scispace - formally typeset
Search or ask a question

Showing papers on "Bessel filter published in 1998"


Book ChapterDOI
01 Jan 1998
TL;DR: In this article, the authors discuss the problem of repruction, or the coying of m acineredable fles (inluding his one) to ny srver om pter, is described.
Abstract: IS B N 0-5243064-X ) C opright (C ) 19-1992 by C am bidge U nirsity P res.P rogram s C opright (C ) 19-1992 by N um eical R eipes S ftw are. P rm ission is grnted or inrnet uers to m ke ne pper cpy or teir ow n peonal use. F uther repruction, or ny coying of m acineredable fles (inluding his one) to ny srver om pter, is sictly proibited. T o oder N um eical R eipes boks or C D R O M s, visit w esite hp://w w w .n.com or call 1-8072-7423 (N orth A m erica on),or snd em il to direcustserv@ am brie.org (otside N orth A m eca). For n larger than a dozen or so, betai is a much better way to evaluate the sum in

166 citations


Journal ArticleDOI
TL;DR: A new filter with transient characteristics that are comparable to those of the modified Paynter filter but with superior high-frequency attenuation is designed and constructed, a modified seventh-order Bessel filter.
Abstract: Platt, Ronald S., Eric A. Hajduk, Manuel Hulliger, and Paul A. Easton. A modified Bessel filter for amplitude demodulation of respiratory electromyograms. J. Appl. Physiol. 84(1): 378–388, 1998.—We...

16 citations


Journal ArticleDOI
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


Journal ArticleDOI
TL;DR: In this article, the authors investigated corresponding expressions for sums of reciprocal powers of zeros of derivatives and other functions related to Bessel functions and obtained results similar to Kishore's expressing in terms of and.
Abstract: N Kishore (1963 Proc. Am. Math. Soc. 14 527) considered the Rayleigh functions , , where the are the (non-zero) zeros of the Bessel function and provided a convolution-type sum formula for finding in terms of . Here we investigate corresponding expressions for sums of reciprocal powers of zeros of derivatives and other functions related to Bessel functions. It turns out that we can get results similar to Kishore's expressing in terms of and .

10 citations


Journal Article
TL;DR: In this article, a low-pass to high-pass crossover is constructed from a Bessel lowpass filter employing the standard lowpass-to-high-pass transformation, which is compared to the Butterworth and Linkwitz-Riley types in terms of the magnitude, phase, and time domain responses.
Abstract: One of the ways that a crossover may be constructed from a Bessel low-pass filter employs the standard low-pass to high-pass transformation. Various frequency normalizations can be chosen for best magnitude and polar response, although the linear phase approximation in the passband of the low-pass is not maintained at higher frequencies. The resulting crossover is compared to the Butterworth and Linkwitz-Riley types in terms of the magnitude, phase, and time domain responses.

8 citations


Journal ArticleDOI
TL;DR: A gaussian type quadrature formula, where the nodes are the zeros of Bessel functions of the first kind of order α (R(α) > -1), was recently proved for entire functions of exponential type.
Abstract: A gaussian type quadrature formula, where the nodes are the zeros of Bessel functions of the first kind of order α (R(α) > -1), was recently proved for entire functions of exponential type. Here we relax the restriction on α as well as on the function. Some applications are also given.

7 citations


Patent
Peter Stroet1, Rishi Mohindra1
29 Jun 1998
TL;DR: In this paper, a phase shifter network is proposed to demodulate a frequency-modulated signal with a phase shift network to provide a demodulated signal that has a relatively constant amplitude around the center frequency of the frequency modulated signal and exhibits a linear phase change over an operational frequency range.
Abstract: An approach for demodulating a frequency-modulated signal involves processing a frequency-modulated signal with a phase shifter network to provide a demodulated signal that has a relatively constant amplitude around the center frequency of the frequency-modulated signal and that exhibits a relatively linear phase change over an operational frequency range. Embodiments of the invention include a phase shifter network, using N number of cascaded all-pass filters, that receives as an input a limited amplitude signal and outputs a phase-shifted limited amplitude signal that is mixed with the limited amplitude signal. The phase shifter network may also comprise a low-pass bessel filter.

6 citations


Proceedings ArticleDOI
J. Egerer1, T. Desel, Popken, J. Boxho, D. Macq, J.-P. Cornil 
13 Sep 1998
TL;DR: In this paper, a low distortion 5/sup th/order R-MOSFET-C Bessel filter was designed in a 0.5 /spl mu/m, 3.3 V CMOS technology.
Abstract: For an HDSL analog front end, a low distortion 5/sup th/ order R-MOSFET-C Bessel filter was designed in a 0.5 /spl mu/m, 3.3 V CMOS technology. The filter is linearly tunable around cutoff frequencies of 488 kHz and 335 kHz by an on-chip tuning circuit. The fabricated prototypes show linear tuning and a THD<-75 dB for a 100 kHz signal.

