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Method, apparatus and computer-readable storage medium for adjusting local carrier frequency

A technology of local carrier and carrier frequency, applied in FM carrier system, parts of color TV, parts of TV system, etc., can solve the problem of low accuracy of composite video signal

Active Publication Date: 2019-12-24
저장진셍일렉트로닉스테크놀러지컴퍼니리미티드
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for adjusting the local carrier frequency to solve the technical problem of low accuracy in demodulating composite video signals in the prior art

Method used

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  • Method, apparatus and computer-readable storage medium for adjusting local carrier frequency
  • Method, apparatus and computer-readable storage medium for adjusting local carrier frequency
  • Method, apparatus and computer-readable storage medium for adjusting local carrier frequency

Examples

Experimental program
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Embodiment 1

[0057] See figure 1 , the embodiment of the present invention provides a method for adjusting the local carrier frequency, the process of the method can be described as follows:

[0058] S101: Receive a composite video signal, and determine a first phase difference value between a local carrier and a chrominance subcarrier of the composite video signal; wherein, the local carrier has a first local carrier frequency;

[0059] S102: When it is determined that the first phase difference is greater than the preset phase difference, adjust the local carrier from the first local carrier frequency to the second local carrier frequency, so that the adjusted local carrier and the chrominance subcarrier of the composite video signal The second phase difference value is smaller than the preset phase difference value.

[0060] In S101, the composite video signal can be represented by Formula 1.

[0061] s(t)=y+u*sin(ω*t+θ i )+v*cos(ω*t+θ i ) (Formula 1)

[0062] Wherein, the chromina...

Embodiment 2

[0108] See Figure 4 , based on the same inventive concept, an embodiment of the present invention provides an apparatus for adjusting a local carrier frequency, and the apparatus may be a device such as a back-end demodulation device. Wherein, the device may include a receiving module 41 and an adjusting module 42 .

[0109] A receiving module 41, configured to receive a composite video signal, and determine a first phase difference between a local carrier and a chrominance subcarrier of the composite video signal; wherein the local carrier has a first local carrier frequency;

[0110] An adjustment module 42, configured to adjust the local carrier frequency from the first local carrier frequency to a second local carrier frequency when it is determined that the first phase difference is greater than the preset phase difference, so that the adjusted local carrier frequency and the The second phase difference between the chrominance subcarriers of the composite video signal i...

Embodiment 3

[0124] Based on the same inventive concept, an embodiment of the present invention provides another device for adjusting the local carrier frequency, which includes:

[0125] at least one processor, and

[0126] a memory, a communication interface communicatively connected to the at least one processor;

[0127] Wherein, the memory stores instructions executable by the at least one processor, and the at least one processor executes the method described in Embodiment 1 by using the communication interface by executing the instructions stored in the memory.

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Abstract

The embodiment of the invention provides a method and a device for adjusting local carrier frequency, for solving the problem that in the prior art, the accuracy of demodulating a composite video signal is relatively low. The method comprises the steps of receiving a composite video signal, and determining a first phase difference between a local carrier and a chrominance subcarrier of the composite video signal, wherein the local carrier has first local carrier frequency; and when the first phase difference is determined to be more than a preset phase difference, adjusting the first local carrier frequency of the local carrier to be the second local carrier frequency, thus allowing a second phase difference between the adjusted local carrier and the chrominance subcarrier of the compositevideo signal to be less than the preset phase difference.

Description

technical field [0001] The invention relates to the field of analog video monitoring, in particular to a method and device for adjusting local carrier frequency. Background technique [0002] The analog high-definition video signal belongs to the composite video signal. If the receiving end wants to complete the demodulation of the composite video signal, it must restore the local carrier that can match the chroma subcarrier, so as to ensure that the image is demodulated well. Therefore, the chroma Subcarrier restoration is a key part in the demodulation of composite video signals. [0003] In the prior art, the chrominance subcarrier of the front-end camera is accurately known, and at the same time, with the aid of the phase identification and error correction method, ideally, the local carrier that matches the chrominance subcarrier can be restored and the correct image can be demodulated. However, on the one hand, due to the wide variety of analog cameras on the market, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/50H04N5/455H04L27/14H04L27/16
CPCH04L27/14H04L27/16H04N5/455H04N5/50
Inventor 杜兆胜崔根强朱乘风吕炳赟方伟
Owner 저장진셍일렉트로닉스테크놀러지컴퍼니리미티드