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| Number | Title | Issue Date |
| 7366461 | Method and apparatus for improving the quality of a recorded broadcast audio program Recordings of broadcast audio content often contain errors (e.g., noise, signal loss, interference, talkover). A method and apparatus are provided for improving the quality of such a recording. Multiple recordings of a broadcast audio program are identified, and are... | 04/29/2008 |
| 7345975 | Metrological digital audio reconstruction Audio information stored in the undulations of grooves in a medium such as a phonograph record may be reconstructed, with little or no contact, by measuring the groove shape using precision metrology methods coupled with digital image processing and numerical analys... | 03/18/2008 |
| 7330414 | Method for reconstruction of phonograph records from physical measurement A method for reconstructing the original groove configuration of a phonograph record. The methodology comprises providing an instrument for measuring the entire groove of a phonograph with an instrument in communication with a computer. The computer reconstructs the... | 02/12/2008 |
| 7236667 | Techniques for use of nanocavities to enhance quantum processing with photons and the Zeno effect Techniques are provided for placing atoms inside an appropriate nanocavity for enhancing two-photon absorption and quantum information processing based on the Zeno effect. Techniques for fabricating suitable nanocavities include: 1) a short length of optical fiber p... | 06/26/2007 |
| 7197458 | Method and system for verifying derivative digital files automatically A method and apparatus for verifying automatically that a plurality of derivative audio (or other multimedia) files have acceptable sound quality. In one embodiment, each derivative file is compared on a byte-by-byte basis to a corresponding original file to generat... | 03/27/2007 |
| 7094609 | Spatially addressable combinatorial chemical arrays in encoded optical disk format A method for preparing very large spatially-addressable arrays of chemical compounds by light-directed synthesis is provided, wherein the light is provided by a laser and the compounds are arrayed on a rotating disc in a CD-ROM format. A method for assaying the resu... | 08/22/2006 |
| 6898028 | Optical device and optical reproducing apparatus An optical reproducing apparatus in which reproduction of information is carried out by using an optical record carrier. In order to compensate a radial tilt between the surface of the record carrier and the objective lens, the objective lens is tilted. In the optic... | 05/24/2005 |
| 6829207 | Method for reconstruction of phonograph records from physical measurement A method for reconstruction the original groove configuration of a phonograph record. The methodology comprises providing an instrument for making measurements of the geometry of a groove of a phonograph record with the instrument in communication with a computer an... | 12/07/2004 |
| 6587421 | Refractive index matching means coupled to an optical fiber for eliminating spurious light An optical data storage system utilizes optical fibers for transfer of information to and from storage media. The storage media comprises magneto-optical storage disks. The optical fibers are low-birefringence optical fibers. As compared with conventional... | 07/01/2003 |
| 6249062 | Method and apparatus of pseudogrounding To provide a method of pseudogrounding which is capable of protecting against EMI by pseudogrounding communication lines, etc. without necessity of expensive ferrite cores and increasing the number of steps and cost. A wiring which is connected to an LSI ... | 06/19/2001 |
| 6122429 | Rare earth doped barium titanate thin film optical working medium for optical devices Optical waveguides exhibiting non-linear and/or electro-optic properties comprise a rare earth doped barium titanate thin film as an optical working medium. The thin film is metalorganic chemical vapor deposited on a substrate in a reactor to incorporate ... | 09/19/2000 |
| 6108293 | Gain control of a reproduced signal amplifier for precise monitoring of a reproduced signal during recording An optical disk recording device for conducting reading and recording of data through irradiation of laser beam on an optical disk medium comprises a photo detection circuit for receiving input of reflected light from an optical disk medium to detect a re... | 08/22/2000 |
| 5986997 | Updatable optical data storage disc having reduced crosstalk between tracks, and drive for same An updatable optical data storage disc for use with a laser includes a substrate and a recording layer. The substrate contains pre-recorded information in the form of concentric or spiral tracks of pits. Recordable tracks are positioned between adjacent p... | 11/16/1999 |
