KR19980038097A - Broadcast Channel Search Method of Video Receiver - Google Patents

Abstract

When the power of the video receiver receiving the television broadcast signal is turned on, the search function is automatically performed to search and store the channel with the television broadcast signal. Judge whether it is stored, and if it is stored, receive the TV broadcast signal of the selected channel before turning off the power. If the channel with the TV broadcast signal is not stored, the search function is performed to By receiving the signals one by one and checking and storing the channel with the received television broadcast signal, the user can search for the channel with the television broadcast signal without operating the key for selecting the search function. Even users who do not have a television signal You can select the channel.

Description

Broadcast Channel Search Method of Video Receiver

The present invention relates to a broadcast channel search method of a video receiver for automatically searching and storing a channel capable of receiving a television broadcast signal in a video receiver and a video cassette tape recorder for receiving a television broadcast signal. will be.

In general, television broadcasts are classified into a plurality of channels having a predetermined bandwidth.

For example, the National Television System Committee (NTSC) -M scheme, adopted in many countries around the world, including Korea, the United States, and Japan, has a very high frequency (VHF) frequency band of 6488 MHz and 174216 MHz, and an ultra high frequency (UHF) of 470890 MHz. The frequency bands are allocated to the bandwidths of 6 MHz, respectively, and are set from channel 2 to channel 83, and the broadcasting station broadcasts a television broadcast signal in the frequency band of the set channel.

The video receiver which receives the television broadcast signal influences the television broadcast signal of the channel currently received by the television broadcast signal of the adjacent channel when the electric field strength of the television broadcast signal of the channel adjacent to the channel receiving the current television broadcast signal is strong. Will be given.

Therefore, when allocating a channel of a television broadcast, the television broadcast signal is not broadcast to an adjacent channel so that the currently received television broadcast signal is not affected by the signal of the adjacent channel.

In other words, when a television broadcast signal is transmitted through a specific channel, a channel is allocated so that the television broadcast signal is not transmitted to one channel higher than the specific channel and one channel lower.

When two adjacent broadcast stations transmit a television broadcast signal through the same channel, interference between the two transmitted television broadcast signals occurs and cannot be received.

Therefore, when two broadcasting stations are adjacent to each other, even the same television broadcast signal is broadcasted on different channels, which causes channels for receiving television broadcast signals to be different in each region.

When the user of the video receiver selects each of these television broadcast channels one by one to check whether there is a television broadcast signal, it causes a lot of inconvenience and inconvenience to the user.

Therefore, the video receiver includes a search function, and when a user selects a search function, the video receiver automatically searches for and stores a channel with a television broadcast signal, and when a channel up and down key is pressed, a channel in the range of the stored channel is pressed. Is raised and lowered to receive a television broadcast signal.

However, users without knowledge of the search function cannot automatically search and store a channel with a television broadcast signal using the search function, and select a channel one by one to receive the television broadcast signal.

In addition, a user with knowledge of the search function had to press the search key one by one when selecting the search function.

Accordingly, an object of the present invention is to provide a broadcast channel search method of a video receiver which searches and stores a channel having a television broadcast signal by automatically performing a search function when the video receiver is powered on.

In the broadcast channel search method of the video receiver of the present invention for achieving the above object, it is determined whether a channel with a television broadcast signal is stored when the power of the video receiver is turned on, and the power is turned off if it is stored. Receive television broadcast signals of previously selected channels.

When the channel with the television broadcast signal is not stored, the search function is performed to receive the signals of all channels one by one, and the channel with the received television broadcast signal is identified and stored.

Therefore, according to the present invention, a user can search for a channel with a television broadcast signal without operating a key for selecting a search function.

1 is a circuit diagram showing the configuration of a video receiver to which the broadcast channel search method of the present invention is applied.

2 is a signal flow diagram illustrating a broadcast channel search method of the present invention.

