KR930008468B1 - Tunning control method - Google Patents

Abstract

The method is about the tuning control of receiving signal in TV. The frequency synthesizer (FS) and the voltage synthesizer (VS) tuning method are used selectively, so that the method is more useful in which various channel are used. The method comprises the six steps of: the 1st step determines the tuning method from the keying data; the 2nd step, at the FS type, performs auto searching and memorizes the channel with the receiving signal; the 3rd step, at the VS type, memorizes a PLL data in the memory sect. (25); the 4th step determines the selection; the 5th step adds the PLL data to the PLL part (216); and the 6th step reads the memorized PLL data and applies than to the PLL sect. of the tuner.

Description

Tuning Control Method

1 is a block diagram of a conventional voltage synthesis (VS) tuning system.

2 is a block diagram of a conventional frequency synthesis (FS) tuning system.

3 is a block diagram of the received signal tuning system of the present invention.

4 is a signal flow diagram showing a received signal tuning control method of the present invention.

5 is a signal flow diagram showing a tuning data storage process of the present invention.

* Explanation of symbols for main parts of the drawings

21: tuner 21a: tuning unit

21b: PLL section 22: key input section

23: microcomputer 24: intermediate frequency processing unit

25: Memory SW ₁ : FS / VS Type Selector Switch

The present invention relates to a method of tuning a received signal of a TV, and in particular, using only the advantages of a frequency synthesis (FS) tuning method and a voltage synthesis tuning (Voltage Synthesizer: VS) tuning method. The present invention relates to a tuning control method in which the TV frequency is suitable for use in various places.

In general, in the VS tuning method, the tuning voltage and the band switching voltage according to each channel button are converted into a digital signal and stored in a memory in advance, and when the channel is selected by the channel button, the digital signal corresponding to the channel button is read. The channel is tuned by converting the analog signal into a tuning voltage and a band switching voltage and applying it to the electronic tuner.

However, in this VS tuning method, there is a problem in that regional compatibility is good, but channel data alone cannot be used to tune directly.

In addition, the FS tuning method is a method of directly tuning the local oscillation frequency of a tuner. Since the PLL data value of the center frequency of each channel is predetermined for each country, tuning is possible only by channel data.

FIG. 1 is a block diagram of a conventional voltage synthesizing (VS) tuning system. As shown in FIG. 1, when a channel selection signal is input to the microcomputer 13 through the key input unit 12, the microcom 13 selects the channel. The signal is recognized as a program number, and the band data stored in its internal memory is read and applied to the band driver 15. Accordingly, the band driver 15 uses the VHF high band terminal (V _H ) and VHF of the tuner 11. One of the low band terminal (V _L ) and the UHF band terminal (UH) is selected, and at this time, the tuning voltage data pulse-modulated (PWM) is read from the microcomputer 13 and applied to the digital / analog converter 16. Accordingly, the tuning voltage data is converted into the tuning voltage of the analog signal by the digital / analog converter 16 and applied to the tuning terminal V _T of the tuner 11 to tune the corresponding channel. ) Output signal is intermediate frequency Is input to the unit 14 is to be processed. The microcomputer 13 includes a ROM for storing tuning voltage data, a central processing unit for performing arithmetic processing, and an input / output interface for inputting / outputting data.

However, in the conventional VS tuning system, the regional compatibility is good, but channel data alone cannot select the channel directly.

2 is a block diagram of a conventional frequency synthesis (FS) tuning system. As shown therein, when channel data is input to the microcomputer 3 through the key input unit 2, the microcomputer 3 displays the channel data. Phase locked loop (hereinafter referred to as PLL) value is calculated from and applied to the PLL section 1b of the tuner 1, and the PLL section 1b adjusts the input vane switching voltage. Outputs the band switching signal for selecting the VHF high band terminal (V _H ), VHF low band terminal (V _L ) and UHF band terminal (UH) of 1a), and feeds back the local oscillation frequency and the local oscillation frequency of the selected channel. By comparing the frequency of the tuning voltage, the tuning voltage is increased (UP) or decreased (Down) and output to the tuning terminal (V _T ) of the tuning section (1a). By fixing, the corresponding channel is tuned, and the output signal of this tuner 1 is transmitted to the intermediate frequency processing section 4. It is input and is processed. The microcomputer 3 is composed of a ROM for storing tuning data for each channel, a central processing unit for performing arithmetic processing, and an input / output interface for inputting / outputting data.

