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Searching method for TV programme signal

A technology for TV programs and search methods, which is applied to components of color TVs, components of TV systems, TVs, etc., can solve the problems of missing channels, slow channel search speed, and missing channels of TV signals, and achieves short search time. Effect

Inactive Publication Date: 2005-04-27
PANDA ELECTRONICS GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The search speed is slow. At present, it generally takes more than 3 minutes to search from more than 40 MHz to more than 960 MHz, and it takes more than 2 minutes if the speed is faster.
[0004] 2. For the tuner of frequency synthesis, there is still a problem of frequency table when searching for channels. The program of different frequency tables often needs to be modified, which will bring great inconvenience in actual use.
There will also be a problem of channel leakage due to the TV signals of non-standard frequencies being sent in some places
[0005] 3. The existing method is to search at a wider frequency interval, which often has the problem of searching more or less, resulting in false and missed stations

Method used

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  • Searching method for TV programme signal

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Experimental program
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Effect test

Embodiment Construction

[0010] 1. Send the initial frequency (such as 44.75MHz) to the tuner, after waiting for the normal time (A);

[0011] 2. Detect the AFT value, such as figure 1 , assuming that A is the frequency of the channel, the AFT value between B and C indicates that there may be a station, and it is supplemented by line synchronization to determine whether there is a station;

[0012] 3. If there is a station, save the frequency of the station, add 3-4MHz to the frequency, and delay for a short time (B), special 2;

[0013] 4. If there is no station, add 50KHz to the frequency, after a very short delay (C), special 2;

[0014] 5. Repeat 2~4 until the frequency reaches the stop frequency (such as 961MHz), and stop searching.

[0015] The present invention has several key points:

[0016] 1. A of the above three waiting times is the longest (600-800 milliseconds), B is the shortest (about 20 milliseconds), and C is extremely short (about 1 millisecond);

[0017] 2. When debugging the m...

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Abstract

The TV program signal searching method includes feeding the initial frequency to the tuner, waiting for one normal time A, detecting AFT value and judging whether to have station there with auxiliary line frequency signal; if yes, maintaining the frequency of the station; increasing frequency by 3-4 MHz, if no, increasing frequency by 50 KHz, delaying for very short time C and judging whether to have station there; and repeating the above said steps until reaching the ultimate frequency and stopping search. The TV program signal searching method has one search time of 60-70 sec from 44.75 MHz to 961 MHz, has no frequency list problem, and is suitable for various area with different frequency list.

Description

technical field [0001] The invention relates to a search method for television program signals, that is, a channel search method for a television set. Background technique [0002] The TV station search function is a job that must be completed in TV design. Due to its own characteristics, the scope of its search is from the large frequency bandwidth of 40M-950M. There are always several major problems that are difficult to solve: the existing TV The search method of the program signal adopts a wide frequency interval such as progressive 8M (it is different according to the frequency table). Due to the characteristics of the tuner, it takes a long time to set the frequency, (the response of the tuner at each interval is increased The signal detection time should exceed 1 second). Therefore have following weak point: [0003] 1. The search speed is slow. At present, it usually takes more than 3 minutes to search from more than 40 MHz to more than 96...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44H04N5/50
Inventor 李立春
Owner PANDA ELECTRONICS GROUP
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