초록 ▼

An analog signal which is affected by impulse noise is applied to a timing circuit that generates a sampling pulse in response to a noise impulse introduced in the desired signal. This noise-affected signal is also applied to a holding circuit which passes it in the absence of the sampling pulse and

An analog signal which is affected by impulse noise is applied to a timing circuit that generates a sampling pulse in response to a noise impulse introduced in the desired signal. This noise-affected signal is also applied to a holding circuit which passes it in the absence of the sampling pulse and holds it in the presence of the sampling pulse to derive therefrom a modified analog signal. A differentiator generates a signal representative of the time-varying rate of the analog signal. A sampling circuit samples the rate representative signal in response to the sampling pulse and holds the sampled signal for the duration of the sampling pulse to derive therefrom a rectangular pulse, so that the amplitude and polarity of the rectangular pulse represent the gradient and polarity of the noise-affected portion of the signal. The rectangular pulse is integrated linearly at a rate variable as a function of the amplitude of the rectangular pulse to generate a ramp voltage. An adder combines the ramp voltage with the modified signal to generate a reconstructed signal.

대표청구항 ▼

A circuit for suppressing impulse noise imposed on an analog signal, the circuit having an input terminal to which the analog signal is applied and an output terminal, comprising: means connected to said input terminal for generating a sampling pulse in response to the impulse noise in said analog s

A circuit for suppressing impulse noise imposed on an analog signal, the circuit having an input terminal to which the analog signal is applied and an output terminal, comprising: means connected to said input terminal for generating a sampling pulse in response to the impulse noise in said analog signal; delay means coupled to said input terminal for delaying said analog signal so that the impulse noise is time-coincident with said sampling pulse; a differentiator responsive to an output signal from said delay means; first sample-and-hold means connected to be responsive to said analog signal, as derived by said delay means, for generating a waveform which is a replica of the analog signal, as derived by said delay means, when said sampling pulse is absent and for holding said waveform in response to derivation of said sampling pulse; second sample-and-hold means connected to said differentiator for generating a rectangular pulse in response to said sampling pulse; a resettable integrator connected to said second sample-and-hold means for generating a ramp voltage in response to said sampling pulse, said ramp voltage having a slope variable as a function of the amplitude of said rectangular pulse; and a summing circuit for summing said ramp voltage with an output signal from the first sample-and-hold means and applying a summed output signal to said output terminal.