KR200176961Y1 - Apparatus for warning misoperation of the sound multiplex through detectioning voltage of color killer in weak signal - Google Patents

Abstract

The present invention relates to an apparatus for warning multiple voice signals when there is no signal through the detection of a color killer voltage, and detects the voltage generated from the color killer unit when the signal does not operate when the signal is below a certain level. The present invention relates to an apparatus for displaying a warning message on an OSD screen under the control of. That is, the present invention utilizes the detection function of the signal received from the antenna, the color killer voltage detection function, and the OSD function. By determining the voltage generated to reproduce a good image in the killer section, the OSD screen displaying the non-signal warning message is displayed on the screen of the television, allowing viewers to quickly select another broadcast channel. The present invention proposes a multiple warning system of no-voice audio signal through the detection of color killer voltage which improves the stability and reliability of a television system.

Description

Voice multiple malfunction warning device without signal by detecting color killer voltage

The present invention relates to an apparatus for warning multiple voice signals when there is no signal through the detection of a color killer voltage, and detects the voltage generated from the color killer unit when the signal does not operate when the signal is below a certain level. The present invention relates to an apparatus for warning multiple voice malfunctions in the absence of a signal through the detection of a color killer voltage which causes a warning message to be displayed on a screen of a television by controlling.

In general, the voice multiplexing method is a two carrier (TWO CARRIER) method using two radio waves with different frequencies, that is, a video wave, a voice wave 4.5MH _Z higher than the image wave, and another voice wave 4.7242MH _Z higher than the image wave. At the same time, a method of firing has been adopted. In the case of the multi-audio broadcasting, stereo broadcasting, such as FM stereo broadcasting, and simultaneous broadcasting of Korean and foreign languages (news, foreign films, etc.), and in the case of the stereo broadcasting, the first voice carrier is used. A signal obtained by combining the left and right signals (L + R = MONO signals) is transmitted by frequency modulation, and the left and right difference signals (LR signals) and auto recognition signals are frequency-modulated and transmitted to the second carrier.

Here, the IDENTIFICATION SIGNAL is a signal sent every vertical retrace period (corresponding to a pilot signal in FM stereo broadcasting) so that the receiver can distinguish between stereo broadcasting or two voice multiple broadcasting. Signal), the stereo signal is 55.07KH _Z (3.5 times the horizontal synchronization signal frequency) to the sub-carrier (SUB-CARRIER) to 149.9H _Z (1/105 of the horizontal synchronization signal frequency) It is a 50% amplitude modulated signal. In case of two voice multiple broadcasting, 55.07KH _Z is 276.0H _Z (1/57 of the horizontal synchronization signal frequency).

In addition, the frequency shift of the first and second voice waves is ± 25KH _Z. However, in the case of the second voice wave, the automatic recognition signal ± 2.5KH _Z is further added to become ± 27.5KH _Z. The reason for designating the frequency as a specific frequency that has a constant relation with the horizontal synchronization signal (15734.26H _Z ) is that the video signal and the color carrier, and the audio carrier and the synchronization signal interfere with each other, thereby adversely affecting the video signal or the audio channel. To minimize crosstalk in the liver and reduce bandwidth effectively.

However, when no signal is detected in the voice multicasting as described above, there is a problem in that the normal voice multicasting is not output because the output state is not good, such as noise is inserted into the voice or noise is added to the screen.

The present invention was devised to solve the above problems, and an object of the present invention is to detect a signal received from an antenna, a color killer voltage detection function, and an OSD function. In this case, the color killer unit is configured to determine the voltage generated by the color killer unit in the color reproduction unit when receiving the color broadcast, and to detect the color killer voltage which causes the OSD screen display to display the warning message on the screen of the television. It is to provide a voice multiple malfunction warning device when signaling.

1 is a block diagram showing an apparatus for warning multiple voice malfunction when no signal through the detection of a color killer voltage according to the present invention.

FIG. 2 is a block diagram showing a color reproduction unit that is a main part of FIG.

Figure 3 is a flow chart for explaining the voice multiple malfunction warning device when no signal through the detection of the color killer voltage of the present invention.

<Description of the symbols for the main parts of the drawings>

100: antenna 110: tuner circuit

120: IF amplifier 130: image detector

140: second filter 150: second voice demodulation unit

160: recognition signal detection unit 170: switch unit

180: second amplifier 190: matrix circuit

200: first filter 210: first voice demodulator

220: first amplifier 230: microcomputer

240: signal detector 250: image amplifier

260: voltage detector 270: OSD driver

281: first band amplifier 282: second band amplifier

283: ACC unit 284: color synchronization unit

285: color killer 286: demodulation

287: output unit 290: CRT drive unit

300: CRT

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment for achieving the object of the present invention.

