Digital Low-Pass Differentiation for Biological Signal Processing

Usui, Shiro; Amidror, Itzhak

doi:10.1109/tbme.1982.324861

Cited by 197 publications

(61 citation statements)

References 5 publications

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“…Often the continuum background was removed by the use of high-pass filtering on the dynamic spectra (usually differentiation). This filtering, however, amplifies the high-frequency noises therefore the smoothed differentiation filter of Usui and Amidror (1982) was used. This performs simultaneously a smoothing and differentiation so it can be regarded as a low-pass differentiation filter (digital differentiator) appropriate for experimental (noisy) data processing.…”

Section: Data Processingmentioning

confidence: 99%

Interplanetary Type IV Bursts

2016

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We study the characteristics of moving type IV radio bursts which extend to the hectometric wavelengths (interplanetary type IV or type IV IP bursts) and their relationship with energetic phenomena on the Sun. Our dataset comprises 48 interplanetary type IV bursts observed with the Radio and Plasma Wave Investigation (WAVES) instrument onboard Wind in the 13.825 MHz-20 kHz frequency range. The dynamic spectra of the Radio Solar Telescope Network (RSTN), the Nançay Decametric Array (DAM), the Appareil de Routine pour le Traitement et l' Enregistrement Magnetique de l' Information Spectral (ARTEMIS-IV), the Culgoora, Hiraiso and Izmiran Radio Spectrographs were used to track the evolution of the events in the low corona. These were supplemented with soft X-ray (SXR) flux-measurements from the Geostationary Operational Environmental Satellite (GOES) and coronal mass ejections (CME) data from the Large Angle and Spectroscopic Coronagraph (LASCO) onboard the Solar and Heliospheric Observatory (SOHO). Positional information of the coronal bursts was obtained by the Nançay radioheliograph (NRH). We examined the relationship of the type IV events with coronal radio bursts, CMEs and SXR flares. The majority of the events (45) were characterized as compact; their duration was on average 106 minutes. This type of events was, mostly, associated with M-and X-class flares (40 out of 45) and fast CMEs; 32 of these events had CMEs faster than 1000 km s −1 . Furthermore, in 43 compact events the CME was, possibly, subjected to reduced aerodynamic drag as it was propagating in the wake of a previous CME. A minority (three) of long lived type IV IP bursts was detected, with duration from 960 minutes to 115 hours. These events are referred to as extended or long duration and appear to replenish their energetic electron content, possibly from electrons escaping from the corresponding coronal type IV bursts. The latter were found to persist on the disk, for tens of hours to days. Prominent among them was the unusual interplanetary type IV burst of 18-23 May 2002, which is the longest event in the Wind /WAVES catalog. The three extended events were, usually, accompanied by a number of flares, of GOES class C in their majority, and of CMEs, many of which were slow and narrow.

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Section: Data Processingmentioning

confidence: 99%

Interplanetary Type IV Bursts

2016

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“…Target and eye position signals were digitally sampled at 400 samples per sec per chan nel (12 bit resolution) and stored on disk for offline anal ysis. Eye-velocity was obtained digitally, using the com putational method of Usui and Amidror (1982) with parameters n = 1.5, L = 0.5 (bandwidth OC-52.5 Hz).…”

Section: Eye Movement Recordingmentioning

confidence: 99%

The Effect of Apomorphine, MK-212 (6-chloro-2-[1-piperazinyl]-pyrazine) and Placebo on Smooth Pursuit Gain and Corrective Saccades in Normal Subjects

Friedman

Jesberger

Meltzer

1994

Neuropsychopharmacol

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The effects of apomorphine (0.01 mg lkg SC) a direct acting dopamine (DA) agonist, MK-212 (6-chloro-2-{1-piperaziny/J-pyrazine) (20 mg PO), a direct-acting serotonin (5-HT) agonist, and placebo on smooth pursuit fYe movements were evaluated in 10 to 12 normal volunteers. Smooth pursuit was tested just prior to administration of either apomorphine, MK-212, or placebo (on separate days), and then repeatedly tested at 30 min intervals for two hours after dose administration. The smooth pursuit targets were a series of predictable, constant velocity ramps with velocities of 5° Isec (slow target) and 200lsec (fast target). Eye movements were recorded with infrared oculography, and the following six measures were obtained; steady-state gain (slow-target gain; fast-target-gain), corrective catch-up saccade (CUS) rate (slow-target-CUS-rate; fast-target-CUS-rate), and CUS amplitude (slow-target-CUS-amplitude; fast-target CUS-amplitude). The placebo test yielded a statistically significant monotonic decrease over time in slow-target gain and corresponding increase in slow-target-CUS-

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“…The rise rate, computed using a simple "low pass differentiator" (Usui & Admiror 1982) with a user definable threshold level was applied for potential recognition. Each potential recognized as belonging to the given sequence was marked with a cursor.…”

Section: Methodsmentioning

confidence: 99%

Different Types of Fibrillation Potentials in Human Needle EMG

Partanen¹

2013

Electrodiagnosis in New Frontiers of Clinical Research

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Digital Low-Pass Differentiation for Biological Signal Processing

Cited by 197 publications

References 5 publications

Interplanetary Type IV Bursts

Interplanetary Type IV Bursts

The Effect of Apomorphine, MK-212 (6-chloro-2-[1-piperazinyl]-pyrazine) and Placebo on Smooth Pursuit Gain and Corrective Saccades in Normal Subjects

Different Types of Fibrillation Potentials in Human Needle EMG

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