Topic
Bessel filter
About: Bessel filter is a research topic. Over the lifetime, 656 publications have been published within this topic receiving 16808 citations.
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17 Dec 2010
TL;DR: In this paper, a modification of data transmission filter by the application of Generalized Bessel transformations with rational filter is presented, which gives the denominator of filter transfer function in analytic closed form, while its numerator is determined by solving a set of transmission zeros and even polynomial of order.
Abstract: This paper present modification of data transmission filter by the application of Generalized Bessel transformations with rational filter. The technique gives the denominator of filter transfer function in analytic closed form, while its numerator is determined by solving a set of transmission zeros and even polynomial of order. The results to filter is straightforward and will be given in a later more detailed contribution together with comparison with the other existing design methods, such a comparison reveals the superiority of the present technique.
12 citations
TL;DR: ZEros of BEssel functions Complex (ZEEC) as discussed by the authors is a portable software package which localizes and computes simple zeros of Bessel functions of the first, the second or the third kind, or their derivatives.
12 citations
TL;DR: A magnetic field exposure system that has been used to test human subjects, caged or confined animals, and cell cultures and is limited by the maximum voltage of the amplifier (Bessel filter bypassed).
Abstract: To maximize the availability and usefulness of a small magnetic field exposure laboratory, we designed a magnetic field exposure system that has been used to test human subjects, caged or confined animals, and cell cultures. The magnetic field exposure system consists of three orthogonal pairs of coils 2 m square × 1 m separation, 1.751 m × 0.875 m separation, and 1.5 m × 0.75 m separation. Each coil consisted of ten turns of insulated 8 gauge stranded copper conductor. Each of the pairs were driven by a constant-current amplifier via digital to analog (D/A) converter. A 9 pole zero-gain active Bessel low-pass filter (1 kHz corner frequency) before the amplifier input attenuated the expected high frequencies generated by the D/A conversion. The magnetic field was monitored with a 3D fluxgate magnetometer (0–3 kHz, ± 1 mT) through an analog to digital converter. Behavioral monitoring utilized two monochrome video cameras (viewing the coil center vertically and horizontally), both of which could be video recorded and real-time digitally Moving Picture Experts Group (MPEG) encoded to CD-ROM. Human postural sway (standing balance) was monitored with a 3D forceplate mounted on the floor, connected to an analog to digital converter. Lighting was provided by 12 offset overhead dimmable fluorescent track lights and monitored using a digitally connected spectroradiometer. The dc resistance, inductance of each coil pair connected in series were 1.5 m coil (0.27 Ω, 1.2 mH), 1.75 m coil (0.32 Ω, 1.4 mH), and 2 m coil (0.38 Ω, 1.6 mH). The frequency response of the 1.5 m coil set was 500 Hz at ± 463 μT, 1 kHz at ± 232 μT, 150 μs rise time from −200 μTpk to + 200 μTpk (square wave) and is limited by the maximum voltage ( ± 146 V) of the amplifier (Bessel filter bypassed). Bioelectromagnetics 22:401–407, 2001. © 2001 Wiley-Liss, Inc.
12 citations
TL;DR: In this paper, a new mechanism for ultra-wide and tunable self-oscillating optical frequency comb (OFC) based on a novel frequency tunable optoelectronic oscillator (OEO) is proposed using cascaded configuration of optical phase-modulator (PM) and electro-absorption-modulators (EAM).
Abstract: A new mechanism for ultra-wide and tunable self-oscillating optical frequency comb (OFC) based on a novel frequency tunable optoelectronic oscillator (OEO) is proposed using cascaded configuration of optical phase-modulator (PM) and electro-absorption-modulator (EAM). The proposed scheme does not require a dedicated RF source to drive the optical-modulators. The OEO is configured by incorporating the self-oscillation loop with cascaded modulators. A high-speed PIN-photodetector (PD) with a dark current of 10nA, bandwidth of 20 GHz, and responsivity of 1A/W in correspondence with an electrical-amplifier (EA), and bandpass Bessel filter (BPBF) is utilized to convert the optical signal into a microwave signal. The PD detected signal is amplified by the EA. The BPBF is used to extract a 10 Mhz bandwidth from the amplified signal with tunable central frequencies. Part of the extracted OEO signal is directly connected to the PM, whereas, a 180-degree phase-shift is added to the signal before transmitting into the EAM. The PM produces ~19 carrier frequencies, whereas, the generated tunable carriers by the EAM ranges from 85 to 35carrriers with an overall bandwidth of ~1.28THz. The negligible power-fluctuations, good number of generated carriers, and high tone-to-noise-ratio of around 40 dB endorse the applicability of the proposed scheme.
12 citations
TL;DR: In this paper, a procedure for the high-precision calculation of the modified Bessel function Kν(x), 0 < ν < 1, and the Airy function Ai(x, for positive arguments x, as pre-requisites for generating Gaussian quadrature rules having these functions as weight function is described.
Abstract: Procedures are described for the high-precision calculation of the modified Bessel function Kν(x), 0 < ν < 1, and the Airy function Ai(x), for positive arguments x, as pre-requisites for generating Gaussian quadrature rules having these functions as weight function.
12 citations