| 5856969 | Optical disk which reduces cross erasure of data recorded on lands and grooves An optical disk is formed with grooves and lands for optically tracking an optical signal along a disk substrate. The lands and grooves are tracking guides on the surface of the disk substrate are coated with a recording film. The recording film varies in... | 01/05/1999 |
| 5825743 | Illuminating multiple data tracks of an optical disk with a laser source of reduced coherence Methods and apparatus are provided for illuminating an optical disk in a multi-track optical disk reader. A laser beam is collimated and focused onto an area including multiple, adjacent data tracks on the optical disk. To minimize noise caused by interfe... | 10/20/1998 |
| 5745467 | Optical information recording method and apparatus In mark length modulation recording, a mark end portion correction pulse train is added to a recording pulse train, or laser radiation with bias power is applied between the recording pulse train and laser radiation with cooling power or the mark end port... | 04/28/1998 |
| 5740146 | Method and apparatus for reducing noise using a plurality of recording copies The present invention provides a method for reducing noise using a plurality of recording copies. The present invention produces a master file with lower noise than the available recording copies, and avoids the problems of losing musical content caused b... | 04/14/1998 |
| 5729514 | Cross talk removing device utilizing signal from main track to subtract amplitude adjusted signals from adjacent tracks A device for removing a crosstalk component mingled from an adjacent track to a target track from a reproduction signal of the target track is provided for automatically adjusting a coefficient on which the amplitude of the reproduction signal of the adja... | 03/17/1998 |
| 5712839 | Laser light power control system having reflected light detector A power control system controls power of light emitted from a light source to a recording medium. The light having a first power is used to erase previous information from the recording medium and the light having a second power is used to record informat... | 01/27/1998 |
| 5701286 | Super-resolution optical head device which produces side spots without side lobes A super-resolution optical head device includes a diffraction grating having central and peripheral areas. The central area suppresses zero order diffracted light and produces &#b1;1th order diffracted light. The peripheral area produces both zero order d... | 12/23/1997 |
| 5696752 | Low noise atip detection from an optical recording medium with wobbled grooves An apparatus for use in an optical system in which information is read from a recorded wobbled groove of an optical medium by detecting first and second portions of a return beam in first and second detectors producing detected signals, respectively, the ... | 12/09/1997 |
| 5680384 | Laser emission unit, optical head and optical memory device A laser emission unit for use in an optical head performs a plurality of functions which are integrated. A laser beam from the laser emission unit mounted in a lens holder is emitted through an objective lens and is focused on an optical medium. A reflect... | 10/21/1997 |
| 5661713 | Optical information reproducing apparatus with a threshold level generator to eliminate DC level fluctuation A level sensor circuit compares a threshold level from a threshold value generator circuit with that of an input sampling signal to create a binarized pulsated signal. A change point detector circuit detects a change point of binary information indicated ... | 08/26/1997 |
| 5657309 | Video disc recording and playback system with two recording areas to record an information signal and a reference signal A disc recording device for recording a first information signal and a second information signal, e.g. a pilot signal, on a disc-shaped recording medium comprises an optical pick-up having first and second laser diodes for recording the first and second i... | 08/12/1997 |
| 5657305 | Optical information recording and reproducing apparatus including a total reflection surface or a light shield plate disposed between a polarized light separating surface and a detection device for light beam compensation An optical head for an opto-magnetic information recording and reproducing apparatus having stable characteristics. The optical head has a forward path optical system including a polarization beam splitter for reflecting a linearly-polarized light beam in... | 08/12/1997 |
| 5621715 | Optical integrated circuit An optical integrated circuit includes a substrate and a thin film formed on the substrate. A waveguide is formed by the thin film. A grating coupler includes a plurality of coupling regions for introducing an incident light beam into the waveguide, and f... | 04/15/1997 |
| 5612942 | Optical head A light radiated from a light source is focused to provide a light spot on an optical disc. A central portion of the radiated light is shielded, and a peripheral portion of the radiated light is modulated to have an intensity decreasing in an outer periph... | 03/18/1997 |
