Apparatus and method for enhancing playback fidelity of compact disks
AssigneeKolbe-Podwil Sonics, Inc.
InventorsHarry Kolbe, Jerome J. Podwil
Life of this patent
Estimating the term…
Abstract
A method and apparatus improve the playback fidelity and quality of a compact disk player by controlling charge conditions in the zone of interaction between the playback read head and a CD. In one form of apparatus, an electrode is associated with the read head, and an ion generator coupled to the electrode provides an electrostatic field. The introduction of random noise to the field potentiates or enhances the improvement.
Claims15
A method for improving the output fidelity of playback apparatus for a compact disk, wherein the playback apparatus comprises a read head juxtaposed to and spaced from the surface of the disk and the read head provides a laser beam for scanning a sector of the disk, and means for rotating the disk relative to the read head, comprising the steps of:
- interposing between the read head and the surface of the disk an electrostatic field;
- positioning the field so that the field impinges upon at least the sector of the disk which is about to be scanned by the laser beam;
- causing the electrostatic field to be so charged that it opposes preexisting electrostatic fields in the space between the read head and the disk;
- introducing into the space between the surface of the disk and the read head in proximity to the laser beam a magnetic field interacting with the laser beam;
- and
- introducing random noise into said electrostatic field.
In a playback apparatus for a compact disk, comprising a read head juxtaposed to and spaced from a surface of a disk when the disk is operatively disposed, the playback apparatus providing means for rotating the disk and the head having associated therewith a laser source providing a laser beam for scanning the disk as the disk moves relative to the read head, a device for improving the output fidelity of the playback apparatus, said device comprising
- electrostatic field generating means coupled to the read head for generating an electrostatic field in the space between the read head and the disk in the vicinity of the laser beam so that said electrostatic field impinges on at least that area of the disk which is about to be scanned by the laser beam, said electrostatic field being so charged that it opposes an electrostatic field preexisting in the space between the read head and the disc in the vicinity of the laser beam;
- means coupled to said read head for providing a magnetic field in the space between said read head and a disk to be read, in operative association with the laser beam;
- and
- a noise generator operatively associated with said electrostatic field generating means for introducing random noise into the electrostatic field.
Dependencies are inferred from the claim text.