Accession Number : ADD007166

Title :   Improved Chirp Filters/Signals.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Alsup, James N

Report Date : 09 Apr 1980

Pagination or Media Count : 15

Abstract : A discrete chirp generator produces discrete chirp signals which correspond to either of two exponential functions, namely the functions exp (j pi (m sq + alpha)/N) or exp (j pi (m(m+beta)+alpha)/N), where m equal 0, 1, 2, ..., M. Typically, M and N might both have the value 256. Similarly, a discrete chirp filter is described by it's impulse response which has one of these same two functional forms. These two new components (discrete chirp generator and discrete chirp filter) can be used to implement (a) an improved type of frequency synthesizer, and (b) an improved type of discrete Fourier transformer. In the former, a single generator is used in conjunction with delay, conjugation, multiplication, and low-pass filter components to achieve an improved synthesizer. In the latter, either of the two discrete chirp function generators is combined with an input signal g sub n in a multiplier. (Author)

Descriptors :   *PATENT APPLICATIONS, *CHIRP FILTERS, SIGNAL GENERATORS, EXPONENTIAL FUNCTIONS, FREQUENCY SYNTHESIZERS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE