Importance

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Abstract

In an effort to provide exceptionally high resolution playback of video information recorded in the environment of an electronic still camera, the invention calls for: (a) Use of double side band FM recording, which in the prior art would have been productive of playback interference between the side bands of harmonics and the side bands of corresponding fundamentals unless the relative head-to-media speed was high enough to accommodate high carrier frequencies. (b) Bias recording such FM video information, thereby to prevent the inherent production of harmonic information within the media. (c) Up-converting the harmonic-free playback signal, before the harmonic-causing procedure of amplitude-limiting such playback signal, thereby to cause such signal to have a spectrum-wise wide disparity between the modulated fundamental in question and its harmonics, as caused by such amplitude limiting. (d) Removing the generated harmonics (and their side bands) prior to or during demodulation of the modulated fundamental.

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First Claim