Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1982-08-27
1985-06-25
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
369133, H04N 592, G11B 300
Patent
active
045257515
ABSTRACT:
A video disc record of the constant angular velocity type (CAV) includes a spiral groove of constant pitch formed in a band on a surface thereof. The groove has a substantially constant nominal vertical dimension and vertical displacements which taper monotonically from an outer radius of the band to an inner radius. One component of the vertical displacement of the groove conveys an FM carrier wave of constant amplitude and relatively high frequency representative of picture information. A second component of the vertical displacement conveys one or more lower frequency FM carrier waves representative of sound information. The amplitude of the second component varies monotonically as a function of the groove radius within the record band to provide a disc having an improved audio FM carrier-to-noise ratio with no substantial perceptible increase in undesirable sound beat effects in images displayed when the disc is played. A mastering system exemplary of the method of forming the grooved disc includes variable gain units in an audio FM carrier wave processing path of the system.
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Castle Richard M.
Economou John E.
Freeman Edward J.
Halter Jerome B.
James Jack E.
Coalter R. G.
McElheny Jr. Donald
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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