KR0171992B1 - Method for automatically switching skip mode after storing last channel of a tv - Google Patents

Abstract

The present invention relates to an automatic channel setting method, which automatically switches from search mode to skip mode and detects all valid signals when an ID signal indicating that the set broadcast channel is the last valid channel is detected. The present invention relates to a method for automatically switching to a skip mode in the last channel memory of a television set in which an OSD character or figure indicating that a channel has been memorized and a skip mode has been executed appears on a CRT screen. The present invention comprises a synchronization signal detection unit (19) and an ID signal detection unit (30) for detecting an ID signal indicating the last channel, and the signal from the synchronization signal detection unit (19) in the channel search mode of automatic channel setting. It is determined whether the synchronization signal is included in the IF signal of the channel to be searched by and stored in the channel memory 10 in the case of an effective channel having the synchronization signal, and the tuner 100 is controlled up one step up. The ID signal detecting unit 30 determines whether there is an ID signal indicating that the broadcast channel is the last channel, and when there is an ID signal indicating that the broadcast channel is the last channel, the channel search mode automatically skips to the skip mode. It is characterized by switching.

Description

Automatic Switching to Skip Mode During Last Channel Memory of Television Receiver

1 is a block diagram schematically showing the internal structure of a general television receiver.

2 is a block diagram of an internal configuration of a television receiver having an automatic switching function to a skip mode according to an embodiment of the present invention.

3 is a flow chart for executing the automatic switching method to the skip mode in the last TV channel memory according to an embodiment of the present invention.

4 is an example of display instructing the viewer with OSD text that the automatic switching to the skip mode is performed in the last TV channel memory according to the method of the present invention.

* Explanation of symbols for main parts of the drawings

1 antenna 2 RF amplifier

3: mixer 4: IF amplifier

5: P / S separator 6: voice detector

7: Image detector 9: Key input unit

10: channel memory 11: microprocessor

12: OSD generator 13: PWN signal generator

14: integrating circuit 15: AFT circuit

16: adder 17: local oscillation circuit

18: AGC circuit 19: synchronization signal detection unit

21: voice processing unit 22: voice amplifier

23: image processing unit 24: mixer

25: CRT driver 30: ID signal detector

The present invention relates to an automatic channel setting method for upgrading a TV broadcasting channel by one step and to store a valid broadcasting channel. The present invention relates to an automatic channel setting method for detecting an identification signal indicating that the set broadcasting channel is the last valid channel. Switch from search mode to skip mode and simultaneously display on screen display (OSD) characters or figures on the CRT screen indicating that all valid channels have been memorized and that skip mode has been executed. The present invention relates to an automatic switching method to a skip mode in the last channel memory.

In general television receivers, the channel input is automatically searched (searched) from channel 2 to channel 69 by the automatic channel setting method when the key input unit presses the automatic setting key, and selects and stores only the effective channel having the synchronization signal. Is performed.

After the TV broadcast channel is set up, it is required to manually switch back to the skip mode. When the up and down keys of the key input unit are pressed, only the broadcast of the set effective channel is selected.

1 is a block diagram schematically showing a configuration of a general television receiver configured to perform such a function.

In the drawing, reference numeral 1 is an antenna, 2 is an RF amplifying unit for amplifying a radio frequency (RF) signal received through the antenna 1, 3 is an RF signal from the RF amplifying unit 2 and later It is a mixer that generates an IF signal by mixing the oscillation frequency from the local oscillation circuit 17 to be described.

In addition, reference numeral 4 is an IF amplifying unit for amplifying the IF signal output from the mixer 3, 5 is the image intermediate frequency signal (PIF) and the speech middle frequency signal in the IF signal output from the IF amplifying unit (4) A P / S separator for separating (SIF), 6 is an audio detector for detecting an audio signal from the SIF signal, and 7 is an image detector for detecting an image signal from the PIF signal.

Reference numeral 9 denotes a key input unit for inputting various commands such as selecting a desired channel by the viewer, 10 denotes a channel memory in which predetermined channel data is stored, and 11 denotes a device according to a remote control signal from the key input unit 9. It's the microprocessor that controls the whole.

