CN1463142A - Changeable tabulation typed high-speed method for searching TV stations in full range - Google Patents

Abstract

Base on the transmitting features of a TV station, the list of TV channels filtered out is stored in ROM or EEPROM. The channel list in EEPROM can be carried out adding, modifying and deleting operations etc. by operating a menu of TV channel list. The invention also discloses a method for searching TV stations in whole range at high speed. That is to say the search is carried out in the TV channels listed, ignoring the channels not in the list so as to speed up searching speed greatly. Since AFC voltage recognition is not needed, thus, the hardware design is simplified.

Description

TV changeable tabulation type high-speed method for searching TV stations in full range

Technical field

The technical field of the invention is the TV manufacturing industry, specifically is the high-speed method for searching TV stations in full range of TV.

Background technology

Countries in the world are in order separately to set different channels with different TV programme at present, and each channel and pairing frequency values are national standards, and the program that TV station sends must be to send by the frequency in the channel table.Television set then need with the television program search in playing to and store away selection for the user, how to search the problem that all programs become television design fast and accurately.

Traditional TV channel search method is that frequency values is increased by the speed of 30K-40K, near the strongest Frequency point of signal searching this frequency during to synchronizing signal more back and forth along AFC (automatic frequency control) voltage curve in certain frequency detecting.This method can search program accurately, but the spent time is also very long, often needs when the user searches platform to have waited for that a few minutes could begin to appreciate program.

Summary of the invention

The present invention is according to the characteristics of TV station's emission, filter out the television channel search listing in optimized mode, ignore other a large amount of frequencies of not tabulating, reduce consumed time on unnecessary frequency like this, the speed of searching platform is tapered to 20～30 seconds from 4～8 minutes of conventional method, search platform speed and improve 10～20 times, saved the time that the user waits for greatly in searching the platform process thereby make, make and search the platform process and finish, improve the serviceability of TV in moment.Simultaneously because of not needing AFC (automatic frequency control) voltage identification, so more simplified the design of hardware.The present invention can also upgrade channel list as required, is primarily aimed at television set producer and can not determine exporting country, for compatible countries in the world television channel is established.Leave among the EEPROM in advance when the channel list that exports country of destination is exported, set up change frequency menu simultaneously, make user or maintenance personal revise channel list by remote controller, thereby the realization TV is sold for the channel list function of can oneself upgrading in the user family, solution repartitions television channel with the technical development various countries or channel is made in user's interpolation by oneself, and can't upgrade tabulation so that leak the platform problem.

Task of the present invention adopts following technical proposal to finish.Be stored in television channel lists in the CPU read only memory ROM when at first television set is produced or be stored among the EEPROM, as can be in the CPU read-only memory with the Chinese television channels list storage, and TV is exported the list storage of country of destination in EEPROM, use the television channel lists in the read-only memory that is solidificated in CPU during the TV set to search programmes sold at home, use the television channel lists be stored among the EEPROM during TV set to search programmes of outlet, can realize that like this tv channel list is renewable with the national difference of outlet, and do not need to change again CPU, also the channel table that oneself defines can be deposited among the EEPROM in addition, realizing the search of special channel, as the game machine channel etc.

If TV user or producer need change the television channel lists that is stored among the EEPROM after television set production then, can revise by operation television channel lists menu.TV is revised the channel list menu and is comprised totally 5 of channel, frequency, modification, insertion, deletions.

Television set is revised the method for channel list, comprises the following steps: 1) use television set guidance panel or remote controller to open modification channel list menu; 2) by selecting channel by last or following key; 3) revise by a left side or right button and want the channel that is inserted into to subtract 1, add 1 by the right button channel by the left button channel; 4) select the frequency item by last or following key; 5) press numerical key incoming frequency value, scope is tuner range of receiving 30.00MHz～950.99MHz; 6) select modification item or insert item or deleted entry by last or following key; 7) be saved among the EEPROM by a left side or this channel information of right button,, so only will revise back information and deposit the current channel position if selection is modification item; If selection is to insert item, the channel number with channel list adds 1 also preservation so, moves 1 unit behind the channel information after current channel is reached, and information is deposited the current channel position after will revising again; If what select is deleted entry, then delete current channel information, method is channel number to be subtracted 1 also preserve, 1 unit of channel information reach that current channel is later is saved among the EEPROM; 8) repeat the 2-7 step, revise all channels; 9) withdraw from menu.

Just can utilize television channel lists to carry out high speed whole process then and search platform, channel search method comprises the following steps: that (1) search platform and begin, and establishes n=1; (2) read EEPROM mid band table selection marker, deposit in the CPU table mask register; (3) judge whether the table mask register selects the tabulation among the EEPROM,, otherwise from the CPU read-only memory, take out channel number, and deposit in the CPU channel number register if then from EEPROM, read channel number; (4) judge whether the table mask register selects the tabulation among the EEPROM,, otherwise from the CPU read-only memory, take out n frequency values if then from EEPROM, read n frequency values; (5) frequency values is write tuner, make it be operated in this Frequency point; (6) wait for that 200 milliseconds allow signal stabilization; (7) detection has or not line synchronizing signal, and having then changeed for (8) step, does not have and then changes for (10) step; (8) programs stored information; (9) judge whether programme information is full, be then to change for (12) step, otherwise changeed for (10) step; (10) n=n+1; (11) whether judging n greater than channel number, is then to change for (12) step, continues search otherwise changeed for (4) step; (12) searching platform finishes;

Description of drawings

Fig. 1 revises the channel list menu.

