KR20010009506A - Auto cognition apparatus and method of broadcasting system at auto search - Google Patents

Abstract

PURPOSE: A device and method for automatically recognizing a broadcasting system in automatic search is provided to automatically recognize every received broadcasting system for storing when automatically searching TV signals for tuning, so that users can recognize a presently used broadcasting system. CONSTITUTION: A tuner(10) mixes a radio frequency(RF) received to an antenna with an oscillating frequency, to output an intermediate frequency(IF). Surface acoustic wave(SAW) filters(11,12,13) output video IFs(VIFs) and sound IFs(SIFs) from an output of the tuner(10). A video signal processor(20) receives the VIFs among outputs of the SAW filters(11,12,13) to detect and amplify only signals according to a control signal, and demodulates composited video signals, then separates synchronization for outputting. A sound signal processor(30) detects and demodulates the SIFs and signals tuned by a reference frequency. A switch(16) selects and switches one of outputs of the sound signal processor(30) according to a control signal of a microcomputer(40). The microcomputer(40) outputs tuning data to the tuner(10), and outputs a control signal according to transmission systems of set video signals and sound signals. And the microcomputer(40) recognizes kinds of broadcasting systems by the synchronizing signals and tuning signals respectively inputted from the video signal processor(20) and the sound signal processor(30). An electrically erasable programmable read-only memory(EEPROM,18) stores channel data inputted through the microcomputer(40).

Description

AUTO COGNITION APPARATUS AND METHOD OF BROADCASTING SYSTEM AT AUTO SEARCH}

The present invention relates to an apparatus and method for automatically recognizing a broadcasting system during automatic searching, and more particularly, to a broadcasting system for automatically recognizing a broadcasting system when automatically searching for a TV signal of multiple systems. It relates to an automatic recognition device and method.

1 is a block diagram showing the configuration of a conventional broadcasting system automatic recognition device, as shown in the tuning unit 10 for outputting the intermediate frequency (IF) by mixing the radio frequency (RF) flowing into the antenna with the oscillation frequency And a first surface acoustic wave (hereinafter, abbreviated as "SAW") filter 11 for outputting an image intermediate frequency VIF from the output of the tuning unit 10, and the tuning unit 10. A second SAW filter 12 for outputting a frequency modulated (FM) voice intermediate frequency (SIF) at an output, and a third SAW filter for outputting an amplitude modulated (AM) voice intermediate frequency at an output of the tuning unit 10 ( 13), an image signal processor 14 for demodulating and outputting a composite video signal CVBS after detecting and amplifying the output of the first SAW filter 11, and the second and third SAW filters. (12) an audio signal processor (15) for receiving and outputting the output of the detection and demodulation (FM and AM), respectively, A switch 16 for selecting and switching one of the outputs of the audio signal processing unit 15 according to the call, and outputting tuning data to the tuning unit 10, and whether the video signal processing unit 14 has an intermediate frequency signal The microcomputer 17 detects the presence or absence of a radio frequency signal and outputs data to be stored in an EEPROM 18.

An operation process of the conventional apparatus configured as described above will be described with reference to FIG. 2.

FIG. 2 is an exemplary view showing the operation flow of FIG. 1, and as shown therein, a broadcast system (PAL, PAL-i, SECAM-B / G, SECAM-L, NTSC) that the user wants to tune before performing automatic discovery. After the automatic search is performed, the tuning data (Hex code) corresponding to each channel is transferred from the microcomputer 17 to the tuning unit 10 through the bus B1 from the ultra high frequency VHF to the ultra high frequency UHF. Will be sent.

Then, it is determined whether the transmission of the tuning data of the last channel is completed. If not, it is determined whether there is an image signal in the data of the transmitted channel (the tuning unit 10 having received the tuning data outputs an intermediate frequency IF). If the image signal processing unit 14 received through the SWA1 11 receives the IF and RF identification signals output through the bus B3 from the microcomputer 17 and determines whether there is a signal), the corresponding channel data is detected. The data is stored in the EPI rom 18, and it is again determined whether the transmission of the tuning data of the last channel is completed. If it is determined that there is no signal, the channel is increased to continue tuning.

