KR0146989B1 - Method for searching channel in a television - Google Patents

Abstract

The present invention relates to a channel tuning method in a television. To this end, a method for tuning a channel while automatically switching television broadcasting, cable broadcasting, and line input in a television is provided, wherein a key signal for channel up / down is inputted. Checking a current mode when a key signal for channel up / down is input by checking a; If the current mode is a television broadcasting mode and the input key signal is a key signal for channel up, the second step of channel selection while increasing the television broadcasting channel and switching to line input when the increased television broadcasting channel is out of the top channel is outputted. Wow; If the current mode is a TV broadcast mode and the input key signal is a key signal for channel down, the channel is tuned while reducing the TV broadcast channel. When the reduced TV broadcast channel is out of the lowest channel, it is switched to the highest channel of the cable broadcasting channel. Performing a third step; If the current mode is a cable broadcasting mode and the input key signal is a key signal for channel up, the channel is tuned while increasing the cable broadcasting channel, and when the increased cable broadcasting channel deviates from the highest channel, it is switched to the lowest channel of the TV broadcasting channel. A fourth step of doing; If the current mode is a cable broadcasting mode and the input key signal is a key signal for channel down, channel tuning is performed while reducing the cable broadcasting channel; Wow; A sixth step of switching to the lowest channel of the cable broadcasting channel if the current mode is the line input mode and the applied key signal is a key signal for channel up; If the current mode is a line input mode and the applied key signal is a key signal for channel down, providing a channel tuning method in a television comprising a seventh step of switching to the highest channel of the television broadcasting channel and outputting the channel up / down channel. It is possible to provide convenience for channel selection by automatically switching between a television broadcast channel, a cable broadcasting channel, and a line input signal stored only with a key.

Description

Channel Tuning Method on TV

1 is a schematic block diagram of a television according to the present invention;

2 is a flowchart illustrating a channel tuning process according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: key input unit 20: microcomputer

30: memory 40: tuner

50: switch unit 60: signal processing unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel tuning method in television, and more particularly, to a channel tuning method in television that allows channel tuning by sequentially changing voice broadcasting channels and line inputs including television channels during channel up / down. will be.

In general, the channel tuning function sequentially scans all channels, recognizes a channel into which a synchronization signal is input, and stores only a channel having a broadcast signal in a memory, thereby allowing a user to use a channel up / down key. This is a convenient function to change the channel while increasing / decreasing only the channels stored in the memory when selecting a channel.

On the other hand, in the conventional television, the channel is tuned by sequentially increasing or decreasing only the channel stored in the lowest channel to the highest channel based on the channel up / down keys in the television reception mode when the television channel is tuned. In order to tune the channel, the screen was switched to the OSD (On Screen Display) screen in the cable broadcasting reception mode, and then the voice broadcasting channel was tuned again using the channel up / down keys.

In addition, the line input also enters the OSD screen and can be viewed after switching the input to line input.

However, in recent years, the spread of cable broadcasting and the viewing of images by a large number of external inputs (LDP, VIDEO CD, etc.) have increased, and as a result, users have alternated a plurality of input sources such as television broadcasting, cable broadcasting, and external line input. In the case of watching, there is an inconvenient problem of selecting and watching a desired channel after switching a TV mode (television mode, cable broadcasting mode, line mode, etc.) to a desired mode.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to sequentially select not only a cable broadcasting but also a line input when a user selects a channel using a channel up / down key. To provide one channel tuning method.

