منابع مشابه
Frequency-domain testing of waveform digitizers
An easy to use, robust and accurate frequency-domain procedure for estimating the spectral performance of waveform digitizers is considered in this paper. Its properties are analyzed and almost unbiased estimators are proposed along with simple but accurate expressions for their variances. Experimental results are presented to validate the proposed analysis. Directions and criteria useful for t...
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A digitizer is an electronic acquisition device that acquires analog waveforms, processes them through analog-to-digital converters (ADC’s) and sends the digitized sample to a buffer, which allows them to be saved before being processed by a computer. Historically, modern digitizers date from the 1950’s and 60’s when the need to rapidly acquire, store, and process multiple channels of data beca...
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We present one of the first attempt at implementing a massively parallel frequency-domain full-waveform inversion algorithm for imaging 3D acoustic media. The inverse method is based on a classic steepest-descent algorithm. The algorithm was designed so that one or several frequencies are inverted at a time. Wave propagation modeling, a key component of the inversion algorithm, is performed wit...
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This study derives the discretized adjoint states full waveform inversion (FWI) in both time and frequency domains based on the Lagrange multiplier method. To achieve this, we applied adjoint state inversion on the discretized wave equation in both time domain and frequency domain. Besides, in this article, we introduce reliability tests to show that the inversion is performing as it should be ...
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Scanning A/Ds, waveform digitizers and oscilloscopes all digitize analog signals. In all three instrument types, the purpose is to capture all significant details (i.e., frequency components) of the input waveform so that information can be extracted. These instruments differ in how performance parameters are optimized, the depth of user control over the data acquisition process, and the level ...
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ژورنال
عنوان ژورنال: IEEE Transactions on Instrumentation and Measurement
سال: 2002
ISSN: 0018-9456
DOI: 10.1109/tim.2002.1017714