Resonant frequency - Music Sage

Resonant frequency - Music Sage

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Topic: Resonant frequency

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Pickup secrets by Helmuth E. W. Lemme

Since different guitar cables have different amounts of capacitance, it is clear that using different guitar cables with an unbuffered pickup will change the resonant frequency and hence the overall sound.
If you know the resonant frequency and height of the resonant peak, you know about 90 percent of a pickup's transfer characteristics; these two parameters are the key to the "secret" of a pickup's sound (some other effects cannot be described using this model, but their influence is less important).
A vibrating string induces an alternating voltage at the frequency of vibration, where the voltage is proportional to the velocity of the strings motion (not its amplitude).

http://www.buildyourguitar.com/resources/lemme



Resonance - Wikipedia, the free encyclopedia

Violin (or harp, guitar, piano, etc.) strings have a fundamental resonant frequency directly related to the length and tension of the string.
In an electrical circuit, resonance occurs at a particular frequency when the inductive reactance and the capacitive reactance are of equal magnitude, causing electrical energy to oscillate between the magnetic field of the inductor and the electric field of the capacitor.
Resonance is an important consideration for instrument builders as most acoustic instruments use resonators, such as the strings and body of a violin, the length of tube in a flute, and the shape of a drum membrane.

http://en.wikipedia.org/wiki/Resonance



NOVA Elegant Universe Resonance in Strings PBS

Each resonant pattern is a multiple of the fundamental frequency: The fundamental is half of a complete wave, the second harmonic is a complete wave, the third harmonic is one and a half waves, and the fourth harmonic is two waves.
This is the string's fundamental resonant pattern, or frequency.
The body of the violin has resonant frequencies, which work to amplify the sound created by the vibrating string.

http://www.pbs.org/wgbh/nova/elegant/resonance.html



Banjo Drum Head Tuning

It would appear that the increase in resonant frequency, as the drum head is tightened, asymptotically approaches some maximum value dictated by the yield tensile strength.
The resonant frequency is now approximately 273.78 Hertz or approximately a C# We came up only two half-steps from the previous case.
The resonant frequency is now approximately 210.58 Hertz or a G# We came up only 4 half-steps from the previous case.

http://www.astroshow.com/banjo/banjohead.html



strings, quarks, and resonant frequencies.

In protons and neutrons, do up/down quarks and gluons share a common resonant frequency or multiple thereof?
[ Follow Ups ] [ Post Followup ] [ String and M Theory Duality X ] [ FAQ ]
[ String Theory Home ] [ Forum Index ]

http://www.superstringtheory.com/forum/dualboard/messages10/151.html



Patent 5065138: Magnetically-coupled two-resonant-circuit, frequency divider for presence-detection-system tag

The first resonant circuit 70 is resonant at a first frequency f.sub.1 for receiving electromagnetic radiation at the first frequency f.sub.1 ; and the second resonant circuit 74 is resonant at a second frequency f.sub.2 that is one-half the first frequency f.sub.1 for transmitting electromagnetic radiation at the second frequency f.sub.2.
The first resonant circuit 80 is resonant at a first frequency f.sub.1 for receiving electromagnetic radiation at the first frequency f.sub.1 ; and the second resonant circuit 84 is resonant at a second frequency f.sub.2 that is one-half the first frequency f.sub.1 for transmitting electromagnetic radiation at the second frequency f.sub.2.
The first circuit 80 is coupled only magnetically by the ferrite rod 82 and air to the second circuit 84 to transfer energy to the second circuit 84 in response to receipt by the first circuit 80 of electromagnetic radiation at the first frequency f.sub.1.

http://www.freepatentsonline.com/5065138.html



Resonant Vs Natural Frequency -

resonant frequency (~ 0.01 Hz) and at increasing...
The form of the diagram is a rectangular plot of resonant frequency (y-axis) vs excitation frequency...
The forcing frequency is not necessarily equal to the natural or resonant frequency of the mass-spring system...

http://frequency.fqup.com/index.php?k=resonant-vs-natural-frequency



28943.990610&ELEMENT_SET=DECL

A second harmonic resonant cavity 19 is located between the first two inductively tuned intermediate cavities 16 and 17 and is capacitively tuned to the electron beam being resonant at a frequency which is slightly less than twice the fundamental frequency.
An electron beam tube of a type wherein a plurality of electron bunches are formed, the tube comprising: an output resonant cavity from which an output signal is extracted; and a penultimate resonant cavity inductively tuned near a harmonic of the fundamental frequency, the penultimate cavity being partially extensive within the output cavity.
Following this input arrangement, a penultimate resonant cavity 29 is tuned to be resonant at slightly greater than two times the fundamental frequency and its output is delivered to an output cavity 30 which is resonant at the fundamental frequency.

