Noise reduction by linear interpolation using a dual function amplifier circuit

A noise reduction circuit having an input terminal to which an information signal is applied and an output terminal, comprising:

• means connected to said input terminal for detecting a noise impulse introduced in said information signal and generating therefrom a sampling pulse time-coincident with the portion of the signal affected by said noise impulse;
• a switch connected in a circuit path between said input and output terminals for passing said information signal therethrough in the absence of said sampling pulse and blocking said signal in response to said sampling pulse;
• a noninverting amplifier connected in said circuit path between said switch and said output terminal for amplifying said signal;
• a differentiator including a resistor and a first capacitor connected from the output of said noninverting amplifier to the input thereof;
• and
• a second capacitor connected to said first capacitor forming a node at the input of said noninverting amplifier for storing a voltage from said switch and a voltage from said differentiator when said signal is blocked.