John Schwaller: Adaptive distribution system for transmitting wideband video data over narrowband multichannel wireless communication system. December 17, 1996: US05585850 (139 worldwide citation)

A technique for transmitting wideband signals such as video signals over a communication system such as a cellular or Personal Communication System (PCS) which only has narrowband channels. The video signal is first digitized and compressed, and then forwarded to a commutating switch, together with ...

J William Whikehart: Digital quadrature radio receiver with two-step processing. Ford Motor Company, Mark Mollon, Roger L May, June 22, 1993: US05222144 (132 worldwide citation)

A digital signal processing (DSP) radio receiver employs a conventional analog RF tuner to produce an analog intermediate frequency. The receiver performs DSP functions of digitally sampling the analog intermediate frequency at a sampling rate f.sub.s, concurrently mixing, filtering, and sample-rate ...

Masao Kasuga: Sampling frequency converter. Victor Company of Japan, Ladas & Parry, September 18, 1984: US04472785 (132 worldwide citation)

A sampling frequency converter for converting a first signal sampled at a first sampling frequency f1 into a second signal sampled at a second sampling frequency f2 comprising an interpolation device supplied with the first signal, for inserting L-1 zeros (L is an integer) for every sampling time, a ...

William H Righter, John J Fallin: Wrist worn heart rate monitor. Stoel Rives Boley Jones & Grey, July 3, 1990: US04938228 (128 worldwide citation)

A wrist worn heart rate monitor (100) senses a noisy biosignal with one sensor (104A) in contact with the user's finger and another sensor (104B) in contact with the user's wrist. The sensed signal is modified by a filter (112), analog to digital converter (116) and digital filter (264). A correlato ...

Philippe L Jacob, Sharbel E Noujaim, Glenn A Forman, John A Mallick: Subsampling time-domain digital filter using sparsely clocked output latch. General Electric Company, Allen L Limberg, James C Davis Jr, Marvin Snyder, January 1, 1991: US04982353 (124 worldwide citation)

The plural-phase clocking signal used in a subsampling time-domain digital filter is partially blanked to generate a sparse clocking signal for a clocked data latch that decimates the output signal from the digital filter, to supply it at a subsampling rate as compared to the sampling rate of input ...

William J Owen, Robert A Booker: Optimum second order digital filter. Martin Marietta Corporation, Sughrue Mion Zinn Macpeak & Seas, October 26, 1982: US04356558 (121 worldwide citation)

A second order digital filter utilizing six processor operations, two add instructions, two shift instructions and two store instructions. No multipliers are required. The filter is used as a digital filter in a servo loop having a Z transform of, G(Z)=4 (1-Z.sup.-1)+Z.sup.-2.

Mark A Webster, James C Richards: Least-mean squares adaptive digital filter havings variable size loop bandwidth. Harris Corporation, Charles E Wands, February 14, 1995: US05390364 (120 worldwide citation)

An adaptive digital filter uses a weight adjustment unit for adjusting the weights of an adaptive digital filter according to one or more input signals to the digital filter and according to an error signal indicative of the difference between the actual and desired outputs of the digital filter. Th ...

Bruce D Signore, Eric J Swanson: Analog-to-digital converter with a continuously calibrated voltage reference. Crystal Semiconductor, Gregory M Howison, June 7, 1994: US05319370 (114 worldwide citation)

A method and apparatus for calibration of errors in the analog reference voltage input of an analog-to-digital converter. A monolithic reference voltage generator is provided to generate the analog reference which includes a bandgap voltage reference (50) that outputs an untrimmed voltage and a temp ...

Paul F Stetson: Selection of preset filter parameters based on signal quality. NellcorPuritan Bennett Incorporated, Fletcher Yoder, March 21, 2006: US07016715 (111 worldwide citation)

Methods and devices for reducing noise effects in a system for measuring a physiological parameter, including receiving an input signal; obtaining an assessment of the signal quality of the input signal; selecting coefficients for a digital filter using the assessment of signal quality; and filterin ...

Robert Richard Leyendecker: Frequency selective predistortion in a linear transmitter. Glenayre Electronics, Christensen O Connor Johnson & Kindness PLLC, February 2, 1999: US05867065 (110 worldwide citation)

A system for linearly transmitting an amplified output signal using predistortion is disclosed. The system uses a straight inverse modeling scheme to more easily and accurately determine the inverse of the distortion caused by a power amplifier of a RF transmitter. The direct inverse modeling scheme ...

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