http://www.wipo.int/cgi-pct/guest/getbykey5?KEY=99/28943.990610&ELEMENT_SET=DECL (2144 words)



FindChips.com Search

SERIES:IMCH; INDUCTANCE:1.8UH; INDUCTANCE TOLERANCE:+/-10 PERCENT; PACKAGE/CASE:1812; TERMINAL TYPE:SURFACE MOUNT; Q FACTOR:10; SELF RESONANT FREQUENCY:100MHZ; CURRENT RATING:900MA; PACKAGING:CUT TAPE; MOUNTING TYPE:SURFACE MOUNT; RESISTANCE:160MOHM
SERIES:IMCH; INDUCTANCE:5.6UH; INDUCTANCE TOLERANCE:+/-10 PERCENT; PACKAGE/CASE:1812; TERMINAL TYPE:SURFACE MOUNT; Q FACTOR:10; SELF RESONANT FREQUENCY:30MHZ; CURRENT RATING:650MA; PACKAGING:CUT TAPE; MOUNTING TYPE:SURFACE MOUNT; RESISTANCE:300MOHM
SERIES:ISC-1812; INDUCTANCE:100NH; INDUCTANCE TOLERANCE:20 PERCENT; PACKAGE/CASE:1812; TERMINAL TYPE:SURFACE MOUNT; Q FACTOR:30; SELF RESONANT FREQUENCY:460MHZ; CURRENT RATING:552MA; PACKAGING:CUT TAPE; MOUNTING TYPE:SURFACE MOUNT

http://www.findchips.com/avail?part=inductance (2144 words)



Inductor's Equivalent Circuit Yields True Picture of Losses

For instance, at a frequency of 1/20 the self-resonant frequency the inductance is increased by 0.25%, 1/10 of self-resonant frequency 1%, 1/5 the self-resonant frequency 4% and finally at ½ the self-resonant frequency the inductance is increased 25%.
At the self-resonant frequency, the phase angle of the impedance is zero and the impedance it presents to the circuit is a maximum.
As the frequency is further increased, the phase angle by which the current leads the voltage increases.

http://www.powerelectronics.com/mag/power_inductors_equivalent_circuit/index.html (2144 words)



Electrical Principles

E5A15 (D)What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 21.15 MHz and a Q of 95?
E5A14 (A)What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 14.25 MHz and a Q of 150?
E5G04 (B)What is the Q of a parallel R-L-C circuit if the resonant frequency is 7.125 MHz, L is 12.6 microhenrys and R is 22 kilohms?

http://www.craigr.com/subelement5.htm (2144 words)



Resonance

For example, suppose the TV or radio station you want to see or hear is broadcasting at the resonant frequency.
; this frequency is known as the RESONANT FREQUENCY.
(in a given circuit) is known as the resonant frequency of that circuit.

http://www.tpub.com/neets/book9/34b.htm (808 words)



Calculating Elastic Constants

The main thing to remember is that for bars (rectangular, cylindrical), the shear modulus, G, is determined from the fundamental torsional resonant frequency, and the Young's modulus, E, is determined from either the fundamental flexural resonant frequency, or the fundamental longitudinal resonant frequency.
These resonant frequency values are a little inaccurate (µ = 0.112, E = 413 GPa) and can be improved by tweaking them to 20120 Hz and 12980 Hz respectively (µ = 0.208 and E = 400 GPa).
It is clear that the longitudinal resonant frequency can not be measured using a standard Power Macintosh in this case.

http://www.buzzmac.com/manuals/bsmac/Calculating_E.html (808 words)



Resonance

In sound applications, a resonant frequency is a natural frequency of vibration determined by the physical parameters of the vibrating object.
A vibrating object will pick out its resonant frequencies from a complex excitation and vibrate at those frequencies, essentially "filtering out" other frequencies present in the excitation.
A child's playground swing is an example of a pendulum, a resonant system with only one resonant frequency.

