On/off-track detecting apparatus for compatible disk player

Details On/off-track detecting apparatus for compatible disk player On/off-track detecting apparatus for compatible disk player

1990-04-23

1992-07-14

Levy, Stuart S.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 53, 369 55, 369 32, G11B 390, G11B 1722

Patent

active

051309670

ABSTRACT:
An on-track and off-track state detecting apparatus in a compatible disk player capable of playing different types of disks, each carrying thereon at least one of a FM audio signal and an EFM signal. The apparatus detects an on-track state and off-track state by comparing the level of the FM audio signal component with a predetermined level, when the disk being played back does not carry the EFM signal, and by comparing the level of the EFM signal component with a predetermined level, when the disk being played back carries the EFM signal thereon. This apparatus commonly uses a level comparator circuit and performs a reliable detection of the respective on-track and off-track states.

REFERENCES:
patent: 4512002 (1985-04-01), Kosaka et al.
patent: 4701897 (1987-10-01), Nakagawa
patent: 4773052 (1988-09-01), Sugiura
patent: 4794579 (1988-12-01), Baas
patent: 4855978 (1989-08-01), Kanamaru
patent: 4860272 (1989-08-01), Nishikawa
patent: 4893193 (1990-01-01), Nakamura et al.
patent: 4897827 (1990-01-01), Raetzer et al.
patent: 4964000 (1990-10-01), Kanota

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