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
Nicolaas Alphonsus Maria Verhoeckx, Herman VAN DER Hoff, Cornelis Henricus Johannes Vos, Johannes Wilhelmus Coenders: Videophone system synchronizer. U S Philips Corporation, Frank R Trifari, Henry I Steckler, January 25, 1977: US04005265 (38 worldwide citation)

In a videophone system sound, video, synchronizing and signalling signals are to be transmitted through a single pair of telephone cables of existing telephone communications. In that case sound, synchronizing and signalling signals are transmitted in a digital form and the video signals are transmi ...


3
Hendrik Arie Van Essen, Nicolaas Alphonsus Maria Verhoeckx, Wilfred Andre Maria Snijders: Interpolating digital filter with input buffer. U S Philips Corporation, Frank R Trifari, Daniel R McGlynn, December 14, 1976: US03997773 (30 worldwide citation)

A non-recursive interpolating digital filter for generating, output code works, at an arbitrary rational ratio between the input and output sampling frequencies. The input code words are entered and stored in a buffer, and entered into a storage device at predetermined times determined by a controll ...


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 ...



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