KR19990013444U - No signal and weak signal removal device in automatic channel setting - Google Patents

Abstract

The present invention relates to automatic channel setting of a television receiver. In particular, two channels tuned from the tuner circuit section store the channels for the no signal and the weak signal in the microcomputer's memory in 69 to 2 channels, thereby eliminating the no signal and the weak signal of the remote controller. By removing the channels for the no signal and the weak signal at the same time by using a button, the present invention relates to a no-signal and weak signal removal device in automatic channel setting so that channels having no and weak signals are not searched at the time of channel UP / DOWN. First, the video signal corresponding to each channel tuned through the tuner circuit part is automatically stored in the main IC after a certain process. In the two channels automatically memorized, 69 channels have no signal and weak signal removal buttons from the remote controller. When selected, only channels for no signal and weak signal are stored in the microcomputer's memory by the read mode operation of the main IC unit, and the channels for stored no signal and weak signal are removed all at once, thereby reducing the elimination time of no signal and weak signal. In addition, since no signal and weak signal are not searched when the channel is UP / DOWN, the user can feel the fatigue of the eyes less and can perform a quick search.

Description

No signal and weak signal removal device in automatic channel setting

The present invention relates to automatic channel setting of a television receiver. In particular, when setting 69 channels in two channels from the main tuner circuit part, channels for no-signal and weak signals of 60 dB or less are stored in a memory unit built into the microcomputer, and the remote controller By using the no-signal and weak-signal removal buttons provided in the unit, the no-signal and weak-signal stored in the memory unit are removed at once, so that no-signal and weak-signal are not checked at the time of channel up / down. Apparatus for removing no signal & weak signal in fixing auto channel.

In general, when the channel setting button included in the remote controller is input, the channel setting of the television receiver scans from 2 to 69 channels using only one tuner circuit unit and stores only the channel having the synchronization signal in the memory.

1 is a view schematically showing a general automatic channel setting apparatus.

1 shows a tuner circuit unit 10 for selecting a high frequency signal corresponding to a channel to be displayed on a CRT screen from a high frequency signal received through an antenna, converting it into an intermediate frequency, and amplifying it to generate a composite video signal, and the tuner circuit unit 10. ) Is connected to the image intermediate frequency detector 20 and the image intermediate frequency detector 20 for detecting the intermediate frequency of the image signal applied from the tuner circuit unit 10, and the image intermediate frequency detector 20 Is connected to the image processing unit 30 and the image processing unit 30 to process only the image signal in the composite image signal outputted from the DELTA, and drives the image signal to display the image signal applied from the image processing unit 30 on the CRT screen. CRT driving unit 40 to make, and

The microcomputer 50 is connected to the tuner circuit unit 10 and includes a microcomputer 50 for applying a control signal for setting a channel from the tuner circuit unit 10 and a memory 50a embedded in the microcomputer 50 for storing the set channel.

Referring to the channel setting apparatus of a general television as described above is as follows.

First, according to the related art, when a viewer switches on a television, an image of a broadcast program received through an antenna is displayed on a screen. That is, the high frequency signal corresponding to the selected channel among the high frequency signals received through the antenna is applied to the tuner circuit unit 10. The image signal tuned and output from the tuner circuit unit 10 is input to the intermediate frequency amplifier 20, and the intermediate frequency is amplified and transmitted to the image processor 30, and the image processor 30 Is separated into a luminance signal and a color signal from an input video signal, and the demodulated color signal is demodulated into an original color signal and output. The CRT driver 40 drives the image signal to display the image signal applied from the image processor 30 on the CRT screen.

On the other hand, the microcomputer 50 controls the tuner circuit unit 10 according to the signal for the automatic setting button applied from the remote controller (not shown), the memory 50a built in the microcomputer 50 is the tuner circuit unit 10 The channel set from) is saved.

Therefore, according to the automatic channel setting apparatus as described above, when the channel stored in the memory 50a of the microcomputer 50 is pressed on the channel UP / DOWN button provided in the remote controller, the channel for the no signal and the weak signal is also checked. There was a time-consuming inconvenience of searching.

Therefore, the present invention has been devised to solve the above problems, and an object of the present invention is to set 69 channels in 2 channels through the tuner circuit in the channel setting of the television receiver, and store them in the main demodulation IC. Channels for no signal and weak signal among the stored two channels from 69 channels are stored in the microcomputer's memory by using the read mode of the main IC unit. The channel for the no signal and the weak signal are removed at a time, thereby providing an apparatus for removing the no signal and the weak signal during automatic channel setting so that only a channel having a signal is checked when the channel is UP / DOWN.

1 is a view schematically showing a conventional automatic channel setting apparatus.