Explanation of symbols for main parts of the drawings

1: microcomputer

2: operation command input unit

3: memory

4: antenna

5: Tuner part

6: intermediate frequency amplifier

7: image signal processing unit

8: Sync signal detector

Hereinafter, a broadcast channel search method of a video receiver of the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram showing the configuration of a video receiver to which the broadcast channel search method of the present invention is applied. As shown therein, the microcomputer 1 controls the search and storage operation of the channel with the television broadcast signal and performs an operation command according to the user's operation, and the operation according to the user's operation on the microcomputer 1. An operation command input unit (2) for inputting a command, a memory (3) for storing and outputting a channel searched by the microcomputer (1), and the microcomputer (1) among television broadcast signals input through an antenna (4); A tuner section 5 for receiving a television broadcast signal of a channel according to the control of the < RTI ID = 0.0 > The image signal processor 7 detects and outputs an image signal from the output signal of the frequency amplifier 6, and detects a synchronous signal from the output signal of the image signal processor 7 to detect the synchronization signal. The synchronization signal detection unit 8 inputted in 1) is configured.

In the broadcast channel search method of the video receiver of the present invention applied to the video receiver having such a configuration, as shown in FIG. 2, the microcomputer 1 performs the step of turning on the power-on key from the operation command input unit 2 in step S1. Determine whether a signal is input.

That is, the operation command input unit 2 inputs the key signal of the image receiver and the signal of the remote control receiver, and determines whether the signal of the power-on key is input by the user operating the key of the image receiver or the remote control transmitter. do.

When the signal of the power-on key is input in step S1, the microcomputer 1 turns on the power of the image receiver in step S2 to operate normally, and the memory 3 in step S3. The stored data is searched to determine whether a channel containing a television broadcast signal is stored.

Here, the memory 3 is a nonvolatile memory such as EPROM (Erasable and Programmable Read Only Memory).

If the channel with the television broadcast signal is stored in the memory 3 in step S3, the channel selected by the user is selected immediately before the video receiver is turned off in step S4, and the tuner unit 5 ) To receive a television broadcast signal of the selected channel.

If there is no channel stored in the memory 3 in step S3, the microcomputer 1 controls the tuner unit 2 in step S5 to receive the television broadcast signal of the first channel, It is checked whether or not there is a synchronization signal in the television broadcast signal received in S6).

That is, the tuner unit 2 receives a television broadcast signal of a channel under the control of the microcomputer 2 and outputs an intermediate frequency signal, and the outputted intermediate frequency signal is amplified by the intermediate frequency amplifier 6. The video signal processor 7 detects and outputs a video signal.

In the video signal output from the video signal processing section 7, there is a synchronization signal when a television broadcast signal is received, and there is no synchronization signal when the television broadcast signal is not received. The synchronization signal detector 8 detects the synchronization signal and inputs the same to the microcomputer 1.

The microcomputer 1 checks the presence or absence of a synchronous signal as an output signal of the synchronous signal detector 8 in step S6, determines that there is a television broadcast signal when there is a synchronous signal, and in step S7. After storing the channel for receiving the current television broadcast signal in the memory 3, it is determined whether the channel is the last channel in step S8.

If there is no synchronization signal in step S6, it is determined whether the channel is the last channel in step S8.

If it is not the last channel in the step S8, the microcomputer 1 increases the one channel to the current channel to receive the television broadcast signal, and repeats the operation from the step S6 if there is a synchronization signal. In operation S8, the operation of storing the channel in the memory 3 is repeatedly performed.

In this state, when the operation for searching for the presence or absence of a television broadcast signal to the last channel is completed, the microcomputer 1 checks the first channel stored in the memory 3 in step S10, and confirms the first channel. Causes the tuner unit 5 to receive the television broadcast signal.

As described in detail above, the present invention automatically searches for and stores a channel having a television broadcast signal, so that the user does not need to operate the search function one by one. Channel can be selected.

Claims (3)

The first step of determining whether a channel containing a television broadcast signal is stored when the video receiver is turned on, and the television broadcast while selecting signals of all channels one by one when the channel is not stored in the first step. A second process of determining whether a signal is received, a third process of storing a channel from which a television broadcast signal is received in the second process, and when the search of all channels is completed in the second process and the third process And a fourth process of receiving a television broadcast signal of one channel from among the channels stored in the third process. The method according to claim 1, wherein the second step detects the presence of a television broadcast signal by detecting a synchronization signal mixed with the video signal of the television broadcast signal. The method of claim 1, wherein the fourth process comprises receiving a stored television broadcast signal of a first channel.