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An adaptive signal processing method, device and decoder

A technology of adaptive signal and processing method, applied in the field of communication, can solve the problem of unable to recognize another analog video signal decoding, unable to recognize high-definition analog video signal decoding, analog video decoder can not support high-definition analog video signal and standard definition analog video signal at the same time Video signal identification and decoding and other issues to achieve the effect of compatibility

Active Publication Date: 2014-10-15
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing analog video decoders decode standard-definition analog video signals or high-definition analog video signals according to a fixed decoding method, that is, an analog video decoder can only recognize and decode one analog video signal, but cannot recognize another analog video signal And decode it, for example, an analog video decoder capable of decoding standard-definition analog video signals can only identify and decode received standard-definition analog video signals, but cannot recognize and decode received high-definition analog video signals
[0004] Therefore, an analog video decoder cannot simultaneously support the identification and decoding of high-definition analog video signals and standard-definition analog video signals
Support for video source compatibility is not guaranteed as the video source may provide SD analog video signals as well as HD analog video signals

Method used

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  • An adaptive signal processing method, device and decoder
  • An adaptive signal processing method, device and decoder
  • An adaptive signal processing method, device and decoder

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1 of the present invention provides an adaptive signal processing method, and the steps of the method can be as follows figure 1 shown, including:

[0023] Step 101. Determine the type of the analog video signal.

[0024] According to the different characteristics of the chrominance subcarrier frequency of different types of analog video signals, in this step, the frequency of the chroma subcarrier in the received analog video signal can be determined, and the received analog signal can be determined according to the frequency of the chrominance subcarrier. The type of video signal.

[0025] For example, the chroma subcarrier frequency of a standard definition analog video signal is different from the chroma subcarrier frequency of a high definition analog video signal. In this embodiment, the type of the analog video signal is identified by identifying the frequency of the chrominance subcarrier according to the characteristic that the frequencies of the c...

Embodiment 2

[0044] Combine below image 3 , the flow of the adaptive signal processing method provided in steps 101 to 103 in the first embodiment will be described in detail.

[0045] The process includes: receiving an analog video signal, detecting the frequency of the chrominance subcarrier in the received analog video signal, and determining the type of the analog video signal by detecting the frequency of the chrominance subcarrier:

[0046] When it is determined that the analog video signal is the CVBS of the 720H ​​format or the CVBS of the 960H format, the analog video signal can be filtered by a low-pass filter with a cut-off frequency of 8MHz, and a clock with a sampling frequency of 27MHz can be used as a synchronous sampling clock, The filtered analog video signal is decoded according to the SD analog video signal decoding method, and then the decoded signal is converted into a digital signal output using the YCbCr encoding method.

[0047] When it is determined that the anal...

Embodiment 3

[0050] Embodiment 3 of the present invention provides an adaptive signal processing device, which can be integrated in an analog video decoder, and can be understood as an analog video decoding chip, and the structure of the device can be as follows Figure 4 shown, including:

[0051] The recognition unit 11 is used to determine the frequency of the chroma subcarrier in the received analog video signal, and determines the type of the received analog video signal according to the frequency of the chroma subcarrier; the decoding unit 12 is used to determine from the pre-saved decoding method The decoding mode corresponding to this type uses the determined decoding mode to decode the analog video signal.

[0052] The identification unit 11 is specifically configured to determine that the received analog video signal is a standard-definition analog video signal when determining that the frequency is the first set frequency, or, when determining that the frequency is the second se...

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PUM

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Abstract

The embodiments of the invention provide an adaptive signal processing method, a device and a decoder. The method comprises the following steps: determining the type of an analog video signal by identifying the frequency of a chrominance subcarrier of the analog video signal by utilizing the characteristic that chrominance subcarriers of different types of analog video signals have different frequencies; and determining a corresponding decoding method from preserved decoding methods according to the determined type of the analog video signal, and decoding the analog video signal by using the corresponding decoding method. Thus, whatever type of analog video signal provided by a video source, the analog video signal can be processed adaptively, so that the support for video source compatibility is realized.

Description

technical field [0001] The present invention relates to the communication field, in particular to an adaptive signal processing method, device and decoder. Background technique [0002] In the security industry, the analog camera sends the analog video signal from the camera end to the back-end encoder for encoding or preview through a coaxial cable. The back-end encoder generally uses a dedicated analog video decoder for composite video to decode the analog video signal. [0003] The current mainstream analog video decoders include: decoders for standard definition analog video signals (including composite video broadcast signals (CVBS, Composite Video Broadcast Signal) in 720H ​​format or extended 960H format), and decoders for high definition analog video signals (including 1280H format analog video signal) decoder. Existing analog video decoders decode standard-definition analog video signals or high-definition analog video signals according to a fixed decoding method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N11/04H04N9/12H04N5/46
Inventor 殷俊张兴明傅利泉朱江明吴军吴坚
Owner ZHEJIANG DAHUA TECH CO LTD