Fig. 2 is that high speed whole process is searched the platform flow chart.

Embodiment

Below be the program of one embodiment of the invention, in order to further specify the present invention.But the present invention is not imposed any restrictions.Other programs of making under technical scheme of the present invention all fall into protection scope of the present invention.

Unsigned char n, // channel number g_search_timer, // search platform waiting register g_tunerl_st, // platform status register which_table searched, // tabulation mask register unsigned int code tv_channel_table[]=95, // channel number 497,577,657,772,852,1122,1202,1282,1362,1442, // frequency meter 1522,1602,1682,1762,1842,1922,2002,2082,2162,2242,2322,2402,2482,2562,2642,2722,2802,2882,2962,3042,3122,3202,3282,3362,3442,3522,3602,3682,3762,3842,3922,4002,4082,4162,4242,4322,4402,4482,4562,4642,4712,4792,4872,4952,5032,5112,5192,5272,5352,5432,5512,5592,6072,6152,6232,6312,6392,6472,6552,6632,＜!--SIPO＜DP n=" 3 "〉--〉＜dp n=" d3 "/6712,6792,6872,6952,7032,7112,7192,7272,7352,7432,7512,7592,7672,7752,7832,7912,7992,8072,8152,8232,8312,8392,8472,8552,8632}/*-----------------------------; FAST SEARCH;----------------------------*/void fast_search () { whitch_table=read_eeprom_1byte (WHITCH_TABLE_ADDRESS); // read channel table selection mode if (which_table==0) // select channel list if (n＞tv_channel_table[0]) // check whether surpass list length g_tunerl_st=22; // enter and search for done state return; Tunerl_pll.freq=tv_channel_table[n+1]; // read inner channel list frequency values } else{ if (n＞read_eeprom_1byte (TV_CHANNEL_ADDRESS); ) // check whether surpass list length g_tunerl_st=22; // enter and search for done state return; Tunerl_pll.freq=read_eeprom_2byte (TV_CHANNEL_ADDRESS+n*2+1); // read EEPROM channel list frequency values } tuner_write (); // frequency information is write tuner g_search_timer=C_200MS4; // time of staying return is set; Void main_tuner () { switch (g_tunerl_st) {/* fast search*/case 18:n=0; // set since 0 channel fast_search (); // write first channel g_search_timer=C_200MS4; // setting the stand-by period ++ g_tunerl_st; Break;＜!--SIPO＜DP n=" 4 "〉--〉＜dp n=" d4 "/{ // stand-by period is mistake, and signal has been stablized if (sync_check ()), and { // inspection has or not synchronizing signal save_channel () for case 19:if (g_search_timer==0); // signal is arranged, is { // inspection programme information filled with recorded program information if (check_pos_is_full ())? g_tunerl_st=22; // enter and search the platform done state else fast_search (); // continue to search platform } else fast_search (); // continue to search platform } break; Case 22:return_to_nomal (); // search platform end process break;

Claims (2)

1. television set is revised the method for channel list, comprises the following steps: 1) use television set guidance panel or remote controller to open modification channel list menu; 2) by selecting channel by last or following key; 3) revise by a left side or right button and want the channel that is inserted into to subtract 1, add 1 by the right button channel by the left button channel; 4) select the frequency item by last or following key; 5) press numerical key incoming frequency value, scope is tuner range of receiving 30.00MHz～950.99MHz; 6) select modification item or insert item or deleted entry by last or following key; 7) be saved among the EEPROM by a left side or this channel information of right button,, so only will revise back information and deposit the current channel position if selection is modification item; If selection is to insert item, the channel number with channel list adds 1 also preservation so, moves 1 unit behind the channel information after current channel is reached, and information is deposited the current channel position after will revising again; If what select is deleted entry, then delete current channel information, method is channel number to be subtracted 1 also preserve, 1 unit of channel information reach that current channel is later is saved among the EEPROM; 8) repeat the 2-7 step, revise all channels; 9) withdraw from menu.

2. television set high-speed method for searching TV stations in full range comprises the following steps: that (1) search platform and begin, and establishes n=1; (2) read EEPROM mid band table selection marker, deposit in the CPU table mask register; (3) judge whether the table mask register selects the tabulation among the EEPROM,, otherwise from the CPU read-only memory, take out channel number, and deposit in the CPU channel number register if then from EEPROM, read channel number; (4) judge whether the table mask register selects the tabulation among the EEPROM,, otherwise from the CPU read-only memory, take out n frequency values if then from EEPROM, read n frequency values; (5) frequency values is write tuner, make it be operated in this Frequency point; (6) wait for that 200 milliseconds allow signal stabilization; (7) detection has or not line synchronizing signal, and having then changeed for (8) step, does not have and then changes for (10) step; (8) programs stored information; (9) judge whether programme information is full, be then to change for (12) step, otherwise changeed for (10) step; (10) n=n+1; (11) whether judging n greater than channel number, is then to change for (12) step, continues search otherwise changeed for (4) step; (12) searching platform finishes;