Patent
Method for measuring RF pulse frequency
Pei-Hwa Lo,Elliott J. Greene +1 more
TLDR
In this article, a method for measuring the frequency of a stream of RF pulses using multi-purpose, commercial off-the-shelf test devices, such as an RF signal down converter, a digitizer and a signal processor, was proposed.Abstract:
A method for measuring the frequency of a stream of RF pulses using multi-purpose, commercial-off-the-shelf test devices, such as an RF signal down converter, a digitizer and a signal processor The method is based on digital signal processing and determining the zero-crossings of the signal using signal interpolation of the pulse points The method is suitable for real-time calculations of the frequencyread more
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Patent
Method for measuring RF pulse rise time, fall time and pulse width
Elliott J. Greene,Pei-Hwa Lo +1 more
TL;DR: In this paper, a method for measuring the rise/fall time and pulse width of RF pulses using multi-purpose, commercial off-the-shelf test devices, such as an RF signal down converter, a digitizer and a signal processor, is presented.
Patent
Process and machine for signal waveform analysis
TL;DR: In this paper, the electrical waveform is sampled and converted to a series of voltages, and the voltages are interpolated in order to form a time tag list (222), using interpolations that are optimized for time interval measurement and analysis.
Patent
Method of waveform time stamping for minimizing digitization artifacts in time interval distribution measurements
TL;DR: In this paper, a threshold offset value generator generates a distribution of offset values for dithering the threshold value, which are stored as the time stamps and the number of occurrences of time interval values are accumulated in time bins.
Patent
Dual channel downconverter for pulsed radio frequency measurements
TL;DR: In this article, a dual channel downconverter that includes a two-channel heterodyne receiver architecture for downconverting two frequency-agile, pulsed RF signals to identical fixed IF signals without the use of a tunable local oscillator is presented.
Patent
Mode selection methods for signal analyzers having alternative swept and fast fourier transform modes of operation
TL;DR: In this article, a mode selection method for signal analyzers having alternative swept and Fast Fourier Transform (FFT) modes of operation enables tradeoffs between measurement speed and dynamic range to be optimized in selecting between the alternative operating modes.
References
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Patent
Ultrasonic doppler flowmeters
Werner Huebscher,Max Anliker +1 more
TL;DR: An improved stationary filter circuit utilizing a finite iteration then suppresses unwanted masking "clutter", i.e., low frequency but large amplitude signals from stationary tissue interfaces, with significantly improved response time and dynamic range, while providing good resolution.
Patent
Method of digitally processing sinusoidal ac signals
TL;DR: In this paper, a sinusoidal ac signal is subjected to periodic sampling having a period Delta t, where a product of one sampled value of the signal taken at a certain sampling point and another sampled value at the next sampling point apart, by an interval of time equal to the period delta t, from the previous sampling point is made.
Patent
Ultrasonic speckle velocity measurement method and apparatus
Masato Nakajima,Takashi Ito +1 more
TL;DR: An ultrasonic speckle velocity measurement method and apparatus that uses the transmission and reception of ultrasonic waves to detect the velocity of moving members comprised of random scattering bodies is described in this paper.
Patent
Highly accurate zero crossings for frequency determination
TL;DR: In this paper, the authors used trigonometric identities to compute the location of the zero, which is very precise, but requires the use of an inverse trigonometric function.
PatentDOI
Ultrasonic doppler imaging apparatus
TL;DR: In this article, an ultrasonic Doppler imaging apparatus is presented in which the velocity of a blood flow in a living body can be computed with high precision without increasing a scale of a signal processing circuit.