Test apparatus for an optical recording disc

Details Test apparatus for an optical recording disc Test apparatus for an optical recording disc

1990-08-01

1993-12-28

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 2, 369 4, 369 5, G11B 700

Patent

active

052746186

ABSTRACT:
An optical recording disc on which an analog audio signal and a digital audio signal are recorded is tested. The analog audio signal results from FM-modulating 2-channel audio signals, and the digital audio signal results from modulating the same 2-channel audio signals in a digital fashion, in order to perform the test, a signal mixed with 2-channel audio signals resulting demodulating an analog audio signal and a signal mixed with 2-channel audio signals resulting from demodulating a digital audio signal are simultaneously reproduced by an electroacoustic transducer and evaluated.

REFERENCES:
patent: 4660099 (1987-04-01), Sugiyama et al.
patent: 4698695 (1987-10-01), Kosaka et al.
patent: 4723295 (1988-02-01), Kosaka et al.
patent: 4792974 (1988-12-01), Chace
patent: 4839733 (1989-06-01), Karamon et al.
patent: 4956712 (1990-09-01), Hong

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