Definitions

1. Frequency is a measure of the number of occurrences of a repeating event per unit time. (Web site)
2. Frequency: The number of cycles over a specified time period over which an event occurs. (Web site)
3. FreQuency is a music video game developed by Harmonix and published by SCEI. It was released in November 2001. (Web site)
4. FreQuency is a very addictive and fun game to play. (Web site)
5. Frequency is the measurement of the number of times that a repeated event occurs per unit time.

Frequencies

1. This is below the 6.75 MHz native frequency of the MPEG-2 digital signal. (Web site)
2. Frequencies below the cutoff frequency are reduced in amplitude to eliminate them. HIIP Host Image Independence Protocol.
3. Name Usage Frequency: JohnnyThe following table summarizes the usage of "Johnny" based on a population census conducted in the United States.
4. This loss of high-frequency information can show up as "ringing" or blurry spots along edges (called the Gibbs effect).
5. At the plasma frequency and above, dielectrics behave as ideal metals, with electron gas behavior.

Frequency Response

1. Chroma frequency response is one-half that of luma. (Web site)
2. AFM audio is limited in dynamic range and frequency response, and can include stereo and multi-track audio. AIFF Audio Interchange File Format.

Frequency Range

1. A system in which signals are each allocated a unique portion of a shared frequency range.
2. The answer is to determine the average value of all the amplitudes within a given frequency range.
3. Microwave The frequency range from approximately 1 to 300 GHz, covering the frequency range suitable for satellite communications.
4. Amplified music, motorcycles and machinery are sources of sound in this frequency range that often cause hearing loss after prolonged listening. (Web site)

Noise

1. The power spectral density of white noise is independent of frequency. (Web site)
2. It will "pick out" its resonant frequency from a complex excitation, such as an impulse or a wideband noise excitation.

Wave

1. The frequency of the carrier wave remains unchanged.
2. Radio-Frequency Links Communication links established by means of radio waves.
3. One of the principal methods for transmitting information using radio waves by superimposing the information signal onto a radio frequency carrier wave.

Radio

1. Radio The use of electromagnetic waves, lying in the radio frequency range, for communications purposes.
2. The purpose of this process is to reduce the potential of the signal to interfere with other radio frequency signals.
3. In physics and engineering disciplines, such as optics, acoustics, and radio, frequency is usually denoted by a roman letter f or by a greek letter -- (nu). (Web site)

Imaginary

1. At a given frequency, the imaginary part of leads to absorption loss if it is positive (in the above sign convention) and gain if it is negative.
2. The FFT is a complex quantity having real and imaginary values for every frequency point.

Applied Field

1. This frequency dependence reflects the fact that a material's polarization does not respond instantaneously to an applied field.
2. The size of the displacement current is dependent on the frequency ω of the applied field E; there is no displacement current in a constant field.

Oscillator

1. Heavily damped oscillators tend to have broad linewidths, and respond to a wider range of driving frequencies around the resonance frequency. (Web site)
2. Crystal oscillator An oscillator in which the frequency is controlled by a piezoelectric crystal.

Resonance

1. When the magnetic susceptibility is studied as a function of frequency, the permeability is a complex quantity and resonances can be seen.
2. The device used transmitters and receivers whose resonances were tuned to the same frequency, allowing communication between them. (Web site)

Abbreviation

1. MFSK: Abbreviation for multiple frequency-shift keying.
2. GFSK Abbreviation for Gaussian filtered frequency shift keying.

Frequency Signal

1. Downconversion The process of converting the frequency of a signal to a lower frequency.
2. Beacon A highly stable radio frequency signal, which is used by earth stations equipped with an automatically (satellite) tracking system.
3. The antenna must match the radio wave’s frequency so the signal will be strong.

Input Signal

1. De-Emphasis A reduction in the amplitude of the higher frequency portions of a frequency modulated signal (e.g.
2. The frequency of the carrier wave is varied in accordance with the time-varying amplitude of the input signal.
3. Out-of-Band Emission Any emission on a frequency or frequencies outside the bandwidth of a signal which results from the modulation process.
4. Carrier The basic radio, television, or telephony center of frequency transmit signal.
5. Often, this behaviour is described with a bode plot showing sensitivity error and phase shift as function of the frequency of a periodic input signal.

