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Channel between upper and lower cutoff frequencies of a band system
telecommunications, the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies. It is usually
Center_frequency
Radio signal transmission method
communications. The frequency band is divided into smaller sub-bands. Signals rapidly change ("hop") their carrier frequencies among the center frequencies of these
Frequency-hopping spread spectrum
Frequency-hopping_spread_spectrum
Electronic method of transmitting information with a carrier wave
center frequency, has a functional relation to the modulating signal amplitude. Digital data can be encoded and transmitted using a form of frequency
Frequency_modulation
Physical characteristic of oscillating systems
force or vibration whose frequency matches a resonant frequency (or resonance frequency) of the system, defined as a frequency that generates a maximum
Resonance
Mathematical technique for manipulating signals
cycle (90 degrees or π/2 radians). All three sinusoids have the same center frequency. The two amplitude-modulated sinusoids are known as the in-phase (I)
In-phase and quadrature components
In-phase_and_quadrature_components
Changing the balance of frequency components in an audio signal
treble controls featuring fixed frequency centers and fixed levels of cut or boost. These filters worked over broad frequency ranges. Variable equalization
Audio_equalization
Frequency to which a carrier wave is shifted during transmission or reception
intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception. The intermediate frequency is
Intermediate_frequency
Wireless communication technology
represented by a cyclic shifted chirp over the bandwidth centered around the base frequency. The spreading factor (SF) is a selectable radio parameter
LoRa
standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of frequency channels numbered at 5 MHz spacing
List_of_WLAN_channels
of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most
List of channel numbers assigned to FM frequencies in North America
List_of_channel_numbers_assigned_to_FM_frequencies_in_North_America
Range of usable frequencies
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. It is typically measured in unit of hertz (symbol
Bandwidth_(signal_processing)
Radio system used by the U.S. armed forces
with frequency hopping by selecting more or less randomly a frequency for transmission of each pulse among the maximum defined 51 center-frequencies. To
Joint Tactical Information Distribution System
Joint_Tactical_Information_Distribution_System
Electronic testing device
analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument. The primary use is to measure the
Spectrum_analyzer
Tables of radio frequencies assigned to television channels
The following tables show the frequencies assigned to analog broadcast television channels in various regions of the world, along with the ITU letter
Television channel frequencies
Television_channel_frequencies
Device which extracts info from a modulated radio frequency current or voltage
a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first three decades of radio
Detector_(radio)
Frequency response boundary
electrical engineering, a cutoff frequency, corner frequency, or break frequency is a boundary in a system's frequency response at which energy flowing
Cutoff_frequency
Radio broadcast band
etc., there are 101 FM channels numbered from 200 (center frequency 87.9 MHz) to 300 (center frequency 107.9 MHz), though these numbers are rarely used
FM_broadcast_band
2 MHz-wide frequency band, spanning 87.8–108.0 MHz. This is divided into a total of 101 transmitting channels, each 200 kHz wide, with center frequencies of 87
FM broadcasting in the United States
FM_broadcasting_in_the_United_States
Signal with properties that vary cyclically with time
with center frequency f + α / 2 {\displaystyle f+\alpha /2} and the conjugate of the output of another one-sided bandpass filter with center frequency f
Cyclostationary_process
Operating signal for "request to communicate"
technique allows the other operators to zero-in as close to the caller's center frequency using the human ear to fine-tune their transceiver before engaging
CQ_(call)
Frequency band that spans one octave
frequency by frequency basis is possible, most often using Fourier transform analysis. If f c {\displaystyle \ f_{\mathsf {c}}\ } is the center frequency
Octave_band
Limits applied to the levels of radio transmissions
usually done with a band-pass filter, tuned to allow through the correct center frequency of the carrier wave, as well as all necessary sidebands. The spectral
Spectral_mask
Radio frequency allocations
Portugal, Serbia, Slovenia and Switzerland, the band 433.05–434.79 MHz (center frequency 433.92 MHz) is designated for ISM applications. Radio communication
ISM_radio_band
Electromagnetic spectrum, 3 Hz – 3000 GHz
the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are widely
Radio_spectrum
Geophysical method that uses radar pulses to image the subsurface
energy. The electrical conductivity of the ground, the transmitted center frequency, and the radiated power all may limit the effective depth range of
Ground-penetrating_radar
Channel access method used by various radio communication technologies
inspired by Manchester codes and enable a larger gap between the virtual center frequency and the subcarriers, which is not the case for OFDM subcarriers. The
