Video input decoding chip

A video input and decoding chip technology, applied in the video field, can solve the problems of video processor encoding and decoding and processing chip design difficulties, and achieve the effects of reducing system area and complexity, improving signal-to-noise ratio, and increasing signal processing speed

Inactive Publication Date: 2009-04-29
CHENGDU CORPRO TECH CO LTD
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Problems solved by technology

[0003] At present, in the field of AD / DA converters of analog circuits, low-precision high-speed or low-speed high-precision structures such as full parallel, integral type, and successive approximation are mainly used, which brings certain challenges to the design of video processor encoding and decoding and processing chips. difficulty

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  • Video input decoding chip
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Embodiment Construction

[0029] The present invention will be further described below with reference to the drawings and embodiments.

[0030] Such as figure 1 As shown, the direct digital frequency synthesis module is controlled by the 6-bit digital code DDS_CLK, and the frequency of the input clock CLK_IN is 24.576MHz. This module provides a stable 27MHz frequency clock for the entire system. The power-on reset module samples the reference voltage, digital and analog power supplies to reset the entire system; while sampling the voltage signal, the module also samples the clock signal output by the phase-locked loop, when the power supply voltage is lower than 2.8V or the clock frequency is lower than 1MHz When the power-on reset module outputs a reset signal. The bandgap reference source module provides a constant 1.2V reference voltage and several bias currents for the system. There are three analog signal processing channels, which can process CVBS, Y / C and RGB signals, and output the quantized 9-bit...

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Abstract

The invention relates to a video input decoder chip which comprises a digital direct frequency synthesizing module, a phase lock loop module, a power on reset module, a digital circuit module, a bandgap reference module, a V-I conversion module, a test end selection module and three signal processing channels, i.e. channel 1, channel 2 and channel 3, wherein, the channels comprise a signal source selection module, a clamp module, an automatic gain control module, an anti-alias filter and an analog-to-digital conversion module. The chip can process CVBS, Y / C and RGB signals, has strong noise suppression capability, generates a reference voltage and a clock interiorly, realizes the high integration degree, needs no external decoupling capacitor, greatly reduces the system area and the complexity degree and improves the signal processing efficiency.

Description

Technical field [0001] The invention relates to the field of video, in particular to a video decoding chip. Background technique [0002] Video decoding chips are widely used in transportation, commerce, finance, military and security fields. Video decoding technology involves core technologies such as encoding / decoding algorithms, comb filters, video noise and processing, and image enhancement algorithm research. At present, domestic research on it is mainly concentrated in major universities. There are few commercial video codec processing chips. The chip supply is mainly from foreign manufacturers, such as Philips in the Netherlands, TI, Trident, Pixelworks, Genesis and other companies in the United States. [0003] At present, in the field of analog circuit AD / DA converters, low-precision, high-speed or low-speed and high-precision structures such as full parallel, integral, and successive approximation are mainly used. This brings a certain degree to the design of video proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N5/14H04N5/21
Inventor (请求不公开姓名)
Owner CHENGDU CORPRO TECH CO LTD
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