A feature of the present invention for achieving the above object is a method of tuning a channel while automatically switching between television broadcasting, cable broadcasting, and line input in a television, by checking whether a key signal for channel up / down is input and Determining a current mode when a key signal for up / down is input; If the current mode is a television broadcasting mode and the input key signal is a key signal for channel up, the second step of channel selection while increasing the television broadcasting channel and switching to line input when the increased television broadcasting channel is out of the top channel is outputted. Wow; If the current mode is a TV broadcast mode and the input key signal is a key signal for channel down, the channel is tuned while reducing the TV broadcast channel. When the reduced TV broadcast channel is out of the lowest channel, it is switched to the highest channel of the cable broadcasting channel. Performing a third step; If the current mode is a cable broadcasting mode and the input key signal is a key signal for channel up, the channel is tuned while increasing the cable broadcasting channel, and when the increased cable broadcasting channel deviates from the highest channel, it is switched to the lowest channel of the TV broadcasting channel. A fourth step of doing; If the current mode is a cable broadcasting mode and the input key signal is a key signal for channel down, channel tuning is performed while reducing the cable broadcasting channel; Wow; A sixth step of switching to the lowest channel of the cable broadcasting channel if the current mode is the line input mode and the applied key signal is a key signal for channel up; If the current mode is a line input mode and the applied key signal is a key signal for channel down, the channel tuning method in the television comprising the seventh step of switching to the highest channel of the television broadcasting channel and outputting the same.

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

1 is a schematic block diagram of a television according to the present invention, which includes a key input unit 10, a microcomputer 20, a memory 30, a tuner 40, a switch unit 50, and a signal processing unit 60. do.

In the figure, the key input unit 10 is provided as an input means for controlling the operation of the television, and includes a plurality of keys including channel up / down keys and outputs a key signal corresponding to a user's key operation.

The microcomputer 20 scans the key signal from the key input unit 10 to control the operation of the television corresponding to the key signal. When the key signal for channel up / down is applied from the key input unit 10, the microcomputer 20 The television mode (TV broadcast mode, cable broadcasting mode) is checked, and channel information (PLL data corresponding to channel frequency) stored in the memory 30 and stored in the memory 30 is read out to perform a channel selection process.

That is, the microcomputer 20 selectively outputs a switching control signal for automatically switching the television broadcasting mode, the cable broadcasting mode, and the external line input mode, and a tuning signal (PLL data) for channel switching.

On the other hand, in the memory 30, channels which are being broadcasted are separately stored among the television broadcasting channel and the cable broadcasting channel based on the channel automatic tuning function, and the channel information stored under the control of the microcomputer 20 is read out. do.

The tuner 40 outputs a signal tuned to the corresponding channel by the tuning signal of the microcomputer 20 from the television broadcasting and wire broadcasting signals applied through the RF terminal.

In addition, the switch unit 50 selectively switches and outputs a signal from the tuner 40 and a signal from the line input terminal based on the switching signal from the microcomputer 20.

On the other hand, the signal processor 60 processes the video and audio signals from the switch unit 50 to enable display and audio output and applies them to the CRT and the speaker SP.

Next, a channel tuning process according to a preferred embodiment of the present invention in a television including the above-described configuration unit will be described in detail with reference to FIGS. 2 and 3.

2 is an operation of the present invention corresponding to the channel up key. First, the microcomputer 20 checks whether a key signal for channel up is applied (step 200).

At this time, if a key signal for channel up is applied, the current mode of the television is checked (step 202). If the current mode is a television mode, the channel currently tuned by tuner 40 is increased by one (step 204).

Next, it is determined whether the increased channel is smaller than the highest channel of the television channel (step 206), and if it is small, it is determined whether the channel is stored in the memory 30 (step 208).

At this time, if the channel is stored, the channel is broadcasted, so that the broadcast signal received through the increased channel can be viewed by applying the tuning signal corresponding to the tuner 40.

On the other hand, if the channel is not memorized in the step 208, that is, the channel is not broadcasted, the process returns to the step 204 to increase one more television channel.

Next, in step 206, if the channel increased by one is larger than the top channel of the television, the television mode is not switched to the lowest channel but is switched to the external line input mode (step 212).

That is, the microcomputer 20 applies a switching signal to the switch unit 50 to apply a signal from the line input terminal to the signal processing unit 60 so that the user can watch the line input.

