The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 1999
Filed:
Jul. 02, 1992
Hisashi Suganuma, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
The present invention relates to a prediction filter that estimates the next sampled value from previously sampled values, and which provides an improved prediction filter that makes a prediction with little error, even for an input signal containing a frequency component close to one-half the sampling frequency. Concatenated delay circuits delay sampled values by a sampling time interval (T). Coefficient circuits multiply the outputs of the delay circuits by a certain value, and an adder sums the outputs of the coefficient circuits. Sampled values at time t=T, 0, -T, -2T, . . . are assumed to be y.sub.1, y.sub.0, y.sub.-1, y.sub.2, . . . and a predicted value at t=T to be<y.sub.1 >. These are used to generate new variables<y1>=y.sub.0, y.sub.0 =y.sub.-1, y.sub.-1 =y.sub.-2, . . . The new variables are then substituted into first- and second-degree prediction equations to produce a predicted value<y.sub.1 >, and the coefficient of each term of the equation for<y.sub.1 > is used as the multiplication factor of each coefficient circuit.