KR19990051259A - How to automatically select a broadcast channel for a video cassette recorder - Google Patents

Abstract

The present invention relates to a method for allowing the tuner 11 to automatically search for a broadcast channel in a video cassette recorder. The channel up / down key of the key matrix 20 is driven, and the microcomputer 12 determines the broadcast channel. The receiving channel of the tuner 11 is increased / decreased until information indicating that the tuner 11 receives the broadcast channel as the receiving channel from the unit 15 is input. In addition, the microcomputer 12 controls the OSD unit 18 until the tuner 11 receives the broadcast channel so that a predetermined blueback screen is formed.

Accordingly, the present invention can easily search for a broadcast channel by using a channel up / down key, and in the process of searching for a broadcast channel, a predetermined blueback screen can be processed to easily recognize that the user is searching for a broadcast channel. There is an effect.

Description

How to automatically select a broadcast channel for a video cassette recorder

The present invention relates to a video cassette recorder, and more particularly, to a method for automatically searching for and tuning a broadcast channel of a broadcasting station.

A general video cassette recorder has a built-in tuner and has a function of receiving and recording a television broadcast signal.

A television broadcast is a broadcast signal (video and audio signal) produced by a broadcast station for general public, and these broadcast signals are modulated and transmitted to a channel or frequency band assigned to each broadcast station.

Thus, users of a typical video cassette recorder must tune the tuner's receive channel to one of the broadcast channels in order for the tuner to receive the broadcast signal. That is, viewers can select and receive one of the broadcast channels by controlling the tuner of the television and adjusting its reception frequency band. Here, since the transmission channels are assigned to the broadcasting stations as described above, broadcast signals are not transmitted to all channels that the television can receive. Therefore, if a user of the video cassette recorder changes its reception channel, there may be a case where a broadcast signal is received (this channel may be a channel that is allowed to broadcast) while a broadcast signal is not received. have.

On the other hand, the conventional video cassette recorder employs two methods for selecting a channel of a tuner. One is to use the numeric keys to directly select the desired channel, and the other is to configure the channel up / down key, and when the channel up key is pressed, the tuner sequentially increases the receiving channel from the receiving channel. If the channel down key is pressed, the tuner sequentially descends the receiving channel from the receiving channel.

In this method, in order for a user to search for a broadcast channel in which a broadcast signal exists, a user must operate a numeric key or a channel up / down key, which causes inconvenience.

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and an object of the present invention is to provide a method for automatically selecting a broadcast channel of a video cassette recorder in which a user of a video cassette recorder can easily search for a broadcast channel.

According to an aspect of the present invention, there is provided a channel up / down key for controlling a receive channel of a tuner, the method comprising: determining whether a channel up key is driven; If the channel up key is driven, increasing the tuner's receive channel until the tuner receives a predetermined broadcast channel; Determining whether the channel down key has been driven; If the channel down key is driven, reducing the tuner's receive channel until the tuner receives a predetermined broadcast channel.

1 is a block diagram of a video cassette recorder performing a method for automatically selecting a broadcast channel according to the present invention;

2 is a flowchart illustrating a method for automatically selecting a broadcast channel of a video cassette recorder according to the present invention.

<Description of the symbols for the main parts of the drawings>

11: tuner 12: micom

13 sync synchronization unit 14 recording processing system

15: broadcast channel determination unit 16: deck

17: playback processing system 18: OSD unit

19: Modulator 20: Key Matrix

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

1 is a block diagram of a video cassette recorder for performing an inter-channel interference prevention method according to the present invention, including a tuner 11, the tuner 11 of the channel corresponding to the tuning signal of the microcomputer 12; It is configured to receive a signal and apply it to the synchronization separating unit 13 and the recording processing system 14.

The sync separator 13 detects a sync signal, that is, a horizontal and vertical sync signal, from the signal of the tuner 11 and applies it to the broadcast channel determiner 15. The broadcast channel determiner 14 determines whether the current channel is a broadcast channel using the sync signal of the sync separator 13. The broadcast channel determination unit 15 integrates the synchronization signal separated by the synchronization separation unit 13 by using an integration circuit and a comparison unit, and then this integration value is a predetermined reference value (when the broadcast channel is in a normal electric field state). The synchronization signal is set to the voltage at the time of integrating the signal. It will be apparent to those skilled in the art that the present invention can be adopted. The broadcast channel determination unit 14 is configured to apply the broadcast channel signal to the microcomputer 12 when it is determined that the broadcast signal corresponds to the broadcast channel.

On the other hand, the recording processing system 14 is configured to record the received broadcast signal of the tuner 11 and apply it to the deck 16 in accordance with the recording control signal of the microcomputer 12, and the deck 16 is the microcomputer 12 It is configured to drive in the drive mode according to the control of). That is, the deck 16 drives in the recording mode when the recording control signal is applied from the microcomputer 12 to record the broadcast signal of the recording processing system 14 on the magnetic tape, and when the reproduction control signal is applied from the microcomputer 12 It is configured to drive in the reproduction mode to read out the broadcast signal recorded on the magnetic tape and apply it to the reproduction processing system 17.

