Amplitude limiting circuit for frequency modulated video signals
AssigneeVictor Company of Japan, Ltd.
InventorsYoshihiko Ota, Akira Hirota
Life of this patent
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Abstract
An amplitude limiting circuit comprises a high-pass filter for passing the high frequency components of a frequency modulated video signal. The centerline of a signal portion has an amplitude width which is non-linear. A first amplitude limiter both limits and amplifies the output signal from the high-pass filter. A low-pass filter passes the low frequency component of the frequency modulated video signal. An adder adds the resulting output signals of the first amplitude limiter and the low-pass filter. A second amplitude limiter limits the resulting output of the adder.
Claims5
An amplitude limiting circuit comprising:
- a source of frequency modulated video signals including a signal portion having a nonlinear centerline between the amplitude crests of the waveforms;
- high-pass filtering means for passing the high frequency component of the frequency modulated video signal;
- first amplitude limiting means for limiting the amplitude of the resulting output of the high-pass filtering means;
- low-pass filtering means for passing the low frequency component of the frequency modulated video signal;
- means for adding the output signal of the first amplitude limiting means and the output of the low-pass filtering means;
- and
- second amplitude limiting means for limiting the amplitude of the resulting output of the adding means.
Dependencies are inferred from the claim text.