Code-division_multiple_access
Modem standard
1) and 1700 Hz (FA) for space (typically a binary 0), and a 1500 Hz center frequency (F0). V.23 Mode 2 AFSK uses a 1300 Hz tone (FZ) for mark (typically
ITU-T_V.23
Measure used in digital signal processing
of a sound. It is sometimes called center of spectral mass. It is calculated as the weighted mean of the frequencies present in the signal, determined
Spectral_centroid
Electronic test instrument that averages an input according to the boxcar function
can be understood as sophisticated band pass filters with adjustable center frequency and bandwidth, the boxcar averager allows to define the signal of interest
Boxcar_averager
Radio spectrum band commonly used for broadcasting
until FM broadcasting came into vogue. Stations are allocated to center frequencies between 530 or 531 and 1600 kHz (1700 kHz in the Americas and Australia
Broadcast_band
Concept in radio transmission
of a frequency modulated signal, and the nominal center or carrier frequency. The term is sometimes mistakenly used as synonymous with frequency drift
Frequency_deviation
Filter that rejects signals inside a certain range
band-stop filter or band-rejection filter is a filter that passes most frequencies unaltered, but attenuates those in a specific range to very low levels
Band-stop_filter
filter quality by limiting the filter upper frequency to mere 4 kHz (genuine chips can specify center frequencies up to at least 20 kHz on the 6581 and 12 kHz
ReSID
Tool for digital signal processing
difference is that receivers also down-convert the subbands to a low center frequency that can be re-sampled at a reduced rate. The same result can sometimes
Filter_bank
Oscillator with frequency controlled by a voltage input
whose oscillation frequency is controlled by a voltage input. The applied input voltage determines the instantaneous oscillation frequency. Consequently,
Voltage-controlled_oscillator
U.S Low Power TV stations that also operate as FM radio stations
operations. All of these FM transmissions are authorized for operation on a center frequency of 87.75 MHz, generally designated by receiver and station marketing
Channel 6 radio stations in the United States
Channel_6_radio_stations_in_the_United_States
Russian global navigation satellite system
0 MHz, known as the L1 band. The center frequency is 1,602 MHz + n × 0.5625 MHz, where n is a satellite's frequency channel number (n=−6,...,0,...,6,
GLONASS
Number of occurrences in an experiment or study
In statistics, the frequency or absolute frequency of an event i {\displaystyle i} is the number n i {\displaystyle n_{i}} of times the observation has
Frequency_(statistics)
Code used in global cellular networks
In GSM cellular networks, an absolute radio-frequency channel number (ARFCN) is a code that specifies a pair of physical radio carriers used for transmission
Absolute radio-frequency channel number
Absolute_radio-frequency_channel_number
Radio transmission of audio by frequency modulation
in agreement with ANATEL. The frequency of an FM broadcast station (more strictly its assigned nominal center frequency) is usually a multiple of 100 kHz
FM_broadcasting
Rule in telecommunications
a carrier signal that is frequency modulated by a continuous or broad spectrum of frequencies rather than a single frequency. Carson's rule does not apply
Carson_bandwidth_rule
Hearing loss caused by an inner ear or vestibulocochlear nerve defect
lowest. For normal hearing people this is when the masker center frequency is closest to the frequency of the test signal (See Figure 9). In the case of dead
Sensorineural_hearing_loss
General term for variation of a characteristic
advanced radar waveform modulations – where the repetition rate or center frequency of a signal is changed in a repetitive fashion to reduce the probability
Wobulation
Type of radio receiver
incoming radio-frequency (RF) signals to a fixed intermediate frequency (IF). The signal is then amplified and filtered at that fixed frequency. This arrangement
Superheterodyne_receiver
Classification of power amplifier
the center frequency becomes less distorted. The residual distortion is dependent upon the bandwidth of the tuned load, with the center frequency seeing
Power_amplifier_classes
attenuation factor to account for in-tissue acoustic attenuation fc is the center frequency of the ultrasound pulse (MHz). MI is measured with a calibrated hydrophone
Mechanical_index
Mean amplitude of a waveform in the time domain
a radio transmitter, selection of the center frequency of the carrier wave is done with a DC bias. For frequency modulation (FM), the AC component is the
DC_bias
Form of sonar using post-processing of sonar data
Where R is the range, λ {\displaystyle \lambda } is the wavelength at center frequency and d is the along-track element size in the array. η {\displaystyle
Synthetic-aperture_sonar
Very low energy, short range radio precise positioning
signal bandwidth exceeds the lesser of 500 MHz or 20% of the arithmetic center frequency. Thus, pulse-based systems—where each transmitted pulse occupies the
Ultra-wideband
FM radio reception phenomenon
Modulation) transmitters share the same center frequency, the weaker signal will introduce distortions in form of beat frequencies or both signals interfere completely
Capture_effect
Type of radio antenna
