KR920008997Y1 - Device for controlling power - Google Patents

Abstract

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Description

Power Control Device Using Voice Multiple Channel

1 is a schematic diagram showing a schematic configuration of a transmission system of a power control apparatus according to the present invention.

Figure 2 is a schematic diagram showing a schematic configuration of the receiving system of the power control device according to the present invention.

* Explanation of symbols for main parts of the drawings

10: synchronous signal distributing means 20: synchronous modulating means

30: voice multiple selection means 40: voice multiple modulation means

50: voice multiple separation means 60: mixing means

70: voice multiple control means

The present invention relates to a power control apparatus using a voice multiple channel. In particular, in a voice multiple system such as a television or a video recorder (VCR) using a tuner, a predetermined frequency signal is loaded on the voice multiple channel. A power control device for switching a television power source.

In general, CATV systems are used in homes and businesses because they are multi-channelized, large-scaled, interactive, and high-quality. By adopting the frequency division multiplexing method, the CATV system transmits a lot of information such as voice, video, and data to the subscriber terminal through the broadband transmission line. have.

In the case where the above CATV system is applied to the home, when the viewer is sleeping while watching the television or leaves the house while the television is turned on, the television power is kept on even when the transmission is terminated. In addition, when CATV broadcasting transmitted to a company and a public place is terminated, a problem arises in that a manager is required to directly "power off" an entire television set connected to a transmission cable.

Therefore, in order to solve the above problems, the present invention eliminates the inconvenience of the viewers having to switch the power supply to the TV, and the TV station transmits a specific frequency to the channel with the TV broadcast for a certain time at the end of the broadcast in order to automatically manage the CATV system. SUMMARY OF THE INVENTION An object of the present invention is to provide a power control apparatus using a voice multiple channel that is received by a television of a subscriber terminal and automatically "offs" the television power.

In order to achieve the above object, the present invention, by inputting a composite video signal to separate the synchronous signal of phase synchronization, and divides the synchronous signal with a divider, selects the signal divided by the synchronous signal division means Synchronization modulation means for resynchronizing and modulating the weak signal of the voice multi-channel signal into the preamplifier and amplified and withdrawing the dual terminal while filtering with the low pass filter and filtering the signal filtered by the low pass filter through the matrix A voice multiplexing means for outputting a stereo signal, a signal selected at one output end of the voice multiplexing means and an output signal of the synchronous modulating means to perform IF modulation and an IF modulated signal at the other output end of the audio multiplexing means Consists of voice multiple modulation means for transmitting to pre-collector and modulator to transmit antenna In the transmission system characterized in that the voice IF signal from the tuner to output a dual signal through the band pass filter, limiter, FM detector, low pass filter and the filtered signal from the low pass filter to the matrix to stereo Voice multiple separation means for outputting a signal, mixing means for mixing the AM detection signal and the signal for dividing the phase detection signal selected for each signal by inputting the FM detector output of the voice multiple separation means, dual, stereo signal of the mixing means The first and second voices of the voice multiplexing means are selected through the low pass filter, the full wave rectifying stage, and the control logic stage, and the auto power off signal is connected to the power control signal through the low pass filter, the full wave rectifying stage, and the inverter. And a receiving system comprising voice multiple signal control means for controlling power in combination.

Hereinafter, the configuration and effects of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram showing a schematic configuration of a transmission system of a power control apparatus using a voice multiple channel according to the present invention.

In FIG. 1, when the composite video signal CV is applied to the synchronization signal division means 10, the synchronization signal is separated by the synchronization separation stage 11 in the synchronization signal separation means 10. FIG.

The synchronizing signal output from the synchronizing separation stage 11 is applied to the phase synchronizing loop stage 12 to synchronize the phase of the synchronizing signal at the oscillation frequency of the voltage controlled oscillator 13 to be transmitted to the synchronizing separation stage 11 again. .

The 55KHz synchronization signal transmitted from the phase synchronization loop stage 12 to the synchronization separation stage 11 is input to the divider 14-16. The frequency divider 14 divides the auto power off signal of 336 Hz, the frequency divider 15 divides the dual signal of 276 Hz, and the frequency divider 16 divides the stereo signal of 149.9 Hz.

