• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention detects co-channel interference signals from a receiving device of a high-definition television receiver, in particular, a residual sideband reception signal input to a receiving unit of a high-definition television receiver, thereby providing hysteresis with respect to co-channel interference signals to remove or transmit an original signal as it is. The present invention relates to a co-channel interference signal detecting apparatus, and according to the present invention, according to the co-channel interference signal detecting apparatus, after detecting a co-channel interference signal included in the reception unit of a high-definition television receiver, the co-channel interference signal is detected. By setting the comparison value with respect to the hysteresis, it is possible to remove the co-channel interference signal using the comb field unit and to output the same signal or to output the original signal as it is, thereby stabilizing the system and preventing the screen from being broken.
    公开号:KR20000061009A
    申请号:KR1019990009727
    申请日:1999-03-22
    公开日:2000-10-16
    发明作者:박성규
    申请人:김영환；현대전자산업 주식회사；
    IPC主号:
    专利说明:

    Cochannel Interference Signal Detection Device {DEVICE FOR DETECTING CO-CHANNEL INTERFERE NCE}
    [16] The present invention relates to a receiving apparatus of a high definition television receiver. In particular, the same channel interference is detected to detect a co-channel interference signal from a residual sideband reception signal input to a receiving unit of a high-definition television receiver and to transmit or remove the original signal as it is. A signal detection apparatus.
    [17] In general, co-channel refers to a case in which an analog NTSC signal is mixed in a digital residual sideband channel to be received. In this case, when an interference signal increases, the signal to be received cannot be properly received. Receiving performance can be improved by removing the portion where NTSC signal power is concentrated among the received signals, but this should be taken into account because the performance (gain) of about 3dB drops when passing through the comb filter part.
    [18] Thus, the magnitude of the interference signal is measured and used to determine whether it is advantageous to pass the comb filter portion.
    [19] In the conventional high-definition television receiver, the same channel interference signal detector of the internal receiver has a comparison value, and if the same channel signal power exists near the comparison value, even if the same channel signal changes only a little, the remaining sideband receiver mode is changed. There is a problem that the comb filter unit changes from the use mode to the non-use mode from time to time.
    [20] That is, since the comb filter using mode is changed from time to time, an equalizer, a PTL (Phase Tracking Loop), an error correction decoder, and the like mounted on the rear end may be restarted according to the corresponding mode, thereby causing the screen of the television receiver to be broken.
    [21] Accordingly, the present invention is to solve the conventional problems as described above, an object of the present invention is to detect the co-channel interference signal and to compare the comparison value to the hysteresis and then to remove the co-channel interference signal or transmit the original signal as it is The present invention provides a co-channel interference signal detection apparatus.
    [22] In order to achieve the above object, the present invention provides an apparatus for detecting co-channel interference signals, comprising: a first comb filter unit for removing and transmitting co-channel interference signals included in a received signal; A second comb filter unit for generating an ideal synchronization signal in the same pattern as the synchronization signal component included in the received signal; A first subtractor configured to receive a received signal that has not passed through the first and second comb filter units and an ideal synchronization signal and subtract the received signal to obtain an error; A first absolute value calculator calculating an absolute value from an error value output through the first subtractor; A first accumulator for accumulating an absolute value output through the first absolute value calculator and transmitting an average value; A second subtractor configured to receive a synchronization signal of the received signal transmitted through the first and second comb filter units and an ideal synchronization signal and subtract the ideal synchronization signal to obtain an error; A second absolute value calculator calculating an absolute value from an error value output through the second subtractor; A second accumulator for accumulating an absolute value output through the second absolute value calculator and transmitting an average value; A constant value calculator for multiplying a constant value so as to normalize the average value transmitted from the second accumulator to be equally compared with the average value transmitted from the first accumulator; A third subtractor configured to receive and subtract the value of the signal magnitude output from the first accumulator and the constant value calculator; A first comparing unit which receives the subtracted value output from the third subtracting unit and compares it with an upper comparison value; A second comparing unit which receives the subtracted value output from the third subtracting unit and compares it with a lower comparison value; A first counter unit which receives a signal output from the first comparator and counters whether a signal having the same value is continuously input by a set number; A second counter unit which receives a signal output from the second comparison unit and counters whether a signal having the same value is continuously input by a set number; A third counter unit for counting whether a signal output from the first and second counter units is an upper signal or a lower signal and outputting a counted coefficient; A third comparison unit which receives the coefficient output from the third counter unit and compares it with a final comparison value and outputs a comparison signal; And a multiplexer configured to selectively receive the received signal output through the first comb filter unit and the received signal that does not pass through the first comb filter unit, and then selectively output the received signal by the comparison signal output from the third comparator. It is characterized by.