As a result, when the microcomputer 3 receives the channel data from the key input unit 2, the channel is tuned as the PLL value corresponding to the channel data is calculated and applied to the tuner 1.

However, in the conventional FS tuning system as described above, since the channel frequency is different for each country, the calculation method of the PLL data is changed, which complicates the program, and there are problems that many countries cannot use due to the limitation of ROM size.

In order to solve such a conventional problem, the present invention performs tuning using the FS tuning method in an area tuned by the FS tuning method, and uses the FS tuner in an area not tuned by the FS tuning method. Created a tuning control method capable of performing a type tuning, described in detail with reference to the accompanying drawings as follows.

3 is a block diagram of a TV received signal tuning system according to the present invention, and as shown therein, a key input unit 22 for inputting channel tuning key data, and an FS / VS for selecting an FS tuning method and a VS tuning method. A type selection switch SW ₁ , a memory unit 25 storing VS channel tuning PLL data, and channel selection key data of the key input unit 22 are received, and the FS / VS type selection switch ( A microcomputer that calculates and outputs a PLL value from the channel tuning key data according to the selection state of SW ₁ ) as tuning data or reads and outputs channel tuning PLL data according to the channel tuning key data from the memory unit 25. 23), a tuner 21 for tuning channels according to the tuning PLL data output from the microcomputer 23, and an intermediate frequency processing section 24 for receiving and processing the output signal of the tuner 21, The tuner 21 is a microcomputer 23 Emitter PLL unit (21b) and, VHF high-band terminals (V _H), VHF low bad terminal by the band switching signal of the PLL unit (21b) channel tuning receiving the PLL data, and outputting a band switching signal and a tuning voltage ( V _L ) and one of the UHF band terminals UH are selected, and the tuning unit 21a selects the channel by the tuning voltage. The microcomputer 23 stores the tuning data for each channel of the FS system. It consists of a ROM, a central processing unit that performs arithmetic processing, and an input / output interface that inputs / outputs data.

The operational effects of the present invention configured as described above will be described in detail with reference to the flowcharts of FIGS. 4 and 5.

When the channel selection key data is outputted from the key input unit 22 and input to the microcomputer 23, the microcomputer 23 receives the FS according to the selection state of the FS / VS type selection switch SW ₁ as shown in the flowchart of FIG. Determines whether a type is a VS type.

For example, when the FS / VS type selection switch SW ₁ is switched to the resistor R ₁ side and the high potential of the power supply terminal Vcc is applied, the FS / VS type selection switch SW _{1 is determined.} ) Is switched to ground, and a low potential signal is applied.

When the microcomputer 23 determines the FS type as described above, the PLL data of the corresponding channel according to the channel selection key data input from the key input unit 22 is calculated by the channel-specific tuning data stored in the internal ROM. As the tuning PLL data calculated in this way is applied to the PLL section 21b of the tuner 21, the band of the tuning section 21a corresponding to the PLL data is selected, and the tuning PLL data is selected by the tuning voltage of the PLL section 21b. The channel is tuned, and the output signal of this tuner 21 is applied to the intermediate frequency processor 24 for processing.

On the other hand, when the microcomputer 23 determines the VS type, the channel selection key data input from the key input unit 22 is recognized as a program number, and the address of the memory unit 25 is designated by the program number. By reading the channel tuning PLL data already stored at the address and applying the tuning PLL data to the PLL portion 21b of the tuner 21, the channel corresponding to the tuning PLL data is tuned as described above. The output signal of 21 is applied to the intermediate frequency processing section 24 and processed.

