KR19990036100U - Automatic Channel Tuning Device for Portable Television - Google Patents

Abstract

The present invention relates to an automatic channel tuning apparatus for a portable television, and more particularly, to an apparatus for automatically tuning a broadcast channel when a reception area of the portable television is changed. According to the present invention, a portable TV has a tuner that detects when a reception area is changed by a user and a broadcast signal received from an antenna is not detected by the sync signal detector. A tuning control signal is applied to the unit to receive a broadcast signal of another local channel from which a synchronization signal is detected. On the other hand, when the local information data output from the navigation system is applied to the microcomputer after the navigation system is mounted, the microcomputer compares the local channel information data previously stored in the memory unit, and the compared local channel information data. Is identical with the local information data, the frequency of the local channel stored in the memory unit is read and the tuning control signal is applied to the tuner unit so that the broadcast signal of the local channel matching the data is received, thereby changing the reception area. Even if this occurs, there is proposed an automatic channel tuning apparatus for portable television, in which automatic tuning of a broadcasting channel is performed without manual operation.

Description

Automatic Channel Tuning Device for Portable Television

The present invention relates to an automatic channel tuning apparatus for a portable television, and more particularly, to an apparatus for automatically tuning a broadcast channel when a reception area of the portable television is changed.

In general, a television receives a radio wave transmitted from a transmitting side, demodulates a color composite video signal into a luminance signal and a chromaticity signal, and displays the same on a CRT. That is, the frequency of the desired channel in the tuner is selected, the same intermediate frequency is always made in the intermediate frequency amplifier of the next stage, and when the image detection is performed, the color composite video signal is output. The color composite image signal is separated into a luminance signal and a chroma signal through a comb filter, and the luminance signal is amplified by a delay circuit by a time delay when demodulating the chroma signal and applied to the cathode of the CRT. The RY and BY signals, which are chromaticity signals, control RGB electron beams of the CRT to reproduce a wide range of colors in each pixel unit.

In the portable TV having the same function as described above, it is frequently used when traveling on vacation or in a vehicle such as a car due to its convenience. It is the same as a television that is difficult to carry.

However, due to the convenience of the portable, the movement between the regions is easy, but if the broadcast channel received in a certain area is moved to another area is not received because the operation to find the broadcast channel to receive the broadcast signal manually There is a problem.

Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to provide an automatic channel tuning apparatus for automatic channel tuning, regardless of a change in reception area, in a portable television that is mobile. To provide.

The technical idea of the invention for achieving the object of the present invention is to output the local information data of the region to which the local information output means is moved, the control means for receiving the local information data from the local information output means to the storage means When it matches with the local channel information data stored in the storage means compared with the previously stored local channel information data, it is assumed that the broadcast signal of the matching local channel is received by applying a tuning control signal to the tuning means.

1 is a block diagram showing an automatic channel tuning apparatus for a portable television according to a first embodiment of the present invention.

2 is a block diagram showing an automatic channel tuning apparatus for a portable television according to a second embodiment of the present invention;

Explanation of symbols for main parts of the drawings

10, 100: antenna 15a, 151: high frequency amplifier

15b, 152: mixing section 15c, 153: local oscillating section

20, 200: IF amplifier 25, 250: voice detector

30, 300: sound processor 35, 350: voice amplifier

40, 400: Speaker 45, 450: Image detector

50, 500: Main image processing IC 55, 550: CRT driver

60, 600: CRT 65: Sync signal detector

70: first microcomputer 650: navigation system

700: second microcomputer 750: memory unit

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment for achieving the object of the present invention.

1 is a block diagram showing an automatic channel tuning apparatus for a portable television according to a first embodiment of the present invention.

Referring to FIG. 1, the present invention provides a high frequency amplification unit 15a for amplifying a high frequency signal, which is a complex video signal received from an antenna 10 included in a portable television system, and amplified from the high frequency amplification unit 15a. A tuner comprising a mixing section 15b for receiving a local oscillation frequency from an input signal and a local oscillating section 15c and converting it to an intermediate frequency, and a local oscillating section 15c for supplying a signal for frequency conversion to the mixing section 15b. Part 15,

IF amplifier 20 for intermediate frequency amplification of the composite video signal applied from the tuner unit 15 and voice detection for extracting an audio signal from the composite video signal applied with intermediate frequency amplification from the IF amplifier 20. And a sound processor 30 for processing and outputting a voice signal output from the voice detector 25, and amplifying the voice signal output from the sound processor 30 to the speaker 40. The voice amplifier 35 to make it,

An image detector 45 extracting an image signal from the complex image signal amplified by the intermediate frequency from the IF amplifier 20, and a main image which processes and outputs an image signal applied from the image detector 45; A processing unit (50), and a CRT driver (55) for converting the image signal output from the main image processing unit (50) to be displayed on the CRT (60);

A synchronization signal detection unit 65 connected between the tuner unit 15 and the IF amplifier unit 20 to detect a synchronization signal among the composite video signals output from the tuner unit 15, and the synchronization signal detection unit 65; ) Is composed of a microcomputer 70 for applying a tuning control signal to the tuner unit 15 according to whether or not the detection is performed.