    [1] 1 is a block diagram illustrating an apparatus for detecting co-channel interference signals according to an embodiment of the present invention;
    [2] FIG. 2A is a diagram illustrating positions of an image carrier, a color subcarrier, and an audio carrier having the strongest signal strength among NTSC signals in the co-channel interference signal detecting apparatus according to an embodiment of the present invention; FIG.
    [3] 2b is a view showing the frequency characteristics of the comb filter unit in the co-channel interference signal detection apparatus according to an embodiment of the present invention,
    [4] 2 c is a diagram illustrating a spectrum of a digital residual sideband signal in an apparatus for detecting co-channel interference signals according to an embodiment of the present invention;
    [5] Figure 2d is an enlarged view of the carrier and the end in Figure 2c.
    [6] <Description of the code | symbol about the principal part of drawing>
    [7] 100: first comb filter portion 200: second comb filter portion
    [8] 300: first subtractor 400: first absolute value calculator
    [9] 500: first accumulator 600: second subtractor
    [10] 700: second absolute value calculator 800: second accumulator
    [11] 900: constant value calculation unit 1000: third subtraction unit
    [12] 1100: first comparator 1200: second comparator
    [13] 1300: first counter part 1400: second counter part
    [14] 1500: third counter part 1600: third comparison part
    [15] 1700: multiplexer
    [23] Hereinafter, an apparatus for detecting co-channel interference signals according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
    [24] FIG. 1 is a block diagram illustrating an apparatus for detecting a co-channel signal. FIG. 2A is a diagram illustrating positions of an image carrier, a color subcarrier, and an audio carrier having the strongest signal strength among NTSC signals. FIG. 2B is a frequency of a comb filter unit. Figure 2c is a view showing the characteristics, Figure 2c is a view showing the spectrum of the digital residual sideband signal, Figure 2d is a view showing an enlarged carrier and the end in Figure 2c.
    [25] As shown in FIG. 1, the first comb filter unit 100 removes and transmits a co-channel interference signal included in a received signal input to a high-definition television receiver. In addition, the second comb filter unit 200 serves to make an ideal sync signal in the same pattern as the sync signal component included in the received signal.
    [26] In addition, the first subtractor 300 receives input signals and ideal synchronization signals that do not pass through the first and second comb filters 100 and 200 and subtracts them to obtain an error. The absolute value calculator 400 calculates an absolute value from the error value output through the first subtractor 300.
    [27] Subsequently, the first accumulator 500 accumulates the absolute value output through the first absolute value calculator 400 and transmits the average value. The second subtractor 600 includes the first and the second values. It receives the synchronization signal and the ideal synchronization signal of the received signal transmitted through the two comb filter unit (100, 200) serves to subtract to find the error.
    [28] Meanwhile, the second absolute value calculator 700 calculates an absolute value from the error value output through the second subtractor 600, and the second accumulator 800 stores the second absolute value calculator 700. A cumulative absolute value outputted through) serves to transmit an average value, and the constant value calculator 900 transmits the average value transmitted from the second accumulator 800 to the first accumulator 500. Multiplies constant values to normalize them so that they can be compared equally with the average.
    [29] In addition, the third subtractor 1000 receives and subtracts the value of the signal magnitude output from the first accumulator 500 and the constant value calculator 900, and the first comparator 1100 The subtractor 1000 receives the subtracted value output from the third subtractor 1000, and compares the subtracted value output from the third subtractor 1000. And compares it with the lower comparison value.