Counter

1. Attach a crystal microphone to the frequency counter and you have a guitar tuner. (Web site)
2. Such items use atomic resonance frequency standard in order to work their accuracy and feed the incorporated counter.

Sound

1. Acoustic spectroscopy involves the frequency of sound.
2. This value is known as the reference equivalent threshold sound pressure level (RETSPL) for the frequency in question. (Web site)
3. The pitch you hear depends on the frequency of the sound waves. (Web site)
4. This increases the frequency of the sound waves striking your ear. (Web site)

Harmonic

1. For AT-cut quartz crystals, overtone modes are at odd frequency harmonics.
2. Total Harmonic Distortion The RMS value of the distortion appearing at multiples of the input frequency to the RMS value of the input sine wave. (Web site)

Band

1. It is the frequency band occupied by an analogue or data signal prior to modulation and frequency conversion, or after frequency conversion and demodulation.
2. Each output delivers the signals received on one polarisation and in one frequency band.
3. B Band Switching The process of selecting one of two frequency bands (the "low band" or the "high band") for reception of satellite signals.
4. With short cables (lowcapacitance) and low output impedances, the corner frequency typically occurswell above the audio band. (Web site)

Spectrum

1. AMPS - allocates frequency ranges within the 800 and 900 Megahertz ( MHz) spectrum to cellular telephone. (Web site)
2. In regions of the spectrum where the material does not absorb, the real part of the refractive index tends to increase with frequency. (Web site)
3. Purple: frequency spectrum of hearing response.

Cycles

1. Household utility current in most countries is AC with a frequency of 60 hertz (60 complete cycles per second), although in some countries it is 50 Hz.
2. Frequency of Vibration: The number of cycles occurring in a given unit of time. (Web site)

Reactance

1. An alternating current has a time rate-of-change that is proportional to frequency and so the inductive reactance is proportional to frequency.
2. Capacitive reactance is inversely proportional to the signal frequency and the capacitance .

Angular Frequency

1. In SI units, angular frequency is measured in radians per second, with dimensions T −1 since radians are dimensionless.
2. The angular frequency is most known in the simple harmonic motion equation (shm).

Vibrate

1. Oscillation mode A quartz crystal is designed to vibrate on its fundamental frequency or one of its overtones.
2. Cochlea A snail shaped mechanism in the inner ear that contain hair cells of basilar membrane that vibrate to aid in frequency recognition. (Web site)

High Frequency

1. As the frequency increases, the inductive reactance increases so that an inductor approaches an open circuit for very high frequency sinusoidal sources.
2. Note: High frequency (HF) modems are limited to operation over a voice channel with a nominal 3-kHz bandwidth.

High-Frequency

1. At the high-frequency limit, the complex permittivity is commonly referred to as ε ∞.
2. It corresponds in the frequency domain to a high-pass filter, which means that high-frequency noise is amplified. (Web site)
3. Aliasing The erroneous interpretation of high-frequency signals as lower-frequency signals. (Web site)

Frequency

1. For example, at the microwave frequency, the microwave field causes the periodic rotation of water molecules, sufficient to break hydrogen bonds.
2. Note: Phase and frequency modulation are particular forms of angle modulation. (Web site)
3. Thus, all of the voltages and currents in the circuit are sinusoidal and have constant peak amplitude, frequency and phase.
4. G gigahertz (GHz) Unit of frequency equal to 1,000,000,000 Hz.
5. Perceived pitch is dependent on frequency, waveform and amplitude or changing amplitude. (Web site)

Categories

1. Encyclopedia of Keywords > Information > Science > Physics
2. Perception > Senses > Hearing > Sound
3. Encyclopedia of Keywords > Thought
4. Mathematics > Equations > Differential Equations > Waves
5. Encyclopedia of Keywords > Nature > Matter > Materials

Subcategories

Megahertz

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