KR0141732B1 - Auto-search method of tv receiver - Google Patents

Abstract

The present invention relates to an automatic search method of a TV receiver, which determines and stores only a broadcast signal having a good state of a broadcast signal during automatic search of a broadcast channel, and stores or erases a broadcast channel having a poor signal state by a conversation method with a user. It was made to be.

As described above, the present invention includes a process of searching for a broadcast signal input of a specific channel obtained by automatically tuning a tuner by backing up an initial tuning voltage and automatically tuning an initial tuner voltage; If a broadcast signal exists in the specific channel, searching for a signal state of the specific channel to determine whether to skip allocation or storage, increasing the channel to apply it to all broadcast channels, and broadcasting the specific channel after completion of searching for the broadcast channel. And displaying the program number and the skip assignment on the screen and storing the program number and the skip assignment as a skip or channel number according to a user's selection.

Description

Automatic search method of TV receiver

1 is a block diagram of an automatic search apparatus of a conventional TV receiver.

2 is an auto search signal flow diagram for explaining FIG.

FIG. 3 is a flowchart illustrating a process of determining whether a broadcast signal of FIG. 2 is present and performing automatic search.

4 is a waveform diagram of the identification signal and automatic tuning tuning voltage of FIG. 1, (a) is a waveform diagram showing the search speed mode, (b) is a waveform diagram of the identification signal, and (c) is an automatic tuning tuning voltage waveform. It is also.

5 is a block diagram of the automatic search device of the present invention TV receiver.

6 is an auto search signal flow diagram according to FIG.

FIG. 7 is a flowchart illustrating a process of determining whether a broadcast signal of FIG. 6 is present and performing automatic search.

8 is a table of program memory built into the microcomputer of FIG.

* Explanation of symbols for the main parts of the drawings

200: Tuner 201: Image intermediate frequency processing unit

202: microcomputer 203: deflection circuit

The present invention relates to automatic search for a broadcast channel of a TV receiver, and more particularly, to determine and store only a broadcast signal having a good broadcast signal state when the broadcast channel is automatically searched. The present invention relates to an automatic search method for a television receiver for storing or deleting in a conversation method.

As shown in FIG. 1, the automatic search apparatus of the conventional TV receiver includes: a tuner 100 tuned to a corresponding channel frequency according to an input tuning voltage; An image intermediate frequency processor (101) for processing the image and audio intermediate frequencies of the corresponding channel input and tuned from the tuner (100) to output an automatic tuning tuning voltage and a synchronization signal; A deflection circuit 103 for processing and outputting a synchronization signal processed and input by the image intermediate frequency processor 101; And a microcomputer 102 for fine tuning the channel by searching for the automatic tuning tuning voltage from the image intermediate frequency processor 101 and the presence of a synchronization signal from the deflection circuit 103.

The automatic search apparatus of the conventional TV receiver configured as described above will be described in detail with reference to FIGS. 1 to 4.

First, when the user turns on the power through the remote controller or the key control unit to automatically memorize the channel and inputs the auto channel storage key (step ST100), the microcomputer 102 is assigned to the current channel number, that is, the initial center frequency. The corresponding tuning voltage (first channel band selection voltage) is backed up (step ST101) and input to the tuner 100 (step ST102).

The tuner 102 tunes the broadcast signal received from the antenna to the corresponding channel according to the tuning voltage input from the microcomputer 102 and inputs it to the image intermediate frequency processor 101.

The image intermediate frequency processing unit 101 processes and outputs the image and audio intermediate frequencies of the corresponding channel input and tuned from the tuner 100, and detects the automatic tuning tuning voltage and the synchronization signal to automatically output the microcomputer 102. Input to the tuning tune terminal (AFT) and input to the deflection circuit (103).

The deflection circuit 103 detects a synchronization signal from the broadcast signal processed by the image intermediate frequency processor 101 and inputs it to the identification terminal ID of the microcomputer 102.

At this time, the microcomputer 102 performs automatic tuning tuning voltage and synchronization signal input from the image intermediate frequency processing unit 101 and the deflection circuit 103 through the determination of the presence or absence of a broadcast signal as shown in FIG. The presence or absence of an input is searched (step ST103).

This will be described in detail with reference to FIG. 3 as follows.

First, the microcomputer 102 searches for the presence or absence of a synchronization signal input from the deflection circuit 103 to the identification terminal ID (step ST1).