In addition, the deck 16 of the present invention can be driven in various modes such as a fast play mode and a pause mode according to the drive control signal from the microcomputer 2, but the drive mode of the deck and the drive thereof. The mechanism is a technical matter that can be easily understood by those skilled in the art of the present invention, the detailed description thereof is omitted.

The signal processed and output by the reproduction processing system 17 and the received image signal of the tuner 11 are applied to the OSD unit 18, and the OSD unit 18 corresponds to a predetermined OSD control signal of the microcomputer 12. And a text signal or a blue back signal are mixed with the video signal of the tuner 11 and the reproduction processing system 17 and output.

On the other hand, the OSD unit 18 is connected to the modulator 19, the modulator 19 receives the output signal of the OSD unit 18 or the tuner 11 under the control of the microcomputer 12, the predetermined channel (3 or 4). Channel) or output the input video signal in its original state without being modulated.

Meanwhile, as shown, the key matrix 20 is connected to the microcomputer 12, and the function key of the key matrix 20 (channel selection key (consisting of numeric keys), channel up / down key, power on / off key) , A playback key, a modulator modulation channel selection key, and the like), and the microcomputer 12 performs the operation described below in accordance with the driving of these keys.

2 shows a flowchart of the present invention performed by the microcomputer 12.

As shown, the microcomputer 12 determines whether the channel up key of the key matrix 20 is pressed in step S1, and proceeds to step S2 when the channel up key is pressed.

In step S2, the microcomputer 12 applies a tune control signal to the tuner 1 that increases the channel by one from the channel on which the tuner 11 is currently receiving. Therefore, the tuner 11 will increase the reception channel by 1 to receive the signal of the corresponding channel. The channel on which the tuner 11 is receiving may or may not be a broadcast channel. In this case, when the channel being received by the tuner 11 is a broadcast channel and viewing is possible, the broadcast channel determination unit 15 applies a broadcast channel signal to the microcomputer 12, but the channel on which the tuner 11 is receiving. The broadcast channel determination unit 15 does not apply the broadcast channel signal to the microcomputer 12 even when the broadcast channel is not the broadcast channel or the broadcast channel is in the weak electric field state.

The microcomputer 12 determines whether the broadcast channel signal is applied within the predetermined time from the broadcast channel determining unit 15 (S3, S4). When the broadcast channel signal is applied, the microcomputer 12 fixes the reception channel of the tuner 11, but broadcasts the broadcast channel signal. If the channel signal is not applied, the OSD control unit 18 outputs an OSD control signal for causing the OSD unit 18 to output a predetermined blue back screen signal (S5), and returns to step S2 until the broadcast channel signal is applied. That is, a process of increasing the reception channel by one until the reception channel of the tuner 11 reaches a predetermined broadcast channel is performed.

As a result of the determination in step S1, when the channel up key is not pressed, the microcomputer 12 proceeds to step S6, and determines whether the channel down key is pressed in step S6.

As a result of the determination in step S6, when the channel down key is pressed, the microcomputer 12 applies the tuning control signal to the tuner 11 to decrease the channel by one from the channel on which the tuner 11 is currently receiving (S7). . Therefore, the tuner 11 will receive a signal of the corresponding channel by decreasing the receiving channel by one.

The microcomputer 12 determines whether the broadcast channel signal is applied within a predetermined time from the broadcast channel determining unit 15 (S8, S9). When the broadcast channel signal is applied, the microcomputer 12 fixes the reception channel of the tuner 11, but broadcasts the broadcast channel signal. If the channel signal is not applied, the OSD control unit 18 outputs an OSD control signal for causing the OSD unit 18 to output a predetermined blue back screen signal (S10), and returns to step S7 until the broadcast channel signal is applied. That is, a process of increasing the reception channel by one until the reception channel of the tuner 11 reaches a predetermined broadcast channel is performed.

That is, in the present invention, when the channel up / down key is pressed as described above, the channel of the tuner is automatically up / down until the broadcast channel is reached, and a predetermined blue back screen is displayed while the channel of the tuner is up / down. This makes it easy for the user to know that the broadcast channel is being searched for.

As can be seen from the above description, in the present invention, a broadcast channel can be easily searched using a channel up / down key, and a user can search for a broadcast channel by processing a predetermined blueback screen in the search process of the broadcast channel. There is an effect that you can easily know that it is.

Claims (2)

A channel up / down key for controlling the reception channel of the tuner 11 is formed, and as a driving method of a video cassette recorder, Determining whether the channel up key is driven; If the channel up key is driven, increasing the receive channel of the tuner (11) until the tuner (11) receives a predetermined broadcast channel; Determining whether the channel down key is driven; When the channel down key is driven, reducing the reception channel of the tuner (11) until the tuner (11) receives a predetermined broadcast channel. 2. The method according to claim 1, further comprising increasing and decreasing the receive channel of the tuner (11) to a broadcast channel and outputting a predetermined blueback signal.