Patent ID: 8843335
Filing Date: 2014-09-23
Classification: G01R,G06F,G16Z

Abstract:
1. A method for producing a denoised output waveform from a noisy waveform by a time domain measurement instrument running a computer program stored to a non-transitory computer readable storage medium associated therewith, the computer program causing the time domain measurement instrument to perform the steps of: providing the noisy waveform as an input waveform; determining a frequency domain noise shape associated with the input waveform; calculating a wavelet domain noise shape from the frequency domain noise shape; calculating a discrete wavelet transform of the input waveform to form a wavelet domain waveform; estimating the noise statistics from the wavelet domain waveform; calculating a threshold from the estimated noise statistics and the wavelet domain noise shape; applying the threshold to the wavelet domain waveform to form a denoised wavelet domain waveform; and calculating an inverse discrete wavelet transform of the denoised wavelet domain waveform to form a denoised waveform.