METHOD AND DEVICE USING SHORTENED SQUARE WAVE WAVEFORMS IN SYNCHRONOUS SIGNAL PROCESSING
First Claim
1. A method for measuring an impedance of an object, the method comprising introducing a first periodic signal into the object, receiving a response signal from the object, introducing said response signal and a second periodic signal into a synchronous detector, wherein said first periodic signal and said second periodic signal have the same main frequency characterized in that generating at least one of said first periodic signal and said second periodic signal by summing at least two modified rectangular subsignals, at least one of said modified rectangular subsignals comprising a rectangular half periods that are shortened by zero amplitude segments at each end of said subsignal, wherein the length of the zero amplitude segment is selected to suppress particular higher harmonics in that signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for impedance measurements, using synchronous detecting and modified rectangular signals. The method comprises introducing a first modified rectangular signal into a bioobject, receiving a response signal from said bioobject, introducing said response signal and a second modified rectangular signal into a synchronous detector, whereas either one or both rectangular signals are modified to remove particular higher harmonics from the signal. In one embodiment, either one or both the first and the second modified rectangular signals are generated by summing at least two modified rectangular signals, wherein at least one of such rectangular signals have a zero amplitude segment introduced between rectangular half periods.
47 Citations
10 Claims
- 1. A method for measuring an impedance of an object, the method comprising introducing a first periodic signal into the object, receiving a response signal from the object, introducing said response signal and a second periodic signal into a synchronous detector, wherein said first periodic signal and said second periodic signal have the same main frequency characterized in that generating at least one of said first periodic signal and said second periodic signal by summing at least two modified rectangular subsignals, at least one of said modified rectangular subsignals comprising a rectangular half periods that are shortened by zero amplitude segments at each end of said subsignal, wherein the length of the zero amplitude segment is selected to suppress particular higher harmonics in that signal.
-
3. A method for measuring an impedance of an object, the method comprising:
-
introducing a first periodic signal into the object, receiving a response signal from the object, introducing said response signal and a second periodic signal into a synchronous detector, wherein said first periodic signal and said second periodic signal have the same main frequency; and generating at least one of said first periodic signal and said second periodic signal by summing at least two modified rectangular subsignals, at least one of said modified rectangular subsignals comprising rectangular half periods that are shortened by zero amplitude segments at each end of said subsignal, wherein the length of the zero amplitude segment is selected to suppress particular higher harmonics in that signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
-
Specification