KR19980078734A - Channel tuning method of television broadcasting signal - Google Patents

Abstract

The present invention relates to a channel tuning method according to a channel up / down key of a user when tuning a wireless television broadcasting channel and a cable television broadcasting channel. In particular, a channel not overlapping with a wireless broadcasting channel is selected in a cable broadcasting channel. And a second step of determining whether there is a channel selection request of a user, and if it is determined in the second step that a channel tuning request is present, a frequency range corresponding to a channel allocated to wireless broadcasting. A third step of increasing and decreasing a fourth step; and determining whether the frequency range corresponding to a channel allocated to wireless broadcasting is increased or decreased out of a range of a minimum channel and a maximum channel through the third step, and the fourth step. Is out of the range of the minimum and maximum channels among the channels allocated to the radio broadcast according to the user's request to increase or decrease the channel selection. If there is provided a channel tuning method for a television broadcast signal, comprising the fifth step of increasing or decreasing the frequency range corresponding to the channel allocated to the cable broadcasting set in the first step. In case of going to the mode or vice versa, it is necessary to spend a considerable amount of time to find the desired channel. Since TC channels are mixed among CATV channels, it is possible to solve the problem of continuous tuning for duplicate channels.

Description

Channel tuning method of television broadcasting signal

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly, to a channel tuning method according to a channel up / down key of a user during tuning of a wireless television broadcasting channel and tuning of a cable television broadcasting channel.

In general, modern people have a strong tendency to be specialized and specialized, and in order to satisfy this, they are privatized in addition to monolithic conventional radio television broadcasts and deal only with certain broadcast programs (eg, etc., music, news, movies, ...). Cable television (hereinafter referred to as CATV) broadcasting was started.

A general television broadcast receiver configured to receive such a broadcast program and provide the same to a user is illustrated in FIG. 1.

1 is a simplified block diagram of a general television broadcast receiver, in which reference numeral 1 denotes an antenna, and 2 denotes an RF amplification for amplifying a radio frequency (hereinafter referred to as RF) signal received through the antenna 1. 3 denotes an intermediate frequency (hereinafter referred to as IF) by mixing the radio frequency signal output from the RF amplifier 2 and the oscillation frequency signal output from the local oscillation circuit 17 to be described later. The first mixer outputs a signal.

Further, reference numeral 4 denotes an IF amplifier section for amplifying the intermediate frequency signal output from the first mixer 3, and 5 denotes an image intermediate frequency signal PIF in the intermediate frequency signal output from the IF amplifier section 4. And a P / S separator for separating the voice intermediate frequency signal SIF, and 6 represents a voice detector for detecting a voice signal from the voice intermediate frequency signal SIF output from the P / S separator 5. 7 denotes an image detector for detecting an image signal from an image intermediate frequency signal PIF output from the P / S separator 5.

In addition, reference numeral 8 denotes a remote control device that allows a viewer to select a desired channel or to select each mode of the television, that is, a TV / AV mode, and 9 denotes an infrared signal from the remote control device 8. 10 shows a receiver for converting a conventional code signal, 10 denotes a channel memory in which predetermined channel data is stored, and 11 denotes a microprocessor which controls the entire system in accordance with an input signal from the remote controller device 8.

In addition, reference numeral 12 denotes a screen display for overlapping and outputting a character or a picture on a screen on which a broadcast signal is output separately from the broadcast signal according to the control signal of the microprocessor 11 (On Screen Display). (Hereinafter referred to as OSD), and 13 denotes a PWM generator which generates a predetermined pulse width modulation (PWM) signal according to a control signal from the microprocessor 11, and 14 denotes the above. An integration circuit for integrating the PWM signal output from the PWM generator 13 to generate a predetermined level signal is shown.

In this case, when the viewer selects a predetermined channel using the remote controller device 8, the microprocessor 11 reads out channel data corresponding to the channel selected by the viewer from the channel memory 10 and then based on the selected channel. By controlling the PWM generator 13 to generate a predetermined PWM signal, the PWM signal is output as a voltage control signal corresponding to the channel selected by the viewer through the integrator circuit 14.

