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11. 发明专利

JPS62190995A LUMINANCE SIGNAL AND CHROMINANCE SIGNAL SEPARATING DEVICE 失效
公开(公告)号：JPS62190995A
公开(公告)日：1987-08-21
申请号：JP3458986
申请日：1986-02-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NISHIKIORI YOSHIHISA
IPC分类号： H04N9/78
摘要： PURPOSE:To reduce dot disturbance by processing only in fields if vertical and horizontal correlation are lost by providing a mixing circuit which adds two chrominance signals at a variable ratio in correspondence to the output of a correlation deciding circuit. CONSTITUTION:A composite video signal (YL+YH+C) is applied to an input terminal 1 and a high-frequency video signal (YH+C) is filtered by a HPF 3. The 1st high-frequency video signal outputted by the HPF 3 is inputted to 1H.DL4 and 1H.DL5 successively to obtain the 2nd high-frequency video signal and the 3rd high-frequency video signal. The 1st, the 2nd, and the 3rd high-frequency video signals are inputted to a correlation arithmetic circuit to calculate a value (k) indicating the correlation between the 2nd high-frequency video signal and the 1st and the 2nd high-frequency video signals. A subtracter 7 subtracts the 1st high-frequency signal from the 2nd high-frequency video signal to obtain a chrominance signal and a subtracter 8 also obtains a chrominance signal from the 2nd and the 3rd high-frequency video signals. Then, an arithmetic circuit 9 adds the chrominance signals from the subtracters 7 and 8 at a ratio corresponding to the output (k) of the correlation arithmetic circuit 6k and a multiplier 13 multiplies the result by a half, so that the correct chrominance signal is outputted from a terminal 12.

12. 发明专利

JPS62171297A DIGITAL PHASE SYNCHRONIZING SIGNAL GENERATOR 失效
公开(公告)号：JPS62171297A
公开(公告)日：1987-07-28
申请号：JP1257486
申请日：1986-01-23
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NISHIKIORI YOSHIHISA , IDE AKIFUMI
IPC分类号： H04N19/00 , H03L7/06 , H04N11/04
摘要： PURPOSE:To reduce the round-off error due to operation and to generate a phase synchronizing signal with simple constitution by using a conversion table ROM so as to obtain a phase difference theta between a burst signal and a sampling clock from an arithmetic means value of plural sample values of the same phase of the burst signal. CONSTITUTION:A composite video signal inputted from a terminal 1 is sampled by a sampling clock in synchronism with a burst signal generated by a VCO 10 from an A/D converter 2 and inputted to a mean circuit 4 via a BPF 3. The circuit 4 is operated by using a pulse from a timing pulse generation circuit 12, and sample values of the burst signals having a specific phase and means value of different phase and adjacent sample points are obtained. A ROM 5 outputs the mean value of two phases of the burst signal operated by the circuit 4 while converting it into a phase difference theta between the burst signal and the sampling clock, a phase theta' inputted from a terminal 7 by an adder 6 is added to match the phase difference theta to a prescribed phase difference. A VCO 10 changes the oscillation frequency proportional to the phase difference thetato generate the clock in synchronism with the burst signal.

13. 发明专利

JPS6276313A FREQUENCY CHARACTERISTIC CONVERTER FOR DIGITAL FILTER 失效
公开(公告)号：JPS6276313A
公开(公告)日：1987-04-08
申请号：JP21542585
申请日：1985-09-27
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NISHIKIORI YOSHIHISA
IPC分类号： H03H17/00 , H03H17/02
摘要： PURPOSE:To compress or expand optionally a frequency characteristic of a filter by using an interpolation operation circuit and an interpolation coefficient ROM so as to convert a sample clock rate of an input time series signal. CONSTITUTION:The interpolation operation circuit 2 applies interpolation operation to convert a time series data of a sampling clock inputted from a terminal 1 into a time series data of other sampling clock. The coefficient used for the interpolation operation is stored in the interpolation coefficient ROM 6. The new time series data subject to interpolation operation is outputted synchronously with the clock pulse form a clock pulse generation ROM 7. A digital filter 3 applies opeation to the inputted data series to change a crossover frequency in the output from the filter 3 into a desired value. Further, the data series is converted into the original data series by an inverse interpolation operation circuit 4 and outputted form a terminal 5.

14. 发明专利

JPS612488A DEVICE FOR SEPARATING CARRIER CHROMINANCE SIGNAL FROM LUMINANCE SIGNAL 失效
公开(公告)号：JPS612488A
公开(公告)日：1986-01-08
申请号：JP12299384
申请日：1984-06-15
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： IDE AKIFUMI , YAMAMITSU CHIYOUJIYUROU , NISHIKIORI YOSHIHISA
IPC分类号： H04N9/78
摘要： PURPOSE:To prevent a separated signal from deterioration even if the correlation of a picture is reduced by adding a delay unit and two coefficient multiplier to a conventional separating device and also providing the titled device with a detector for detecting the correlation of input signals and a coefficient controller for the coefficient multiplier. CONSTITUTION:The outputs of an 1-H delay unit 3 and a delay unit 28 are multiplied by K1 and K2 times respectively by coefficient multiplier 29, 30. The correlation detector 31 calculates the degree of the correlation of pictures and outputs a signal corresponding to the correlated degree and the coefficient controller 32 controls said factors K1, K2 on the basis of said outputs. In this case, K1=1-K and K2=K (0

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