antenna, the frequency range over which it maintains its gain and feedpoint impedance, is narrow, just a few percent of the center frequency, decreasing
Yagi–Uda_antenna
Analog circuit which filters an electronic signal using an amplifier
desired frequencies (the passband) together with the shape of the frequency response. This indicates the variety of filter (see above) and the center or corner
Active_filter
Satellite TV station identification protocol
the station is transmitting. The center frequency must be no more than 25 kHz from this nominal value and the frequency deviation must be no more than 25 kHz
Automatic Transmitter Identification System (television)
Automatic_Transmitter_Identification_System_(television)
characterization whereupon variation of the load impedance pulls the oscillation center frequency away from nominal. Source-pull is also used for noise characterization
Load_pull
Short "burst" or "envelope" of restricted wave action that travels as a unit
signal of a limited width in time or space requires many frequency components around a center frequency within a bandwidth inversely proportional to that width;
Wave_packet
Optical filter
A frequency-selective surface (FSS) is a thin, repetitive surface (such as the screen on a microwave oven) designed to reflect, transmit or absorb electromagnetic
Frequency_selective_surface
Measure used in psychoacoustics
filters can be approximated by the polynomial equation: where F is the center frequency of the filter, in kHz, and ERB( F ) is the bandwidth of the filter
Equivalent rectangular bandwidth
Equivalent_rectangular_bandwidth
Sound reinforcement for performers
parametric equalizer does not use fixed frequency bands. Instead, each frequency band can be adjusted. The center frequency can be adjusted over a several-octave
Stage_monitor_system
Linear filter
bt}\cos(2\pi ft+\phi ),\,} where f {\displaystyle f} (in Hz) is the center frequency, ϕ {\displaystyle \phi } (in radians) is the phase of the carrier,
Gammatone_filter
When perception of one sound is affected by another sound
signal frequency. A sharply tuned filter has good frequency resolution as it allows the center frequencies through but not other frequencies (Pickles
Auditory_masking
implementation of high-speed wireless TCP/IP data networks over amateur radio frequency allocations using commercial off-the-shelf (COTS) hardware such as 802
High-speed_multimedia_radio
order of the spline fb is a bandwidth parameter fc is the wavelet center frequency The Shannon wavelet (sinc wavelet) is then clearly a special case of
Fbsp_wavelet
Form of radar used to create images of landscapes
of one-third to one-half of its center frequency. For example, some systems use a bandwidth of about 1 GHz centered around 3 GHz. The two most common
Synthetic-aperture_radar
Signal processing technique for sensor arrays
radars, is one where the bandwidth is only a small fraction of the center frequency. With wideband systems this approximation no longer holds, which is
Beamforming
Former American amateur radio satellite
with an operating center frequency of 436.5 MHz, a bit rate of 9600 bit/s and 9 MB of message storage. NASA Goddard Space Flight Center. "PANSAT". NSSDCA
PANSAT
Resonator damping parameter
the resonant frequency) but have a smaller range of frequencies around that frequency for which they resonate; the range of frequencies for which the
Q_factor
Fiber-optic communications technology
its wavelength, whereas frequency-division multiplexing typically applies to a radio carrier, more often described by frequency. This is purely conventional
Wavelength-division multiplexing
Wavelength-division_multiplexing
White noise sound generating device
were more annoying than continuous ones, and that control over the center frequency and bandwidth was important in minimizing the annoyance of maskers
Tinnitus_masker
Auditory frequency metric
the critical band at any given frequency, not the exact values of the edges or centers of any band. To convert a frequency f (Hz) into Bark use: Bark =
Bark_scale
Hollow metal pipe used to carry radio waves
In radio-frequency engineering and communications engineering, a waveguide is a hollow metal pipe used to carry radio waves. This type of waveguide is
Waveguide_(radio_frequency)
Radio standard by ETSI
deployments. It uses the same Time Division slot timing and Frequency Division center frequencies and uses pre-transmit scanning to minimize co-channel interference
DECT-2020
Music not at expected frequency or pitch period
and is the base frequency around which it resolves to at the end. The base-frequency is usually called the harmonic or key center. Being on-key presumes
Off-key
Duration a communication channel's impulse response is effectively constant
f_{m}={\frac {v}{c}}f_{c}*2} with f c {\displaystyle f_{c}} being the center frequency of the emitter. Coherence time is actually a statistical measure of
Coherence time (communications systems)
Coherence_time_(communications_systems)
Electronic filter topology
_{{\omega _{0}}^{2}=(2\pi f_{0})^{2}}}}.} The center frequency f 0 {\displaystyle f_{0}} (i.e., the frequency where the magnitude response has its peak)
Sallen–Key_topology
Noise that reduces quantization error
This power limit can be increased by dithering the transmit optical center frequency, typically implemented by modulating the laser's bias input. See also
Dither
