Parkhurst & Oliff
Apparatus for detecting input signal
 An input signal containing a base line which fluctuates to a great extent is detected or restored by comparing the input signal with reference levels which are shifted in accordance with the fluctuation of base line. The input signal is sampled at a variable sampling rate and an average of sampled values for a predetermined period is derived to produce a profile signal which resembles accurately the fluctuation of the base line. The profile signal thus obtained is added to upper and lower threshold voltages to produce the reference levels which have been corrected in accordance with the fluctuation of the base line of input signal. 
Olympus Optical Company Limited
H
H03K
inventional
Shozi Masaharu Hiroshi Kiichi Ken Kunio
Yoshikawa Sakamoto Kodama Kato Ohsima Yamamiya