Discrete signal processing device and processing method
外国特許コード  F110003346 

整理番号  A22203WO 
掲載日  2011年6月23日 
出願国  アメリカ合衆国 
出願番号  57273705 
公報番号  20080207160 
公報番号  7979480 
出願日  平成17年7月14日(2005.7.14) 
公報発行日  平成20年8月28日(2008.8.28) 
公報発行日  平成23年7月12日(2011.7.12) 
国際出願番号  JP2005013034 
国際公開番号  WO2006011371 
国際出願日  平成17年7月14日(2005.7.14) 
国際公開日  平成18年2月2日(2006.2.2) 
優先権データ 

発明の名称 （英語）  Discrete signal processing device and processing method 
発明の概要（英語） 
(US7979480) A signal processing device and a signal processing method are provided which can reproduce a smooth signal in the reproduction of a discrete signal having a nonuniform sample point interval. The device includes a coefficient calculation unit 4 that inputs a sample point signal E2 representative of the time of a sample point of a discrete signal E1 having a nonuniform sample point interval to obtain a coefficient of a sampling function corresponding to the discrete signal, and a reproduction signal calculation unit 5 that obtains a continuous reproduction signal E3 by calculating and outputting a function value within the sample point interval from the discrete signal and the value of the coefficient outputted by the coefficient calculation unit. 
特許請求の範囲（英語） 
[claim1] 1. A signal processing device, wherein a first signal sampled at sample points of nonuniform intervals and a second signal representative of time or position of the sample points are input to the device; the device obtains a product of a value of a sampling function determined by the second signal and a magnitude of the first signal, the product being obtained for each of the sample points; and the device reproduces a signal within a sample point interval by linearly combining the values of the product obtained for each of the sample points. [claim2] 2. The signal processing device according to claim 1, wherein the sampling function is a polynomial function represented by a continuous quadratic expression in each of 2n number of intervals formed by halving each sample point interval, comprises a quadratic continuous polynomial function differentiable once in the sample point and a middle point of the sample point interval, and has a value of 1 in a reference sample point and a value of zero in other sample points. [claim3] 3. The signal processing device according to claim 1, wherein the second signal is represented by elapse time when the first signal is a time series signals and represented by a coordinate point when the first signal is a signal indicated using a coordinate. [claim4] 4. The signal processing device according to claim 1, wherein the second signal is represented by a time interval or a distance between adjacent sample points. [claim5] 5. A signal processing device comprising: a coefficient calculation unit that receives a second signal representative of time or position of sample points of nonuniform intervals to obtain a coefficient of a sampling function; and a reproduction signal calculation unit that obtains a continuous reproduction signal by calculating and outputting a function value within a sample point interval from a first signal sampled at the sample points and a value of the coefficient outputted by the coefficient calculation unit. [claim6] 6. The signal processing device according to claim 5, wherein the reproduction signal calculation unit applies the value of the coefficient outputted by the coefficient calculation unit to a polynomial function to calculate a value of the sampling function in predetermined time or position within the sample point interval, obtains product of a calculation value as a result of the calculation and a signal value of the first signal, and outputs sum of obtained product values in the predetermined time or position within the sample point interval as a reproduction signal. [claim7] 7. A signal processing device comprising: a coefficient calculation unit that receives a second signal representative of time or positions of sample points of nonuniform intervals to obtain a coefficient of a sampling function; and a reproduction signal calculation unit that performs an inner product operation for obtaining a function value within a sample point interval from a first signal sampled at the above sample points of nonuniform intervals and a value of the sampling function determined from a value of the coefficient outputted by the coefficient calculation unit, and obtains a continuous reproduction signal by linear combination of the function values obtained for each of the sample points. [claim8] 8. A signal processing method of a signal processing device which includes a signal reception unit and a signal calculation unit, comprising the steps of: receiving with the signal reception unit, as inputs, a first signal sampled at sample points of nonuniform intervals and a second signal representative of time or position of the sample points; obtaining with the signal calculation unit product of a value of a sampling function determined by the second signal and a magnitude of the first signal, the product being obtained for each of the sample points; and reproducing with the signal calculation unit a signal within a sample point interval by linear combination of values of the product obtained for each of the sample points. [claim9] 9. The signal processing method according to claim 8, wherein the sampling function is a polynomial function represented by a continuous quadratic expression in each of 2n number of intervals formed by halving each sample point interval, comprises a quadratic continuous polynomial function differentiable once in a sample point and a middle point of a sample point interval, and has a value of 1 in a reference sample point and a value of zero in other sample points. [claim10] 10. The signal processing method according to claim 8, wherein a function value of the sampling function in a middle point of a sample point interval is determined by a predetermined condition. [claim11] 11. The signal processing method according to claim 10, wherein the predetermined condition is indicated by defining the function value of the sampling function in the middle point of the sample point interval so that the function value is symmetrical with respect to a reference sample point. [claim12] 12. The signal processing method according to claim 10, wherein the predetermined condition is indicated by defining the function value of the sampling function in