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 (112 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
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 (110 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 ...


24
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 ...


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 (108 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
Mehdi Hatamian: Efficient fir filter for high-speed communication. Broadcom Corporation, Christie Parker & Hale, August 7, 2001: US06272173 (106 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 ...


27
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 ...


28
Peter Chaikin, Geoffrey Christopherson, Brian Ellison, John Lee, Miguel Paganini, C Rex Reed, Timothy Shuttleworth, Gregory Wright: Self-calibrating loudspeaker system. Harman International Industries Incorporated, Brinks Hofer Gilson & Lione, November 5, 2013: US08577048 (104 worldwide citation)

Systems and methods for calibrating a loudspeaker with a connection to a microphone located at a listening area in a room. The loudspeaker includes self-calibration functions to adjust speaker characteristics according to effects generated by operating the loudspeaker in the room. In one example, th ...


29
Malcolm J Williamson, Diane K Bustamante: Feedback suppression in digital signal processing hearing aids. Wisconsin Alumni Research Foundation, Foley & Lardner, February 25, 1992: US05091952 (103 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 ...


30
Harunori Tokutsu: Weighing apparatus having an automatic filter adjusting capability. Ishida, Staas & Halsey, August 7, 2001: US06271484 (102 worldwide citation)

In order to provide a combination weighing apparatus having an automatic filter adjusting capability which is effective to secure a weighing accuracy and also to adjust a filter characteristic of a digital filter having a short response time, the filter characteristic is automatically adjusted, base ...