1 is a block diagram showing a voice multiple malfunction warning device when no signal by detecting the color killer voltage according to the present invention.

Referring to FIG. 1, the present invention performs a high frequency amplification of a video signal of a channel selected for display on a screen among high frequency signals received through an antenna 100, and mixes with an oscillation frequency oscillated by channel selection. A tuner unit 110 for converting to an intermediate frequency for easy amplification and then amplifying to generate a composite video signal, an IF amplifier 120 for intermediately amplifying the composite video signal applied from the tuner unit 110, and The intermediate frequency signal amplified from the IF amplifier unit 120 is AM-detected and the video signal, the first audio signal (4.5MH _Z FM wave) and the second audio signal (4.7242MH _Z FM wave) An image detector 130 for extracting the mixed composite signal, a first filter 200 for passing only the first audio signal of 4.5MH _Z among the composite signals applied from the image detector 130, and the first 4.5 MH _Z from filter 200 First amplifying the first audio demodulator 210, a low-frequency audio signal applied from the first sound demodulation section 210 receives an FM signal is to retrieve the first audio signal (low frequency signal of 50-15000H _Z) A second filter 140 for passing only a second audio signal of 4.7242 MH _{Z out} of the amplification unit 220 and the complex signal applied from the image detector 130, and 4.7242 MH _Z from the second filter 140. A second voice demodulator 150 for receiving a second voice signal (50-15000H _Z low frequency signal) by receiving the FM signal of the first and amplified voice low frequency signal applied from the second voice demodulator 150 A recognition signal detection unit 160 for AM detecting the automatic recognition signal included in the second amplifier 180 and the second voice demodulator 150 and extracting the recognition signal; and the first amplifier 220 and the first amplifier. The second audio unit 180 receives the first audio signal (L + R signal) and the second audio signal (LR signal) and synthesizes (adds) in phase. Or if the reverse phase synthesis (subtracted) to the matrix circuit 190 is to separate the L signal and the R signal, the frequency of the first recognition signal applied from the recognition signal detection unit 160 is the one 149.9H _Z matrix circuit While allowing the stereo output applied from the 190 to pass through, if the frequency of the second recognition signal applied from the recognition signal detection unit 160 is 276H _Z , the circuit is output without passing through the matrix circuit unit 190 A switch unit 170 for changing a signal, a signal detector 240 for detecting an input signal from the IF amplifier 120 and applying it to the microcomputer 230, a video signal output from the image detector 130, and The image amplification unit 250 amplifies the luminance signal, and the original color difference signal is generated from the image signal applied from the image amplification unit 250 and amplified so as to be displayed on the CRT 300 and applied to the CRT driving unit 290. The color reproducing unit 280 receives and processes the OSD RGB signal from the OSD driving unit 270, and a voltage detecting unit detecting the voltage generated from the color reproducing unit 130 and applying it to the microcomputer 230. 260, an OSD driver 270 that receives an OSD driving control signal from the microcomputer 230 and outputs an OSD RGB signal, and a signal and a voltage detected by the signal detector 240 and the voltage detector 260, respectively. After being applied, the microcomputer 230 applies an OSD driving control signal to the OSD driver 270.

Hereinafter, the operation of one embodiment of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, the radio wave received through the antenna 100 is selectively selected by the tuner unit 110, and then converted into an intermediate frequency that is easy to amplify and amplified by an IF amplifier unit 120 to be an intermediate frequency amplifier. 130). The image detector 130 obtains and outputs a composite signal in which the video signal, the first audio signal, and the second audio signal are mixed by AM detection of the intermediate frequency signal applied from the IF amplifier 120. That is, the 4.5MH _Z FM signal, which is the first audio signal output from the image detector 130, includes L + R (a combination of a left signal and a right signal) when stereo broadcasting is performed. In the case of voice broadcasting (Korean and foreign languages), Korean will be heard. In addition, the FM signal of 4.7242MH _Z , which is the second audio signal, includes an LR signal when the stereo broadcast is performed, and a foreign language and a recognition signal when the bilingual broadcast is included. In this case, the recognition signal is 0H _Z.

In addition, since the first audio signal and the second audio signal are mixed in the composite signal output from the image detector 130, only the first audio signal passes through the first filter 200, and the second filter passes. Only the second audio signal passes through 140. The first audio signal output from the first filter 200 is extracted by the first low frequency audio signal by the first audio demodulator 210, and the second audio signal output from the second filter 140 is The second low frequency voice signal is extracted by the second voice demodulator 150 and amplified through the first amplifier 220 and the second amplifier 180 and output to the matrix circuit 190. The matrix circuit unit 190 adds and subtracts the first audio signal and the second audio signal amplified from the first amplifier 220 and the second amplifier 180 to apply an L signal (left signal) and an R signal. It is separated into a signal (right signal). The separated L and R signals are expressed as follows.