Figure 2 is a schematic diagram showing a device for removing the no signal and weak signal in the automatic channel setting of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: tuner circuit 20: intermediate frequency amplifier

30: image processing unit 40: CRT driving unit

50: micom 50a: memory

60: Y / C separation part 70: main IC part

80: signal detector

The present invention for achieving the above object is a tuner circuit unit for converting a high frequency signal corresponding to the selected channel to be displayed on the screen of the high frequency signal received through the antenna to an intermediate frequency suitable for amplification; An intermediate frequency amplifier unit connected to the tuner circuit unit and amplifying an intermediate frequency applied from the tuner circuit unit; A Y / C separation unit connected to the intermediate frequency amplifier and separating the composite video signal, which is an intermediate frequency applied from the intermediate frequency amplifier, into a luminance signal and a color signal; A main IC unit connected to the Y / C separator and demodulating the luminance signal and the color signal applied from the Y / C separator to be displayed on the screen through the water pipe drive; A CRT driver connected to the main IC unit to drive a signal applied from the main IC unit to be displayed on a CRT screen; And a signal detector for detecting a signal for the non-signal and weak signal output from the intermediate frequency amplifier; A microcomputer connected to the signal detector and detecting an AFT (Automatic Fine Tuning) signal of the intermediate frequency amplifier part when the signal is applied from the signal detector; By the control signal of the microcomputer by using the read mode of the main IC unit consists of a memory unit built in the microcomputer to store the serial data and the serial clock for each channel corresponding to the no signal and weak signal.

2 is a view schematically showing an apparatus for removing a no signal and a weak signal in automatic channel setting according to the present invention.

Referring to FIG. 2, a device for removing a no signal and a weak signal during automatic channel setting having the above configuration will be described.

First, when the viewer switches on the power of the television, the high frequency signal corresponding to the channel selected by the tuner circuit unit 10 among the high frequency signals received through the antenna is converted into an intermediate frequency suitable for amplification. The intermediate frequency amplifier 20 connected to the tuner circuit unit 10 amplifies the intermediate frequency applied from the tuner circuit unit 10 to a level suitable for signal processing and is applied to the Y / C separation unit 60. The Y / C separator 60 separates an intermediate frequency into a luminance signal and a color signal, and outputs the luminance signal to the main IC unit 70 through a luminance signal output terminal (Y signal), and the color signal is output to a color signal output terminal ( C signal) to the main IC unit 70. The CRT driver 40 connected to the main IC unit 70 performs a driving operation such as horizontal deflection or vertical deflection so that an image signal can be displayed on the CRT screen.

When the channel setting button is applied from the outside (remote controller: not shown) in the flow of the video signal as described above, a channel corresponding to each frequency tuned by the tuner circuit unit 10 is stored in the main IC unit 70. On the other hand, in order to remove the channels for the no signal and the weak signal at one time, the signal detector 80 detects the no signal and the weak signal from the signal output from the intermediate frequency amplifier 20. When the signal detection unit 80 detects a signal for no signal and a weak signal, the signal is applied to the microcomputer 50, and the electrical signal of the AFT from the intermediate frequency amplifier 20 is transferred to the microcomputer 50. The input is fed back to the tuner circuit unit 10 to compensate for the signal. For the channel in which the no signal and the weak signal are stored in the main IC unit 70, the serial data SDA and the serial clock SCL of the no signal and the weak signal are read using the read mode of the main IC unit 70. It is stored in the memory 50a built in the microcomputer 50 through.

Therefore, when the non-signal and weak signal removing button provided in the remote controller (not shown) is selected, the channels in which the no-signal and the weak signal stored in the memory 50a of the microcomputer 50 are stored can be removed at once. By removing the no signal and the weak signal assigned to each channel as described above, the channel for the no signal and the weak signal is not selected at the time of channel up / down, and only the channel where the strong signal, that is, the video signal exists, is the channel UP / DOWN. To be.

As can be seen from the above description, the present invention allows two channels tuned through the tuner circuit section to automatically store 69 channels in the main IC section, and when the no signal and weak signal removal button is selected from the remote controller, the lead of the main IC section is selected. Of the 69 channels that are automatically memorized by using the mode, only the channels corresponding to the no signal and the weak signal are stored in the memory of the microcomputer and removed at once, so that the no signal and the weak signal are not searched at the time of channel up / down. It is effective in reducing the fatigue and speeding up the search.

Claims (2)

A tuner circuit unit 10 for converting a high frequency signal corresponding to a selected channel to be displayed on a screen among high frequency signals received through an antenna into an intermediate frequency suitable for amplifying; An intermediate frequency amplifier 52 for amplifying an intermediate frequency applied from the tuner circuit unit 10; A Y / C separator 54 for separating a complex video signal, which is an intermediate frequency applied from the intermediate frequency amplifier 52, into a luminance signal and a color signal; A main IC unit 56 which demodulates the luminance signal and the color signal applied from the Y / C separator 54 to be displayed on the CRT screen through the CRT driver 40; A signal detector (60) for detecting a weak signal among the signals output from the intermediate frequency amplifier (52) to the Y / C separator (54); In the automatic channel setting device comprising a microcomputer 62 for detecting the AFT signal from the intermediate frequency amplifier 52 by the signal applied from the signal detector 60, The main IC unit 70 automatically stores the video signal for each channel tuned by the tuner circuit unit 10, and when the no signal and weak signal removing button of the remote controller (not shown) is selected, the main IC unit 70 automatically stores the video signal. An apparatus for removing no and weak signals in automatic channel setting, characterized in that only the channels for the no signal and the weak signal among the 69 channels are stored in the memory (50a) of the microcomputer (50) by the read mode function of the main IC unit. According to claim 1, the microcomputer 50 receives the AFT signal from the intermediate frequency amplifier 20 when the signal for the non-signal and weak signal is applied from the signal detector 80, the main IC unit 70 of the And a serial signal and a serial clock for the channel of the no signal and the weak signal in the read mode in the memory (50a) of the microcomputer (50).