21
Joseph H Rothweiler: System for digital multiband filtering. RCA Corporation, Clement A Berard Jr, Henry I Schanzer, William H Meise, September 1, 1987: US04691292 (109 worldwide citation)

A digital filter system in which the frequency spectrum of an input signal is divided into M consecutive subbands. Each subband is generated by multiplying the impulse reponse of a low pass filter by a sinusoid (sine or cosine) whose frequency is equal to the center frequency of its respective subba ...


22
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 ...


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 (105 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
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 ...


25
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 ...


26
Mehdi Hatamian: Efficient fir filter for high-speed communication. Broadcom Corporation, Christie Parker & Hale, August 7, 2001: US06272173 (101 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
Charles L Saxe, Roydn Jones: Anti-aliasing filter circuit for oscilloscopes. Tektronix, John P Dellett, November 4, 1986: US04621217 (101 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 ...


28
Petrus J Van Gerwen, Rudolf A Van Doorn, Wilfred A M Snijders, Hendrik A Van Essen: Filter and demodulation arrangement. U S Philips Corporation, Thomas A Briody, William J Streeter, Henry I Steckler, December 19, 1978: US04130806 (100 worldwide citation)

A digital filter and demodulation arrangement for passband signals, whose corresponding baseband signal has a bandwidth limited to a given maximum frequency. The passband signals are filtered according to two bandpass characteristics which, apart from their asymmetrical distortion relative to their ...


29
Michalakis Averkiou, Jeffry E Powers, Peter N Burns, David N Roundhill, Juin Jet Hwang: Ultrasonic diagnostic imaging of response frequency differing from transmit frequency. ATL Ultrasound, W Brinton Yorks Jr, March 9, 1999: US05879303 (98 worldwide citation)

An ultrasonic diagnostic imaging system and methods are described which produces ultrasonic images from harmonic echo components of a transmitted fundamental frequency. Preferably, a programmable digital filter is used to pass harmonic echo components for image processing to the exclusion of fundame ...


30
Bruce D Signore, Eric J Swanson: Method and apparatus for calibration of a monolithic voltage reference. Crystal Semiconductor Corporation, Gregory M Howison, August 8, 1995: US05440305 (97 worldwide citation)

A method and apparatus for calibration of errors in a monolithic reference includes a bandgap voltage reference (50) that outputs an untrimmed voltage and a temperature voltage. The untrimmed voltage and temperature voltage are input to a delta-sigma A/D converter (52) which has the output thereof p ...



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