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Stable oscillator used for frequency calibration or reference
A frequency standard is a stable oscillator used for frequency calibration or reference. A frequency standard generates a fundamental frequency with a
Frequency_standard
Primary frequency standard
The caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133
Caesium_standard
Pitch standard
is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A4
A440_(pitch_standard)
Standards in electronics and telecommunications
secondary frequency standard is a frequency standard that does not have inherent accuracy, and therefore must be calibrated against a primary frequency standard
Secondary_frequency_standard
Radiocommunication service for scientific and other purposes
Standard frequency and time signal service (short: SFTS) is, according to Article 1.53 of the International Telecommunication Union's (ITU) Radio Regulations
Standard frequency and time signal service
Standard_frequency_and_time_signal_service
Frequency standard
A rubidium standard or rubidium atomic clock is a frequency standard in which a specified hyperfine transition of electrons in rubidium-87 atoms is used
Rubidium_standard
Data communications modulation protocol
Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is encoded on a carrier signal by periodically shifting the
Frequency-shift_keying
different frequency bands. Frequency Range 1 (FR1) originally includes sub-6 GHz frequency bands, some of which are traditionally used by previous standards, and
5G_NR_frequency_bands
Part of the NPL which maintains and calibrates Indian Standard Time
and Frequency Standards Laboratory is a part of the National Physical Laboratory in New Delhi which maintains and calibrates the Indian Standard Time
Time and Frequency Standards Laboratory
Time_and_Frequency_Standards_Laboratory
Time zone observed in India; UTC+05:30
System satellite-based standard time and frequency broadcast service, which offers IST correct to ±10 microsecond and frequency calibration of up to ±10−10
Indian_Standard_Time
The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of frequency channels numbered
List_of_WLAN_channels
Effect that limits performance of advanced atomic clocks
microwave and optical frequency standards, as well as in the development of methodologies for atomic-wave interferometry, frequency standard comparison, and
Dick_effect
Reference point for tuning musical instruments
The ISO defines international standard pitch as A440, setting 440 Hz as the frequency of the A above middle C. Frequencies of other notes are defined relative
Concert_pitch
Electromagnetic frequencies ranging from 3 kHz to 300 GHz
frequencies of 30 GHz and above are designated millimeter wave. More detailed band designations are given by the standard IEEE letter- band frequency
Radio_frequency
Number of occurrences or cycles per unit time
Frequency is the number of occurrences of a repeating event per unit of time. Frequency is an important parameter used in science and engineering to specify
Frequency
Clock that monitors the resonant frequency of atoms
establishing a global optical-time standard. Optical atomic clocks are enabling new applications: ultra-precise time- and-frequency dissemination, improved global
Atomic_clock
Temperature-controlled chamber for a quartz crystal
stability requires switching to an atomic frequency standard, such as a rubidium standard, caesium standard, or hydrogen maser. Another cheaper alternative
Crystal_oven
Musical notation system to describe pitch and relative frequency
showing which octave they are part of. For standard A440 pitch equal temperament, the system begins at a frequency of 16.35160 Hz, which is assigned the value
Scientific_pitch_notation
Atomic clock used for US time standard
along with NIST-F1, serves as the United States' primary time and frequency standard. NIST-F2 was brought online on 3 April 2014. NIST-F1, a cesium fountain
NIST-F2
Electric charge generated in certain solids due to mechanical stress
drives. The piezoelectrical properties of quartz are useful as a standard of frequency. Quartz clocks employ a crystal oscillator made from a quartz crystal
Piezoelectricity
Device used as a frequency standard
hydrogen frequency standard, is a specific type of maser that uses the intrinsic properties of the hydrogen atom to serve as a precision frequency reference
Hydrogen_maser
SI unit of frequency
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle)
Hertz
Clock type
Quartz Frequency Standards – Aging". Archived from the original on 2021-07-10. Retrieved 2021-07-10. "Introduction to Quartz Frequency Standards - Aging"
Quartz_clock
SI unit of time
Physical Laboratory (2005) National Research Council of Canada: Optical frequency standard based on a single trapped ion NIST: Definition of the second; notice
Second
Electronic oscillator circuit
circuit that uses a piezoelectric crystal as a frequency-selective element. The oscillator frequency is often used to keep track of time, as in quartz
Crystal_oscillator
Laser source with equal intervals of spectral lines
A frequency comb or spectral comb is represented by a spectrum made of discrete, stable and regularly spaced spectral lines. In optics, a frequency comb
Frequency_comb
Sound whose frequency is audible to the average human
An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz
Audio_frequency