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/reson.html#resdef (308 words)



16163.990401&ELEMENT_SET=DECL

The switched-mode power supply of the invention operates on the series resonant converter principle and it comprises a first capacitor on the primary side to which both a voltage modulated at the mains frequency and a voltage modulated at the switching frequency of the switched-mode power supply are applied.
Switched-mode power supply according to Claim 9, characterized in that a coil (L31) which influences the frequency and two capacitors (C18, C19) which are connected as a voltage divider and influence the frequency are arranged in the series resonant circuit.
Switched-mode power supply for a device having a normal mode and a low-power mode, for example a standby mode, characterized in that the switched-mode power supply operates as a series/parallel resonant converter, whose resonant frequency in the normal mode is governed essentially by the series resonant circuit

http://www.wipo.int/cgi-pct/guest/getbykey5?KEY=99/16163.990401&ELEMENT_SET=DECL (4378 words)



Cylindrical, Single-Layer, Air-Cored Coils of Various Proportions - Page 1

Computed self-resonant frequency is the value with the coil isolated, i.e., not within several coil diameters plus a coil length of any other material, either conducting or insulating.
As the operating frequency nears the coil's self-resonant frequency the circuit Q rapidly falls.
Output data: Inductance, reactance, self-capacitance, self-resonant frequency, loss resistance, Q, capacitance to tune to test frequency, resonant impedance at test frequency and power dissipated for a given RF voltage across coil.

http://www.smeter.net/electronics/solnoid3.php (4378 words)



FractalComs

A close look at the results reveals that the resonant frequency of a Koch monopole is higher than that of a straight monopole of the same wire length and the reduction factor in the resonant frequency of the Koch antenna as the iteration number increases tends monotonically to one.
This work investigates further in the dependence of the resonant frequency with the monopole geometry, in order to acquire guidelines for the design of self-resonant small antennas, in which an increase of the wire length effectively leads to a reduction in the resonant frequency.
All of the monopoles are designed as self-resonant antennas, so they do not need any external load to cancel out the reactive part of their input impedance.

http://www-tsc.upc.es/fractalcoms/t11.htm (3079 words)



Patent 4810968: Magnetic resonance imaging apparatus comprising a pin diode uncoupled detection coil

A circuit as claimed in claim 1 further comprising a varicap diode coupled to the resonant circuit so as to adjust the resonant frequency thereof, and a third pin diode switch coupling the varicap diode to a source of control voltage for tuning the frequency of the resonant circuit via said varicap diode.
An apparatus as claimed in claim 8 further comprising a varicap diode coupled to the resonant circuit so as to adjust the resonant frequency thereof, and a third pin diode switch coupling the varicap diode to a source of control voltage for tuning the frequency of the resonant circuit via said varicap diode.
The diodes D1 and D2 or D3 and D4, being connected in series with the capacitors C6 and C5, respectively, form a short circuit for the comparatively high RF currents generated in the active state of the transmitter coil, so that the varicaps DCT and DCM are actually short-circuited.

http://www.freepatentsonline.com/4810968.html (3079 words)



Q factor - Wikipedia, the free encyclopedia

The optical Q is equal to the ratio of the resonant frequency to the FWHM bandwidth of the cavity resonance.
The Q factor or quality factor is a measure of the "quality" of a resonant system.
In optics, the Q factor of a resonant cavity is given by

http://en.wikipedia.org/wiki/Q_factor (436 words)



resonance

In a series resonant circuit the impedance is at its lowest for the resonant frequency whereas in a parallel resonant circuit the impedance is at its greatest for the resonant frequency.
As the circuit departs from its resonant frequency, up or down, it presents a lessening impedance and progressively allows other signals to leak to ground.
At resonance that circuit presents such a high impedance to the resonant circuit to the extent it is almost invisible and the signal passes by.

http://www.electronics-tutorials.com/basics/resonance.htm (436 words)



Piezoelectricity

The vibration frequency is chosen to be the resonant frequency of the block, typically in the 100 kilohertz to 1 megahertz range.
In most piezoelectric motors the piezoelectric crystal is excited by a sine wave signal at the resonant frequency of the motor.
An extra feature of this transformer is that, by operating it above its resonant frequency, it can be made to appear as an inductive load, which is useful in circuits that require a controlled soft start.

http://www.sciencedaily.com/encyclopedia/piezoelectricity (436 words)