On the other hand, if the current mode is a cable broadcasting mode in step 202, after increasing the channel tuned by the current tuner 40 (step 214), it is determined whether the increased channel is smaller than the highest channel of the cable broadcasting channel ( Step 216).

At this time, if the increased channel is larger than the highest channel of the cable broadcasting, the channel does not return to the lowest channel of the cable broadcasting but switches to the television broadcasting mode (step 222).

That is, the process proceeds to step 208 to check whether the minimum channel of the television broadcast is stored in the memory 30, and then performs the above-described television channel switching process.

On the other hand, in step 216, if it is smaller than the highest wired broadcast channel, it is checked whether the channel is stored in the memory 30 (step 218), and if it is stored, it is tuned to the increased current channel (step 220). If the cable broadcasting signal can be viewed, and conversely, if the cable broadcasting channel is not stored in the memory 30, the step 214 checks whether the next cable broadcasting channel is stored in the memory 30.

Meanwhile, if the current mode is the line mode in step 202, the switching signal is applied to the switch unit 50 so that the signal from the tuner 40 is applied to the signal processing unit 60, and then the lowest channel among the cable broadcasting channels. In step 218, it is checked whether or not the memory 30 is stored in the memory.

Therefore, when channel up key input, channel selection is sequentially performed in order of television broadcasting, external line input, and cable broadcasting while scanning to increase and select channels.

On the other hand, Figure 3 is an operation process of the present invention at the time of channel down key input, the operation process is similar to that of the channel up key input, so it will not be difficult to understand without a detailed description will be described briefly.

When the channel down key is input, as shown in the figure, the mode may be sequentially switched in the order of cable broadcasting, line input, and television broadcasting, and scanning may be performed to decrease and select a channel.

In other words, when the channel down key is input from the lowest channel of the cable broadcasting being performed in the current cable broadcasting mode, the input source is switched to the external line input terminal instead of switching to the highest channel of the cable broadcasting. When the channel down key is input, the channel is switched to the top channel of the television being broadcasted, and when the channel down key is applied to the lowest channel of the television, the channel down key is switched and outputted.

As described above, according to the present invention, instead of performing channel selection while switching the television mode (television broadcasting mode, cable broadcasting mode, and line mode) during channel selection, the television broadcasting channel and wired stored only by the channel up / down keys. It is possible to provide the convenience of channel tuning by automatically switching the broadcast channel and the line input signal sequentially.

Claims (1)

A method of tuning a channel while automatically switching between television broadcasting, cable broadcasting, and line input in a television, and checks whether a key signal for channel up / down is inputted and then inputs a key signal for channel up / down. Identifying a mode; If the current mode is a television broadcasting mode and the input key signal is a key signal for channel-up, channel selection while increasing the television broadcasting channel, and switching to the line input when the increased television broadcasting channel is out of the top channel is outputted. Wow; If the current mode is a TV broadcast mode and the input key signal is a key signal for channel down, the channel is tuned while reducing the TV broadcast channel. When the reduced TV broadcast channel is out of the lowest channel, it is switched to the highest channel of the cable broadcasting channel. Performing a third step; If the current mode is a cable broadcasting mode and the input key signal is a key signal for channel up, the channel is tuned while increasing the cable broadcasting channel, and when the increased cable broadcasting channel deviates from the highest channel, it is switched to the lowest channel of the TV broadcasting channel. A fourth step of doing; If the current mode is a cable broadcasting mode and the input key signal is a key signal for channel down, channel tuning is performed while reducing the cable broadcasting channel; Wow; A sixth step of switching to the lowest channel of the cable broadcasting channel if the current mode is the line input mode and the applied key signal is a key signal for channel up; And a seventh step of switching to the highest channel of the television broadcasting channel and outputting if the current mode is the line input mode and the applied key signal is the key signal for channel down.