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Device and method for determining gain and offset and corresponding relation thereof in ADC (analog-to-digital converter)

A technology of correspondence and offset, applied in the electronic field, can solve problems such as poor effect and achieve the effect of quality assurance

Active Publication Date: 2017-05-31
上海顺久电子科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem in the related art that the effect of adjusting the amplitude of the input video signal is poor according to the corresponding relationship between the gain and the offset in the ADC, the present invention provides a method for determining the gain and offset in the ADC and its Correspondence method and device

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  • Device and method for determining gain and offset and corresponding relation thereof in ADC (analog-to-digital converter)

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] figure 1 It is a flowchart of a method for determining the corresponding relationship between gain and offset in ADC provided by an embodiment of the present invention, refer to figure 1 , the method can include:

[0036] Step 101, adjust the offset of the ADC for different amplitudes of the input white signal, and record the offset when the output video signal meets the preset condition; keep the recorded offset unchanged, adjust the gain of the ADC, and record The gain when the blanking period amplitude of the output video signal is equal to the preset amplitude.

[0037] In the embodiment of the present invention, the preset condition may be: the ratio of the difference between the maximum amplitude and the amplitude of the...

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Abstract

The invention belongs to the technical field of electronics and discloses a device and a method for determining a gain and an offset and a corresponding relation thereof in an ADC (analog-to-digital converter). The method includes: adjusting the offset of the ADC according to different amplitudes of input white signals, and recording the offset when an output video signal meets preset conditions; keeping the recorded offset unchanged, adjusting the gain of the ADC, and recording the gain when a blanking interval amplitude of the output video signal is equal to a preset amplitude, wherein the preset conditions include that a ratio of a difference value between a maximum amplitude and the blanking interval amplitude to the blanking interval amplitude is equal to a preset value, and an average amplitude is equal to a median of an ADC measuring range; determining the corresponding relation between the recorded offset and the gain by means of function fitting. Accurate matching of the gain and the offset in the ADC can be guaranteed by the corresponding relation, so that input video signals can be effectively compensated in amplitude adjustment of the input video signals according to the corresponding relation, and quality of the output video signals is guaranteed.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a method and a device for determining gain and offset in an ADC and their corresponding relationship. Background technique [0002] An analog-to-digital converter (English: Analog to Digital Converter; ADC for short) is an electronic component used to convert an analog signal into a digital signal, and is often used in the field of image processing. [0003] In the related art, an ADC can generally convert an analog signal into a digital signal through four steps of sampling, holding, quantization and encoding. In order to reduce the quantization noise of the ADC input video signal, the ADC also needs to amplify the relative amplitude of the input video signal and adjust the absolute amplitude of the input video signal in the process of processing the input video signal. Wherein, the multiple by which the relative amplitude of the input video signal is amplified by the ADC i...

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Application Information

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IPC IPC(8): H04N5/14H04N5/21
CPCH04N5/148H04N5/21
Inventor 吴彪
Owner 上海顺久电子科技有限公司