6 citations


Journal ArticleDOI
TL;DR: An architecture for a fixed-delay tree search with feedback (FDTS/DF) channel which uses a maximum transition run-length code and the critical timing path in this new detector is comparable to that of a decision feedback detector.
Abstract: This paper presents an architecture for a fixed-delay tree search with feedback (FDTS/DF) channel which uses a maximum transition run-length code. The critical timing path in this new detector is comparable to that of a decision feedback detector. The forward filter consists of a first-order all-pass filter cascaded with a fourth-order Bessel filter. Timing and gain recovery are also discussed.

2 citations


Journal ArticleDOI
TL;DR: In this paper, a method of design of optical filters with periodic reflectivity peaks on the wave number axis is proposed for a dielectric multilayered film type and a waveguide type.
Abstract: A method of design of optical filters with periodic reflectivity peaks on the wave number axis is proposed for a dielectric multilayered film type and a waveguide type. There is approximately a Fourier transform relationship between the refractive index profile and the reflectivity of the filter. This relationship resembles the one between the time domain waveform of a signal and its frequency response in communication. By using this resemblance, the refractive index profile is described as an FM modulation function so that the filter characteristics based on the Bessel function can be realized. Since the magnitudes of the reflectivity peaks are not identical if a monotonic FM modulation function is used, higher-order terms are introduced into the phase term of the function for correction. Also, the (effective) index of refraction used for transformation of the variation of the refractive index profile to a rectangular waveform is only binary valued. From the results of the analysis, a filter design method is proposed. In both the multilayer type and the waveguide type, the results are very close to the desired filter characteristics. © 1998 Scripta Technica, Electron Comm Jpn Pt 2, 81(10): 19–29, 1998

1 citations


Journal ArticleDOI
TL;DR: In this article, the authors considered an oversampled DFT filter bank, where the number of channels is an integer multiple of the decimation ratio, and a design method was presented for a filter bank with minimum delay.
Abstract: When a filter bank satisfies the conditions for perfect reconstruction, the whole transfer function has the property of a single delay. In the application to subband adaptive filters and other problems, this delay is directly reflected, for example, in the transfer delay of the speech signal. This paper considers an oversampled DFT filter bank, where the number of channels is an integer multiple of the decimation ratio. The delay is investigated, and a design method is presented for a filter bank with minimum delay. As the first step, the minimum delay of the filter bank satisfying the conditions of perfect reconstruction and causality is given by the number of channels minus 1, regardless of the decimation ratio or the number of filter taps. The design method for the filter bank with this minimum delay is formulated. Lastly, a detailed design example is presented and the effectiveness of the proposed method is verified. © 1998 Scripta Technica. Electron Comm Jpn Pt 3, 81(1): 71–78, 1998

Patent
03 Jun 1998
TL;DR: In this article, the transmitter has an optical p-i-n type interferometric structure with two branch sections (Ba,Bb) and a control voltage is applied to each section by a control circuit, which is formed by addition of a constant voltage and an additional voltage produced from the input electrical signal which is pass band filtered.
Abstract: The transmitter has an optical p-i-n type interferometric structure (1) with two branch sections (Ba,Bb). A control voltage is applied to each section by a control circuit (2). The control voltages are formed by addition of a constant voltage and an additional voltage (ea) produced from the input electrical signal which is pass band filtered. The filter is preferably a Bessel filter and the branch sections are formed from waveguide sections with the same structure but different lengths.

Book ChapterDOI
01 Jan 1998
TL;DR: This paper describes RF amp integrated circuit for the read channel of optical disc players that include CD and DVD demanding the equalizer and the decision block, implemented in a 0.8um CMOS n-well technology.
Abstract: This paper describes RF amp integrated circuit for the read channel of optical disc players that include CD and DVD demanding the equalizer and the decision block. A RF equalizer is composed of boosting filter to slim the data pulse and 9th order Bessel filter to attenuate high frequency noise. Boosting filter emphasize 6dB at 6MHz and maintains the linear phase within 1% by pole zero cancellation method. An important advantage is tuneability of the boosting and frequency characteristics by controlling the transconductance, therefore, it is enough to cover the tolerance of fabrication. The high frequency noise due to equalization is attenuated by 9th order Bessel filter which has the slope of over -42dB/oct. Measured jitter keeps within 4.5n. The decision block includes one bit analog to digital converter and the low pass filters to detect asymmetry and asymmetric amp. As the analog and the digital signals are mixed on a chip, the main ground and the NMOS bulk ground, DGND and AGND respectively, are separated. Also, it is laid out very carefully to minimize the digital noise in analog block Implemented in a 0.8um CMOS n-well technology, the RF equalizer and the decision block chip occupy 3000um × 1000um. Power consumption from asingle 5V is around 300mW.