TY - JOUR
AU - Farr, R. F.
AB - Abstract A clinical foetal electrocardiograph is described which produces diagnostically useful foetal ECG's from abdominal electrodes only. The output is comparatively free from maternal ECG and noise. Good signal-to-noise ratio is achieved by first adding signals obtained from several pairs of electrodes placed on the maternal abdomen. The maternal signal is then “gated out” by using signal delay provided by a magnetic tape recorder and pulse delay circuits. Further improvement in signal-to-noise ratio is then obtained by feeding successive foetal signals into a signal averaging device. The use of two such devices is described—one a trace brightness integration system using an image storage tube (Cawkell, Remscope), and the other a computer (Mnemotron, Computer of average transients, Model 400 B); results with these instruments are compared. Traces are shown at each stage of signal improvement; photographs and circuit diagrams of the equipment are included, together with a block diagram of the whole apparatus. Difficulties of foetal heart rate measurement are discussed and an effective method shown.
TI - A clinical foetal electrocardiograph
JF - Medical & Biological Engineering & Computing
DO - 10.1007/bf02474158
DA - 1966-03-01
UR - https://www.deepdyve.com/lp/springer-journals/a-clinical-foetal-electrocardiograph-AkFAY0QjcP
SP - 159
EP - 167
VL - 4
IS - 2
DP - DeepDyve
ER -