KR20000045190A - Method for performing automatic search in television receiver - Google Patents

Abstract

PURPOSE: A method for performing automatic search in a television receiver is provided to perform automatic search for broadcasting channels in order to select only a channel with the best reception sensitivity. CONSTITUTION: A method for performing automatic search in a television receiver comprises the steps of: changing sequentially channel to perform automatic search if an automatic search mode is selected; storing selection data and ATS codes of the detected broadcasting channel; determining whether the automatic search is finished; determining whether a channel having the same ATS codes exists if the automatic search is finished; determining whether AGC levels of each channel is compared if the channel having the same ATS codes exists; comparing the AGC levels of each channel and selecting selection data of a channel having the strongest reception signal and erasing selection data of the remaining channels if the AGC levels of each channel is compared; and selecting only selection data of a first selected channel and erasing the remaining selection data if the AGC levels of each channel is not compared.

Description

An auto-search method of a television

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-search method of a television receiver, and in particular, each receiver (KBS first television broadcast, KBS second television broadcast, MBC broadcast, SBS broadcast, EBS broadcast, etc.) has the best reception sensitivity. The present invention relates to an auto search method of a television receiver in which only one channel is selected.

In general, a television receiver receives a radio signal transmitted from a broadcasting station, a CATV (CAble TeleVision), or an external A / V (Audio / Video) input, and displays an image on the screen, and a user operates a remote control transmitter or a key panel. It is possible to select and adjust broadcasting channel, volume, contrast, brightness, etc.

The above-described television receiver is equipped with various functions, one of which is an "autosearch" function of automatically tuning a broadcast channel. The auto search function searches for channels in which a broadcast signal is detected while the microcomputer provided in the television receiver varies the tuning voltage applied to the tuner, and selects a broadcasting channel by storing tuning data (tuning voltage, channel number, etc.) of the corresponding channel. It is a function to make it easy.

However, conventionally, since all channels for which a broadcast signal is detected at the time of auto search are tuned, a plurality of channels for receiving the same broadcast are often tuned. Therefore, there is a problem that a user may experience inconvenience when selecting a desired broadcast channel.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. When multiple channels receiving the same broadcast are tuned as a result of the auto search, the AGC (Automatic Gain Control) level of each channel is compared and the received signal is the highest. It is an object of the present invention to provide an auto-search method of a television receiver in which only one channel is tuned for each broadcast by deleting the preset data or the preset data of the first channel.

In order to achieve the above object, in the auto search method of a television receiver according to the present invention, if the auto search mode is selected, the auto search is performed while sequentially changing channels, and the channel selection data and the ATS of the channel where the broadcast signal is detected. (Auto Tuning System) storing the code, determining whether the auto search is completed, determining whether a channel having the same ATS code exists when the auto search is completed, and having a channel having the same ATS code If it is possible to compare the AGC level of each channel, and if it is possible to compare the AGC level of the same channel with the same ATS code, the AGC level of each channel is compared to leave only the channel data of the channel with the strongest received signal. Deleting the preset data; if it is impossible to compare AGC levels of channels with the same ATS code, it is tuned first. With only the left channel selection data, wherein the step of deleting the tune data of the other channels provided.

1 is a schematic configuration diagram of a television receiver to which the present invention is applied;

2 is a flowchart of an autosearch process according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

102: tuner 104: IF demodulator

106: audio processor 108: audio amplifier

110: speaker 112: video processor

114: video amplifier 116: CRT

118: ATS decoder 120: Micom

122: remote control receiver 124: remote control transmitter

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a television receiver to which the present invention is applied, wherein the television receiver includes an antenna 100, a tuner 102, an intermediate frequency demodulator 104, an audio processor 106, Audio amplifier 108, speaker 110, video processor 112, video amplifier 114, CRT (Cathode Ray Tube, 116), ATS decoder 118, microcomputer 120, The remote control receiver 122 and the remote control transmitter 124 are provided.

The tuner 102 receives a radio frequency (RF) broadcast signal through the antenna 100 and generates an intermediate frequency (IF) signal of a channel selected by a predetermined international language signal input from the microcomputer 120. Output to IF demodulator 104.

The IF demodulator 104 demodulates a video intermediate frequency (VIF: 45.75 MHz) signal and an audio intermediate frequency (SIF: 41.25 MHz) signal received from the tuner 102, and then composite video and audio signals. Are output to the video processor 112 and the audio processor 106, respectively.

The audio processor 106 processes the audio signal received from the IF demodulator 104 according to the audio mode and outputs the audio signal to the audio amplifier 108.

The audio amplifier 108 amplifies the output signal of the audio processor 106 and outputs it to the speaker 110.

The video processor 112 separates the horizontal and vertical sync signals SYNC from the composite video signal input from the IF demodulator 104 and processes the luminance signal and the chrominance signal to process R (Red), G (Green), and B ( Blue signal is output to the video amplifier 114 and the ATS decoder 118, and horizontal and vertical synchronization signals SYNC are output to the ATS decoder 118 and the microcomputer 120, respectively. In addition, the video processor 112 generates an AGC signal for adjusting the amplification degree according to the strength of the received signal for each channel and provides it to the tuner 102 and the microcomputer 120.

The video amplifier 114 amplifies the R, G, and B signals received from the video processor 112 and outputs the amplified signals to the CRT 116.

The CRT 116 displays the screen of the received broadcast according to the output of the video amplifier 114.

The ATS decoder 118 counts the sync signal SYNC received from the video processor 112 to find the vertical blanking period of the received signal, detects the ATS signal in the signal input during the vertical blanking period, and then demodulates the ATS. The code is output to the microcomputer 120.

