Patents by Inventor Johannus L. Bakx
Johannus L. Bakx has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6700861Abstract: The invention relates to an optical disc for recording data at a constant density, so called CLV (Constant Linear Velocity) or at zoned CLV. The disc has headers distributed along the disc on regular angular positions, a so called CAV (Constant Angular Velocity) pattern subdividing the track in track portions for recording an amount of data proportional to the radial position of the track portion concerned. Address information included in the headers is provided at the data density, which is CLV. The apparatus comprises header detection means for detecting the headers at the CAV locations, and for recovering position information from the headers at CLV density. Data sectors do not start at headers and are not fitted regularly between the headers, but start and stop at arbitrary positions which are calculated from the known amounts of data recordable in the track portions.Type: GrantFiled: January 22, 2003Date of Patent: March 2, 2004Assignee: Koninklijke Philips Electronics N.V.Inventors: Gijsbert J. Van Den Enden, Johannes H. M. Spruit, Johannus L. Bakx, Shoei Kobayashi, Masayuki Arai, Yoshiyuki Akiyama
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Publication number: 20030128644Abstract: The invention relates to an optical disc for recording data at a constant density, so called CLV (Constant Linear Velocity) or at zoned CLV. The disc has headers distributed along the disc on regular angular positions, a so called CAV (Constant Angular Velocity) pattern subdividing the track in track portions for recording an amount of data proportional to the radial position of the track portion concerned. Address information included in the headers is provided at the data density, which is CLV. The apparatus comprises header detection means for detecting the headers at the CAV locations, and for recovering position information from the headers at CLV density. Data sectors do not start at headers and are not fitted regularly between the headers, but start and stop at arbitrary positions which are calculated from the known amounts of data recordable in the track portions.Type: ApplicationFiled: January 22, 2003Publication date: July 10, 2003Applicant: Koninklijke Philips Electronics N.V.Inventors: Gijsbert J. Van Den Enden, Johannes H. M. Spruit, Johannus L. Bakx, Shoei Kobayashi, Masayuki Arai, Yoshiyuki Akiyama
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Patent number: 6580680Abstract: The invention relates to an optical disc for recording data at a constant density, so called CLV (Constant Linear Velocity) or at zoned CLV. The disc has headers distributed along the disc on regular angular positions, a so called CAV (Constant Angular Velocity) pattern subdividing the track in track portions for recording an amount of data proportional to the radical position of the track portion concerned. Address information included in the headers is provided at the data density, which is CLV. The apparatus comprises header detection means for detecting the headers at the CAV locations, and for recovering position information from the headers at CLV density. Data sectors do not start at headers and are not fitted regularly between the headers, but start and stop at arbitrary positions which are calculated from the known amounts of data recordable in the track portion.Type: GrantFiled: August 4, 1999Date of Patent: June 17, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Gijsbert J. Van Den Enden, Johannes H. M. Spruit, Johannus L. Bakx, Shoei Kobayashi, Masayuki Arai, Yoshiyuki Akiyama
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Patent number: 6320825Abstract: A method for recording audio information on a record carrier, typically a bitstream signal on an optical disc, is disclosed. In the method the audio information is encoded to compressed audio data having a variable bitrate, in particular using lossless compression. The compressed audio data is recorded at a transfer speed which is controlled in dependence on the variable bitrate. A transfer speed profile (53, 54, 55) is determined for items of audio information, e.g. for each track on a CD, in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of said item. Stuffing data is added to the compressed audio data according to the transfer speed profile, and transfer speed profile information is recorded on the record carrier for enabling playback at a transfer speed as indicated by the transfer speed profile information. Also a recording device, a record carrier and a playback device are disclosed.Type: GrantFiled: July 26, 1999Date of Patent: November 20, 2001Assignee: U.S. Philips CorporationInventors: Alphons A.M.L. Bruekers, Wiebe De Haan, Johannus L. Bakx, Leon M. Van De Kerkhof
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Patent number: 6137755Abstract: An apparatus for scanning an optically readable record carrier 1, in which a light beam modulated by the information marks in a track on the record carrier is incident on a detection unit with four detectors. A reliable tracking error signal based on time differences between detector signals, is obtained for high-density recording by comparing digitized signals of the detectors with a delayed signal Td generated by a delay unit and based on the digitized signals. The time differences between the detector signals result in length differences between pulses in the comparing signals A and B, which pulses have a nominal length of Td. The comparing signals A and B are low-pass filtered and combined to generate the tracking error signal TE.Type: GrantFiled: April 20, 1998Date of Patent: October 24, 2000Assignee: U.S. Philips CorporationInventors: Johannus L. Bakx, Anthonius L. J. Dekker
