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US 5,182,520 AGranted
Non-linear de-emphasis circuit
AssigneeSony Corporation
InventorKaoru Urata
Life of this patent
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Abstract
In an apparatus for non-linear de-emphasis of an input signal, an amplitude limiting signal is obtained by subtracting a high-pass filtered and amplitude limited input signal from the original input signal, then the amplitude limiting signal is amplified with a gain determined by the amplitude of the amplitude limiting signal and subtracted from the input signal to provide a non-linearly de-emphasized signal with an improved signal-to-noise ratio and without substantial deterioration in high frequency small amplitude components of the input signal.
Claims3
An apparatus for non-linear de-emphasis of an input signal, comprising:
- first subtracting means for subtracting an amplitude limiting signal from said input signal so as to produce a first subtracted signal;
- high-pass filtering means for extracting high frequency components from said first subtracted signal so as to produce a high frequency signal;
- first limiting means having a first amplitude limiting value for amplitude limiting said high frequency signal so as to produce said amplitude limiting signal;
- non-linear amplifying means for amplifying, when said amplitude limiting signal has a smaller amplitude than a predetermined value, said amplitude limiting signal with a gain higher than 1, and for amplifying, when the amplitude of said amplitude limiting signal is equal to or higher than said predetermined value, said amplitude limiting signal with a gain less than 1, so as to produce a non-linear amplified signal;
- and
- second subtracting means for subtracting said non-linear amplified signal from said input signal so as to produce a non-linearly de-emphasized signal.
3 more elements
Dependencies are inferred from the claim text.