Steen A Parl, Julian Bussgang, Jay Weitzen, James M Zagami: Position location system and method. Signatron Technology Corporation, Hamilton Brook Smith & Reynolds P C, March 16, 1999: US05883598 (109 worldwide citation)

A position location system includes multiple base stations spaced over a region. A portable unit within the region transmits a locating signal which is received by the base stations. The base stations report amplitude, phase and time data related to the locating signal to a control station. The cont ...

Phillip A Bello, Howard C Salwen: Communication system for eliminating time delay effects when used in a multipath transmission medium. Signatron, Roberts Cushman & Grover, September 5, 1972: US3689841 (104 worldwide citation)

A communication system for providing effective multipath transmission without intermodulation or other distortion effects normally arising from the transmission through a dispersive medium, such as multipath troposcatter communication links. In the invention the analog information is used to phase o ...

Bussgang Julian J, Gish Herbert: Signal processing system. Signatron, O Connell Robert F, September 30, 1975: US3909721 (101 worldwide citation)

A signal processing system for processing an analog signal which has been quantized by suitable sampling techniques, different portions of the quantized data information having different significances. The processing is accomplished so as to improve the overall error characteristics of the system wh ...

Monsen Peter: High speed digital communication receiver. Signatron, Dike Bronstein Roberts Cushman & Pfund, April 22, 1975: US3879664 (96 worldwide citation)

A high speed digital communications receiver is used in a diversity receiver system in which the predetection combiner of the receiver utilizes a forward adaptive filter equalizer, having a plurality of weighting sections, in each of the diversity channels for processing each of the received bandpas ...

Peter Monsen: Fast adapting fading channel equalizer. Signatron, Robert F O Connell, May 4, 1982: US04328585 (80 worldwide citation)

A receiver system for processing diversity channel signals to substantially eliminate future and past intersymbol interference (ISI) in received signals which have been transmitted through a time-varying frequency selective transmission medium. The system includes lattice filter means which provide ...

Peter Monsen: Adaptive filter equalizer systems. Signatron, Robert F O Connell, March 22, 1988: US04733402 (73 worldwide citation)

An adaptive filter (11) for use in a diversity receiver system (10) which includes circuitry (23, 24, 25, 26, 34) for determining the strongest received diversity signal or group of signals at each of a plurality of time delays or group of time delays and circuitry (27, 28, 29, 30, 31, 34) for calcu ...

James M Kates: Speech intelligibility enhancement. Signatron, Robert F O Connell, June 12, 1984: US04454609 (66 worldwide citation)

In a communications system, consonant high frequency sounds are enhanced: the greater the high frequency content relative to the low, the more such high frequency content is boosted.

Kates James M: Speech intelligibility enhancement system and method.. Signatron, April 13, 1983: EP0076687-A1 (63 worldwide citation)

To enhance the intelligibility of speech, the consonant sounds are intensified and, in effect, their intensity equalised to that of the vowel sounds in a speech waveform. A short-time estimate of the relative spectral shape of an input speech signal is determined by envelope detectors (24) operating ...

Shou Y Mui: Modem for use in multipath communication systems. Signatron, Robert F O Connell, September 15, 1987: US04694467 (60 worldwide citation)

A modem in which the transmitter uses spectrum spreading techniques applied to sequentially supplied input bits, a first group thereof having one spread spectrum sequence characteristic and a second group thereof having a different spread spectrum sequence characteristic, the spread spectrum bits be ...

Steen A Parl, John N Pierce: Spread spectrum adaptive antenna interference canceller. Signatron, Robert F O Connell, June 2, 1987: US04670885 (55 worldwide citation)

An adaptive power equalizer circuit for use in a spread spectrum receiver system which includes an antenna system 12, 13 and a receiver 11, the circuit comprising adaptive power inversion circuitry 15 for producing a first signal having a minimized power level and a second signal having a substantia ...