KR20000003680A - Method of automatically tuning a television broadcasting channel - Google Patents

Abstract

PURPOSE: A method of automatically tuning a television broadcasting channel is provided to enhance a performance of a television system by using a color burst counter of a television system. CONSTITUTION: The method comprises steps of: determining whether an automatic search signal is inputted or not; beginning an automatic search operation at one standard mode of PAL(Phase Alternation by Line) or SECAM(Sequential Couleur Amemoire); determining whether a broadcast signal exists or not within a search range(S303); determining whether a color burst count signal of the standard mode exists or not when the broadcast signal exists; changing a broadcasting mode a system in case that the color burst count signal does not exist to determine whether a color burst count signal exists or not(S309)(S305); and memorizing and searching the broadcasting signal(S306). Thereby, it is possible to automatically tune a broadcasting signal on both modes.

Description

Auto tuning method of TV broadcasting channel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV system, and more particularly, to a method for automatic tuning of a TV broadcast channel, which enables to simultaneously tune a broadcast signal in a positive mode (SECAM) and a negative mode (PAL) using a color burst counter.

One of the functions commonly used in TV systems is ATS (Automatic Tuning + System).

The ATS function is one of the basic functions used in a TV system and automatically tunes a channel using an ATS code assigned to each broadcasting station.

Standard modes of color TV broadcasting include SECAM and PAL.

SECAM (Sequentiel couleur amemoire) mode has a feature of sequentially storing color signals for each scan line, and PAL (Phase Alternation by Line) mode has a feature of inverting the vertical synchronization signal by 180 ° for each scan line.

Hereinafter, a TV system according to the related art will be described with reference to the accompanying drawings.

1 is a schematic block diagram of a general TV system, and FIG. 2 is a flowchart illustrating a channel tuning method of the prior art.

A schematic configuration of a TV system centering on a tuner section, which is a main processing block for channel selection, is as follows.

The tuner unit 10 is output from the filter 1 by using a filter 1 for filtering the received signal amplified and received from the antenna, and an AGC (Automatic Gain Control) signal output during IF (Intermediate Frequency) demodulation. An RF amplifying unit 2 for amplifying a filtering signal (RF), an RF tuning unit 3 for selecting only a signal of a desired channel as an input from the signals output from the RF amplifying unit 2, and an RF tuning unit The mixer 4 is composed of a mixer 4 for mixing and outputting an RF tuning signal and an oscillation frequency outputted at (3), and an IF demodulator 5 for IF demodulating and outputting the mixed signal.

The blocks for processing and displaying broadcast signals output from the tuner unit 10 include a TV system controller 12 for controlling the entire TV system and an external user input control signal through the TV system controller 12. Process to display the selected broadcast signal output from the tuner unit 10 under the control of the control signal input unit 11, the OSD (On Screen Display) unit 13 on the character display, and the TV system control unit 12. And a display unit 15 for displaying the video signal output from the TV video signal processor 14 to the outside.

One of the main functions of the TV system configured as described above is the ATS (Automatic Tuning System) function.

The ATS function automatically tunes a broadcast signal of a desired channel and is described with reference to FIG. 2 as follows.

The channel tuning method of the prior art searches for a broadcast signal by recognizing a negative mode and a positive mode, respectively.

First, if the program tuning mode is executed in the state in which the broadcast signals of the negative mode and the positive mode exist at the same time (201S), one broadcast mode must be selected from the two broadcast modes, since a search for each tuning is required. )

Subsequently, it is determined whether a broadcast mode is selected (203S), and if one broadcast mode is selected, a broadcast signal (or a program) related to the selected first broadcast mode is searched (204S).

If the tuning is continued by searching for the broadcast signal of the first broadcast mode (205S), the second broadcast mode is selected again (206S).

Subsequently, it is determined whether a broadcast mode is selected (207S), and if another broadcast mode is selected, a broadcast signal (or a program) related to the selected second broadcast mode is searched (208S).

Subsequently, if the tuning is completed by searching for the broadcast signal of the second broadcast mode (209S), the tuning results of the two modes of the positive mode and the negative mode are stored and the channel tuning operation is completed (210S).

In the channel tuning method of the prior art, channel tuning must be performed according to each mode of the negative mode and the positive mode.

This is because there is no special means of accurately recognizing negative and positive modes.

The channel tuning method of the prior art has the following problems.

First, it is necessary to determine whether or not a signal is present at the time of channel tuning, and then, the search and storage operations must be performed according to the broadcast mode.