Information method in electromagnetic radiation
method of extracting information encoded as modulation of the phase, frequency or both of electromagnetic radiation in the wavelength band of visible
Optical_heterodyne_detection
Device for suppressing part of a signal
often, this means removing some frequencies or frequency bands. However, filters do not exclusively act in the frequency domain; especially in the field
Filter_(signal_processing)
Military unit
forums. Accesses satellites internationally. Obtains certification and frequency licenses to operate satellites, land mobile radios, emergency radio systems
Air Force Spectrum Management Office
Air_Force_Spectrum_Management_Office
Radio frequencies used in civil aviation
Airband or aircraft band is the name for a group of frequencies in the VHF radio spectrum allocated to radio communication in civil aviation, sometimes
Airband
1960s US Navy sonar research project
1440-element active array had a one megawatt acoustic output (180 dB) with a center frequency of 400 Hz. Though Artemis failed the final test and resulted in no
Project_Artemis
Signal processing operation
{T}{2}}\right)} for every frequency specification that the designer has control over (such as corner frequency or center frequency). This is called pre-warping
Bilinear_transform
Digital subscriber line technology
are frequency-division duplexed, the upstream and downstream transmit PSD masks are identical to those in ANSI T1.413. In RADSL, the baud rate, center frequency
Rate-Adaptive Digital Subscriber Line
Rate-Adaptive_Digital_Subscriber_Line
Short-time Fourier transform with variable resolution
This is shown below to be the integer number of cycles processed at a center frequency fk. As such, this somewhat defines the time complexity of the transform
Constant-Q_transform
Air traffic control facility
UHF (225 to 380 MHz) paired frequency used for military flights. In addition to radios to communicate with aircraft, center controllers have access to
Area_control_center
Gaussian-windowed wavelet
{\displaystyle f_{a}} is the pseudo frequency to scale a {\displaystyle a} , f c {\displaystyle f_{c}} is the center frequency and T {\displaystyle T} is the
Morlet_wavelet
simultaneously analyze the space and frequency characteristics of a signal. While the Fourier transform gives the frequency information of the signal, it is
Log_Gabor_filter
recorded off Madagascar, a two‐unit phrase, starts with 5–7 pulses with a center frequency of 35.1 ± 0.7 Hz and duration of 4.4 ± 0.5 s followed by a 35 ± 0 Hz
List_of_whale_vocalizations
Device for receiving radio transmissions
demodulation are done at the high frequency of the incoming radio signal. The bandwidth of a filter increases with its center frequency, so as the TRF receiver
Radio_receiver
Laser source with equal intervals of spectral lines
modulator driven by a radio-frequency source. In this manner, the frequency comb is centered around the optical frequency provided by the continuous-wave
Frequency_comb
Signal representation
engineering, and statistics, the frequency domain refers to the analysis of mathematical functions or signals with respect to frequency (and possibly phase), rather
Frequency_domain
Amateur telecommunications protocol
Olivia MFSK is an amateur radioteletype protocol, using multiple frequency-shift keying (MFSK) and designed to work in difficult (low signal-to-noise
Olivia_MFSK
Localized dielectric breakdown under high voltage stress
Transformer (HFCT) Bandwidth 500 kHz-50 MHz Ultrasonic microphone with center frequency 40 kHz Acoustic Contact Sensor with detection bandwidth 20 kHz - 300 kHz
Partial_discharge
Meter that displays the frequencies of an electronic signal
A frequency meter is an instrument that displays the frequency of a periodic electrical signal. Various types of mechanical frequency meters were used
Frequency_meter
Radio circuit
by a poorly controlled transmitter frequency, but the most common cause is drift of the center bandpass frequency of the receiver, due to thermal or mechanical
Automatic_frequency_control
Family of digital modulation methods
property is that the modulations are low-frequency/low-bandwidth waveforms compared to the carrier frequency, which is known as the narrowband assumption
Quadrature amplitude modulation
Quadrature_amplitude_modulation
Sound absorption performance of a material
the absorption of materials in eighteen one-third octave frequency bands with center frequencies ranging from 100 Hz to 5000 Hz. Absorption coefficients
Noise_reduction_coefficient
All-optical regenerator used in optical communications
applying another regeneration with the BPF center frequency placed at the original channel center frequency allows to overcome this problem. This can be
Mamyshev_2R_regenerator
Sound transmission method
time-exponentiated copy of the original signal to baseband and twice the original center frequency each time, with one iteration corresponding to one traversal of the
Sound_from_ultrasound
Sound-absorbing board
is recorded at octave or third-octave band center frequencies from 125 Hz to 4000 Hz. From these frequency-dependent values, a single-number rating can
Acoustic_panel
to Indian Trail-Lilburn Road. Frequency is 30 minutes peak to 60 minutes off peak. 40: Connecting Gwinnett Transit Center to the City of Lawrenceville
Gwinnett_Place_Transit_Center
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