KR920010384B1 - Method for controlling tuning and storing channel of digital tv - Google Patents

Abstract

The channels of VHD, UHF, and cable are stored in a same area and tuned selectively according to selected mode using the method. The method comprises a channel storage control routine for storing channel information on an EEPROM (24) according to channel number and current television modes when channel storage key is input and a tuning control routine for tuning channel according to channel up and down key input, current television mode and most significant bit of trim byte. The current mode of a television is stored on an EEPROM using extra bit of channel data byte except bits for storing channel number.

Description

Channel storage and tuning control method of digital TV

1 is a general system block diagram of a digital TV.

Figure 2a is a signal flow chart according to the channel storage control method of the present invention, (b) is a signal flow chart according to the tuning control method of the present invention.

3A and 3B are explanatory diagrams showing the configuration of a channel number and a fine adjustment byte used for storing channel information in the present invention.

* Explanation of symbols for the main parts of the drawings

20: Tuner 21: Tuner interface

22: analog / digital converter 23: digital signal processing unit

24: Y pyrom 25: microprocessor

26: digital / analog converter 27: input / output circuit

CRT: CRT

The present invention relates to a method of channel storage and tuning control of a digital TV in a digital TV capable of tuning wired TVs. The present invention relates to a channel storage and tuning control method of a digital TV that enables to selectively tune only a channel corresponding to each mode even if a channel of a mode is stored in the same region.

Conventional digital TVs are composed of VHF channels (2-13), UHF channels (14-83), and wired television receiver channels (1, 14-64, 95-99), but in general TV tuners, VHF12 channels and UHF channels Only the tuner can be tuned, and in the tuner, the switch can be switched between two modes, namely, the normal mode and the wired mode, but in the case of the wired mode, the VHF12 channel and the 57 channel dedicated channel can be tuned. Will be.

Therefore, the channel number (2-13), that is, the VHF12 channel has the same center frequency at the high frequency in the normal mode or the wired mode, so if the same number is displayed, the same screen is displayed in each mode, but the channel number is 14-64. In the case of the general active mode, the signal in the UHF band is tuned at high frequency. In the case of the wired active mode, the signal in the wired active band is tuned at high frequency.

Therefore, when the channel tuner uses the tuner for the digital TV, the channel to be tuned for each mode is different even if the same channel number is stored in the YPIROM. Therefore, the storage range for storing the channel of each mode is allocated to the YPIROM. Since it is set to not overlap with each other, this is because the range that can store channels in each mode is reduced, or because this pyrom needs to be added, there are defects such as not only hardware complexity but also a factor of manufacturing process point and cost increase. .

In view of the above-mentioned deficiencies, the present invention uses bits other than bits for channel information in the byte stored when the channel information is stored in the Y. pyrom, and the channel is a common channel, a UHF channel or a wired dedicated dedicated channel. After determining whether the information is stored and tuning the stored channel information, the present invention was made to tune a channel of a corresponding mode according to the TV mode. This will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a driving control apparatus for a digital TV to which the present invention is applied. As shown in FIG. 1, a tuner 20, a tuner interface 21, and the tuner 20 for tuning a signal received by an antenna ANT. An analog / digital converter 22, a digital signal processor 23, a digital / analog converter 26, and an analog-digital converter 22 for converting and processing an output signal of a digital signal, and a channel are stored. EEPROM) 24, an input / output circuit 27, and a microprocessor 25 for controlling the whole system, and the reference numeral CRT is a CRT.

If described in detail with reference to Figures 2 and 3 the effect of the present invention configured as follows.

If the key signal is input to the microprocessor 25 by pressing the channel storage key of the remote controller or key matrix while the power is turned on, the microprocessor 25 supplies the channel number of the input key signal to the accumulator A. And if the data stored in the accumulator A is the VHF mode channel data (2-13) and not the VHF mode channel data, as shown in FIG. 3A, the most significant bit (MSB) of the channel number storage byte. Is stored in the accumulator A and the current mode address is stored in the accumulator A to determine whether the current mode is the wired active mode. In the case of FIG. 3B, as shown in FIG. 3B, "0" is stored in the most significant bit (MSB) of the fine adjustment byte, and in the case of the wired active mode, "1" is stored in the most significant bit (MSB) of the fine adjustment byte. ”And save the VHF mode channel data in the accumulator (A) in the same address of EPIROM (24), and then return to the initial state and repeat the channel storage routine as above. do.