Here, the recognition signal detector 160 is connected between the second voice demodulator 150 and the second amplifier 180 to detect the recognition signal from the second voice demodulator 150 to switch unit 170. When the signal applied from the recognition signal detection unit 160 is the first recognition signal, the switch unit 170 allows the stereo output applied from the matrix circuit unit 190 to pass through, and the recognition signal. When the signal applied from the detection unit 160 is the second recognition signal, the circuit is changed to be output without passing through the matrix circuit unit 190.

On the other hand, the signal detector 240 connected to the IF amplifier 120 detects the non-signal output from the IF amplifier 120 and applies it to the microcomputer 230, the signal-free from the signal detector 240 The microcomputer 230 is applied to determine the voltage detected and applied by the voltage detection unit 250 connected to the color reproduction unit 280 from the color reproduction unit 280. That is, the color killer 286 in the color reproduction unit 280 generates an appropriate DC voltage at the time of color broadcast reception, and applies it to the second band amplifier 283 to operate the voltage 225. At this time, the measured voltage is about 3.8. It becomes V.

Therefore, the microcomputer 230 determines whether a signal is present or no signal based on the voltage applied by the voltage detector 260, and when the applied voltage is not 3.8V, determines that the signal is no signal to drive the OSD to the OSD driver 270. A control signal is applied, and the OSD driver 270 receiving the OSD driving control signal from the microcomputer 230 applies a OSD RGB signal to the color reproducing unit 280 to warn the user of no signal on the screen of the television. Will output

2 is a block diagram illustrating a color reproducing unit, which is a main part of FIG. 1, wherein the color reproducing unit 280 includes a first band amplifying unit 282 and a second for selectively amplifying a frequency band of a carrier color signal component included in an image signal. Operation of the band amplifier 283 including the band amplifier 283, the color synchronizer 285 for generating color carriers necessary for the detection of the chroma signal, and the second band amplifier 283 at the time of monochrome broadcast reception. A color killer unit 286 for stopping, an ACC unit 284 for automatically controlling the gain of the first band amplifier 282, and a demodulator 287 for detecting a chromaticity signal from a carrier color signal using the color carrier; And an output unit 288 that receives and outputs a chroma signal from the demodulator 287 and receives an OSD RGB signal from the OSD driver 270.

Hereinafter, the operation of the color reproduction unit will be described in detail with reference to the accompanying drawings.

First, since color information implemented on a screen of a television is included in a frequency band of 3.58 ± 0.5MH _Z of a color television signal, the color reproduction unit 280 needs a signal of only the frequency band, and the band amplification. The unit 281 selects and amplifies only the frequency band of 3.58 ± 0.5MH _Z and outputs it to the color synchronizer 285 and the demodulator 287. The color synchronizer 285 extracts a burst signal inserted into the back porch of the horizontal sync signal from the carrier color signal applied from the band amplifier 281 and returns it to the original color difference signal. A color portion carrier, which is a continuous wave of 3.58 MH _Z , which maintains a constant phase difference, is generated and output to the demodulation unit 287. The ACC unit 284 is a burst detected by the color synchronization unit 285 through a band amplifier 281. The gain of the first band amplifier 282 is controlled by the amplitude of the signal. That is, when the saturation of the screen changes irregularly or only the saturation changes due to channel replacement, the ACC unit 284 changes the level difference between the luminance signal and the carrier color signal due to the variation of the received radio wave and the mismatch of the antenna. By automatically adjusting the gain of the one-band amplifier 282, the level of the carrier color signal applied to the demodulator 287 is kept constant.

In addition, the color killer 286 receives a burst signal from the color synchronizer 285 and controls the operation of the second band amplifier 283. That is, when the color killer unit 286 receives a black and white broadcast, when the color reproducing unit 280 is operated, 3.5MH _Z component and noise component of the luminance signal are mixed into the color reproducing unit 280 and the black and white broadcast is received. Color noise is generated in the image, and the noise of the image is canceled by blocking the operation of the second band amplifier 283 except when receiving color broadcast.

The demodulator 287 demodulates the carrier color signal applied from the band amplifier 281 with the color carriers applied from the color synchronizer 285 to detect three color difference signals required by the CRT 300. . The output unit 288 adds the luminance signal and the color difference signal amplified by the image amplifier 250 and the color reproduction unit 280, respectively, and inputs three primary color signals of red, green, and blue, and then the CRT driver. While amplifying to the required size at 290, the OSD driver 270 receives an OSD RGB signal to amplify and process the OSD so that an OSD screen is displayed on the screen of the television.

