1
Hans Jurgen Butterweck, Theodoor Antonius Carel Maria Claasen, Wolfgang Friedrich Georg Mecklenbrauker, Johannes Bernhard Heinrich Peek: Digital signal processing device with quantizer. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, July 5, 1977: US04034196 (26 worldwide citation)

A digital signal processing device of the recursive type, such as a recursive digital filter or a digital oscillator, comprising a storage device for storing at least one first code word related to an output code word, multiplying means for multiplying said first code word by a given weighting facto ...


2
Hans Jurgen Butterweck, Adrianus C P van Meer, Gerard Verkroost: Recursive digital filter. U S Philips Corporation, Robert T Mayer, Steven R Biren, February 4, 1986: US04569030 (11 worldwide citation)

A recursive digital filter includes a first circuit 1 including a cascade arrangement of a magnitude truncation quantizing arrangement and an adder 6, 8. The first circuit has an output 5, and also inputs 3 and 4, output 5 being connected to the input 3 via a second circuit 10 and to the input 4 via ...


3
Gerard Verkroost, Hans Jurgen Butterweck: Digital signal processing arrangement including a wave digital filter. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, June 13, 1978: US04095276 (4 worldwide citation)

A digital signal processing arrangement including a wave digital filter having quantizing means for limiting the signal waves present to a predetermined word length by means of controlled rounding. "Controlled rounding" means that a limit-cycle-free output signal is obtained when a constant input si ...