Signals divided by the dividers 14 to 16 are selectively input to the synchronous modulation means 20. The auto power off signal, the dual signal, and the stereo signal selectively input to the synchronous modulator 20 are input to the AM modulator 23 by synchronizing the phases at the phase synchronous loop stage 21 and the voltage controlled oscillator stage 22. The signal input to the AM modulator 23 is output in a modulated state.

On the other hand, the voice multiple selection means 30 inputs the voice multiple channel (CH1, CH2) signals to amplify the weak signals of CH1 and CH2 in the preamplifiers 35 and 31, respectively, so as to reduce noise mixing or decrease in the SN ratio. In the prevented state, the stereo signal is transmitted from the stereo terminal S through the buffers 36 and 22 and the low pass filters 37 and 33.

The signal selected through the CH2 of the voice multiple selection means 30 and the output signal of the synchronous modulation means 20 are mixed in the mixer 41 and input to the IF modulation stage 44 via the buffer 43. At this time, the interaction between the signal selected through CH2 and the signal output through the AM modulator 23 is selectively connected to the dual terminal (D) or the stereo terminal (S) according to the type of the program currently being broadcast. That is, when the broadcasted program is a foreign movie, the dual-show program is selected in stereo, and the signal selected in the second channel is mixed in the mixer 41 with the output signal from the AM modulator 23. As described above, since the selection means for the linkage operation between the signal selected in the second channel and the signal output from the synchronization modulator 20 according to the type of broadcast program is well known, detailed description thereof will be omitted.

The signal input to the IF modulation stage 44 is IF modulated and input to a pre corrector 48. In addition, the signal selected through CH1 of the voice multiple selection means 30 is modulated by the IF modulation stage 47 via the buffers 45 and 46 and input to the pre-collector 48. The modulation signals of the voice multiple channels CH1 and CH2 input to the pre-collector 48 from the IF modulation stages 47 and 44 are linear signals because the mixed modulation due to nonlinearity is removed from the pre-collector. Outputs The signal passing through the pre-collector 48 is modulated by the modulator 49 and transmitted to the transmission antenna. When the broadcasting ends, the broadcasting station uses voice multiple channels CH1 and CH2 to replace the pilot signal of the dual and stereo signals. The automatic power-off signal of 336 Hz is modulated by 55 KHz by the AM modulator 23 of the synchronous modulation means 20 and loaded on the audio multiple channel CH1 and CH2 signals.

2 is a schematic diagram showing a schematic configuration of a receiving system of a power control apparatus using a voice multiple channel according to the present invention.

2, the band pass filters 51 and 55, the limiters 52 and 56, and the FM detectors 53 and 57 which extract the voice IF signal AI from the tuner and constitute the voice multiple separation means 50. The dual signal is transmitted to the dual terminal D through the low pass filters 54 and 58 and the stereo signal S is filtered through the matrix 59 to the stereo terminal S through the matrix 59. Send a signal.

The output of the FM detector 57 constituting the second voice signal separation stage of the voice multiple separation means 50 is transmitted to the band pass filter 61 constituting the mixing means 60. The signal passing through the band pass filter 61 detects a stereo signal of 149.9 Hz, a dual signal of 276 Hz, and an auto power off signal of 336 Hz from the AM detector 63 and inputs it to the mixers 67, 68, and 69, respectively. At this time, the 55KHz phase signal is divided by the phase detector 64 and the oscillator 65 which oscillates 33.555KHz oscillation frequency through the PI input stage and divided through the divider 66 to divide the signals of 275Hz, 150.5Hz, 335.6Hz. Input to mixers 67, 68, and 69, respectively.

The signal output from the AM detector 63 and the signal divided by the divider 66 are mixed by the mixers 67, 68, and 69, respectively, in the low pass filters 71, 73, and 76. Output 0.4Hz signal. In this way, the signals output from the mixers 67, 68, and 69 are respectively filtered by the low pass filters 71, 73, and 76 of the voice multiple signal control means 70 to output dual signals, stereo signals, and auto power off signals. Output

For example, an output process of 1.0 Hz, 0.6 Hz, and 0.4 Hz, which is selectively output from the low pass filters 71, 73, and 76, for example, a stereo pilot signal (149.9 Hz) is mounted on the sub-channel CH2 of the audio channel. Let's look at the case of sending. The mixer receives the signal from the AM detector 63 and the signal from the divider 66 and mixes them respectively (addition and subtraction processing). Then the signal output from the mixer 67 is