In addition, reference numeral 15 is provided for a precise tuning operation, and represents an Auto Fine Tunning circuit (hereinafter referred to as AFT) circuit 15, and 16 represents a voltage signal applied from the integrating circuit 14; An adder for adding a voltage signal applied from the AFT circuit 15 is shown, and 17 represents a local oscillating circuit for outputting a predetermined oscillation frequency.

In addition, reference numeral 18 controls the amplification degree of the above-described RF amplifier 102 and the IF amplifier 4 on the basis of the level of the image signal detected by the image detector 7, the image detector ( Figure 7 shows the Automatic Gain Control (AGC) circuit that controls the video signal output level from 7).

On the other hand, reference numeral 19 denotes an external AV device such as a VCR or a laser disc player, and 20 denotes the voice detector 6 and the image detector 7 according to the switching signal from the microprocessor 11 described above. A first switching section for selectively outputting audio and video signals from and external audio and video signals from the external AV device 19 is shown.

Although reference numeral 23 is not shown for the image signal output from the first switching unit 20, the color, tint, and brightness are in accordance with the control signal from the microprocessor 11. A video processing unit which processes (Brightness) and the like and outputs R (Red), G (Green), and B (Blue) signals corresponding to the video signal.

The RGB signal output from the image processor 23 is output by mixing RGB and OSD blanking signals Y ′, which are output signals of the OSD generator 12 described above, in the second mixer indicated by reference numeral 24. Reference numeral 25 denotes a CRT driving unit for driving the CRT based on the RGB signal output from the mixer 24.

In addition, reference numeral 21 denotes a base, treble, and volume according to a control signal from the microprocessor 11 although not shown for the voice signal output from the first switching unit 20. A voice processing unit for executing voice processing such as a volume), and 22 denotes a voice amplifying unit for amplifying and outputting the voice signal processed by the voice processing unit 21 to a speaker.

In the general TV configured as described above, when the viewer selects the TV / AV mode by using the remote controller 8, the microprocessor 11 controls the switching unit 20 to control the voice detector 6. And by selectively outputting the video and audio signals from the video detector 7 or the video and audio signals from the external AV device 19 to the video processor 23 and the audio processor 21. Can watch the video and audio through the CRT and speakers of the TV.

In addition, the RF amplifier 2 is connected to a wired cable in addition to the antenna signal to receive and watch CATV broadcast through the above-described process.

Referring to the conventional broadcasting channel tuning method in the general broadcasting receiver configured as described above, when the user tunes into any TV channel through the remote control device 8, the microprocessor 11 inputs it through the receiver 9; In response to this, the frequency generated by the PWM generator 13 is controlled in correspondence with the frequency band of the channel (TV broadcasting 2 to 69 channels) to be tuned among the wireless television broadcasting channels.

In addition, when a user selects an arbitrary CATV channel through the remote control device 8, the microprocessor 11 receives it through the receiver 9 and accordingly transmits the frequency generated by the PWM generator 13 according to the cable TV broadcast. Control is performed in correspondence with the frequency band of the channel (CATV broadcasting channels 1 to 125) to be tuned among the channels.

Therefore, if the broadcast being watched by the user is in the TV mode, the channel selection changes according to the increase or decrease of the channel selection, and is changed from the second channel to the 69th channel. In addition, if the broadcast being watched by the user is in the CATV mode, the channel change due to the channel tuning is increased or decreased from the first channel to the 125th channel of the CATV broadcast.

Therefore, if the user selects CATV while watching TV or wants to watch TV while watching CATV, a considerable amount of time must be spent searching for a desired channel. There was a problem of continuous tuning.

An object of the present invention for solving the above problems, since comparing the broadcast channel according to the TV broadcast and CATV broadcast CATV broadcast channel is included in the general TV broadcast channel, the selection of the wireless television broadcast channel and cable TV broadcast The present invention provides a channel tuning method according to a user's channel up / down key for excluding a duplicate channel and a non-overlapping channel when selecting and selecting a channel.

1 is a block diagram illustrating a general television receiver.

2 is a flowchart of a channel tuning method of a television broadcast signal according to the present invention.

