Method and device for demodulating analogue television signal
A technology for simulating TV and signals, applied to color TV components, TV system components, TVs, etc., can solve problems such as dependence and clear images, and achieve the effect of improving receiving sensitivity
Inactive Publication Date: 2014-05-07
江苏江阴靖江工业园区益阳商贸有限公司
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Problems solved by technology
One of the problems is that in a complex mobile environment, the quality of the analog TV signal received by the mobile terminal depends on the sensitivity of the mobile terminal to receive the signal. The higher the sensitivity of the mobile terminal to receive the signal, the clearer the image will be
[0008] However, in the prior art, how to improve the sensitivity of the mobile terminal to receive signals needs to be improved urgently.
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Embodiment Construction
[0042] The inventor of the present application overcomes the prejudice of the prior art, adopts the coherent demodulation method to demodulate the analog TV signal, and overcomes the problem of mistaking the croma or spur as the center frequency of the luma when the coherent demodulation method is used.
[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0044] figure 1 It is a flowchart of a method for demodulating an analog television signal according to an embodiment of the present invention. The method uses coherent signals to coherently demodulate received analog television signals, wherein the method for determining the frequency of the coherent signals includes:
[0045] In step 101, the theoretical carrier frequency of the analog TV signal is used as the frequency of the coherent signal....
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The invention discloses a method and a device for demodulating an analogue television signal. The method comprises the following steps of: performing coherent demodulation on the received analogue television signal by utilizing a coherent signal; taking the theoretical carrier frequency of the analogue television signal as the frequency of the coherent signal; and tracking the carrier frequency of the analogue television signal, judging whether a deviation between tracking result frequency and the theoretical carrier frequency of the analogue television signal is within a preset range or not, and taking the tracking result frequency as the frequency of the coherent signal if the deviation between the tracking result frequency and the theoretical carrier frequency of the analogue television signal is within the preset range. By the technical scheme provided by the invention, the analogue television signal is demodulated by adopting a coherent demodulation method, and receiving sensitivity is improved.
Description
technical field [0001] The invention relates to the technical field of wireless television broadcasting, in particular to a method and device for demodulating analog television signals. Background technique [0002] At present, there are many wireless TV broadcasting standards, such as Digital Video Broadcasting (DVB, China Mobile Multimedia Broadcasting), China Mobile Multimedia Broadcasting (CMMB, China Mobile Multimedia Broadcasting), etc., as well as traditional analog TV broadcasting systems. Among them, as far as the world is concerned, the most widely used is the analog TV system. At present, a chip the size of a soybean can be used to realize all reception and decoding work of analog TV. [0003] The image signal for analog television is an amplitude modulated (AM) signal. Generally, there are two demodulation methods for AM modulated signals: envelope detection and coherent demodulation. Theoretically, coherent demodulation has stronger demodulation ability than e...
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IPC IPC(8): H04N5/44H04N5/50
Inventor 张辉王西强曹晋宇胡伟
Owner 江苏江阴靖江工业园区益阳商贸有限公司