    [30] Subsequently, the first counter unit 1300 receives a signal output from the first comparator 1100 and counters whether a signal having the same value is continuously input by a set number, and the second counter unit 1400. ) Receives a signal output from the second comparator 1200 and counters whether a signal having the same value is continuously inputted by a set number, and a third counter 1500 receives the first and second signals. It counts whether the signal output from the counters 1300 and 1400 is an upper signal or a lower signal to output a counted coefficient.
    [31] Meanwhile, the third comparator 1600 receives a coefficient output from the third counter 1500 and compares it with a final comparison value, and outputs a comparison signal. In the multiplexer 1700, the first comparator is used. After receiving the received signal output through the comb filter and the first signal does not pass through the comb filter unit serves to selectively output the received signal by the comparison signal output from the third comparison unit.
    [32] Hereinafter, the operation of the co-channel signal detection device configured as described above is as follows.
    [33] When the residual sideband signal received at the receiver of a high definition television receiver (HDTV) (not shown) is received by the first comb filter unit 100 and the co-channel interference signal included in the received signal is removed and outputted, In addition, the second comb filter unit 200 makes the ideal synchronization signal stored in the memory unit, not shown, in the same pattern as the synchronization signal component included in the received signal.
    [34] In this case, the first subtractor 300 receives a received signal that has not passed through the first and second comb filter units 100 and 200 and an ideal sync signal to obtain an error from the sync signal included in the received signal. After subtracting the ideal synchronization signal and outputting a subtracted value, the absolute value is calculated from the subtracted value output from the first subtractor 300 through the first subtractor 300, that is, the error value, and the first accumulator is obtained. In step 500, the absolute value outputted from the first absolute value calculator 400 is accumulated, and the average value is calculated and transmitted.
    [35] In addition, the second subtraction unit 600 receives the synchronization signal and the ideal synchronization signal included in the reception signal transmitted through the first and second comb filter units 100 and 200 to receive the received signal to obtain an error. Subtract the ideal sync signal from the included sync signal and output the subtracted value.
    [36] Then, the second absolute value calculator 700 obtains an absolute value from the subtracted value output from the second subtractor 600, that is, an error value, and the second accumulator 800 determines the second absolute value calculator ( When the absolute value outputted from 700 is accumulated and the average value is calculated and transmitted, the constant value calculator 900 transmits the average value transmitted from the second accumulator 800 to the first accumulator 500. Multiply arbitrary constants to standardize to compare them evenly with the average.
    [37] Subsequently, the third subtractor 1000 receives a signal value of the signal magnitude output from the first accumulator 500 and the constant value calculator 900 and outputs the value from the first accumulator 500. When the subtracted value is output by subtracting the value output from the constant value calculator 900, the first comparator 1100 receives the subtracted value output from the third subtractor 1000 and is preset. After comparing with the upper comparison value, the corresponding signal is output.
    [38] In addition, the second comparator 1200 receives the subtracted value output from the third subtractor 1000 in the same way as the first comparator 1100 and compares it with a preset lower comparison value. Output the corresponding signal.
    [39] At this time, if the subtracted value output from the third subtractor 1000 from the first comparator 1100 is greater than the upper comparable value, the first counter 1300 to the first comparator 1100. Counts and outputs the upper signal output from the first counter unit 1300 by counting a predetermined counting coefficient, and outputs the upper signal after counting the signal output from the first counter unit 1300. give.
    [40] Then, the third comparison unit 1600 receives an upper signal output from the third counter unit 1500 and compares it with a preset final comparison value to output a comparison signal corresponding to the upper signal, and the multiplexer In operation 1700, the first comb filter unit is received by the comparison signal output from the third comparator 1600 after receiving the reception signal output through the first comb filter unit 100 and the reception signal that does not pass. The received signal output through 100 is output to an equalizer (not shown) and an error correction decoder at a later stage.
