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Voltage-controlled filter

About: Voltage-controlled filter is a research topic. Over the lifetime, 5514 publications have been published within this topic receiving 70872 citations. The topic is also known as: VCF.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors presented a new methodology for the synthesis of tunable patch filters, which helps the designer to perform a theoretical analysis of the filter through a coupling matrix that includes the effect of tuning elements used to tune the filter.
Abstract: A new methodology for the synthesis of tunable patch filters is presented. The methodology helps the designer to perform a theoretical analysis of the filter through a coupling matrix that includes the effect of the tuning elements used to tune the filter. This general methodology accounts for any tuning parameter desired and was applied to the design of a tunable dual-mode patch filter with independent control of center frequency and bandwidth (BW). The bandpass filter uses a single triangular resonator with two etched slots that split the fundamental degenerate modes and form the filter passband. Varactor diodes assembled across the slots are used to vary the frequency of each degenerate fundamental mode independently, which is feasible due to the nature of the coupling scheme of the filter. The varactor diode model used in simulations, their assembling, the dc bias configuration, and measured results are presented. The theory results are compared to the simulations and to measurements showing a very good agreement and validating the proposed methodology. The fabricated filter presents an elliptic response with 20% of center frequency tuning range around 3.2 GHz and a fractional BW variation from 4% to 12% with low insertion loss and high power handling with a 1-dB compression point higher than .

59 citations

Journal ArticleDOI
TL;DR: New methods to generate digital versions of classical analog waveforms with reduced aliasing are introduced and modifications to the digital nonlinear model of the Moog ladder filter are proposed.
Abstract: 19 Virtual analog synthesis refers to computational methods that imitate the sound production principles used in electronic music synthesizers of the 1960s and 1970s. In practice, it means digital subtractive synthesis. In this paper, we introduce new methods to generate digital versions of classical analog waveforms with reduced aliasing. We also propose modifications to the digital nonlinear model of the Moog ladder filter. These virtual analog synthesis techniques enable the production of retro sounds with modern computers.

59 citations

Patent
07 Nov 1996
TL;DR: In this paper, a low pass filter with a notch at 60 Hz and a bandpass filter which amplifies signals in a frequency range from 10-40 Hz has been presented for low-cost heart rate monitor.
Abstract: A convenient low-cost heart rate monitor. In one embodiment, a digital filter structure includes a low pass filter having a notch at 60 Hz and a bandpass filter which amplifies signals in a frequency range from 10-40 Hz and has a notch at 60 Hz. This digital filter has a recursive structure and uses integer coefficients to simplify and speed up the calculations. A four bit microcontroller may implement the digital filter. The output of the digital filter is subject to enhancement signal processing to emphasize QRS complexes indicative of human heartbeats.

59 citations

Journal ArticleDOI
TL;DR: In this paper, a class of linear phase digital filters is discussed for which the filter coefficients are simple functions of the parameters determining the desired frequency response, and the filters are variable over nearly the whole frequency range from zero to half the sampling frequency.

59 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented how to select tuning factor and quality factor in the design of a single-tuned passive harmonic filter and how to decide these two factors in order to avoid the side effect from off-tuning, the filter must be tuned on some preceded order not on exact order.
Abstract: This paper presents how to select tuning factor and quality factor in designing of a single-tuned passive harmonic filter. Tuning factor and quality factor must be considered before a decision of filter parameters(R, L and C). In literature, the study about these two factors has not been performed and only empirical values have been used in the passive harmonic filter design so far. As an empirical value, in cases of 5th and 7th filter, tuning order has been used 4.8th and 6.8th respectively and quality factor has been used in a range of 30 and 60; therefore, we will propose how to decide these two factors in this paper. If a single-tuned passive harmonic filter were off-tuned, its performance would be deteriorated substantially and resulted in a parallel resonance between grid inductance and filter capacitance. In order to avoid this side effect from off-tuning, the filter must be tuned on some preceded order not on the exact order. In other words, total filter impedance must have reactive impeda...

59 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202229
20201
20188
2017150
2016199