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. 26, 1977
Filed:
Sep. 24, 1975
Ronald Eldon Crochiere, Chatham, NJ (US);
Lawrence Richard Rabiner, Berkeley Heights, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A general purpose interpolator-decimator circuit for increasing or decreasing the sampling rate of a digital signal by a factor L/M, where L and M are integers, is disclosed. The circuit includes means for determining each output sample by multiplying a sequence of previous input samples by a set of coefficients and accumulating the resulting products. L sets of coefficients, in which each coefficient is a function of the factors L and M, are stored in a specific sequence which permits sequential addressing of both the coefficients and input signal samples. A multistage decimator cascaded with a multistage interpolator to effect a narrow-band FIR filter is also disclosed.