Disc playback apparatus with automatic disc changer

Details Disc playback apparatus with automatic disc changer Disc playback apparatus with automatic disc changer

1992-06-26

1996-11-05

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

369 54, G11B 1926

Patent

active

055723802

ABSTRACT:
A disc playback apparatus has an automatics disc changer for selecting one of a plurality of information storage discs at a time. The disc selected by the automatic disc changer is rotated on a turntable by a spindle motor. While the disc is rotating, information contained in the disc is reproduced by a pickup, which transfers the reproduced information to a buffer memory. The information stored in the buffer memory is transferred to and processed by a decoder which decodes and sends the information to a display. The disc playback apparatus includes a controller for monitoring the amount of information stored in the buffer memory and controlling the rotational speed of the disc depending on the amount of information stored in the buffer memory. The rotational speed of the disc is controlled to cause the pickup to transfer the reproduced information to the buffer memory at a maximum rate before the buffer memory becomes full of stored information. When the buffer memory is full of stored information, the rotational speed is controlled to cause the pickup to transfer the reproduced information to the buffer memory at a constant rate lower than the maximum rate. The constant rate is equal to a rate at which the stored information is transferred from the buffer memory to the decoder.

REFERENCES:
patent: 4860272 (1989-08-01), Nishikawa et al.
patent: 4872073 (1989-10-01), Fincher et al.
patent: 4922476 (1990-05-01), Kiyoura et al.
patent: 5224089 (1993-06-01), Matsumura et al.

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