1
Willem F Druyvesteyn, Abraham Hoogendoorn, Leon M Van De Kerkhof, Raymond N J Veldhuis: Coder for incorporating an auxiliary information signal in a digital audio signal, decoder for recovering such signals from the combined signal, and record carrier having such combined signal recorded thereon. U S Philips Corporation, Leroy Eason, November 3, 1992: US05161210 (254 worldwide citation)

The audio signal is divided into frequency sub-bands, the sub-band samples are quantized according to a predetermined quantizing criterion, and the quantized samples in one or more sub-bands are summed with samples of the auxiliary signal in such sub-bands, the auxiliary signal sample in a sub-band ...


2
Gerrit J Koel, Willem F Druyvesteyn: Magnetic head having a core provided on a substrate by means of thin-film technology. U S Philips Corporation, Robert S Smith, August 21, 1979: US04165525 (19 worldwide citation)

A thin-film magnetic head in which the electrically conductive magnetic material of the core is wound directly a number of times around an electrical conductor which ensures the energization of the head presents the advantage that the manufacture can take place by means of exclusively electroplating ...


3
Jacobus J M Ruigrok, Victor Zieren, Ulrich E Enz, Willem F Druyvesteyn: Superconducting device for reading information from a magnetic recording medium. U S Philips Corporation, Bernard Tiegerman, February 26, 1991: US04996621 (10 worldwide citation)

Device is provided for reading information from a magnetic recording medium, comprising a SQUID (15), a magnetic yoke formed from two flux guides (3 and 5) and a face (13) for magnetic flux coupling of the SQUID with the magnetic recording medium. The SQUID is provided with connection means (33) for ...


4
Evert H L J Dekker, Willem F Druyvesteyn, Franciscus A Kuijpers, Antonius G H Verhulst: Magnetic domain device. U S Philips Corporation, Thomas A Briody, Edward J Connors Jr, James J Cannon Jr, June 5, 1979: US04157591 (6 worldwide citation)

A magnetic bubble domain memory system having a first bubble domain path composed of Permalloy pattern elements, and a second bubble domain path composed of a current conductor is disclosed. Separate drives are associated with each of the paths, so the advantages of both types of domain propagation ...


5
Ronaldus M Aarts, Willem F Druyvesteyn: Audio-visual arrangement and system in which such an arrangement is used. U S Philips Corporation, Debra K Stephens, March 3, 1998: US05724430 (2 worldwide citation)

An audio-visual arrangement, more particularly, a multi-media terminal, includes a picture screen on which pictures can be displayed. The arrangement further includes a plurality of electro-acoustic converters for reproducing sound that corresponds to audio information generated by the audio signal ...


6
Jan W F Dorleijn, Willem F Druyvesteyn, Frederik A De Jonge: Magnetic domain logic device. U S Philips Corporation, Marc D Schechter, November 17, 1987: USRE032545

A magnetic device comprising a first and a second plate of a magnetic material between which domains are situated. An interaction force occurs between the domains in the two plates. Stable domain positions in a second plate define equally stable domain positions in a first plate. One or both plates ...