Method and apparatus for transmitting data descriptive of electromagnetic waveform
First Claim
Patent Images
1. An apparatus for deriving information from a remotely situated electromagnetic waveform having a characteristic with a time varying magnitude comprising:
- fm modulator means for detecting the varying magnitude of said electromagnetic waveform and modulating the frequency of a constant amplitude continuous carrier signal in response thereto;
transmitter means operatively connected to said fm modulator means for transmitting the fm constant amplitude signal to a remote location;
detector means operatively connected to a receiver for detecting threshold crossings of the continuous fm constant amplitude signal;
subtractor means operatively connected to said detector means for comparing successive times of said threshold crossings and determining their differences; and
signal generator means operatively connected to said subtractor means for constructing a signal having a characteristic with a time varying magnitude corresponding to said characteristic with time varying magnitude of said remotely situated electromagnetic waveform.
5 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for transmitting data descriptive of an electromagnetic waveform wherein a constant amplitude signal is frequency modulated and transmitted to a remote site where digital signals are generated in response to zero crossings of the fm analog signal. Interrupt signals are generated in response to zero crossings for storing time differences between successive digital signals corresponding to the zero crossing which are then averaged at the Nyquist sampling rate to display and analyze a constructed waveform simulating the original signal.
36 Citations
11 Claims
-
1. An apparatus for deriving information from a remotely situated electromagnetic waveform having a characteristic with a time varying magnitude comprising:
-
fm modulator means for detecting the varying magnitude of said electromagnetic waveform and modulating the frequency of a constant amplitude continuous carrier signal in response thereto; transmitter means operatively connected to said fm modulator means for transmitting the fm constant amplitude signal to a remote location; detector means operatively connected to a receiver for detecting threshold crossings of the continuous fm constant amplitude signal; subtractor means operatively connected to said detector means for comparing successive times of said threshold crossings and determining their differences; and signal generator means operatively connected to said subtractor means for constructing a signal having a characteristic with a time varying magnitude corresponding to said characteristic with time varying magnitude of said remotely situated electromagnetic waveform. - View Dependent Claims (2, 3, 4)
-
-
5. Apparatus for deriving information from a frequency modulated waveform comprising
detector means having an input to which said waveform can be applied for detecting threshold crossings thereof, subtractor means operatively connected to said detector means for comparing successive times of said threshold crossings and determining their differences, and signal generator means operatively connected to said subtractor means for constructing a signal having a characteristic with a time varying magnitude corresponding to said determined time differences.
-
9. A method for deriving information from a remotely situated electromagnetic waveform having a characteristic with a varying magnitude comprising
detecting the varying magnitude of said electromagnetic waveform and modulating the frequency of a constant amplitude continuous carrier signal in response thereto, transmitting the fm constant amplitude signal to a remote location, receiving the fm constant amplitude signal at said remote location, detecting threshold crossings of the continuous fm constant amplitude signal received at said remote location, comparing successive times of said threshold crossings, determining the differences between said successive times of said threshold crossings, and constructing a signal having a characteristic with a time varying magnitude corresponding to said differences between said successive times of said threshold crossings.
Specification