A feature of the present invention for achieving the above object is, the first step of selecting and setting a channel that does not overlap with the wireless broadcast channel in the area of the cable broadcasting channel, and determining whether the channel selection request of the user exists A third step of increasing / decreasing a frequency range corresponding to a channel allocated to wireless broadcasting when it is determined that there is a tune channel increase / decrease request in the second step and the second step; and a channel allocated to wireless broadcasting through the third step. A fourth step of determining whether the range of the minimum and maximum channels is out of range when increasing or decreasing the frequency range corresponding to; and the minimum and maximum channels among the channels allocated to the radio broadcast according to the user's channel selection request in the fourth step. If it is determined that the channel is out of range, the frequency range corresponding to the channel allocated to the cable broadcasting set in the first step is increased or decreased. It includes the fifth step.

An additional feature of the present invention for achieving the above object is that, if the frequency range corresponding to the channel allocated to the cable broadcasting is increased or decreased through the fifth step, it is determined whether it is out of the range of the minimum channel and the maximum channel. If it is determined that it is better to proceed to the second step further comprises the step of increasing or decreasing the frequency domain corresponding to the channel assigned to the wireless broadcast.

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

First, the arrangement of the CATV broadcasting channel and the TV broadcasting channel is as shown in the following table.

Referring to FIG. 2, the search method according to the present invention is as follows.

In step S101, the microprocessor 11 determines whether the user requests the increase / decrease of the channel tuned through the remote control device 8, and if it is determined that the function of changing the channel selection is input, the process proceeds to step S102. In step S102, the mode of the present channel is checked. At this time, if it is not the TV mode, the process ends in step S102.

If it is confirmed in step S102 that the TV mode, the flow advances to step S103 to check the limit range of the mode corresponding to the channel identified in step S102. That is, the station number from the TV second channel to the 69th channel is confirmed.

When the tuning range is confirmed in step S103, the flow advances to step S104 where the tuning channel is increased or decreased according to the number of times the user selects the tuning channel increase / decrease key. At this time, in step S105, it is determined whether the channel selected to be increased or decreased in step S104 reaches a threshold value, that is, whether a channel lower than the TV second channel or a channel higher than the 69th channel is requested.

If it is determined in step S105 that the threshold is out of step, step S106 checks the tuning range according to the new channel mode and proceeds to step S107. In step S107, the tuning channel is increased or decreased in accordance with the number of times the user selects the tuning channel increase / decrease key in the range (CATV first channels, 14-65, 95-99 channels) where the tuning range is confirmed in step S106. At this time, in step S108, it is determined whether the channel selected to increase or decrease in step S107 reaches a threshold value, that is, whether a channel lower than the CATV first channel or a channel higher than the 99th CATV channel is requested.

Accordingly, if the increase / decrease of the channel selected in step S108 exceeds the limit range, the process proceeds to step S102 to circulate.

Therefore, as shown in the above table, in order to perform the above-described process, the channel selection order is TV (2 to 13) → TV (14 to 69) → CATV (1) → CATV (14 to 65) → CATV (95). 99) circulates according to the same procedure as the TVs 2 to 13;

According to the present invention, there is provided a method for channel channel selection of a television broadcast signal according to the present invention, which is very useful for finding a desired channel when selecting a CATV while watching TV or when watching a TV while watching CATV. Since the TC channel is mixed among the CATV channels, it is possible to solve the problem of continuous tuning for duplicate channels.

Claims (2)

A first step of selecting and setting a channel which does not overlap with a wireless broadcasting channel in the area of the cable broadcasting channel; A second step of determining whether a channel selection request of a user exists; A third step of increasing / decreasing a frequency range corresponding to a channel allocated to wireless broadcasting when it is determined that the tuned channel increase / decrease request exists in the second step; A fourth step of judging whether the frequency range corresponding to the channel allocated to the wireless broadcasting is increased or decreased out of the range of the minimum channel and the maximum channel through the third step; And In step 4, if it is determined that the channel range of the channel allocated to the wireless broadcasting is out of the range of the minimum channel and the maximum channel according to the user's channel selection request, the frequency range corresponding to the channel allocated to the cable broadcasting set in the first step is determined. And a fifth step of increasing and decreasing the channel broadcasting method of the television broadcast signal. The method of claim 1, wherein when the frequency range corresponding to the channel allocated to the cable broadcasting is increased or decreased through the fifth step, it is determined whether the deviation is from the range of the minimum channel and the maximum channel. And increasing / decreasing a frequency range corresponding to a channel allocated to the broadcast.