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Analog TV signal processing method and device

An analog signal and analog TV technology, applied in the field of digital information transmission, can solve problems such as poor signal quality and IQ imbalance of analog TV signals, and achieve the effect of improving signal quality

Active Publication Date: 2021-05-18
ALTO BEAM (CHINA) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a method and device for processing analog TV signals to solve the problem of poor signal quality caused by IQ imbalance of analog TV signals

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  • Analog TV signal processing method and device
  • Analog TV signal processing method and device

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Embodiment Construction

[0029] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0031] It should be noted that the terms "first" and "second" in ...

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Abstract

The invention discloses an analog TV signal processing method and device. The method includes: converting the frequency of the received analog TV signal to an intermediate frequency to obtain an intermediate frequency analog signal; judging whether the intermediate frequency analog signal has an adjacent frequency that satisfies a preset condition; if there is, performing pre-filtering on the intermediate frequency analog signal to obtain a Filtering the signal; performing IQ imbalance estimation on the pre-filtering signal to obtain an estimation result; performing digital phase-locked loop processing on the estimation result to obtain a digital phase-locked signal; performing IQ compensation to the digital phase-locked signal to obtain a compensation signal. Through the invention, the effect of improving the quality of the analog TV signal is achieved.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to an analog television signal processing method and device. Background technique [0002] Analog TV signals are generally composed of image signals and audio signals. The image signal is VSB amplitude modulated (VSB), while the audio signal is frequency modulated. In my country, whether it is cable TV or wireless open-circuit transmission, the frequency band of a radio frequency TV signal occupies a bandwidth of 8MHz. The residual carrier frequency of the image is called luma frequency, which is 1.25MHz away from the left edge of the frequency band in terms of 8MHz bandwidth. Under 8MHz bandwidth, it is equivalent to a distance of 2.75MHz from the center frequency point; the sound carrier frequency is 6.5MHz higher than the image carrier frequency (8MHz bandwidth Down). [0003] IQ imbalance refers to the fact that when the receiver with an orthogonal st...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/14H04N5/213H04N5/44
CPCH04N5/14H04N5/213H04N5/44
Inventor 朴成哲
Owner ALTO BEAM (CHINA) INC