    [41] On the other hand, if the subtracted value input from the third subtractor 1000 in the first comparator 1100 is greater than the upper comparison value, the second comparator 1200 inputs from the third subtractor 1000. The subtracted value is compared with the lower comparison value, and a signal corresponding thereto, for example, a low signal is output, and thus the multiplexer 1700 selectively outputs a signal later by the signal output from the third comparator. Does not give.
    [42] In addition, when the value compared by the second comparison unit 1200 is smaller than the lower comparison value, the second counter unit 1400 receives a lower signal output from the second comparison unit 1200 and is set in advance. Counting and outputting a counting coefficient, the counting signal output from the second counter unit 1400 is counted by the third counter unit 1500, and counts and outputs a lower signal.
    [43] Then, the third comparison unit 1600 receives the lower signal output from the third counter unit 1500 and compares it with a preset final comparison value and outputs a comparison signal corresponding to the lower signal. The multiplexer 1700 receives a comparison signal output from the third comparator 1600 and outputs a received signal output through the first comb filter unit 100 to an equalizer, an error correction decoder, and the like. .
    [44] In addition, if the counting value output from the third counter unit 1500 by the third comparison unit 1600 is not more than the upper comparison value or the lower comparison value, the third comparison unit 1600 operates in the previous detection mode.
    [45] As described above, in the present invention, the same-channel signal detection apparatus detects the co-channel interference signal included when a signal is received by a receiver of a high-definition television set, and then sets a comparison value for the co-channel interference signal in hysteresis. By determining whether to output after removing the co-channel interference signal or output the original signal using the unit, the system is stabilized to prevent the screen from being broken.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] A first comb filter unit removing and transmitting the same channel interference signal included in the received signal; A second comb filter unit for filtering an ideal synchronization signal to form the same pattern as the synchronization signal included in the received signal; A first subtractor configured to receive a received signal that has not passed through the first and second comb filter units and an ideal synchronization signal and subtract the received signal to obtain an error; A first absolute value calculator calculating an absolute value from an error value output through the first subtractor; A first accumulator for accumulating an absolute value output through the first absolute value calculator and transmitting an average value; A second subtractor configured to receive a synchronization signal of the received signal transmitted through the first and second comb filter units and an ideal synchronization signal and subtract the ideal synchronization signal to obtain an error; A second absolute value calculator calculating an absolute value from an error value output through the second subtractor; A second accumulator for accumulating an absolute value output through the second absolute value calculator and transmitting an average value; A constant value calculator for multiplying a constant value so as to normalize the average value transmitted from the second accumulator to be equally compared with the average value transmitted from the first accumulator; A third subtractor configured to receive and subtract the value of the signal magnitude output from the first accumulator and the constant value calculator; A first comparing unit which receives the subtracted value output from the third subtracting unit and compares it with an upper comparison value; A second comparing unit which receives the subtracted value output from the third subtracting unit and compares it with a lower comparison value; A first counter unit which receives a signal output from the first comparator and counters whether a signal having the same value is continuously input by a set number; A second counter unit which receives a signal output from the second comparison unit and counters whether a signal having the same value is continuously input by a set number; A third counter unit for counting whether a signal output from the first and second counter units is an upper signal or a lower signal and outputting a counted coefficient; A third comparison unit which receives the coefficient output from the third counter unit and compares it with a final comparison value and outputs a comparison signal; And a multiplexer configured to selectively receive the received signal output through the first comb filter unit and the received signal that does not pass through the first comb filter unit, and then selectively output the received signal by the comparison signal output from the third comparator. On-channel signal detection apparatus, characterized in that.
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    同族专利:
    公开号 | 公开日
    KR100551161B1|2006-02-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-03-22|Application filed by 김영환, 현대전자산업 주식회사
    1999-03-22|Priority to KR1019990009727A
    2000-10-16|Publication of KR20000061009A
    2006-02-13|Application granted
    2006-02-13|Publication of KR100551161B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019990009727A|KR100551161B1|1999-03-22|1999-03-22|Device for detecting co-channel interfere nce|
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