KR19980031186A - Channel Tuning Apparatus and Method of Arm / Sekam Video Cassette Recorder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for setting an auto set according to a broadcasting system of a video cassette recorder employing a voltage synthesized (VS) tuning method. / When performing auto set in the broadcasting area adopting the Secam broadcasting method, the broadcasting method is discriminated from the broadcasting signal of the frequency band where the synchronization signal is detected according to the presence or absence of the Sekam high signal, and the channel of the broadcasting method is selected in response to the determination result. A channel tuning device for a Pal / Secam video cassette recorder and a method thereof are provided.

To this end, the present invention includes an autoset key signal determination step of determining whether a key signal for performing autoset is applied; Performing channel channel selection operation to start channel channeling operation when a key signal for performing auto set is applied; A broadcast method discrimination step of determining a broadcast method according to channel channel selection operation; And a corresponding broadcast signal processing step of operating in a signal processing system corresponding to the determined broadcast method, thereby reducing channel channeling time required for auto set.

Description

Channel Tuning Apparatus and Method of Arm / Sekam Video Cassette Recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for setting an auto set according to a broadcasting system of a video cassette recorder employing a voltage synthesized (VS) tuning method. And a channel selecting apparatus of the PAL / SECAM video cassette recorder for determining a broadcasting method and tuning a channel according to the determination result when performing an auto set in a broadcasting area adopting the Secam broadcasting method.

As is well known, the VS tuning method sequentially tunes a channel from a low frequency broadcast signal to a high frequency broadcast signal by voltage, and the microcomputer integrates a VS pulse (pulse width modulation) signal to convert it into a DC voltage. It then supplies it to the tuner, and therefore the tuner refers to the way in which the channel is tuned as the DC voltage changes.

On the other hand, the television broadcasting system can be divided into NTSC, PAL and SECAM system, accordingly video cassette recorder is also divided into NTSC, PAL and SECAM system.

Here, the NTSC (National Television System Committee) method is widely adopted mainly in Japan, the United States, Canada, and the like. The color signal, that is, the R, G, and B signals is converted into one luminance signal (Y) and two color differences (I). , Q) and then modulate a subcarrier with a frequency of 3.58 MHz in the video band with two chrominance signals. The composite signal obtained by combining the modulated color difference signal and the luminance signal modulates and transmits a carrier having a higher frequency and has 525 scan lines.

On the other hand, PAL (Phase Alternation Line) method is adopted by Europe and China such as UK, Germany, Italy, Switzerland, and two-color right angle two-color subcarrier by two color difference signals BY and RY different from NTSC method. The signal obtained by modulating and transmitting in addition to the luminance signal is transmitted by inverting the polarity by 180 ° per scan line 1H. The receiving side reproduces the color difference signal by the sum and difference of the color difference signals. The PAL method is called PAL-M because the number of scan lines is 625 and the scan line signal is 525.

SECAM (Sequential Couleur A Memory) method is east of France. In the method adopted by the former Soviet Union, the color subcarriers are alternately frequency-modulated by two color difference signals for each scanning line 1H, and the modulated color difference signals are superimposed on the luminance signal and transmitted every 1H, and the receiving side transmits the signal every 1H. It is a color television system that reproduces colors on the same scan line by delaying.

In this case, the secam / arm combined video cassette recorder has a difference in the signal system in an area in which the secam signal and the arm signal are simultaneously received. For example, the secam method has a sync polarity and the arm method is negative. Because it is positive, when the autoset is set, the microcomputer randomly supplies the reference signal, that is, the Secam 'high' signal, to automatically tune the channel to the Secam broadcast signal first, in order to process the signal to the tuner using the Secam method. Then, the Secam 'high' port was switched to 'low' to automatically tune channels to eight broadcast signals, and information about the tuned channels was stored in the memory.

Therefore, when auto set is set, channel tuning time takes a long time because the channel tuning operation is repeatedly performed for the arm and secam from the broadcast signal of the low frequency band to the broadcast signal of the high frequency band.

