21
Robert Richard Leyendecker: Frequency selective predistortion in a linear transmitter. Glenayre Electronics, Christensen O Connor Johnson & Kindness PLLC, February 2, 1999: US05867065 (114 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 ...


22
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 ...


23
Stephen M Keating: Image signal processing with digital filtering to minimize aliasing caused by image manipulation. Sony Broadcast & Communications, Alvin Sinderbrand, William S Frommer, April 27, 1993: US05206919 (109 worldwide citation)

An image signal processing apparatus has an address generator that generates addresses for successive words of a digital input signal representing an input image to be manipulated. A computation circuit monitors the addresses for successive word sets which each comprise first and second words relati ...


24
Thomas Ying Ching Lo, Yuh Show Tsai: EKG based heart rate monitor with digital filter and enhancement signal processor. Salutron, Townsend and Townsend and Crew, March 2, 1999: US05876350 (107 worldwide citation)

A convenient low-cost heart rate monitor. In one embodiment, a digital filter structure includes a low pass filter having a notch at 60 Hz and a bandpass filter which amplifies signals in a frequency range from 10-40 Hz and has a notch at 60 Hz. This digital filter has a recursive structure and uses ...


25
Sunao Takatori, Makoto Yamamoto: Filter circuit with switchable finite impulse response and infinite impulse response filter characteristics. Yozan, Cushman Drby & Cushman, February 7, 1995: US05388063 (107 worldwide citation)

A filter which can operate as a digital filter of the finite impulse response type or the infinite impulse response type using one circuit. The signal to be filtered is multiplied and added using a first calculation circuit and a second calculation circuit. The outputs of the calculation circuits ar ...


26
Ritchie James Kenneth Alexande, Abbott David, Anderson Adrian, Parris Clifford: Method and apparatus for signal processing.. Texas Instruments, November 11, 1992: EP0512748-A2 (105 worldwide citation)

A digital demodulator for a NICAM 728 system signal has sampling and digitizing means converting the signal into a succession of digital samples. The digital samples pass through an anti-aliasing digital comb filter to a selector (decimator) that selects one sample in three and feeds it to a second ...


27
Mehdi Hatamian: Efficient fir filter for high-speed communication. Broadcom Corporation, Christie Parker & Hale, August 7, 2001: US06272173 (105 worldwide citation)

A method for reducing a propagation delay of a digital filter. The digital filter has an input path and an output path and includes a set of delay elements and a number of taps. The taps couples the input path to the output path. Each of the taps includes a coefficient, a multiplier and an adder. Ea ...


28
Malcolm J Williamson, Diane K Bustamante: Feedback suppression in digital signal processing hearing aids. Wisconsin Alumni Research Foundation, Foley & Lardner, February 25, 1992: US05091952 (102 worldwide citation)

Acoustic feedback in digital signal processing hearing aids is suppressed by using signal processing techniques in the digital processor. A first processing technique causes the data to the main signal processing path in the digital signal processor to be delayed by varying amounts over time, prefer ...


29
Charles L Saxe, Roydn Jones: Anti-aliasing filter circuit for oscilloscopes. Tektronix, John P Dellett, November 4, 1986: US04621217 (102 worldwide citation)

A digital storage oscilloscope is provided with an anti-aliasing filter circuit utilizing a first plurality of switchable analog filters that bandwidth limit frequencies greater than half the oscilloscope's sampling frequency, and a digital transversal filter effective at lower sweep rates and sampl ...


30
Donald W Becker, Thomas R Bilotta: Digital receiver for variable data rate communications. TV COM Technologies, Baker Maxham Jester & Meador, March 18, 1997: US05612975 (101 worldwide citation)

A digital receiver includes a tuner and a demodulator that obtains a modulated signal carried in a received analog signal. A digital-to-analog converter operates at a preselected fixed sampling rate on the modulated signal to produce a first sequence of digitized samples. The first sequence of digit ...



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