Randall C Bright

US Patent:

8204158, Jun 19, 2012

Filed:

May 12, 2004

Appl. No.:

10/844156

Inventors:

Randall Glenn Bright - Pittsboro NC, US

Assignee:

Telefonaktiebolaget LM Ericsson (publ) - Stockholm

International Classification:

H04L 27/06

US Classification:

375340, 375147, 375271, 375320, 375322

Abstract:

A transmit circuit reduces undesired amplitude modulation (AM) in transmit signal pulses by substituting predetermined amplitude information for actual pulse amplitude information during portions of the pulse corresponding to nominally constant amplitudes. For example, GMSK and certain other modulation formats use a desired transmit pulse shape that includes a nominally flat middle portion. An exemplary AM reduction circuit detects generated pulse values corresponding to the nominally constant-amplitude portions of the transmit pulse and substitutes predetermined, preferably constant, amplitude values in their place. As such, the circuit may include a comparator used to detect the pulse values corresponding to variable amplitude portions of the pulse, which it passes through, and to detect those amplitude values corresponding to constant-amplitude portions of the pulse, which it replaces with substituted values. Such operation may include amplitude value filtering, and such operations may be modal, e. g. , performed in dependence on modulation mode, etc.

US Patent:

55418627, Jul 30, 1996

Filed:

Apr 28, 1994

Appl. No.:

8/234854

Inventors:

Randall G. Bright - Pittsboro NC
Peter H. Jansen - Durham NC
Vijay K. Nagaraj - Cary NC

Assignee:

Wandel & Goltermann ATE Systems Ltd. - Morrisville NC

International Classification:

G06F 9455
G06G 748

US Classification:

364580

Abstract:

In order to test the functional and parametric characteristics of a unit without overloading a host computer, the host computer downloads a testing program to a plurality of digital signal processor modules which do all of the functional environmental emulation data generation and analysis of the data received from the unit under test. A reconfigurable application interface module is also programmed at the same time as the digital signal processor modules and is thus configured to accept basic emulation data generated by the digital signal processor modules and convert those data to the data environment that the unit under test is expected to experience in use. The application interface module also converts the data received from the unit under test into a format that the digital signal processor modules can analyze, the results of which analysis are made available to the host computer.