On the other hand, the autoset setting is performed by the video cassette recorder receiving information, such as time data and broadcasting station data, provided from a broadcasting station through a video teletext data line during the vertical blanking period, and decoding the same to perform the following operation. There are channel setting function, automatic clock setting function, video flush channel preset memory function, automatic reservation recording control function, etc.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a video / video cassette recorder with a VS tuning method, which is based on a broadcast signal of a frequency band in which a synchronization signal is detected during autoset. A channel tuning apparatus of an ARM / Secam video cassette recorder for shortening channel tuning time by storing channel data of a broadcasting method determined by determining a broadcasting method and tuning a channel according to the determined broadcasting method, and providing the method There is.

According to another aspect of the present invention, there is provided a channel tuning apparatus for an arm / secam video cassette recorder for performing auto set, comprising: a key input unit for providing a key signal for performing the auto set; When the auto set execution key signal is provided from the key input unit, a tuning voltage is applied, and control is performed to store the broadcast channel data according to the provided synchronization signal and the broadcast method data of the provided broadcast method determination signal, and the determined broadcast method. A microcomputer providing a control signal for signal processing; A tuner for tuning a broadcast signal in response to the tuning voltage applied from the microcomputer and providing a tuned broadcast signal; A video signal processor configured to process a video signal of a broadcast signal provided by the tuner to detect a sync signal, and to provide the detected sync signal to the microcomputer; An IF signal processor for outputting a video signal of a broadcast signal applied from the tuner and processing the signal in a broadcast manner according to the control of the microcomputer; An arm / secam method discriminating unit for determining an arm / secam method based on an image signal provided by the IF signal processor and providing a discrimination result signal to the micom; And a memory configured to store the corresponding broadcast channel data and the broadcast method data under the control of the microcomputer.

Another feature of the present invention for achieving this object is an autoset key signal determination step of determining whether a key signal for performing autoset is applied; Performing a channel channeling operation to start a channel channeling operation when a key signal for performing the autoset is applied; A broadcast method discrimination step of determining a broadcast method according to the channel selection operation; And a corresponding broadcast method signal processing step of operating as a signal processing system corresponding to the determined broadcast method.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

1 is a block diagram of a channel selection apparatus of an arm / secam cassette recorder according to the present invention;

2 is a flowchart for performing a channel tuning method in an arm / secam method according to the present invention.

3 is a diagram illustrating an arm / sekam channel selection process on a screen;

* Description of the symbols for the main parts of the drawings *

100: key input unit 102: micom

104: tuner 106: IF signal processing unit

108: image signal processing unit 110: arm / Secam method determination unit

112: OSD unit 114: memory

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

1 is a block diagram of a channel selection apparatus of an ARM / Secam video cassette recorder according to the present invention, which includes a key input unit 100, a microcomputer 102, a tuner 104, an intermediate frequency signal processing unit 106, and an image. Signal processing unit 108, arm / Secam method determination unit 110. OSD (on screen display) 112, the memory 114 is composed of.

The key input unit 100 is composed of key metrics as input means for operating a video cassette recorder, including a play key, a recording key and a numeric key for inputting reserved recording information, and an auto set execution key for carrying out the present invention. A key signal corresponding to a user's key operation is applied to the microcomputer 102, which will be described later, and detects and outputs a key signal carried on an infrared carrier wave from a remote control using a remote control that can be input at a remote location. .

At this time, the microcomputer 102 is configured to control the overall operation of the video cassette recorder, as is well known. As described above, a key signal output from the key input unit 100, that is, a signal for the autoset execution key is received. When applied, the microcomputer 102 integrates the tuning voltage, ie, the PWM signal, converts the DC voltage into the DC voltage, and applies the tuner 104 to the tuner 104. The tuner 104 tunes the channel according to the change of the applied tuning voltage. The broadcast signal of the channel is outputted to the IF signal processing unit 106.

Accordingly, when the IF signal processor 106 outputs the video signal of the demodulated broadcast signal output from the tuner 104 to the video signal processor 108 and the arm / secam method discriminator 110, the video signal processor 108 may output the video signal. The controller processes the output image signal, sends the same to the OSD unit 112, detects the synchronization signal, and applies it to the microcomputer 102.

At this time, the arm / Secam method determining unit 110 detects the presence or absence of the Secam signal from the image signal output from the IF signal processing unit 106, and determines whether the Secam method or the arm method is used according to the detection result, and the resulting signal. Output to the microcomputer 102.

Thus, as described above, the microcomputer 102 stores the corresponding channel data according to the synchronization signal output from the image signal processing unit 108 and the broadcasting method data according to the determination signal output from the arm / seccam determination unit 110. To control.

