1
Wilfred Andre Maria Snijders, Nicolaas Alphonsus Maria Verhoeckx, Petrus Josephus VAN Gerwen, Hendrik Arie VAN Essen: Modulation and filtering device. U S Philips Corporation, Frank R Trifari, Simon L Cohen, January 11, 1977: US04003002 (146 worldwide citation)

A digital data transmitter is described, whose line carrier frequency need not be an integral multiple of one half the clock frequency of the digital input signal. Use is made of a digital filter for increasing the sampling frequency to a value which is twice the modulator carrier wave frequency.


2
Hendricus Christianus van den Elzen, Petrus Josephus VAN Gerwen, Wilfred Andre Maria Snijders: Arrangement for simultaneous two-way data transmission over two-wire circuits. U S Philips Corporation, Frank R Trifari, Henry I Steckler, September 26, 1978: US04117277 (26 worldwide citation)

An arrangement for simultaneous two-way data transmission of data signals with a given symbol frequency over two-wire circuits of a type found in telephone networks or of a comparable type. The arrangement comprises an echo canceler with an adaptive filter for producing from transmit channel signals ...


3
Ludwig Desire Johan Eggermont, Hendrik Arie Van Essen, Petrus Josephus Van Gerwen, Wilfred Andre Maria Snijders: Interpolating digital filter. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, October 26, 1976: US03988607 (22 worldwide citation)

An interpolating non-recursive digital filter in which the circulating storage device which has a periodically changing storage time, is controlled by a clock-pulse generator, and has an output circuit whereby within one input sampling period the input code words stored in the storage device are sup ...


4
Wilfred Andre Maria Snijders, Nicolaas Alphonsus Maria Verhoeckx, Petrus Josephus Van Gerwen, Hendrik Arie Van Essen: Digital signal processing arrangement. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, October 17, 1978: US04121296 (13 worldwide citation)

Digital signal processing arrangement such as a digital filter for computing output signal samples which are each equal to the sum of products of a given plurality of pairs (for example N) of input signal samples. One of the input signal samples of the pair is, for example, formed each time by a sam ...


5
Petrus Josephus Van Gerwen: System for the transmission of speech signals. U S Philips Corporation, Frank R Trifari, Henry I Steckler, July 5, 1977: US04034160 (12 worldwide citation)

A speech bandwidth compression system uses a first set of filters to separate the speech signal into baseband (300-800 hz) and highband (800-3200 hz) signals. The baseband (first formant or fundamental pitch frequency) is transmitted directly, and is also rectified to form harmonics which are mixed ...


6
Petrus Josephus van Gerwen, Hendrik Arie VAN Essen, Wilfred Andre Maria Snijders: Apparatus for achieving a predetermined transfer characteristic. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, June 22, 1976: US03965338 (8 worldwide citation)

A pulse switched digital multiplier for matching transfer characteristics of digital processes having a plurality of pulse switch positions, and a pulse switch setting circuit which, under the control of a setting code from a setting program, sets the pulse switch to a given one of the pulse switch ...


7
Robert Johannes Sluijter Emmasingel, NL, Petrus Josephus Van Gerwen Emmasingel, NL: Transmission system and associated transmitters and receivers for the transmission of synchronous pulse signals. US Philips Corporation New York NY, Frank R Trifari, October 31, 1972: US3701852 (7 worldwide citation)

A transmission system for the transmission of binary synchronous pulse signals in the base group of a carrier telephony system in which these pulse signals are converted into two separate pulse signals, at half the original information speed each, which separate pulse signals are each modulated in a ...


8
Wolfgang Friedrich Georg Mecklenbrauker, Petrus Josephus VAN Gerwen, Wilfred Andre Maria Snijders, Theodoor Antonius Carel Maria Claasen, Hendrik Arie Van Essen: Apparatus for achieving predetermined transfer characteristics. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, August 31, 1976: US03978323 (2 worldwide citation)

An apparatus for producing a predetermined transfer characteristic of information-containing signals, comprising clock means for generating a clock pulse, input means for supplying digital representations of said information-containing signals; coefficient generator means for supplying a first train ...


9
Petrus Josephus Van Gerwen: System for automatic equalization. U S Philips Corporation, Frank R Trifari, Simon L Cohen, November 2, 1976: US03990022 (1 worldwide citation)

Utilizing a known equalizer and a single-sideband frequency transposition device, unitary construction is achieved by using a second series of output channels which, by a crosswise connection to the comparators already present in the control voltage generator, supplies a second equalized signal shif ...



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