The process of storing the tuning PLL data in the memory section 25 will be described with reference to the flowchart of FIG.

When the automatic channel memory key data is output from the key input section 22 and input to the microcomputer 23, the microcomputer 23 determines whether the microcomputer 23 is the FS type or the VS type according to the selection state of the FS / VS type selection switch SW ₁ . Judge. At this time, if it is determined that it is a VS type, the minimum tuning PLL data value "0" Hex, that is, "0" is output to the tuner 21, and the memory unit (B) is used to rearrange the contents of the memory unit 25 in the VS type. Reset all data in 25). Thereafter, the tuner 21 determines whether there is a reception signal in the channel tuned by the tuner 21, and if there is a reception signal, the current tuning PLL data is stored in the initial start address of the memory unit 25, and the memory unit ( Increment the memory address of " 25 " by " 1 ". After that, if there is no signal as a result of the determination, it is determined whether the currently output tuning PLL data is the maximum value, and if it is not the maximum value, the current tuning PLL data is increased by one step and outputted to the tuner 21 after the above. The process returns to the step of judging whether there is a received signal and repeats the subsequent process. In this way, the channels of one band are automatically searched for, and the tuning PLL data of the channels with signals are stored in the memory unit 25.

As described above, the change from the minimum value to the maximum value of the tuning PLL data is performed by changing the PLL data value (14 bits) from "0" HEX to "3FFF" HEX for each band data. And the PLL data, that is, the tuning PLL data, are stored in the memory unit 25.

Therefore, when the channel is selected through the key input section 22, the microcomputer 23 reads the serial tuning PLL data stored in the memory section 25 as described above and applies the same to the PLL section 21b of the tuner 21. Tuning is performed according to the tuning PLL data, and the corresponding channel is tuned, and the output signal of the tuner 21 is processed by the intermediate frequency processing unit 24.

On the other hand, if the automatic channel memory key data is output from the key input section 22 and input to the microcomputer 23, and the FS type, the automatic channel memory is implemented in the same manner as the conventional method. That is, as described above, in the internal ROM of the microcomputer 23, tuning data for each channel of the FS method is stored. By performing an auto-search, only the channel for receiving the actual broadcast signal is stored. It finds the channel where the actual broadcast signal is received in the tuning data of the channel stored in the ROM and memorizes the channel so that the channel can be immediately raised / lowered from the current signal channel when the channel is UP / Down. Will be.

As described in detail above, the present invention can perform tuning by the Fs tuning method and operate the tuning PLL data of the FS as the pulse width modulation data for the tuning voltage of the FS in other regions not tuned by the FS tuning method. In this way, the tuning can be performed by the VS tuning method.

Claims (1)

The first step of judging whether the FS type or the VS type is determined according to the selection state of the FS / VS type selection switch SW ₁ when the automatic channel memory key data is output from the key input unit 22 and input to the microcomputer 23. In the first step, if the FS type is determined, the second step of auto-searching the channel-specific tuning data of the internal ROM and sequentially storing the channel having the received signal; The tuning PLL data of each band is outputted to the PLL section 21b of the tuner 21 in increments of one step from the minimum value to the maximum value, and the tuning PLL data of the channel with the received signal is transmitted to the initial address of the memory section 25. A third step of sequentially designating and storing the data, and then, when the channel selection key data is outputted from the key input unit 22 and input to the microcomputer 23, the selected state of the FS / VS type selection switch SW ₁ is selected. According to FS type A fourth step of determining whether it is a VS type or a FS type in the fourth step, and calculates the tuning PLL data of the corresponding channel according to the channel selection key data to the PLL unit 21b of the tuner 21. In the fifth step of applying and if the VS type is determined in the fourth step, the address of the memory unit 25 is stored by the channel selection key data, and the channel tuning PLL data stored therein is read and the tuning PLL data is read. And a sixth step of applying it to the PLL section (21b) of said tuner (21).