149.9 + 275 = 424.9 Hz

149.9-275 = 125.1 Hz

The signal mixed and output from the mixer 68 is

149.9 + 150.5 = 330.4 Hz

The signal is outputted in the same process in the mixer 69 as 149.9-150.5 = 0.6Hz. The output signal is filtered as it passes through the low pass filters 71, 73, and 76, and only a signal of 0.6 Hz, which is an output signal from the mixer 68, is output. In addition, when a dual signal (276Hz) is supplied instead of a stereo signal, a signal of 551 Hz and 1 Hz is output from the mixer 67, and signals of 426.5 Hz and 121.5 Hz are output from the mixer 68, respectively, and are filtered out. Is a signal of only 1 Hz, which is an output signal from the mixer 67, to be output ("high" state). In the same way, when the automatic power-off signal of 336 Hz is input, only the signal of 0.4 Hz is output. The signal output in this way serves only as a control signal and its value does not have a numerically significant meaning.

The signals output from the low pass filters 71, 73, and 76 are full-wave rectified at the full-wave rectification stages 72, 74, and 77, respectively. The signals output from the full-wave rectification stages 72, 74 are control logic stages 75. The control is performed to select the first and second voice signals of the voice multiple separation means 50. That is, in the control logic stage 75, the selection of the output from the low pass filters 54 and 58 and the output from the matrix 59 in the voice multiple separation means 50 is determined from the mixers 67 and 68. Determined by the output. If the output of the mixer 67 is "H", the control logic stage 75 causes the output switch of the first audio signal (main signal) and the second audio signal (sub-signal) to be located at the D terminal (audio multiple). If the output from the mixer 68 is " H ", the control logic stage 75 causes the output switches of the first and second audio signals to be placed at the S terminal (stereo). In addition, the reason why the stereo broadcast signal is output through the matrix is that since the stereo broadcast transmits the (LR) signal to the main channel (L + R) signal, the L (left) and R must pass through the stereo matrix 59 at the time of reception. Separated by the (right) signal.

The output of the full wave rectifying stage 77 inverts the level to the inverter 78 in the " high " level signal state and transmits it to one input of the AND gate 79.

Therefore, the output signal of the AND gate 79 is transmitted to the power supply terminal OUT in the "low" state to turn off the power supply. At this time, the other input of the AND gate 79 is inputted with a "high" level power control signal (PWR CTL).

As described above, the present invention configures a television power-off device using a voice multiple channel in a television transmission system so that when the broadcast is terminated, the television set receiving the signal is automatically turned off by transmitting a fixed frequency to the television reception system. There is an advantage to this.

Claims (1)

A synchronization signal distributing means (10) for dividing a synchronous signal whose phase is synchronized by inputting a complex video signal, and dividing the synchronous signal by a divider, and selecting the signal divided by the synchronous signal distributing means (10) to resynchronize and modulate A weak signal of the audio multi-channel signal is inputted to the preamplifier and amplified, and the dual terminal is extracted while the low-pass filter is filtered, and the signal filtered by the low-pass filter is stereo via a matrix. Voice multiple selection means 30 for outputting a signal, a signal selected at one output terminal of the voice multiple selection means 30, and an output signal of the synchronous modulation means 20 are subjected to IF modulation and voice multiple selection means 30. A transmission system comprising voice multiple modulation means 40 which IF modulates the signal selected at the other output terminal of the signal and passes it through a precollector and a modulator to a transmitting antenna. The audio multiplexer outputs a dual signal through a band pass filter, a limiter, an FM detector, and a low pass filter by extracting the voice IF signal from the tuner and inputs the signal filtered by the low pass filter into a matrix to output a stereo signal. Mixing means (60) and the mixing means (60) for mixing the AM detection signal and the signal for dividing the phase detection signal selected for each signal by inputting the FM detector output of the separating means (50) and the voice multiplexing means (50). The dual and stereo signals of) are selected through the low pass filter, full wave rectification stage, and control logic stage, so that the first and second voices of the voice multiplexing means 50 are selected, and the auto power off signal is a low pass filter, full wave rectification. However, using a voice multiple channel, characterized in that it consists of a receiving system comprising a voice multiple control means 70 to control in combination with a power supply control signal through an inverter. It won control device.