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:
Nov. 29, 1994
Filed:
Jul. 23, 1992
Tatsushi Iizuka, Tokyo, JP;
Satoshi Shinohara, Tokyo, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A system for controlling the pitch between an original sound and a reproduced sound system in which generation of tremolo sound is suppressed and a clock is used commonly for write timing and read timing of a ring buffer. Digital data are obtained by sampling an analog input signal and data are interpolated before writing to a memory of the ring buffer, and a plurality of write positions are provided and the data is written while controlling addresses. Address spacings between a plurality of read memory positions are different from each other. Coefficients are set within a range from a predetermined negative value to a predetermined positive values according to address spacing to write memory position for each of the read memory positions, and the data read from each of a plurality of read memory positions are multiplied by the corresponding coefficient. The resultant data values are summed up and are used as output data. Further, a comb line filter is provided in a signal path.