KR19980041424A - Channel automatic search device of television receiver - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel automatic search apparatus for a television receiver configured to automatically perform channel search in a state in which a television receiver is turned off. A channel memory, a synchronization detecting means for detecting a synchronization signal from the broadcast signal tuned by the tuner, a power supply means for supplying operating power to the entire apparatus when the television receiver is turned off, and the tuner in an off state of the television receiver. And control means for storing the tuning control data in which the synchronization signal is detected by the synchronization detecting means in the channel memory.

Description

Channel automatic search device of television receiver

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a channel automatic search apparatus for a television receiver, and more particularly, to a channel automatic search apparatus for a television receiver configured to automatically perform channel search while the television receiver is turned off.

In general, a television receiver has a channel search function for searching for a broadcasting channel in a region where the television receiver is used according to a viewer's selection.

Fig. 1 is a block diagram showing the main components of a television receiver having a channel searching function.

In FIG. 1, reference numeral 1 denotes an antenna for receiving a radio frequency (RF) transmitted from a broadcasting station, 2 denotes an RF amplifier for amplifying an RF signal received through the antenna 1, and 3 denotes a predetermined signal. A local oscillation circuit for receiving a voltage signal and generating a frequency corresponding to the voltage level, 4 is a predetermined frequency by mixing the frequency signal applied from the RF amplifier (2) and the frequency signal applied from the local oscillator circuit (3) A mixer for outputting an intermediate frequency signal (IF signal), 5 is an IF amplifier part for amplifying the intermediate frequency signal output from the mixer 4, and 6 is a complex from an intermediate frequency signal output from the IF amplifier part 5; An image detector detects a video signal.

In the drawing, reference numeral 7 denotes a PWM generator that generates a predetermined pulse width modulated signal PWM based on the data DATA and the clock signal CLK applied from the controller 13 to be described later. Is an integrating circuit which integrates the PWM signal output from the PWM generating section 7 and outputs a level signal corresponding to the signal.

In the drawing, reference numeral 9 denotes a synchronization detector for detecting a synchronization signal from the composite video signal output from the image detector 6, and 10 denotes a plurality of operation keys and channel search functions for the viewer to operate the television receiver. Remote control device having a channel search key for execution, 11 is a receiving unit for converting the infrared signal applied from the remote control device 10 to the corresponding electric code signal, 12 is a channel for storing channel data for channel selection The memory 13 is a control unit which controls not only the whole apparatus but also the channel search function based on the detection signal from the synchronous detection unit 9.

Next, the operation of the device having the above configuration will be described.

When the television receiver is turned on and the viewer operates the channel search key of the remote controller 10 to select the channel search function, the control unit 13 controls the PWM generator 7 to control the PWM generator 7 from the PWM generator 7. By adjusting the duty ratio of the output PWM signal, the voltage level applied to the local oscillation circuit 3 through the integrating circuit 6 is sequentially increased.

In this way, when the voltage level output from the integrating circuit 8 is sequentially increased, the frequency signal generated from the local oscillation circuit 3 is sequentially increased, resulting in a tuner composed of the mixer 4 and the local oscillation circuit 3. By this, the sequential tuning operation is executed.

On the other hand, the control unit 13 determines whether the synchronization signal is detected by the synchronization detection unit 9 while performing the sequential tuning operation by controlling the PWM generation unit 7 as described above. When a predetermined channel broadcast is detected by a tuning operation performed by the mixer 4 and the local oscillation circuit 3, and a synchronous detection signal is applied from the synchronous detection unit 9, the control unit 13 sends a corresponding synchronous signal. The data DATA applied to the PWM generator 7 at the moment when is detected is stored as channel data in the channel memory.

Then, the channel search operation is performed sequentially over a predetermined frequency band range to perform broadcast channel search.

Subsequently, after the channel search operation is completed, the controller 13 controls the channel data obtained by the search operation, that is, the PWM, when the viewer operates the number key or the channel up / down key of the remote controller 10. By sequentially reading the control data for the generator 7 and controlling the PWM generator 7, the local oscillation frequency of the local oscillation circuit 3 is set corresponding to the channel broadcasting desired by the viewer.

That is, in the above-described conventional apparatus, when a viewer operates a channel search key provided in the remote controller 10, the television receiver executes its own broadcast channel search operation to search for all channel broadcasts currently available in the corresponding region. Therefore, the convenience of the viewer is improved.

By the way, the following problem arises in the above-mentioned television receiver.

That is, in the current broadcasting system, since the frequency signal of each channel broadcast is set differently according to the region, the company manufacturing the television receiver is required to reset the channel memory 12 when the television receiver is shipped. .

Therefore, when a television receiver is purchased in a general household, it is necessary to store the channel data suitable for the region in the channel memory 12 by executing the channel search function described earlier in the operation.

However, in the conventional television receiver, the channel search operation is performed by the manual operation of the viewer, so that the elderly or adults who lack the knowledge of the channel search function do not execute the channel search function. In this case, the channel selection is very inconvenient, as well as the problem of not watching some channel broadcasts.

In addition, in the conventional television receiver, the channel search function is executed while the television receiver is turned on, so that the above-described channel search operation takes a long time and the viewer can watch the television receiver during such a search operation. Because it is not, the viewer feels uncomfortable.

