G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2, 352/18
G11B 7/00 (2006.01) G11B 9/06 (2006.01) G11B 19/24 (2006.01) G11B 19/28 (2006.01) G11B 20/10 (2006.01) G11B 27/10 (2006.01)
Patent
CA 1177164
ABSTRACT OF THE DISCLOSURE Apparatus for reproducing from a record disc a run length limited PCM audio signal of the type comprised of a plurality of frames of data and a plurality of transition intervals such that maximum and minimum limits are providedd for the transition intervals, and at least one maximum transition interval is provided in each frame of data, the apparatus comprising an optical transducer which reproduces the PCM audio signal from the record disc during relative movement between said transducer and the record disc; a waveform shaping circuit for producing an output signal corresponding to the reproduced PCM audio signal and having portions of opposite polarities so that the output signal includes a plurality of transition intervals; a clock pulse generator for generating clock pulses having a constant frequency higher than the bit frequency of the output signal; a counter for detecting the period of each transition interval of the output signal by counting the number of clock pulses generated during each detected transition interval of the output signal; a NAND gate for determining, during each of at least one predetermined period selected to be longer than the period Image X one frame period, if the number of the clock pulses counted by said counter during each detected transition interval in each respective longer predetermined period corresponds to a predetermined number of clock pulses included in the maximum transition interval which occurs when the record disc is rotating at a predetermined constant linear velocity, and for producing a velocity control signal in response thereto; and a drive circuit for controlling rotation of the record disc at the predetermined constant linear velocity in response to the velocity control signal.
413235
Gowling Lafleur Henderson Llp
Sony Corporation
LandOfFree
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