Next, with reference to Figure 3 will be described a flow chart showing a non-signal voice multiple malfunction warning device by detecting the color killer voltage of the present invention.

First, the power of the television is switched on (S10), the channel is tuned in the power on switching step (S10) (S20), and in the channel tuning step (S20), the voice multiple broadcast channel is tuned to the voice In step S30 of outputting multiple broadcasts, and in the voice multiplexing output step S30, a non-signal is detected from the IF amplifier 120 and applied to the microcomputer 230 to confirm it (S40). After the no signal is confirmed in the non-signal checking step (S40), a malfunction of the voice multi-broadcasting is generated (S50), and the color reproducing unit 280 by the voltage detector 260 in the malfunction generating step (S50). When the voltage generated from the color killer unit 286 is detected and its presence / absence is determined (S60), and if there is no voltage detected in the voltage presence / absence determination step (S60), the microcomputer 230 displays the OSD. Applying an OSD driving control signal to the driving unit (270) (S70) and the control In the signal applying step (S70), the OSD driver 270 receives the OSD drive control signal from the microcomputer 230 and outputs an OSD RGB signal to the color reproduction unit 280, so that a no-signal warning message is displayed on the screen of the television. The step S80 is output, and if the voltage detected in the voltage presence / absence determination step S60 is present, the channel selection is repeatedly performed for outputting a normal voice multicasting operation (S20).

As described above, the present invention occurs when the input signal received through the antenna of the television has no signal, thereby causing malfunction of voice multicasting. When the detected voltage is detected and the detected voltage is determined to be below a predetermined level, the OSD driver is operated so that the OSD screen displaying the no-signal warning message is displayed on the screen of the television so that the viewer can quickly There is an effect to tune the broadcast channel, improving the stability and reliability of the television system.

Claims (3)

A tuner circuit unit 110 for receiving a high frequency signal through an antenna 100, The AM amplifier 120 detects an intermediate frequency amplified IF signal 120 and an intermediate frequency amplified signal from the IF amplifier 120 by applying an AM signal to the composite video signal from the tuner circuit 110. An image detector 130 for extracting a composite signal mixed with an audio signal and a second audio signal; A first filter (200) and a second filter (140) for passing only the first audio signal and the second audio signal, respectively, from the composite signal applied from the image detector (130); First and second voice demodulators 210 and second voices for receiving the first and second FM signals from the first filter 200 and the second filter 140 and extracting the first and second audio signals, respectively. Demodulator 150, A first amplifier 220 and a second amplifier 180 and the second audio demodulator to amplify the voice low frequency signal applied from the first voice demodulator 210 and the second voice demodulator 150, respectively. A recognition signal detection unit 160 for AM detection of the automatic recognition signal included in the 150 and extracting the recognition signal; The first audio signal (L + R signal) and the second audio signal (LR signal) are applied from the first amplifier 220 and the second amplifier 180 to synthesize (add) in phase or reverse phase. A matrix circuit unit 190 which is synthesized (subtracted) to separate the L and R signals, When the signal applied from the recognition signal detector 160 is the first recognition signal, the stereo output applied by the matrix circuit unit 190 passes through, while the signal applied from the recognition signal detector 160 is second. A switch unit 170 for changing a circuit to output the recognition signal without passing through the matrix circuit unit 190; A signal detector 240 for detecting an input signal from the IF amplifier 120 and applying it to the microcomputer 230 and an image amplifier 250 for amplifying the image signal and the luminance signal output from the image detector 130. And an OSD driver 270 which receives an OSD driving control signal from the microcomputer 230 and outputs an OSD RGB signal. A color reproduction unit 280 for generating an original color difference signal from the image signal applied from the image amplifier 250 and applying the same color difference signal to the CRT driver 290, and receiving and processing an OSD RGB signal from the OSD driver 270; A voltage detector 260 for detecting a voltage generated from the color reproduction unit 280 and applying it to the microcomputer 230; No signal multiple voice malfunction warning device through the detection of the color killer voltage consisting of a microcomputer (230) for receiving the voltage detected from the voltage detector 260 to apply the OSD drive control signal to the OSD driver (270). 2. The signalless signal of claim 1, wherein the voltage detector 260 is applied to the microcomputer 230 only when the voltage detected by the color killer 285 is 3.8V or less. Voice multiple malfunction warning device. The color killer voltage of claim 1, wherein the microcomputer 230 applies the OSD driving control signal to the OSD driver 270 only when the voltage applied from the voltage detector 260 is 3.8V or less. Multi-error voice warning device when no signal through.