As a result of the search in the step ST 1, when the low signal comes in as the identification terminal ID as shown in (b) of FIG. As shown in (a), the tuner 100 is tuned at high speed by increasing the tuning voltage set for each band, i.e., in step ST12, and searching for the presence of a synchronization signal inputted to the identification terminal ID again. Done.

When the identification terminal ID transitions to a high value as a result of the search in step ST1, that is, when a synchronization signal is input, the automatic tuning station input to the automatic tuning tuning terminal AFT from the image intermediate frequency processor 101 is performed. It is searched whether the tuning voltage V _AFT is 4.2V or more (step ST2).

As a result of the search in step ST2, as shown in (c) of FIG. 4 input from the image intermediate frequency processing unit 101, when the automatic tuning tuning voltage V _AFT is 4.2V or less, the signal is recognized as no signal and the step ST12 is performed. ) it is again carried out and at least a fast search through the automatic channel selection search is again tuning voltage (V _AFT) (step; ST3).

As a result of the search in the step ST3, if the automatic tuning tuning voltage V _AFT is 4.2V or more, as shown in (c) of FIG. 4, the search speed is adjusted through the B state mode as shown in (a) of FIG. 100 is tuned to an intermediate state (step ST4), and the search is repeated until the automatic tuning tuning voltage V _AFT is 4.2V or less.

At this time, the data value VS1 of the automatic tuning tune voltage V _AFT is stored in the memory unit (step ST5).

When the automatic tuning tune voltage V _AFT is 4.2V or less as a result of the search in the above step ST3, the automatic tuning tune voltage V _AFT is 0.7V or less as shown in (c) of FIG. 4. (Step ST6).

If the automatic tuning tune voltage V _AFT is 0.7 V or more, the search speed is tuned slowly through the C state mode as shown in FIG. 4A (step S7). The search will be repeated until

At this time, the automatic tuning tune voltage V _AFT stores the data value VS2 in the memory section (step ST8).

When the automatic tuning tune voltage V _AFT becomes 0.7 V or less as a result of the search in step ST6, whether the difference between the data values VS1 and VS2 stored in the memory unit is within 0.125 MHz to 1.125 MHz. A search is made (step ST9).

As a result of the search, if the difference between the data values VS1 and VS2 does not exist within 0.125MHz to 1.125MHz, the fast search is performed again through the step ST12, and if present, the automatic tuning tuning voltage V _AFT currently input. The search is made as to whether the value is 2.3V or more (step ST10).

As a result of the search in step ST10, if the automatic tuning tuning voltage V _AFT is 2.3V or less, the tuner 100 is slow-tuned through the C-state mode as described above until it becomes 2.3V or more (step; ST11). ).

If the automatic tuning tune voltage V _AFT is 2.3V or more as a result of the search in step ST10, the program is stored in the memory unit (step ST13) and the other broadcasting station program PR is increased in the same manner as described above. State transition is made (step ST14).

Then, if all broadcasting station programs have been searched for or not (step ST15), if not completed, that is, if PR = 1, the tuner 100 is up to repeat the subsequent process including the step ST1 and then program number. If all programs of the broadcasting station have been searched for, the channel number corresponding to the program number is increased by one step as shown in FIG. 2 and stored in the memory unit (steps ST105 and ST106).

Thereafter, if the channel number is equal to the first backed up channel number (step ST106), if it is not the same, the process after step ST101 of FIG. 2 is repeated, and if it is the same, the search is completed.

However, such an automatic search apparatus of a conventional TV receiver automatically searches for and stores both a broadcast channel with a good signal state and a broadcast channel with a bad signal state while automatically searching and storing the broadcast channel with a bad signal state. (Difficult viewing or poor image quality) There was an uncomfortable problem of manually skipping or deleting the broadcast channel.

Accordingly, an object of the present invention is to automatically determine a broadcast channel having a good broadcast signal when automatically searching for a broadcast channel, and to store or delete a broadcast channel having a bad signal state by using a conversation method with a user. To provide a search method.

