shown, the CVBS signal automatic gain control method of the present embodiment includes the following steps,
[0032] S100: receiving the CVBS signal, and obtaining a signed translation signal with the rear shoulder as 0 reference after translation;
[0033] S200: multiply the translation signal by the automatic gain value to obtain the amplified signal;
[0034] S300: Obtain the characteristic level of the amplified signal, the characteristic level including the synchronous bottom level, the back porch level and the peak level;
[0035] S400: Obtain the synchronous gain value according to the difference between the synchronous bottom level and the back porch level, and obtain the peak gain value according to the difference between the peak level and the back porch level;
[0036] S500: Select the smaller of the s...
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