| 5608713 | Bit allocation of digital audio signal blocks by non-linear processing A method and an apparatus for transmitting digital signals are disclosed. The input digital signal is converted into a plurality of blocks each having a finite time width and an finite frequency width. Signal components of at least some of the blocks are ... | 03/04/1997 |
| 5581538 | Recording/reproducing apparatus with a probe to detect data recorded in pits and projections of a recording medium A probe is displaced relative to a recording medium according to a drive voltage. A chip is provided at an end of the probe. The chip serves to form pits and projections on a surface of the recording medium according to a recording voltage (Vp2) and serve... | 12/03/1996 |
| 5577016 | Recording medium having concavo-convex pits with a maximum and a minimum pit depth depending on the wavelength of a laser light The information recording and reproducing apparatus includes: a recording medium including a plurality of concavo-convex pits; a light source for emitting laser light; a section for changing an optical characteristic value of the laser light, using intera... | 11/19/1996 |
| 5572503 | Correcting non-linear distortions of optical information with a non-linear equalizer An optical disk device which uses a light spot for reproducing data, including photodetector, a decoder, and a non-linear equalizer provided between the photodetector and the decoder for correcting non-linear distortions in a reproduced signal from an opt... | 11/05/1996 |
| 5570334 | Optical pickup with a double refraction polarizing plate to split light beams into two polarized beams An optical pickup apparatus to produce two polarized beams to be irradiated onto a given track of a recording medium with neighboring each other. The optical pickup apparatus includes a laser light source for generating beams irradiated on a recording med... | 10/29/1996 |
| 5559784 | Multi-layer optical information detection by two laser beam and optical multilayer recording medium An optical information reproducing apparatus having an optical recording medium in which information is recorded in a state that it is optically reproduced, and an optical head for reproducing the recorded information from the recording medium while movin... | 09/24/1996 |
| 5557600 | Optical recording medium with trays located so that multiple tracks can be scanned simultaneously An apparatus for playback of an optical recording medium where data are recorded after combined calculation of a difference signal and a sum signal generated by detecting reference patterns and the return light reflected from the optical recording medium.... | 09/17/1996 |
| 5548573 | Optical information reproducing apparatus provided with laser power control means for detecting reflected light from data region An optical information reproducing apparatus for reproducing information from an optical recording medium that has a recording and reproducing and information-rewritable track region, which is composed of a header region having information, such as a sect... | 08/20/1996 |
| 5539718 | Optical head for controlling light irradiation in a magneto-optical recording and/or reproducing apparatus An optical head includes an irradiating device for irradiating a recording medium with a light beam, a separating device disposed in an optical path between the recording medium and the irradiating device, which is provided for separating a portion of the... | 07/23/1996 |
| 5511058 | Distortion correction of a reconstructed holographic data image A detected image output by a holographic storage system is comprised of a grid of dark and light spots, representing high and low logic states. The image is superimposed onto a grid of detector elements or pixels in a detector. Each of the data bits is re... | 04/23/1996 |
| 5491682 | Apparatus and method for controllable gain and phase matching in an optical data storage system with source noise subtraction An apparatus and method for reducing optical source noise and other common-mode system noise in a data signal read from an optical storage medium. An exemplary apparatus in accordance with one aspect of the present invention includes a first detector to g... | 02/13/1996 |
| 5488600 | Differential optical switch for data multiplexing in an optical fiber loop of an optical information storage apparatus An optical information storage apparatus includes a differential type optical switch element, and an optical fiber. The optical switch element shifts from a non-emission state to an emission state upon reception of an optical input. The optical fiber cons... | 01/30/1996 |
| 5488598 | Optical pickup using split beams impinging on different photodetector areas An optical pickup apparatus having a photo-detection unit having a plurality of detectors, a unit for converting a light beam emitted from a recording medium on which information is magnetically recorded and intensity-modulated, and splitting the light be... | 01/30/1996 |