Reference numeral 12 denotes an R (Red), G (Green), B (Blue) signal and OSD blanking signal (Y ') corresponding to the guidance characters and figures of the control state in accordance with the control signal from the microprocessor (11). Is an OSD generator for outputting the signal, and 19 is a synchronization signal detector for the IF signal output from the IF amplifier 4.

Reference numeral 13 denotes a PWN signal generator which generates a predetermined pulse width modulation signal in accordance with a control signal from the microprocessor 11, and 14 denotes a predetermined level signal by integrating the PWM signal. It is an integrated circuit to generate.

Reference numeral 16 is an adder for adding the voltage signal applied from the integrating circuit 14 and the voltage signal applied from the AFT (Auto Fine Tunning) circuit 15 to be described later, and 17 is a local oscillating circuit applied through the adder. The broadcasting station is executed by generating a predetermined frequency signal according to the level of the voltage signal to be output and outputting the mixer 3.

On the other hand, the AFT circuit 15 is an auto-analog circuit, which is provided for accurate tuning operation. In TV, the magnitude of the input signal received through the antenna 1 is changed due to the strength or fluctuation of the hand signal, and reference numeral 18 is based on the level of the video signal detected by the image detector 7. AGG (Auto Gain Control) circuit for controlling the output level of the image signal from the image detector 7 by controlling the medium amplitude of the above-described RF amplifier 2 and IF amplifier 4 to be.

Further, reference numeral 21 denotes a voice signal such as a base, treble, volume, etc. according to a control signal from the microprocessor 11 with respect to the voice signal output from the voice detector 6. It is a voice amplifier which amplifies and outputs to speaker.

Reference numeral 23 denotes a color, tint, brightness, etc. according to a control signal from the microprocessor 11 with respect to the image signal output from the image detector 7. To output R (Red), G (Green) and B (Blue) signals corresponding to the video signals, and 24 denotes R, G, B signals and OSD blanking signals output from the OSD generator 12. (Y ') and a mixer for mixing and outputting the R, G, and B signals output from the image processing unit 23, and 25 driving the CRT based on the R, G, and B signals output from the mixer 24. CRT driver.

Among the above components, the PWM signal generator 13, the integrator circuit 14, the AFT circuit 15, the adder 16, the local oscillator circuit 17, and the mixer 3 are controlled by the microprocessor 11. As a component of a tuner for executing broadcast tuning, in the following description, reference numeral 100 is given to the tuner.

A method of automatically setting and memorying a broadcast channel in a conventional television receiver configured as described above will be described in detail.

When the automatic channel setting key of the key input unit 9 is pressed, the microprocessor 11 first determines whether the synchronization signal is detected from the IF signal of the channel currently being searched by the signal from the synchronization signal detection unit 19.

When the synchronization signal detection unit 19 detects the synchronization signal from the IF signal output from the IF amplifier 4, the detection signal H is applied to the microprocessor 11, so that the microprocessor 11 generates the synchronization signal detection unit 19. On the basis of the detection signal from), it is determined whether to detect the synchronization signal.

If the synchronization signal is detected, the channel is an effective channel with a broadcast signal that can be watched, and thus the microprocessor 11 stores the data of the channel in the channel memory 10.

If no sync signal is detected in the searched channel, or if the sync signal is detected and data of the effective channel is stored, the channel is upgraded to the next channel and the above steps are repeated. Set all valid channels present.

When the channel setting is completed by the automatic setting method, the skip key of the key input unit 9 must be pressed to switch from the channel search mode to the skip mode by manual operation. Then, when the up and down keys of the key input section 9 are pressed, no signal channels are tuned, and only the broadcast of the set effective channel is tuned.

As described above, the conventional television receiver has a problem in that the effective channel is set by the automatic setting method and the memory is manually switched to the skip mode before watching the TV.

The skip mode is simply performed by pressing the skip key of the key input unit 9, but ordinary people, especially the elderly and children, often do not know such a skipping method, and even if it is known, it is annoying or is mistaken. There are a lot of cases when not running.

If the skip mode is not executed as described above, a channel of no signal is also tuned when the broadcast channel is turned up and down when watching, and thus, the channel tuning process takes much time and the channel tuning is inconvenient.

