Circuit for reconstructing noise-affected signals.

摘要

@ An analog signal which is affected by impulse noise is applied to a timing circuit (12) that generates a sampling pulse in response to an impulse noise introduced in the desired signal. This noise-affected signal is also applied to a holding circuit (5) which passes it in the absense of the sampling pulse and holds it in the presence of the sampling pulse to derive therefrom a modified analog signal. A differntiator (6) generates a signal representative of the time-varying rate of the analog signal. A sampling circuit (7, 8) is provided for sampling the rate representative signal in response to the sampling pulse and holding 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 by an integrator (9) as a function of the amplitude of the rectangular pulse to generate a ramp voltage. An adder (10) combines the ramp voltage with the modified signal to generate a reconstructed signal.