In general, a broadcasting station carries a unique code of a corresponding broadcasting station together with a text broadcasting signal in a vertical blanking period of the broadcasting signal, and this unique code is called an "ATS code". That is, KBS 1st TV station, KBS 2nd TV station, MBC station, SBS station, EBS station, etc. transmit their own ATS code in the vertical blanking period of the broadcast signal, so the broadcast receiving side receives the broadcast through a predetermined channel. When the ATS code on the signal is detected, it is easy to know whether the broadcast received through the corresponding channel is KBS first television broadcast, KBS second television broadcast, MBC broadcast, SBS broadcast, or EBS broadcast.

The microcomputer 120 controls the operation of the system according to the user's selection input through the remote controller transmitter 124 and the remote control receiver 122 or the user's selection through a key panel (not shown). In detail, when the auto search mode is selected, the microcomputer 120 selects a channel by outputting the international language signal to the tuner 102, and receives a sync signal SYNC from the video processor 112 when the predetermined channel is selected. Recognizing that the broadcast signal is detected, the channel selection data of the channel where the broadcast signal is detected and the ATS code received from the ATS decoder 118 are stored in the internal memory, respectively, while the synchronization signal SYNC is received from the video processor 112 when a predetermined channel is selected. If no) is received, the channel is skipped. In addition, the channel preset data stored in the internal memory of the microcomputer 120 includes the AGC signal level received from the video processor 112, the channel preset voltage applied to the tuner 102, and the channel number.

The remote control receiver 122 receives and demodulates a radio signal according to a key operation of the remote control transmitter 124 and outputs the demodulated signal to the microcomputer 120.

The remote control transmitter 124 includes an auto search key for selecting an auto search mode.

Based on the configuration of the television receiver as described above, the auto search process according to an embodiment of the present invention will be described in detail with reference to the flowchart shown in FIG. 2.

First, when the power of the television receiver is turned on (S201), the microcomputer 120 determines whether the auto search key included in the remote control transmitter 124 is selected through the input of the remote control receiver 122, that is, the auto search mode is selected. (S202).

If the auto search mode is selected as a result of the determination in step S202, the microcomputer 120 performs auto search while sequentially changing channels (S203). More specifically, the microcomputer 120 determines whether a broadcast signal is detected for each channel while sequentially changing channels by varying the international language signal applied to the tuner 102. In this case, when the predetermined signal is selected, the microcomputer 120 recognizes that the broadcast signal is detected from the video processor 112 when the synchronization signal SYNC is input. If the synchronization signal SYNC is not received, the broadcast signal is not detected. Recognize that you do not.

After the step S203, the microcomputer 120 stores the channel selection data and the ATS code of all channels where the broadcast signal is detected (S204).

After the step S204, the microcomputer 120 determines whether the auto search is completed (S205). If the auto search is not completed, the microcomputer 120 branches to the step S203 to continue the auto search, and when the auto search is completed, the plurality of channels tuned to are selected. It is determined whether a channel having the same ATS code exists (S206).

If the channel having the same ATS code does not exist as a result of the determination in step S206, the microcomputer 120 terminates the auto search mode, and if the same channel exists with the same ATS code, that is, if there is a channel receiving the same broadcast, AGC of each channel exists. It is determined whether level comparison is possible (S207).

As a result of the determination in step S207, if the ATS code can be compared with the AGC level of the same channel, that is, if there is a difference in the AGC level of each channel, the microcomputer 120 compares the AGC level of each channel to select the channel with the strongest received signal. Only the data is left but the preset data of the remaining channels are deleted (S208), and the auto search mode is terminated. For example, channel 5, channel 9, channel 27, and channel 47 tuned to the autosearch result are channels for receiving the KBS first television broadcast, and if the received signal of channel 9 is the strongest, the channel 9 data is selected. Tuning data of the remaining channels 5, 27, and 47 except for the above are deleted from the internal memory of the microcomputer 120.

On the other hand, if it is impossible to compare the AGC level of the same channel as the result of the determination in step S207, that is, if there is no difference in the AGC level of each channel, the microcomputer 120 will leave only the tuning data of the first channel selected and the remaining channels of the other channels. The preset data is deleted (S209), and the auto search mode is terminated. For example, if channel 11, channel 38, and channel 59 tuned to the autosearch result are channels in which MBC broadcast is received, the received signal strength of each channel is the same, and channel 11 is tuned to the channel 11 when channel 11 is tuned first. Tuning data of channels 38 and 59 except for the deletion are deleted from the internal memory of the microcomputer 120.

As a result of performing the auto search in steps S201 to S209, only one channel having the best reception sensitivity is selected for each broadcast (KBS first television broadcast, KBS second television broadcast, MBC broadcast, SBS broadcast, EBS broadcast, etc.). It is possible to select a desired broadcast channel more easily than conventionally.

As described above, the present invention allows multiple channels to receive the same broadcast to be tuned to only one channel having the best reception sensitivity for each broadcast by leaving only the channel having the highest reception sensitivity or the first channel selected first and deleting the rest. Therefore, there is an effect of allowing a user to select a desired broadcast channel more easily.

Claims (1)

If auto search mode is selected, performing auto search while sequentially changing channels; Storing the tuning data of the channel where the broadcast signal is detected and the ATS code, respectively; Determining whether auto search is complete; If the auto search is completed, the ATS code determines whether the same channel exists; Determining whether AGC levels of each channel can be compared when channels having the same ATS code exist; If it is possible to compare AGC levels of the same channels with the ATS code, comparing the AGC levels of each channel to delete the preset data of the remaining channels, leaving only the preset data of the channel with the strongest received signal; And if the ATS code is impossible to compare AGC levels of the same channels, leaving the tuning data of the first tuned channel and deleting the tuning data of the remaining channels.