As described above, in the conventional technology, the user has to select and designate one of TV's various broadcasting systems (PAL, NTSC, etc.) before the automatic search to catch a broadcast signal. there was.

Accordingly, the present invention has been made to solve the above-described problems, and provides an apparatus and method for automatically recognizing a broadcast system when automatically searching for a TV signal. There is a purpose.

1 is a block diagram showing the configuration of a conventional broadcasting system automatic recognition device.

2 is an exemplary view showing an operation flow of FIG.

Figure 3 is an exemplary view showing the configuration of the present invention broadcast system automatic recognition device.

4 is a block diagram illustrating a configuration of an image signal processor of FIG. 3.

FIG. 5 is a block diagram illustrating a configuration of a voice signal processor of FIG. 3.

6 is an operational flowchart of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

20: image signal processor 21: detector

22: amplification unit 23: video signal demodulation unit

24: Burst detector 25: Vertical / horizontal synchronous separator

30: voice signal processor 31: FM detector

32: AM detector 33: VCO

34: FPLL 35: FM demodulator

36: AM demodulator 40: Micom

In order to achieve the above object, a configuration of an automatic recognition apparatus for broadcasting system according to the present invention includes a tuning unit for outputting an intermediate frequency (IF) by mixing radio frequency (RF) flowing into an antenna with an oscillation frequency, and the tuning. A plurality of surface acoustic wave (abbreviated as "SAW") filters that output an image intermediate frequency (hereinafter abbreviated as "VIF") and an audio intermediate frequency (hereinafter abbreviated as "SIF") at a negative output. And a video signal processor for demodulating a complex video signal (CVBS) and outputting the synchronization after demodulating only a signal according to a control signal by receiving VIF among the outputs of the plurality of SAW filters. A voice signal processor for detecting and demodulating (FM and AM) the signals tuned by the SIF and the reference frequency among the outputs of the two SAW filters, and the voice signal processor according to the control signal of the microcomputer. A switch for selecting and switching one, outputting tuning data to the tuning unit, outputting a control signal according to a transmission method of a set video signal and an audio signal, and a synchronization signal and a tuning signal respectively input from the video and audio signal processing unit A microcomputer that recognizes the type of broadcasting system and controls to perform an operation according to the present invention; Characterized in that the storage unit for storing the channel data input through the microcomputer.

In the method, when the automatic search is started, it is determined whether the transmission of the tuning data of the last channel is completed. When the automatic search is completed, the automatic search operation is finished. If not, the method determines whether there is an image signal in the data of the transmitted channel. Step 1; A second step of increasing the channel to return to the first step if there is no video signal as a result of the determination in the first step, and determining which band is the synchronization frequency if there is a video signal as a result of the determination; A third step of setting to NTSC if the result of the determination of the second step is 60 ms, storing and returning to the first step, and determining the magnitude of the burst level if the level is 50 ms; A fourth step of determining which band is the burst frequency when the determination result of the third step is 'low' after setting to SECAM-L and storing and returning to the first step; If the result of the determination in the fourth step is 4.43 MHz, then the PAL-B / G, PAL-D / K, and PAL-I are set and stored according to the bands tuned by the frequency phase synchronization loop, and then returned to the first step. A fifth step; If the result of the fourth step is 4.25 or 4.4 MHz, the mobile station returns to the first step after setting and storing SECAM-B / G and SECAM-D / K according to the bands tuned by the frequency phase synchronization loop, respectively. Characterized in consisting of steps.

