Abraham Hoogendoorn | Researchain

Archive Network Publication Hotspot Collaboration

Network

Latest external collaboration on country level. Dive into details by clicking on the dots.

Explore More

Hotspot

Dive into the research topics where Abraham Hoogendoorn is active.

Explore More

Publication

Featured researches published by Abraham Hoogendoorn.

Journal of the Acoustical Society of America | 1993

Apparatus for recording an audio signal with protection against re-recording thereof, and recording apparatus which indicates the presence of such protection

Abraham Hoogendoorn; Gerardus Cornelis Petrus Lokhoff

Low-frequency components of the left and right channels of the audio signal to be recorded are derived by means of filters (3, 4). First and second auxiliary signals are added to such low-frequency components in such a way that during reproduction of the audio signal so recorded, including the first and the second auxiliary signals added thereto, by means of two loudspeaker units arranged in a stereo configuration, the two auxiliary signals are not audible. However, they will inhibit re-recording by apparatus for recording audio signals which are not copy-protected in the form of the aforesaid two auxiliary signals, or will cause such apparatus to indicate that the audio signal to be re-recorded is protected.

Archive | 1989

Coder for incorporating extra information in a digital audio signal having a predetermined format, decoder for extracting such extra information from a digital signal, device for recording a digital signal on a record carrier, comprising such a coder, and record carrier obtained by means of such a device

Willem Frederik Druyvesteyn; Abraham Hoogendoorn; De Kerkhof Leon Maria Van; Raymond N. J. Veldhuis

Archive | 1989

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

Willem Frederik Druyvesteyn; Abraham Hoogendoorn; Leon Maria van de Kerkhof; Raymond N. J. Veldhuis

Archive | 1984

System for reproducing information signals on a magnetic tape which incrementally adjusts, in a plurality of steps the speed of the magnetic tape and the positioning and rotational speed of the magnetic head upon a change of mode

Abraham Hoogendoorn; Franz Kuchar

Archive | 1993

Recording device with temperature-dependent write-current control

Rudolf Alexander Van Doorn; Stephanus Josephus Maria Van Beckhoven; Gerardus Wilhelmus A Akkermans; Francisus Johannes R Verhallen; Abraham Hoogendoorn

Archive | 1990