Charles M Mecca

US Patent:

58125060, Sep 22, 1998

Filed:

Nov 3, 1997

Appl. No.:

8/963513

Inventors:

Anthony E. Pietrzykoski - Plains PA
Floyd L. Goss - Lake Ariel PA
Charles Mecca - Jessup PA

Assignee:

WEA Manufacturing, Inc. - Olyphant PA

International Classification:

G11B 700

US Classification:

369 54

Abstract:

A system for testing compact discs having audio or video information and time subcode information indicating the elapsed time from the beginning of the audio, video or data information thereon in which three microprocessors respectively monitor the HF signal, the radial tracking signal and the decoder digital flags produced by a CD player to produce error signals indicating HF dropout, HF low, modulation amplitude, radial tracking, Burst, Bler, and uncorrectable errors and in which a computer having a memory responds to the time signal produced by the player periodically to transfer the contents of the microprocessors to the memory together with the time of transfer and to reset the microprocessors, thus to record errors and to locate the positions thereof on the disc in terms of the time subcode information. Initially an eccentricity test is performed and the entire test is stopped if the eccentricity is excessive. The computer is programmed to display the test results in various formats.