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

3 is an exemplary view showing a configuration of an automatic recognition system of the present invention, FIG. 4 is a block diagram showing the configuration of the video signal processor of FIG. 3, and FIG. 5 is a block diagram showing the configuration of the audio signal processor of FIG. As shown here, the tuning unit 10 for outputting the intermediate frequency (IF) by mixing the radio frequency (RF) flowing into the antenna with the oscillation frequency; Surface acoustic waves (Surface Acoustic Wave, which outputs the image intermediate frequency (hereinafter abbreviated as "VIF") and the audio intermediate frequency (hereinafter abbreviated as "SIF") from the output of the tuning unit 10 (Surface Acoustic Wave, (Abbreviated as "SAW") filters 11 to 13; A detector 21 for detecting one of the video signals input according to the transmission method by a control signal, an amplifier 22 for amplifying the output of the detector 21, and an image for demodulating the composite video signal CVBS. A signal demodulator 23, a burst detector 24 for receiving the output of the video signal demodulator 23 to detect the magnitude of a burst signal, and an output of the video signal demodulator 23 for synchronization An image signal processing unit 20 including a vertical / horizontal synchronization separator 25 for separating and outputting a frequency of a signal; A voltage controlled oscillator 33 for generating a reference frequency proportional to a set reference voltage, a frequency phase synchronization loop (FPLL, 34) for tuning the SIF signal at a predetermined distance from the reference frequency, and a signal synchronized with the SIF signal FM and AM detectors 31 and 32 for detecting the respective signals and FM and AM demodulators 35 and 36 for demodulating the signals output from the FM and AM detectors 31 and 32, respectively. A voice signal processor 30; A switch 16 for selecting and switching one of the outputs of the audio signal processing unit 30 according to the control signal of the microcomputer 40 and outputting tuning data to the tuning unit 10, and the set video signal and audio signal. The microcomputer outputs a control signal according to a transmission method of the control unit, and recognizes a type of a broadcasting system based on a synchronization signal and a synchronization signal input from the video and audio signal processing units 20 and 30, respectively, and controls to perform the operation accordingly. 40; The Y pyrom 18 stores channel data input through the microcomputer 40.

Referring to Figure 6 attached to the operation of the embodiment according to the present invention configured as described above are as follows.

FIG. 6 is a flowchart illustrating an operation of the present invention. As shown in FIG. 6, when a user executes an automatic search on an on-screen display (OSD) menu to watch a broadcast, the tuning data corresponding to each channel in the microcomputer 40 (Hex code) is shown. ) Is transmitted to the tuning unit 10 from the ultra high frequency wave (VHF) to the ultra high frequency wave (UHF) through the bus U1.

When the tuning data and the RF signal are synthesized and output from the tuning unit 10, the tuning signal 10 is inputted by the image signal processing unit 20 through the first SAW filter 11, and at this time, the video signal transmission scheme preset to the microcomputer 40. The signal is output to the detector 21 so as to detect only the video signal (for example, if the video signal transmission method is a negative transmission method, only the video signal corresponding thereto is detected by the detection unit). The signal output from the detector 21 is amplified by the amplifier 22, demodulated through the image signal demodulator 23, and output to the RGB signal processor 19. The demodulated signal is burst detected 21 ) And a burst level, a magnitude, and a synchronization signal, respectively, are input from the vertical / horizontal synchronization separator 25 and transmitted to the microcomputer 40 through the bus U3 with or without an IF signal.

At this time, the microcomputer 40 determines whether the transmission of the tuning data of the last channel is completed (step 1). If the transmission is completed, the automatic search operation is terminated (step 2), and if not, the transmitted IF The signal is detected to determine whether there is an image signal in the transmitted channel data (step 3).

If there is no video signal as a result of the determination in step 3, the channel is increased to return to step 1, and if there is a video signal, the microcomputer 40 enters a band in which the input synchronization frequency is present. It is determined whether or not (50 or 60 ms) (step 5). If the determination result is 60 ms, it is set as NTSC and stored in the Y pyrom 18, and the process returns to the above (step 1) (step 6).

However, if the result of the determination is 50 ms, the magnitude of the burst level is determined (step 7). If the burst level is 'low' (100 mV _PP or less), it is set to SECAM-L and the Y pyrom (18) is determined. ), And return to the step (step 1) (step 8), and if the determination result is' high (100mV _PP or more), it is determined which band (4.43 or 4.25 or 4.40MHz) the burst frequency (step) 9).