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Patent number: 6075670Abstract: For scanning a disc-shaped information carrier at a high average information rate and with minimum access time, the angular velocity is decreased substantially as the radial distance to the scan location increases, while at the same time the linear velocity of track scanning increases substantially. The track may be divided into zones which are scanned with constant angular velocity. With respect to the inner tracks of at least two adjacent zones, or the innermost and the outermost tracks, the angular velocity decreases less than inversely with increase of radial distance, while the linear velocity increases less than proportionally with increase of radial distance.Type: GrantFiled: October 3, 1995Date of Patent: June 13, 2000Assignee: U.S. Philips CorporationInventors: Gheorghe S. Stan, Johannus L. Bakx
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Patent number: 5844865Abstract: The disclosed system includes a disc-shaped information carrier and an apparatus for reading and writing information blocks in a continuous track. For indicating the track, the information carrier has a servotrack in which a winding number is encoded per track winding. A winding number and an angular position can be determined from the address of an information block. The angular position is given relative to a reference angular position. This reference angular position is determined by one or more reference marks which are written on the information carrier prior to the first information block. The actual angular position is determined by counting the time relative to a known rotation time from the reading of a reference mark onwards. One or more pulses, for example tachopulses, are generated per revolution in the apparatus.Type: GrantFiled: April 8, 1996Date of Patent: December 1, 1998Assignee: U.S. Philips CorporationInventor: Johannus L. Bakx
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Patent number: 5617399Abstract: Disclosure is given of a device and method for recording by means of a radiation beam user information on a record carrier. The user information is written in the form of optically detectable marks in concentric tracks. The tracks are subdivided into sectors. The record carrier used has ring-shaped zones. Within these zones lie the sectors aligned seen in radial direction. For writing the marks in the tracks, a write intensity of the radiation beam is set to a determined set value. For this purpose, a test information pattern is written in a buffer sector which is situated on an edge of a zone. Then the test information pattern is read back during which operation the test information pattern is converted to a corresponding test data pattern. Based upon the test data pattern a set value for the write intensity is determined.Type: GrantFiled: February 10, 1995Date of Patent: April 1, 1997Assignee: U.S. Philips CorporationInventors: Johannes H. M. Spruit, Johannus L. Bakx
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Patent number: 5418773Abstract: A record carrier having essentially circular tracks concentrically located around a point of rotation. The record carrier is divided into circular zones each having m tracks, where m is an integer. Each track within a zone is subdivided into n sectors, where n is an integer which is constant per zone and which increases as the zone is more remote from the point of rotation. Each sector including a header portion and a data portion. The header portions in the radial direction in each zone are in line. In each zone the condition of m*n=j*k is satisfied, where is j an integer greater than or equal to 2 and is constant for each zone, and k is an integer.Type: GrantFiled: July 2, 1993Date of Patent: May 23, 1995Assignees: International Business Machines Corporation, U.S. Philips CorporationInventors: Johannus L. Bakx, Paulus G. P. Weijenbergh, Karl A. Belser, Glen A. Jaquette, John E. Kulakowski, Judson A. McDowell, Rodney J. Means
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Patent number: 5365508Abstract: A magneto-optical read/write device having a radiation detection system which includes two radiation-sensitive detectors the outputs of which are connected via DC coupled current-to-voltage converters to an input of an adder circuit and an input of a subtracter circuit to obtain a sum signal and a difference signal. The sum signal on the output of the adder circuit is coupled to an input of a selection circuit via a capacitive coupling. The difference signal on the output of the subtracter circuit is coupled to another input of the selection circuit. The output of the selection circuit is coupled to a signal processing circuit via another capacitive coupling. The device is particularly suited for use with a magneto-optical record carrier having sector headers with a pre-arranged pit structure.Type: GrantFiled: November 18, 1993Date of Patent: November 15, 1994Assignee: U.S. Philips CorporationInventor: Johannus L Bakx
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Patent number: RE38703Abstract: For scanning a disc-shaped information carrier at a high average information rate with minimum access time, the angular velocity is decreased substantially as the radial distance to the scan location increases, while at the same time the linear velocity of track scanning increases substantially. The track may be divided into zones which are scanned with constant angular velocity. With respect to the inner tracks of at least two adjacent zones, or the innermost and the outermost tracks, the angular velocity decreases less than inversely with increase of radial distance, while the linear velocity increases less than proportionally with increase of radial distance.Type: GrantFiled: June 12, 2002Date of Patent: February 15, 2005Assignee: Koninklijke Philips Electronics N.V.Inventors: Gheorghe S. Stan, Johannus L. Bakx