In addition, the conventional automatic channel setting method has a problem that it takes a lot of time to set the channel because the effective channel is set by searching all channels 2 to 69.

On the other hand, recently, each broadcasting station has decided to adopt a broadcasting method that carries various information in the broadcast signal in order to provide a higher quality broadcasting service to the viewers, and is making concrete preparations for it. For example, the types of programs broadcasted by broadcasting stations are divided into several types such as text (subtitle) broadcasting, sports, movies, dramas, and news, and an identification signal indicating the type of each program is loaded on the broadcasting signal. If the broadcast is a broadcast of the last valid channel, the ID signal indicating that the last valid channel may be loaded on the broadcast signal.

Such a broadcasting method is only recently tried to be implemented in Korea, but has been implemented in foreign countries for a long time.

According to the present invention, when an ID signal indicating that the last valid channel is loaded on the broadcast signal of the last valid channel is transmitted and transmitted, the channel search and setting is performed only up to the last valid channel using the ID signal during automatic channel setting. To execute skip mode immediately after setting all valid channels.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and in executing the automatic channel setting method, after setting the last valid channel, the channel is changed from the channel search mode (search mode) to the skip mode by the ID signal of the channel. It is an object of the present invention to provide a method for automatically switching to the skip mode in the last channel memory of a television receiver, which makes the operation convenient and shortens the channel setting time by eliminating the operation of automatically switching to execute the skip mode separately.

In order to achieve the above object, a method for automatically switching to a skip mode in the last channel memory of a television receiver according to the present invention includes a synchronization signal detection unit, a synchronization signal detection unit, and an ID signal detection unit for detecting an ID signal indicating the last channel. In the receiver, in the channel search mode of automatic channel setting, it is determined by the signal from the synchronization signal detection unit whether the synchronization signal is included in the IF signal of the channel to be searched and stored in the case of an effective channel having the synchronization signal. First step; A second step of controlling the tuner up one channel to search; A third step of determining whether there is an ID signal indicating that the broadcast signal is the last channel by a signal from the ID signal detection unit; And a fourth step of automatically switching from the channel search mode to the skip mode when there is an ID signal indicating that the broadcast channel is the last channel.

According to the method of automatically switching from the search mode to the skip mode in the last effective channel memory of the present invention, when there is an ID signal indicating that the broadcast signal is the last channel during automatic channel setting, the search mode is automatically controlled by the microprocessor. Since the channel is automatically switched to skip mode, the channel of no signal does not appear on the screen as in the conventional case, even if the viewer does not manually switch to the skip mode. The channel setup time will be greatly shortened because is executed.

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

2 is a block diagram of a television receiver equipped with means for executing an automatic switching method to a skip mode in the last effective channel memory of the present invention.

As shown, except for the means for carrying out the method of the present invention, the components are the same as in FIG. 1, and therefore, in the following description, the same reference numerals will be omitted for the same components as those in FIG.

Reference number 1 is an antenna. 2 is an RF amplifier, 3 is a mixer, 4 is an IF amplifier for amplifying an IF signal output from the mixer 3, 5 is a P / S separation unit, 6 is a voice detector, and 7 is an image detector.

Reference numeral 9 is a key input section, 10 is a channel memory, 11 is a microprocessor, 12 is a control signal from the microprocessor 11, and R, G, B signals and OSD corresponding to guide letters and figures in the control state. An OSD generator for outputting the blanking signal (Y '), 19 is a synchronization signal detector for detecting a synchronization signal from the IF signal output from the IF amplifier (4).

Reference numeral 13 is a PWM signal generator, 14 is an integrated circuit, 15 is an AFT circuit 16 is an adder, 17 is a local oscillator circuit, 18 is an AGC circuit, 21 is a voice processor, 22 is a voice amplifier, 23 is an image processor, 24 is a mixer, 25 is a CRT drive part.

The television receiver which performs the automatic switching function to the skip mode of the present invention detects the ID signal indicating the last channel in addition to the above general components and applies the signal indicating the detection fact to the microprocessor 11 ( 30) is further configured.

A method of automatically switching from the search mode to the skip mode in the last effective channel memory of the present invention in the above-described television receiver will be described with reference to the flowchart of FIG.