If the burst frequency is 4.43 MHz as a result of the determination in step 9, the current system first determines that one of PAL-B / G, PAL-D / K and PAL-I is used, and then the voice signal processor 30 The output of the FM detector (or AM detector) according to the band (5.5, 6.0 or 6.5 MHz) tuned by the frequency phase synchronizer loops (FPLL, 34), respectively, to PAL-B / G when the microcomputer 40 is 5.5 MHz. If it is 6.0 MHz, it is recognized as PAL-D / K, and if it is 6.5 MHz, it is recognized as PAL-I and stored in the ypyrom 18, and then the process returns to step 1 (step 10).

However, if the determination result of step 9 is 4.25 or 4.4 MHz, it is recognized as SECAM-B / G and SECAM-D / K, respectively, according to the band (5.5 or 6.5 MHz) tuned by the FPLL 34, respectively. After storing in the ypyrom 18, the process returns to the step 1 (step 11).

As described above, the apparatus and method for automatically recognizing a broadcast system when searching for a TV according to the present invention has no inconvenience in that a user must directly select a broadcast system when searching for a TV broadcast, and automatically recognizes all received broadcast systems. By storing it, it is effective to immediately know if the user does not know what broadcasting system is currently watching.

Claims (4)

A tuning unit for outputting the intermediate frequency (IF) by mixing the radio frequency (RF) flowing into the antenna with the oscillation frequency, the image intermediate frequency (hereinafter abbreviated as "VIF") and the audio intermediate frequency (from the output of the tuning unit) A plurality of surface acoustic wave filters (hereinafter, abbreviated as "SIF") and a SAF filter and a VIF among the outputs of the plurality of SAW filters are detected to detect only a signal according to a control signal. And after amplifying, demodulating the composite video signal (CVBS) and outputting the synchronization separately, and detecting and demodulating the signals tuned by the SIF and the reference frequency among the outputs of the plurality of SAW filters. And a switch for selecting and switching one of an output of the audio signal processing unit according to the control signal of the microcomputer, and outputting tuning data to the tuning unit. A microcomputer that outputs a control signal according to a transmission method of an image signal and an audio signal, and recognizes a type of a broadcasting system based on a synchronization signal and a synchronization signal input from the video and audio signal processing units, respectively, and performs a control operation accordingly; ; And a storage unit for storing channel data input through the microcomputer. The apparatus of claim 1, wherein the video signal processor is configured to detect one of the video signals inputted according to a transmission method by a control signal, an amplifier to amplify the output of the detector, and a complex video signal (CVBS). A video signal demodulator, a burst detector that detects the magnitude of a burst signal by receiving the output of the video signal demodulator, and a vertical / horizontal signal that separates and outputs the frequency of the synchronization signal by receiving the output of the video signal demodulator Broadcasting system automatic recognition device for automatic search, characterized in that the synchronization separator. 2. The apparatus of claim 1, wherein the voice signal processor comprises: a voltage controlled oscillator for generating a reference frequency proportional to a set reference voltage, a frequency phase synchronizer loop (FPLL) for tuning the SIF signal at a predetermined distance from the reference frequency; And an FM and AM demodulator for demodulating the signals output from the FM and AM detectors, respectively. Determining whether transmission of the tuning data of the last channel is completed when the automatic search starts, and when the automatic search is completed, ending the automatic search operation; if not, determining whether there is an image signal in the data of the transmitted channel; A second step of increasing the channel to return to the first step if there is no video signal as a result of the determination in the first step, and determining which band is the synchronization frequency if there is a video signal as a result of the determination; A third step of setting to NTSC if the result of the determination of the second step is 60 ms, storing and returning to the first step, and determining the magnitude of the burst level if the level is 50 ms; A fourth step of determining which band is the burst frequency when the determination result of the third step is 'low' after setting to SECAM-L and storing and returning to the first step; If the result of the determination in the fourth step is 4.43 MHz, then the PAL-B / G, PAL-D / K, and PAL-I are set and stored according to the bands tuned by the frequency phase synchronization loop, and then returned to the first step. A fifth step; If the result of the fourth step is 4.25 or 4.4 MHz, the mobile station returns to the first step after setting and storing SECAM-B / G and SECAM-D / K according to the bands tuned by the frequency phase synchronization loop, respectively. Broadcasting system automatic recognition method for automatic search, characterized in that consisting of steps.