John J Buss

US Patent:

57269246, Mar 10, 1998

Filed:

Jul 11, 1996

Appl. No.:

8/680282

Inventors:

John Michael Buss - Tempe AZ
James Douglas Dworkin - Chandler AZ
Scott Edward Lloyd - Hoffman Estates IL
ShaoWei Pan - Schaumburg IL
Stephen L. Smith - Chandler AZ

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

G06F 102
G06F 700
G06F 1500
G06F 750

US Classification:

364722

Abstract:

A circuit and method for computing an exponential signal x. sup. g is provided. The circuit includes a logarithm converter which converts an input signal to binary word that represents the logarithm of an input signal x. A first shift register shifts the binary word in a bit-wise fashion to produce a first intermediate value; while a second shift register shifts the binary word in a bit-wise fashion to produce a second intermediate value. The shift registers may be implemented using multiplexers. The shifting operations are equivalent to multiplying the intermediate values by a factor which is a power of two. The first intermediate value is either added to or subtracted from the second intermediate value to produce a combined value. An inverse-logarithm converter converts the combined value to the exponential signal.

US Patent:

62597205, Jul 10, 2001

Filed:

Dec 12, 1996

Appl. No.:

8/764344

Inventors:

John Michael Buss - Tempe AZ
James Douglas Dworkin - Chandler AZ
Stephen Lee Smith - Chandler AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 169

US Classification:

375130

Abstract:

A programmable versatile digital signal processing system architecture (FIG. 5) allows the implementation of functions for transmitting and receiving a variety of narrow and wide-band communication signaling schemes. The flexibility of the architecture (FIG. 5) makes it possible to receive and transmit many different spectral communication signals in real time by implementing signal processing functions such as filtering, spreading, de-spreading, rake filtering, and equalization under the direction of program instructions (FIGS. 13, 14, 15, and 16).

US Patent:

55530125, Sep 3, 1996

Filed:

Mar 10, 1995

Appl. No.:

8/401515

Inventors:

John M. Buss - Tempe AZ
James D. Dworkin - Chandler AZ
Scott E. Lloyd - Hoffman Estates IL
Shao W. Pan - Schaumburg IL
Stephen L. Smith - Chandler AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G06F 102
G06F 700
G06F 1500
H03M 750

US Classification:

364722

Abstract:

A circuit and method for computing an exponential signal x. sup. g is provided. The circuit includes a logarithm converter which converts an input signal to binary word that represents the logarithm of an input signal x. A first shift register shifts the binary word in a bit-wise fashion to produce a first intermediate value; while a second shift register shifts the binary word in a bit-wise fashion to produce a second intermediate value. The shift registers may be implemented using multiplexers. The shifting operations are equivalent to multiplying the intermediate values by a factor which is a power of two. The first intermediate value is either added to or subtracted from the second intermediate value to produce a combined value. An inverse-logarithm converter converts the combined value to the exponential signal.

US Patent:

58527303, Dec 22, 1998

Filed:

Dec 12, 1996

Appl. No.:

8/764429

Inventors:

John Michael Buss - Tempe AZ
James Douglas Dworkin - Chandler AZ
Stephen Lee Smith - Chandler AZ

International Classification:

G06F 940

US Classification:

395588

Abstract:

A programmable versatile digital signal processing system architecture (FIG. 5) allows the implementation of functions for transmitting and receiving a variety of narrow and wide-band communication signaling schemes. The flexibility of the architecture (FIG. 5) makes it possible to receive and transmit many different spectral communication signals in real time by implementing signal processing functions such as filtering, spreading, de-spreading, rake filtering, and equalization under the direction of program instructions (1300, 1400, 1500, 1600).