Showing papers on "Anti-aliasing published in 1969"

System for reconstructing a digital signal

Abstract: A SYSTEM IS PROVIDED FOR REPRODUCING A TRANSMITTED SIGNAL HAVING ALTERNATE UPPER AND LOWER VOLTAGE LEVELS FROM A RECEIVED SIGNAL REPRESENTING THE TRANSMITTED SIGNAL CONTAMINATED WITH HIGH AND LOW FREQUENCY NOISE. A REFERENCE SIGNAL IS DEVELOPED HAVING A VOLTAGE LEVEL WHICH IS NOMINALLY MIDWAY BETWEEN THE UPPER AND LOWER VOLTAGE LEVELS OF THE TRANSMITTED SIGNAL, AND WHICH IS SHIFTED IN RESPONSE TO THE LOW FREQUENCY NOISE WITHIN THE RECEIVED SIGNAL. A LOCAL SIGNAL IS PRODUCED HAVING THE UPPER VOLTAGE LEVEL WHEN THE VOLTAGE LEVEL OF THE RECEIVED SIGNAL IS ABOVE THE VOLTAGE LEVEL OF THE REFERENCE SIGNAL, AND HAVING THE LOWER VOLTAGE LEVEL WHEN THE VOLTAGE LEVEL OF THE RECEIVED SIGNAL IS BELOW THE VOLTAGE LEVEL OF THE REFERENCE SIGNAL. THE LOCAL SIGNAL DUPLICATES THE TRANSMITTED SIGNAL.