Second, due to the influence of miscellaneous signals during the search process, the tuning is not performed accurately, thus affecting the whole TV system.

The present invention is to solve the problem of the channel selection method of the prior art, a TV broadcast channel that is capable of simultaneously tuning the broadcast signal of the positive mode (SECAM) and negative mode (PAL) using a color burst counter. The purpose is to provide an automatic tuning method.

1 is a view schematically showing a blow configuration of a general TV system

2 is a flowchart illustrating an operation of a channel tuning method according to the related art.

3 is a flowchart illustrating an operation of a channel tuning method according to the present invention.

The automatic tuning method of the TV broadcast channel of the present invention, which enables the simultaneous broadcasting of the positive mode (SECAM) and the negative mode (PAL) broadcast signals using a color burst counter, executes the automatic tuning function to automatically search for channel tuning. Determining whether a signal has been input, starting an automatic search operation in one of the reference modes of the current PAL or SECAM, and determining whether a broadcast signal is detected within the search range, and if the broadcast signal is detected, the reference mode. Determining whether there is a color burst count signal, and if there is no color burst count signal in the reference mode, changing the broadcast mode and system to determine whether there is a color burst count signal, and if there is a color burst count signal, in order of frequency. Memory and searching to determine whether the broadcast signal is still present And, if there is a broadcast signal, determining whether there is a color burst count signal until the last frequency becomes 860 mu s, and if there is no broadcast signal, completing automatic tuning.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the automatic tuning method of the TV broadcast channel according to the present invention.

3 is a flowchart illustrating a channel tuning method according to the present invention.

Currently, the TV system uses I ² C-BUS LINE to transfer all information between the microcomputer and the main IC that controls the entire TV system, enabling accurate recognition of the positive and negative modes.

In the present invention, the color burst counter is used as the means for recognizing the positive mode PAL and the negative mode SECAM.

The channel tuning method first executes the automatic tuning function (301S) to determine whether an automatic search signal for channel tuning is input (302S).

Subsequently, if it is determined that the automatic search tuning signal is input, the automatic search operation is started in the current reference mode (PAL or SECAM).

Then, it is determined whether a broadcast signal is detected within the search range (304S).

Then, when the broadcast signal is detected, it is determined whether there is a color burst count signal in the PAL or SECAM mode.

If there is no color burst count signal in the PAL or SECAM mode, the broadcast mode and the system are changed (309S) to determine whether there is a color burst count signal in the PAL or SECAM mode.

Subsequently, if there is a color burst count signal in the PAL or SECAM mode, memory and search are performed in order of frequency (306S).

The channel tuning process is performed in order of frequency, and it is determined whether the broadcast signal is still present.

If the broadcast signal is still present, it is determined whether or not there is a color burst count signal in PAL or SECAM mode until the last frequency is 860μkHz.

If there is no broadcast signal, automatic tuning is completed (311S).

In this channel tuning operation, automatic search is started (303S), and if the broadcast signal is not detected within the search range, the method further includes detecting (310S) the broadcast signal.

The automatic tuning method of the TV broadcasting channel according to the present invention can simultaneously perform channel tuning in these modes regardless of the positive mode or the negative mode.

It usually takes about 10 minutes to tune a channel in a TV system within 5-6 minutes, and can increase the ratio of signal-to-noise signals from less than 50% to more than 75%.

The automatic TV broadcasting channel tuning method according to the present invention has the following effects.

First, regardless of the PAL or SECAM mode, the search and memory operations must be simultaneously recognized and proceeded at the time of channel selection, thereby reducing the time required for searching.

Second, in the search process, the tuning is performed accurately by reducing the influence of the signal jam.

This improves the overall performance of the TV system has the effect of improving the user convenience and product merchandise.

Claims (1)

Executing an auto tuning function to determine whether an auto search signal for channel tuning is input; Starting an auto-discovery operation in either reference mode of the current PAL or SECAM, Determining whether a broadcast signal is detected within a search range and determining whether there is a color burst count signal in a reference mode when the broadcast signal is detected; If there is no color burst count signal in the reference mode, changing the broadcast mode and system to determine whether there is a color burst count signal again; If there is a color burst count signal, storing and searching in frequency order and determining whether the broadcast signal is still present; And if there is a broadcast signal, determining whether there is a color burst count signal until the last frequency is 860 mu s, and if there is no broadcast signal, completing the auto tuning.