When the synchronization signal is included in the IF signal of the channel searched according to the signal from the synchronization signal detection unit 19 according to the conventional automatic channel setting method, the data of this effective channel is stored (step S1).

The viewer presses the automatic setting key of the key input section 9 to memorize the effective channel, and the microprocessor 11 controls the tuner 100 by the signal from the key input section 9 step by step through the channel. Up.

The IF amplifier 4 outputs the IF signal for each channel. At this time, the synchronization signal detection unit 19 checks whether the synchronization signal is included in the IF signal, and detects the detection signal when it is an effective channel including the synchronization signal. To the microprocessor 11.

The microprocessor 11 inputs and stores the channel into the channel memory 10 when a detection signal is input from the synchronization signal detection unit 19.

Next, the tuner 100 is controlled to step up the channel to be searched (step S2). The microprocessor 11 sends data and a clock signal of the channel one step higher than the channel searched in the first step to the tuner 100 to raise the channel to be searched one step up.

Then, the microprocessor 11 determines whether there is an ID signal indicating that the broadcast signal is the last channel by the signal from the ID signal detection unit 30 (step S3).

If the ID signal is included in the IF signal output from the IF amplifier 4, the ID signal detector 30 detects this and applies a signal H to inform the microprocessor 11 that the ID signal has been detected. .

Therefore, the microprocessor 11 determines whether there is an ID signal indicating that the broadcast channel is the last channel by the signal from the ID signal detector 30.

In this step, if there is no ID signal in the IF signal, the process returns to the above-described first step.

When the broadcast signal of the searched channel has an ID signal indicating that it is the last channel, it automatically switches from the channel search mode to the skip mode (step S4).

If there is an ID signal indicating that the broadcast signal is the last channel in the third step, the microprocessor 11 stops the search mode and automatically switches to the skip mode.

When the skip mode is executed, the channel of no signal does not appear on the screen when the channel is changed, and only the broadcast of the set effective channel appears on the screen.

In addition, if the broadcast signal of the searched channel has an ID signal indicating the last channel, the automatic switching to the skip mode as described above is executed, and the OSD generator 12 is controlled to automatically switch from the channel search mode to the skip mode. Outputs the R, G, and B signals and the OSD blanking signal (Y ') corresponding to the guide letter or figure explaining the fact to the mixer 24 for a predetermined time.

Therefore, the guide letter or figure of OSD that the channel setting is completed and the skip mode is executed appears on the screen.

4 is an example of display in OSD characters indicating that the channel setting is completed on the TV screen and the automatic switching from the search mode to the skip mode is executed. Therefore, the viewer knows that the skip mode is automatically executed by the guide letter and does not execute a separate skip mode.

According to the automatic switching method to the skip mode in the last channel memory of the television receiver as described above, since the viewer sets all the effective channels by the channel search (search) mode and then immediately switches to the skip mode and executes the channel as in the prior art. It is effective to solve the inconvenience of having to skip mode after setting.

In addition, according to the present invention, since the channel is searched only to channel 13, which is the last valid channel, the channel setting time is greatly reduced.

The present invention is not limited to the embodiments described above, it will be apparent to those skilled in the art that various changes can be made by those skilled in the art without departing from the spirit and scope of the invention, such modified embodiments are It should fall within the scope of the appended claims.

Claims (2)

A television receiver comprising a synchronization signal detection unit 19 and an ID signal detection unit 30 for detecting an ID signal indicating that it is the last channel, from the synchronization signal detection unit 19 in the channel search mode of automatic channel setting. A first step of determining whether the synchronization signal is included in the IF signal of the channel searched by the signal and storing it in the channel memory 10 when it is an effective channel having the synchronization signal; A second step of controlling the tuner 100 up one channel to search; A third step of determining whether there is an ID signal indicating that the broadcast channel is the last channel by a signal from the ID signal detector 30; And a fourth step of automatically switching from a channel search mode to a skip mode when the broadcast signal has an ID signal indicating that the channel is the last channel. The R, G, B signal and OSD blanking signal corresponding to an OSD character or figure for guiding the fact of switching to the skip mode by executing the fourth step and controlling the OSD generator 12 at the same time. Y ') to output the skip mode in the last channel memory of the television receiver.