Brady M Warner

US Patent:

41996607, Apr 22, 1980

Filed:

Nov 7, 1977

Appl. No.:

5/849584

Inventors:

George D. Dill - Gaithersburg MD
Atsushi Tomozawa - Komae, JP
James R. Fillion - Indialantic FL
Mian Z. Ali - Gaithersburg MD
Clyde E. Burwell - Gaithersburg MD
Brady H. Warner - Gaithersburg MD
Richard W. Jones - Frederick MD

Assignee:

Communications Satellite Corporation - Washington DC

International Classification:

H04J 100

US Classification:

370 50

Abstract:

A FDM/TDM transmultiplexer uses sampling rate multiplication to increase the sampling rate for time division multiplexed (TDM) to frequency division multiplexed (FDM) conversion and decrease the sampling rate for FDM to TDM conversion. The rate multiplication filters are realized digitally in order to exploit the computational advantage of Fast Fourier Transform (FFT) algorithm, and channel filtering is implemented by a single time-shared sixth-order elliptic digital recursive filter. A novel FFT processor and recursive filter are disclosed which may be used in the system.

US Patent:

43193528, Mar 9, 1982

Filed:

Sep 27, 1979

Appl. No.:

6/079602

Inventors:

Shanti S. Gupta - Gaithersburg MD
Brady Warner - Santa Maria CA
Joseph H. Deal - Clarksburg MD

Assignee:

Communications Satellite Corporation - Washington DC

International Classification:

H04J 316

US Classification:

370104

Abstract:

A plurality of terrestrial interface modules (TIMs) are multiplexed and demultiplexed with common equipment through the use of mapping RAMs contained in each TIM. The common equipment provides identical addresses to each of the mapping RAMs in the TIMs. The mapping RAMs in each TIM determine whether incoming or outgoing data is to be written into or read from the associated TIM, and generate an address for the data so written into or read from the TIM. A mapping RAM is further provided in the common equipment to allow for burst-to-burst selection of data.