The object of the present invention is a method for achieving the step of searching for the presence of a broadcast signal input of a specific channel obtained by automatically tuning the tuner by backing up the initial tuning voltage when there is an automatic channel key input; If a broadcast signal exists in the specific channel, searching for a signal state of the particular channel to determine whether to skip allocation or storage, increasing the channel and applying it to all broadcast channels, and broadcasting the specific channel after completion of searching for the broadcast channel. This is achieved by displaying a program number and a skip assignment on a screen and storing the skip or channel number according to a user's selection. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

5 is a configuration diagram of an automatic search apparatus of a TV receiver according to the present invention, and a tuner 200 that tunes to a corresponding channel frequency according to an input tuning voltage as shown therein; Processes the video and audio intermediate frequency of the corresponding channel input and tuned from the tuner 200 to output the auto tuning tuning voltage V _AFT and to adjust the auto gain control voltage V _AGT according to the strength of the broadcast signal. An output image intermediate frequency processor 201; A deflection circuit 203 for detecting and outputting a synchronization signal from the broadcast signal input from the image intermediate frequency processor 201; The broadcasting channel is stored or broadcast depending on the automatic tuning tuning voltage V _AFT and the automatic gain control voltage V _AGT level from the image intermediate frequency processor 201 and the synchronization signal input from the deflection circuit 203. The skip state of the channel is displayed to the user through the screen, and if the skip key is input through the key operation unit 204, the micom 202 is configured to skip the corresponding channel number.

When described in detail with reference to Figures 5 to 8 the effect of the present invention configured as described above.

When the user turns on the power through the remote controller or the key control unit 204 to automatically memorize the channel and inputs the auto channel storage key (step ST200), the microcomputer 202 is the current channel number, that is, the current center frequency. The corresponding tuning voltage is backed up (step ST201) and input to the tuner 200 (step ST202).

The tuner 200 tunes the broadcast signal received from the antenna to the corresponding channel according to the tuning voltage input from the microcomputer 202 and inputs it to the image intermediate frequency processor 201.

The image intermediate frequency processing unit 201 processes and outputs the image and audio intermediate frequencies of the corresponding channel which are tuned from the tuner 200, and output the automatic tuning tune voltage V _AFT and the automatic gain control voltage V _AGC . Is detected and input to the automatic tuning tuning terminal (AFT) and the automatic gain control terminal (AGC) of the microcomputer 202, and the broadcast signal is input to the deflection circuit 203.

The deflection circuit 203 detects a synchronization signal from the broadcast signal processed by the image intermediate frequency processor 201 and inputs it to the identification terminal ID of the microcomputer 202.

At this time, the step (ST203) of confirming the broadcast signal input of FIG. 6 by the microcomputer 202 will be described with reference to the detailed flowchart of FIG. 7. First, it is determined whether the ID for determining whether the synchronization signal is input is high ( In step ST21, if the ID is high, it is determined that a synchronization signal is being input, and then the automatic tuning tuning voltage V _AFT is determined to control according to each automatic tuning tuning voltage tuning channel V _AFT . The operation is performed. (Step: ST22 to ST31)

When the determination is completed, the automatic gain control voltage V _GC is determined to determine whether the signal is a strong signal or a weak signal, stored in a memory when the strong signal is stored, and a skip assignment is performed when the weak signal is performed. ; ST295, ST206, ST35, ST36)

That is, in FIG. 7, the microcomputer 202 first searches for the presence or absence of a synchronization signal input to the identification terminal ID from the deflection circuit 203 (step ST21).

As a result of the search in step ST21, when the low signal is input to the identification terminal ID, that is, if there is no synchronization signal, the signal is recognized as no signal, and the search speed set for each band is set through the A state mode, that is, for each band. The tuner 200 is quickly tuned (step ST32) to search for the presence of a synchronization signal input to the identification terminal ID.

When the identification terminal ID transitions to high as a result of the search in step ST21, that is, when the synchronization signal is input, the automatic input of the automatic tuning tune voltage V _AFT from the image intermediate frequency processing unit 201 is performed. It is searched whether the tuning tune voltage V _AFT is 4.2V or more (step ST22).

If the automatic tuning tuning voltage V _AFT input from the image intermediate frequency processing unit 201 is 4.2V or less as a result of the search in step ST22, it performs a fast search again through the step ST32. If it is abnormal, the automatic tuning tune voltage V _AFT is searched again (step ST23).

If the automatic tuning tune voltage V _AFT is 4.2V or more, the search speed is tuned to the tuner 200 at an intermediate speed through the B state mode (step ST24). The search is repeated until V _AFT ) is less than 4.2V.

At this time, the data value VS1 of the above-mentioned automatic tuning tune voltage V _AFT is stored in the memory unit (step ST25).

When the automatic tuning tune voltage V _AFT is 4.2V or less as a result of the search in step ST23, it is searched whether the automatic tuning tune voltage V _AFT is 0.7V or less (step ST26).

If the automatic tuning tuning voltage V _AFT is 0.7V or more, the search speed is tuned to the tuner 200 at a low speed through the C state mode (step ST27), and the automatic tuning tuning voltage V _AFT is 0.7V. The search is repeated until

At this time, the data value VS2 of the automatic tuning tune voltage V _AFT is stored in the memory unit (step ST28).

In the following case, it is searched whether a difference between the data values VS1 and VS2 stored in the memory unit exists within 0.125 MJHz to 1.125 MHz (step ST29).

As a result of the search, if the difference between the data values VS1 and VS2 does not exist within 0.125 MHz to 1.125 MHz, the fast search is performed again through the step ST32, and if present, the automatic tuning tuning voltage V _AFT currently input. The search is made at 2.3V or higher (step ST30).

As a result of the search in step ST30, if the automatic tuning tuning voltage V _AFT is 2.3V or less, the tuner 200 is slow-tuned through the C-state mode as described above until it becomes 2.3V or more (step; ST31). ).

If the automatic tuning tune voltage V _AFT is 2.3 V or more, the search result is searched to the UHF channel (step ST33).

If the search is not completed to the UHF channel as a result of the search in step ST33, the currently tuned automatic tuning tuning voltage is stored (step ST204).

That is, whether the channel number shown in FIG. 6 is stored in the memory unit and the automatic gain control voltage V _AGC input from the current image intermediate frequency processing unit 201 is 5.5V or less, that is, the strength of the broadcast signal is strong. A search is made (step ST205).

If the automatic gain control voltage V _AGC corresponding to the channel is 5.5 V or less, the channel is stored in the memory unit (step ST35). The tuner 200 is tuned by increasing in the same manner (step ST36) (step ST37).

That is, by increasing the channel data by one step, the tuner 200 is tuned to the corresponding channel (ST207) and program state transition is performed.

If the automatic gain control voltage V _AGC corresponding to the current channel is 5.5 V or more, the channel is stored in the memory unit to which the skip is allocated, as shown in FIG. 8 (step ST206). The process returns to the above steps ST36 and ST37 for searching.

On the other hand, if the search is completed to the UHF channel as a result of the above search (step ST208), as shown in FIG. 8, the program number is increased (step ST38).

Thereafter, the program number PR is searched for 1 (step ST39). If the program number PR is 1, a search for one broadcasting station channel is completed. Otherwise, the program number PR is searched for whether or not the program number is assigned to a skip (step ST210).

If the search result is a channel that is not allocated to the skip, the program number is increased by one as described above (step ST211). If the channel is allocated to the skip, the memory allocated to the channel allocated to the skip is on-screen. The display is displayed on the screen to the user using the display (step ST212).

If a skip key is input from the user, the user skips the channel and increases the program number PR again.

When the storage key is input in step ST212, the channel is stored in the memory unit and the channel search is completed.

As described in detail above, according to the present invention, when the broadcast channel is automatically searched, only the broadcast signal having a good state of the broadcast signal is judged and stored, and the presence or absence of the broadcast channel having a bad signal state is stored or skipped by a conversation method with the user. As in the technique of the present invention, there is no need to skip or delete unnecessary broadcast channels manually.

Claims (3)

Retrieving the broadcast signal input of a specific channel obtained by automatically tuning the tuner by backing up the initial tuning voltage when the automatic channel storage key input is present; Searching for a signal state of the particular channel and determining whether to allocate or store the signal when the broadcast signal exists in the specific channel, and increase the channel to apply it to all broadcast channels; And after the completion of searching for the broadcast channel, displaying a broadcast program number and a skip assignment of a specific channel on a screen and skipping or storing the channel according to a user's selection. The method of claim 1, wherein the channel skip allocation or storage determination process comprises: searching for the strength of a broadcast signal corresponding to the channel by comparison with a set voltage when the broadcast signal exists; Storing the channel number and increasing the channel number if the strength of the broadcast signal is lower than the set voltage to perform the search; And if the strength of the broadcast signal is higher than the set voltage, allocating skips to store the corresponding channel, increasing the channel number, and performing a search. 2. The method of claim 1, wherein the skipping or storing of the channel comprises: reading a specific channel number among the stored channel numbers after searching for a broadcast channel and searching for whether a skip is allocated to the channel; Displaying on the screen a screen indicating whether to skip the memory if the skip is allocated to the specific channel; and skipping or memory if a specific key is selected by the user after the display. How to auto detect.