In this state, when the channel stored in the EPIROM 24 is to be tuned and the key signal is input to the microprocessor 25 by pressing the channel up / down key, the microprocessor 25 supplies the EPIROM 24. The total number of stored channels is stored in the counter (C), the channel byte and the fine adjustment byte of the corresponding address are read in the EPI (24), stored in the RAM of the microprocessor 25, and the channel number byte is stored in the accumulator (A). If the most significant bit (MSB) of the stored channel number buffer byte is " 0 ", and if it is not " 0 ", i.e., it detects that it is not a common channel, and stores the fine adjustment byte in the accumulator A, If the mode address is stored in the RAM of the microprocessor 25 and the value of the most significant bit (MSB) of the fine adjustment byte is determined to be equal to the mode bit, that is, the general bit mode and the wired bit mode bit, the mode bit is not the same. Subtracts 1 from the value counted in the counter C, determines whether the count value of the counter C is zero, and repeats the above operation until it becomes zero. If the channel is not memorized, the intermediate value is stored in the channel number (2) and the fine adjustment address in the channel number, and the value of the most significant bit (MSB) of the fine adjustment byte is not the same as the mode bit. In the same way as when the most significant bit (MSB) is zero, remove the data stored in the most significant bit (MSB) from the channel number byte and the fine adjustment byte, and store the data in the channel number address and fine adjustment address, and then tune the corresponding channel. It returns to the original state and repeats the channel numbers sequentially stored as above.

As described above, the present invention uses a bit other than bits for channel information in a byte storing channel information in EPI, so that the channel is a common channel (VHF: 2-13) and a UHF channel (14-83). After detecting and determining whether the wired dedicated dedicated channel (1,14-64,95-99) is detected and tuning the stored channel information, only the channel of the corresponding mode is tuned according to the current TV mode. It is possible to store 30 channels in regular mode as well as to store 30 channels in wired mode without using additional data, and invading the storage byte for data of deflection, sound quality and image quality in software. In addition, there is an effect that can store 30 channels of 15 channels per mode.

Claims (3)

When the channel storage key signal is input to the microprocessor 25, the channel storage control routine for discriminating the channel number and TV mode and storing the corresponding channel information at the address of the EPIROM 24 and the channel up / down key signal. Digital TV, which is controlled by a tuning control routine that tunes the corresponding channel according to the high-order bit value of the TV mode and the fine-tuning byte if it is a common channel or not a common channel according to the order of channel number according to the input. Channel storage and tuning control method. 2. The channel storage control routine of claim 1, wherein when the key signal is input to the microprocessor 25 by pressing the channel storage key, the microprocessor 25 enters the accumulator A into the channel number address of the input key signal. If the data stored in the accumulator (A) is VHF mode channel data (2-13), and if it is not VHF mode channel data, "1" is stored in the most significant bit (MSB) of the channel number storage byte. After saving the data stored in accumulator (A) to the channel number address, the current mode address is stored in the accumulator (A) to determine whether the current mode is the wired positive mode. If the most significant bit "0" is stored and if the wired positive mode, the VHF mode channel data is not stored in the accumulator A by storing "1" in the most significant bit of the fine adjustment byte. This same pirom 24 the address after a back channel stored in the digital TV which is characterized by carrying out a repetition reverted to the initial state and the tuning control method for the storage and. 2. The tuning control routine according to claim 1, wherein when the key signal is input to the microprocessor 25 by pressing the channel up / down key, the microprocessor 25 counts the total number of channels stored in the Y pyrom 24 by the counter (C). Read the channel byte and the fine adjustment byte of the corresponding address from EPIROM 24 and store it in the RAM of the microprocessor 25, and store the channel number byte in the accumulator A, and store the highest number of the stored channel number byte. If it is determined that the bit is "0" and not "0", the fine tuning byte is stored in the accumulator (A), and the current mode address is stored in the RAM of the microprocessor 25 and the most significant bit (MSB) of the fine tuning byte is stored. If it is not equal to the value of the mode bit, and subtracts 1 from the value counted in the counter C, the operation is repeated until the count value of the counter C becomes zero. , If it is equal to, the intermediate value is stored in the channel number (2) and the fine adjustment address in the channel number. If the value of the most significant bit of the fine adjustment byte is not the same as the mode bit, the most significant bit is zero. Similar to the case, the data stored in the most significant bit is removed from the channel number byte and the fine adjustment byte, respectively, and stored in the channel number address and the fine adjustment address, respectively, and then the channel is repeatedly stored. And tuning control method.

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