Self-Resonant Frequency of Single-Layer Solenoid Coils

The only accurate numerical results of this program are the self-resonant frequency of the coil in free space and the resonant frequency of the coil with open circuit leads connected, neither of which exists in practice because the leads, whatever their length, must be connected to the remainder of a more complicated circuit.
The calculated resonant frequency with leads connected to the coil occurs when the line is cut and the resulting short leads are open circuited at their outer ends.
It is necessary to calculate the approximate self-resonant frequency of the coil and the range of frequencies over which the choke impedance is high enough to be effective in a particular wideband application.

http://www.smeter.net/feeding/selfres3.php (436 words)



Machina Dynamica Nimbus Sub-Hertz Platform

Recall that isolation cannot occur for vibration with frequencies below the device's resonant frequency and that vibration with frequencies above the resonant frequency are subject to the gradual attenuation behavior of the mechanical low-pass filter.
The majority of sesimic energy is in the frequency range 0-10 Hz; unfortunately, the resonant frequencies of nearly all isolation devices (outside of certain laboratories) aren't low enough to be all that effective for vibrations in this critical 0-10 Hz range.
The resonant frequency in the vertical direction is around 2 Hz, in the horizontal plane around 1 Hz.

http://www.machinadynamica.com/machina24.htm (436 words)



FVR_SPITFIRE_FAQ.DOC

This frequency is the resonant frequency of the element.
First tune the director to the required resonant frequency by adjusting the length of the bottom horizontal segment until the correct resonant frequency is measured.
RESONANT FREQUENCIES * You wrote that on 160m the Reflector should be tuned to 1.90 MHz and the Director to 2.0 MHz....

http://www.yccc.org/Articles/Spitfire/FVR_SPITFIRE_FAQ.DOC (436 words)



Measuring Impulse Excited Solids

To excite the flexural resonant frequency, the disc was tapped lightly in the center (figure 12.3 A).
Details of how to measure the resonant frequency of specific shapes (rectangular bars, cylinders, and discs) are discussed in the remainder of this chapter.
A better method to show the flexural and torsional resonant frequencies in a single spectrum, is to excite both resonant frequencies by tapping in between the two positions shown in figures 12.3 A and 12.3 B (figure 12.7).

http://www.buzzmac.com/manuals/bsmac/Measuring_Solids.html (436 words)



Frequency Counter Methods

The resonant frequency of the cavity is varied by means of a plunger that is mechanically connected to a micrometer mechanism.
The meter is adjusted until the cavity is tuned to the resonant frequency of the signal being measured.
Frequency meters are capable of measuring frequencies in the range of 1 to 40 gigahertz, far exceeding the frequency limitations of the average frequency counter.

http://www.tpub.com/neets/book21/88f.htm (1661 words)



(WO 03/090162) RESONANT CONTROLLED QUBIT SYSTEM

In the method, a resonant control system, which is capacitively coupled to the first and second qubit, is tuned to a first frequency that corresponds to the energy differential between the lowest two potential energy levels of the first qubit.
The resonant control system is then adjusted to a second frequency corresponding to energy differential between the lowest two potential energy levels of the second qubit.
The resonant frequency of the control system is a function of a bias current.

http://wipo.int/ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/90162.031030&... (1661 words)



General Questions

Usually, the resonant frequencies of electrons are higher than the frequency of visible light, and so low frequency light (red) will go faster than high frequency (blue).
Now if the frequency of light is very different from the resonant frequency of the atom, then the electron will only oscillate a little.
One can think of an electrons in an atom as a mass on a spring; if you were to pull and let go, it would oscillate at some resonant frequency, which is determined by the mass and the spring.

http://olbers.kent.edu/alcomed/Ask/nlc2.html (1661 words)



Resonance

In sound applications, a resonant frequency is a natural frequency of vibration determined by the physical parameters of the vibrating object.
A child's playground swing is an example of a pendulum, a resonant system with only one resonant frequency.
The blow with the stick is a complex excitation with many frequency components (as could be shown by Fourier analysis), but the spring picks out its natural frequency and responds to that.

http://230nsc1.phy-astr.gsu.edu/hbase/sound/reson.html (1661 words)



Antenna (radio) - Wikipedia, the free encyclopedia

The bandwidth of an antenna is the range of frequencies over which it is effective, usually centered around the resonant frequency.
Typically an antenna is tuned for a specific frequency, and is effective for a range of frequencies usually centered on that resonant frequency.
However, the other properties of the antenna (especially radiation pattern and impedance) change with frequency, so the antenna's resonant frequency may merely be close to the center frequency of these other more important properties.

http://www.bonneylake.us/project/wikipedia/index.php/Antenna_(electronics) (1661 words)