In this case, unlike the RAM, the memory 114 does not require a backup battery, and unlike an ultraviolet erasing EPROM, the memory 114 is composed of an electrically erasable programmable ROM (EEPROM) that is rewritable as an electrically erasable ROM. According to the control, the channel data and broadcast method data are stored, and the stored data is transmitted to the microcomputer 102 upon request of the microcomputer 102.

Meanwhile, as illustrated in FIG. 3, the OSD unit 112 displays a channel tuning process on the screen 300 under the control of the microcomputer 102, and reference numeral 302 denotes performing an autoset. Reference numeral 304 denotes the broadcast method of the channel currently tuned in, reference numeral 306 denotes the broadcast station name, reference numeral 308 denotes the number of storages of the memory 114 of the channel currently tuned in, and the reference number ( Reference numeral 310 denotes a broadcast frequency band that is being tuned, and reference numeral 312 denotes a unit which is% and indicates a position currently tuned in for each broadcast frequency band.

FIG. 2 is a flowchart for performing a channel tuning method of an arm / secam video cassette recorder according to the present invention, which will be described with reference to the block diagram shown in FIG.

First, the microcomputer 102 determines whether a signal for the auto set execution key is provided from the key input unit 100 in step 200.

As a result of the determination, when a signal for the auto set execution key is provided from the key input unit 100, the process proceeds to step 202, and outputs a tuning voltage to the tuner 104 to perform channel tuning. The process proceeds to step 204. The broadcasting method is determined according to a signal from the broadcasting method discrimination result provided by the secam method determination unit 110.

That is, when the Secam high signal is detected from the arm / Sekam method discrimination unit 110, the microcomputer 102 controls the IF signal processor 106 to process the Secam high signal in step 206, and the Secam high signal. If is not detected, the flow proceeds to step 208 to control the IF signal processor 106 to perform signal processing in an arm manner, and proceeds to step 210 to complete the channel tuning operation.

As described above, the channel tuning apparatus and the method of the Pal / Secam video cassette recorder according to the present invention detect the presence or absence of the Secam high signal from the broadcast signal of the frequency band in which the synchronization signal is detected during the autoset. When the signal is detected, it is possible to process the signal by the Secam method, and when the Secam high signal is not detected from the broadcast signal of the frequency band in which the synchronization signal is detected, the signal processing is performed by the arm method. It is effective to shorten.

While the invention has been shown and described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various modifications, changes and omissions can be made without departing from the spirit and scope of the invention.

Claims (4)

An apparatus for channel selection of an arm / secam video cassette recorder for performing auto set, comprising: a key input unit (100) for providing a key signal for performing the auto set; When the auto-set execution key signal is provided from the key input unit 100, a tuning voltage is applied, and control is performed to store the broadcast channel data according to the provided synchronization signal and the broadcast method data of the provided broadcast mode determination signal. A microcomputer 102 providing a control signal for signal processing in a broadcast manner; A tuner (104) for tuning a broadcast signal in response to the tuning voltage applied from the microcomputer (102) and providing a tuned broadcast signal; An image signal processor (108) for processing a video signal of a broadcast signal provided by the tuner (104) to detect a synchronization signal, and providing the detected synchronization signal to the microcomputer (102); An IF signal processor (106) for outputting a video signal of a broadcast signal applied from the tuner (104) and processing the signal in a broadcast manner according to the control of the microcomputer (102); An arm / secam method determination unit 110 for determining an arm / secam method based on an image signal provided by the IF signal processor 106 and providing a determination result signal to the micom; And a memory (114) for storing the broadcast channel data and the broadcast method data according to the control of the microcomputer (102). An autoset key signal determination step 200 of determining whether a key signal for performing autoset is applied; Performing channel channel selection operation to start channel channeling operation when a key signal for performing autoset is applied; A broadcast method discrimination step (204) for determining a broadcast method according to the channel selection operation; And a corresponding broadcast method signal processing step (206, 208) operating as a signal processing system corresponding to the determined broadcast method. 3. The method of claim 2, wherein the step of determining the broadcast method detects a Secam high signal. 4. The method of claim 3, wherein if the Secam high signal is detected, the signal processing is performed in the Secam method, and if the Secam high signal is not detected, the signal processing is performed using the arm method.