Accordingly, the present invention has been made in view of the above circumstances, and the channel automatic search apparatus of a television receiver enables the viewer to easily perform channel selection by automatically executing a channel search function while the television receiver is turned off. The purpose is to provide.

1 is a block diagram showing the main components of a typical television receiver.

2 is a block diagram showing an automatic channel search apparatus of a television receiver according to an embodiment of the present invention.

**** Brief description of the main parts of the drawing ****

1: antenna, 2: RF amplifier,

3: local oscillation circuit, 4: mixer,

5: IF amplifier, 6: image detector,

7: pulse width modulated signal generator, 8: integral circuit,

9: synchronization detector, 12: channel memory,

21: power plug, 22: main power supply,

23: flyback transformer, 24: relay,

25: relay drive unit, 26: control unit.

The channel automatic search apparatus for a television receiver according to the present invention for realizing the above object comprises a tuner for executing a broadcast station, a channel memory for storing channel data for pre-interpreting the tuner, and a broadcast signal tuned by the tuner. Synchronization detection means for detecting a synchronization signal from the power supply; power supply means for supplying operating power to the entire apparatus when the television receiver is turned off; and tuning control of the tuner in the off state of the television receiver; And control means for storing the tuning control data in which the synchronization signal is detected by the channel memory.

According to the present invention having the above-described configuration, the channel search function is automatically executed while the television receiver is turned off, so that the viewer can easily perform channel selection at all times.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram illustrating a channel automatic search apparatus of a television receiver according to an embodiment of the present invention. In FIG. 2, the same reference numerals are given to the same parts as in FIG. 1, and detailed description thereof will be omitted.

In Fig. 2, reference numeral 21 denotes a power plug, and 22 denotes a switching mode power that generates and outputs operating power required for each circuit portion of a television receiver based on an input power applied from the power plug 21. 23 is a flyback transformer (FBT) that generates a high voltage for operation of a cathode-ray tube (CRT) based on an operating voltage applied from the main power supply 22, and 24 is an FBT (23). The relay 25 is for relaying the operating power supplied to the circuit, and 25 is a relay driver for driving the relay 24 on / off in accordance with a predetermined control signal.

In the drawing, reference numeral 26 denotes the channel memory 12 in the state where the television receiver is turned off to check whether the channel data is registered in the channel memory 12, and in this case the channel data is not registered. This is a control unit that executes a search function.

Next, the operation of the device having the above configuration will be described.

In the above configuration, the main power supply unit 22 is operated while the television receiver is turned off to supply operating power to each circuit, while the control unit 26 controls each relay driving unit 25 to turn off the relay 24. ), The FBT 23 is set in an inoperative state. In other words, the circuit portion for executing the automatic channel search function is set to be operable even when the television receiver is turned off.

On the other hand, in the power off state, the control unit 26 reads the channel memory 12 to detect whether the channel data is registered in the channel memory 12. In this case, when channel data is not registered in the channel memory 12, the controller 26 executes the channel search function described in FIG. 1 to obtain channel data corresponding to a broadcast channel that can be viewed in the channel memory 12. Will be saved.

That is, the control unit 26 controls the PWM generator 7 to sequentially increase and control the voltage level applied to the local oscillation circuit 3. At this time, when the synchronous detection signal is input from the synchronous detection unit 9, the PWM at that time is A series of control operations for storing the control data for the generator 7 in the channel memory 12 is executed for a predetermined bandwidth range.

In addition, during the channel search operation, the operation power applied to the FBT 23 is cut off and the CRT is set to the non-driven state, thereby preventing the viewer from recognizing that the channel search operation is being executed.

Then, after the user turns on the television receiver and selects a channel by operating the remote controller 10, the controller 26 controls the PWM generator 7 based on the channel data stored in the channel memory 12. ), The viewer tunes to the desired broadcast channel.

In other words, in the above embodiment, the television receiver automatically executes the channel search function in the off state.

Therefore, the viewer can perform channel selection without a separate operation for channel search, thereby greatly improving the convenience of the viewer.

In addition, in the above embodiment, since the channel automatic search function is executed with the CRT off, power consumption generated in the channel search process can be minimized.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical scope of the present invention.

That is, for example, in the above embodiment, the control unit 26 searches the channel memory 12 to determine whether the channel data is registered, and executes the channel search function only when the channel data is not registered. However, it is also preferable to configure this to execute an unconditional channel search operation.

As described above, according to the present invention, it is possible to realize the channel automatic search apparatus of the television receiver which enables the viewer to always perform channel selection easily by automatically executing the channel search function when the television receiver is turned off.

Claims (3)

A tuner for executing broadcast tuning, A channel memory for storing channel data for internationalizing the tuner; Synchronous detecting means for detecting a synchronous signal from the broadcast signal tuned by the tuner, power supply means for supplying operating power to the entire apparatus when the television receiver is turned off; And control means for tuning and controlling the tuner in the off state of the television receiver, and storing tuning control data in which the synchronization signal is detected by the synchronization detection means in the channel memory. Automatic Search Device. 2. The apparatus according to claim 1, further comprising switch means for intermitting the output power of the power supply means to be applied to the FBT, wherein the control means controls off of the switching means upon execution of a channel search operation. A channel automatic search apparatus for a television receiver. 2. The apparatus of claim 1, wherein the channel searching operation is executed when channel data is not stored in the channel memory.