Hereinafter, the operation according to an embodiment of the present invention made as described above will be described in detail.

First, when the portable television is moved from a certain region to another region by the user, a high frequency signal, which is a broadcast signal received from the antenna 10 provided in the portable television, is input circuit (not shown) of the tuner unit 15. A characteristic impedance of the supply line (FEEDER) and the input impedance of the high frequency amplification unit 15a are matched and output to the high frequency amplification unit 15a through a), and the high frequency amplification unit 15a increases the gain of the received high frequency signal. Make your selections good and avoid image disturbances.

In addition, the signal amplified by the high frequency amplifier 15a and the frequency output from the local oscillator 15c are input to the mixer 15b, and the mixer 15b mixes the high frequency signal and the local oscillation frequency. Therefore, an intermediate frequency signal corresponding to the difference between two frequencies is generated.

Here, when the synchronization signal mixed in the intermediate frequency signal generated from the tuner unit 15 is detected by the synchronization signal detector 65, the intermediate frequency signal output from the tuner unit 15 is an IF amplifier unit ( After the amplification process of 20), only the voice signal is detected by the voice detector 25 and applied to the sound processor 30, and the volume of the voice signal (VOLUME) and the equalizer are transmitted through the sound processor 30. EQUALISER, BALANCE, and the like are adjusted and output to the speaker 40 through the voice amplifier 35.

In addition, the intermediate frequency signal, which is a broadcast signal amplified by the IF amplifier 20, is detected only by the image signal by the image detector 45, and then the color demodulation of the main image processing IC 50 and the like. The amplification process is output to the CRT 60 via the CRT driver 55.

On the other hand, if the synchronization signal is not detected by the synchronization signal detection unit 65, the detection signal indicating that the detected broadcast signal is a no signal without the synchronization signal is applied to the first microcomputer 70.

Accordingly, the first microcomputer 70 receives the detection signal of the synchronization signal detecting unit 65 to apply the tuning control signal to the tuner unit 15, and the tuner unit 15 receives the first microcomputer 70. The signal receiving operation of the non-signaled local broadcasting channel is stopped in response to the tuning control signal of the control panel, and the broadcast signal of the other local broadcasting channel emitted from the antenna 10 is received.

Hereinafter, unlike the first embodiment described above, in the case where the reception area of the portable television is changed according to the second embodiment in which the navigation system 650 is mounted, a process of automatically tuning a broadcast channel is shown. This will be described with reference to.

First, when the portable television is moved from a certain area to another area by the user as in the first embodiment, the navigation system 650 applies information data of the current location to the second microcomputer 700. The second microcomputer 700 compares the local channel information data that is preset and stored in the memory unit 750. When the compared local channel information data matches the local information data, the memory unit 750. The tuner 150 applies the tuning control signal to the tuner unit 150 by reading the frequency of the corresponding local channel stored in the tuner unit 150.

Accordingly, the tuner unit 150 selects a local channel of a corresponding frequency according to a tuning control signal applied from the second microcomputer 700 so that the broadcast signal is received, and the received broadcast signal is the first embodiment. After the audio signal and the video signal are separated as in the example, they are output to the speaker 400 and the CRT 600 through signal processing.

As described above, the present invention provides a case in which a portable TV has a changed reception area by a user, and on the other hand, when a broadcast signal received from an antenna is not detected by the sync signal detector, The sensing microcomputer applies a tuning control signal to the tuner to receive a broadcast signal of another local channel in which a synchronization signal is detected. On the other hand, when the local information data output from the navigation system is applied to the microcomputer after the navigation system is mounted, the microcomputer compares the local channel information data previously stored in the memory unit, and the compared local channel information data. Is identical with the local information data, the frequency of the local channel stored in the memory unit is read and the tuning control signal is applied to the tuner unit so that the broadcast signal of the local channel matching the data is received, thereby changing the reception area. Even if this occurs, there is an effect that automatic tuning of a broadcast channel is performed without manual operation.

Claims (2)

In a portable television that can tune into a local broadcasting channel regardless of fluctuations in the reception area, Sync signal detecting means for detecting a sync signal from the broadcast signal received by the television; and And control means for applying a tuning control signal to the tuning means to receive a broadcast signal from which the synchronization signal is detected when the synchronization signal is not detected by the synchronization signal detection means. Device. In a portable television that can tune into a local broadcasting channel regardless of fluctuations in the reception area, Local information output means for outputting the corresponding local information data according to the region, Storage means for storing information data of the channel transmitted in said region; and When the region information output means receives the region information data and compares it with the region channel information data stored in the storage means, applying the tuning control signal to the tuning means so that the broadcast signal of the matched region channel is received. An automatic channel tuning device for a portable television comprising control means.