US PATENT SUBCLASS 369 / 51
.~.~ Control of spiral track spacing (e.g., signal variable pitch)

Current as of: June, 1999
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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

47  DF  CONTROL OF STORAGE OR RETRIEVAL BY A SIGNAL TO BE RECORDED OR REPRODUCED (E.G., PILOT OR CONTROL SIGNAL) {2}
50  DF  .~ Mechanism control by information signal (e.g., voice responsive) {1}
51.~.~ Control of spiral track spacing (e.g., signal variable pitch)

DEFINITION

Classification: 369/51

Control of spiral track spacing (e.g., signal variable pitch):

(under subclass 50) Subject matter wherein the information signal adjusts the displacement between adjacent record tracks during storage of the signal.

(1) Note. Such adjustment is often necessary for high values of signal amplitude when recording lateral grooves.