the middle point of the sample point interval so that the function value of the sampling function is approximated to a value of a sampling function having a uniform interval with a minimum error. [claim13] 13. A signal processing method of a signal processing device which includes a coefficient calculation unit and a reproduction signal calculation unit, comprising the steps of: receiving with the coefficient calculation unit, as an input, a second signal representative of time or position of sample points of nonuniform intervals to obtain a coefficient of a sampling function; and obtaining with the reproduction signal calculation unit a continuous reproduction signal by calculating and outputting a function value within a sample point interval from a first signal sampled at the sample points and a value of the coefficient of the sampling function. [claim14] 14. A signal processing method of a signal processing device which includes a coefficient calculation unit and a reproduction signal calculation unit, comprising the steps of: receiving with the coefficient calculation unit, as an input, a second signal representative of time or position of sample points of nonuniform intervals to obtain a coefficient of a sampling function; performing with the reproduction signal calculation unit an inner product operation for obtaining a function value within a sample point interval from a first signal sampled at the sample points of nonuniform intervals and a value of the sampling function determined from a value of the coefficient; and obtaining with the reproduction signal calculation unit a continuous reproduction signal by linear combination of the function values obtained for each of the sample points. [claim15] 15. A signal processing device comprising: a signal propriety judging unit that determines whether or not a first signal obtained by sampling a continuous signal is proper; a sample point measuring unit that, when the first signal is proper, produces a second signal representative of time or position of sample points of the first signal; and a signal reproducing unit that, when the first signal is determined to be proper, obtains a continuous reproduction signal based on the first signal and the second signal, wherein the signal reproducing unit comprises: a coefficient calculation unit that receives the second signal to obtain a coefficient of a sampling function; and a reproduction signal calculation unit that obtains the continuous reproduction signal by calculating and outputting a function value within a sample point interval from the first signal determined to be proper and the value of the coefficient outputted by the coefficient calculation unit. [claim16] 16. The signal processing device according to claim 15, wherein the signal propriety judging unit judges propriety by whether or not, comparing with a first sample value of the first signal, a second sample value of the first signal whose sample point is adjacent to a sample point of the first sample value exceeds a predetermined reference value, and judges that the first signal is improper when it exceeds the reference value. [claim17] 17. The signal processing device according to claim 15, wherein the signal propriety judging unit judges propriety by whether or not, comparing with a first sample value of the first signal, a second sample value of the first signal that is continuous to the first sample value of the first signal exceeds a predetermined reference value, and judges that the first signal is proper when it exceeds the reference value. [claim18] 18. A signal processing method of a signal processing device which includes a signal propriety judging unit, a sample point measuring unit and a signal reproducing unit, comprising: a first step of determining with the signal propriety judging unit whether or not a first signal obtained by sampling a continuous signal is proper; a second step of, when the first signal is proper, producing with the sample point measuring unit a second signal representative of time or position of sample points of the first signal; and a third step of, when the first signal is determined to be proper, obtaining with the signal producing unit a continuous reproduction signal based on the first signal and the second signal, wherein the third step includes: a fourth step of receiving with the signal reproducing unit the second signal to obtain a coefficient of a sampling function; and a fifth step of obtaining with the signal reproducing unit the continuous reproduction signal by calculating and outputting a function value within a sample point interval from the first signal determined to be proper and the value of the coefficient of the sampling function. [claim19] 19. The signal processing method according to claim 18, wherein, in the first step, propriety is judged by whether or not, comparing with a first sample value of the first signal, a second sample value of the first signal whose sample point is adjacent to a sample point of the first sample value exceeds a predetermined reference value, and the first signal is determined to be improper when it exceeds the reference value. [claim20] 20. The signal processing method according to claim 18, wherein, in the first step, propriety is judged by whether or not, comparing with a first sample value of the first signal, a second sample value of the first signal that is continuous to the first sample value of the first signal exceeds a predetermined reference value, and the first signal is determined to be improper when it exceeds the reference value. [claim21] 21. A signal processing method of a signal processing device which includes a reproduction signal calculation unit, comprising the step of: reproducing with the reproduction signal calculation unit a signal value within a sample point interval by using a value of a first signal whose sample points are of nonuniform intervals and a sampling function determined by a second signal representative of time or position of the sample points of the nonuniform intervals. 


国際特許分類(IPC) 

参考情報 （研究プロジェクト等）  CREST New HighPerformance Information Processing Technology Supporting InformationOriented Society  Aiming at the Creation of New HighSpeed, LargeCapacity Computing Technology Based on Quantum Effects, Molecular Functions, Parallel Processing, etc. AREA 
日本語項目の表示
発明の名称  離散信号の信号処理装置及び信号処理方法 

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