Johann J Heinzl

US Patent:

6512803, Jan 28, 2003

Filed:

Mar 9, 2001

Appl. No.:

09/802484

Inventors:

Johann Heinzl - Los Gatos CA
Gary Jacobsen - San Jose CA
Jining Yang - Sunnyvale CA
Kishan Shenoi - Saratoga CA

Assignee:

Symmetricom, Inc. - San Jose CA

International Classification:

H04B 110

US Classification:

375350, 455 63, 455227, 4552781, 455296, 455307

Abstract:

Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental frequencies: computing a set of band pass filter coefficients; sending the set of band pass filter coefficients to a digital filter; repeatedly transforming an analog-to-digital converter output having a quantization level in excess of 2 bits into a band pass filter output with the digital filter to obtain a plurality of samples; computing an average of the plurality of samples; and comparing the average to a threshold to detect peaks that exceed a threshold. An apparatus, comprising: an analog radio frequency circuit; an analog-to-digital converter coupled to the analog radio frequency circuit, the analog-to-digital converter providing a quantization level in excess of 2 bits; a digital filter coupled to the analog-to-digital converter; and a digital circuit coupled to the digital filter.

US Patent:

6842498, Jan 11, 2005

Filed:

Nov 14, 2002

Appl. No.:

10/294227

Inventors:

Johann Heinzl - Los Altos CA, US
Gary Jacobsen - San Jose CA, US
Jining Yang - Sunnyvale CA, US
Kishan Shenoi - Saratoga CA, US

Assignee:

Symmetricom, Inc. - San Jose CA

International Classification:

H04B 110

US Classification:

375350, 455 63, 455227, 4552781, 455307

Abstract:

Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental frequencies: computing a set of band pass filter coefficients; sending the set of band pass filter coefficients to a digital filter; repeatedly transforming an analog-to-digital converter output having a quantization level in excess of 2 bits into a band pass filter output with the digital filter to obtain a plurality of samples; computing an average of the plurality of samples; and comparing the average to a threshold to detect peaks that exceed a threshold. An apparatus includes: an analog radio frequency circuit; an analog-to-digital converter coupled to the analog radio frequency circuit, the analog-to-digital converter providing a quantization level in excess of 2 bits; a digital filter coupled to the analog-to-digital converter; and a digital circuit coupled to the digital filter.

US Patent:

41059956, Aug 8, 1978

Filed:

Jun 16, 1976

Appl. No.:

5/697071

Inventors:

Delwin L. Bothof - Cupertino CA
Richard G. Fowles - San Jose CA
Johann J. Heinzl - Cupertino CA
David R. Novotny - San Jose CA
Robert L. Weisickle - San Jose CA
John H. Wetzel - Santa Clara CA
Paul G. Winninghoff - Sunnyvale CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G08C 2500
G06F 1100

US Classification:

3401461E

Abstract:

A portable microprocessor controlled transmission impairment measuring unit capable of operating as a master unit or a slave unit and responsive to digital or manual control measures all basic parameters necessary to characterize a voice channel for its ability to transmit data traffic, as defined by Bell System Technical Reference PUB41009, dated May 1975. Measurements can be made manually end-to-end with a unit at each end of a circuit to be tested; manually looped-back with a unit at one end of the circuit; or remotely from one end with a MASTER operated unit controlling a SLAVE operated unit with all measurements displayed on the MASTER unit. The unit can also be used as a voice frequency repeater and can be operated with other test sets and computers having compatible measurements and capabilities. All measurements are displayed on digital readouts. Two separate readouts allow simultaneous display of up to two different parameters.