This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone
Piano_key_frequencies
Frequency used on standard electricity grid in a given area
The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating
Utility_frequency
Atomic clock
Institute of Standards and Technology (NIST) in Boulder, Colorado, and served as the United States' primary time and frequency standard. The clock took
NIST-F1
Data network that uses electrical wiring
distance limits vary widely over many power-line communication standards. Low-frequency (about 100–200 kHz) carriers impressed on high-voltage transmission
Power-line_communication
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
Simultaneous observation method
mechanism between time bureaux to determine and distribute time and frequency standards. As of 2003[update] TWSTFT is being evaluated as an alternative to
Two-way satellite time and frequency transfer
Two-way_satellite_time_and_frequency_transfer
Ultra high frequency radio bands assigned to mobile devices
introduce new standards, often based on other frequencies. Some European countries (and Japan) adopted TACS operating in 900 MHz. The GSM standard, which appeared
Cellular_frequencies
International Telecommunication Union-approved frequency bands for GSM
GSM frequency bands or frequency ranges are the cellular frequencies designated by the ITU for the operation of GSM mobile phones and other mobile devices
GSM_frequency_bands
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
Wireless network standard
IEEE 802.11 uses various radio frequencies, including, but not limited to, 2.4 GHz, 5 GHz, 6 GHz, and 60 GHz frequency bands. Although IEEE 802.11 specifications
IEEE_802.11
Longwave and mediumwave radio transmitter in England
power is currently 500 kilowatts. The carrier frequency is controlled by a rubidium atomic frequency standard in the transmitter building, enabling the transmission
Droitwich Transmitting Station
Droitwich_Transmitting_Station
Specification of precise musical pitch
and a tuning message for individual notes as they are played. If f is a frequency in hertz, then the corresponding MIDI note number NMIDI is given by the
MIDI_tuning_standard
Rate of change of angle
position. Using standard frequency f, this equation would be a = − ( 2 π f ) 2 x . {\displaystyle a=-(2\pi f)^{2}x.} The resonant angular frequency in a series
Angular_frequency
Device for producing coherent EM waves in the sub-visible spectrum
as an atomic frequency standard. Together with other kinds of atomic clocks, these help make up the International Atomic Time standard ("Temps Atomique
Maser
Device that generates sounds of constant pitch when struck
most of the vibrational energy at the fundamental frequency. The reason for this is that the frequency of the first overtone is about 52/22 = 25/4 =
Tuning_fork
Fundamental quantity in physics
nanoseconds/day. Development of increasingly accurate frequency standards is underway. In this time and frequency standard, a population of caesium atoms is laser-cooled
Time_in_physics
Audio frequencies used for the transmission of speech
voice frequency (VF) or voice band is the range of audio frequencies used for the transmission of speech. In telephony, the usable voice frequency band
Voice_frequency
Science of the measurement of time
unit of measurement for time and the establishment of time standards and frequency standards as well as their dissemination. Early humans would have used
Chronometry
Primary time standard globally used to regulate clocks and time
coordination of time and frequency transmissions around the world began on 1 January 1960. UTC was first officially adopted as a standard in 1963 and "UTC" became
Coordinated_Universal_Time
National Time and Frequency Standard Laboratory. Retrieved 2013-02-14. "Current activities of the National Standard Time and Frequency Laboratory of the
List_of_atomic_clocks
Circuit that creates new frequencies from two signals
In electronics, a mixer or frequency mixer is a circuit that outputs signals with new frequencies from two signals input to it. In its most common application
Frequency_mixer
daylight saving time. The official time signal is given by the Time and Frequency Standards Laboratory in New Delhi. The IANA time zone database mentions the
Time_in_India
Radio signal transmission method
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many frequencies occupying
Frequency-hopping spread spectrum
Frequency-hopping_spread_spectrum
Electronic devices that generate electronic signals
a frequency range of 500 Hz to 1.5 MHz. Also, in April 1929, the first commercial frequency standard was marketed by General Radio with a frequency of
Signal_generator
American shortwave time signal radio station
government frequency standards, with transmitters operating on 2.5, 5, 10, 15, 20, and 25 MHz. WWV is operated by the U.S. National Institute of Standards and
WWV_(radio_station)
Type of adjustable-speed drive
A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable
Variable-frequency_drive
Satellite navigation system
band in the navigation payload and will use Indian Rubidium Atomic Frequency Standard (iRAFS.) This introduction of the new L1 band will help facilitate
Indian Regional Navigation Satellite System
Indian_Regional_Navigation_Satellite_System
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)
Instrument for measuring, keeping or indicating time
(2001). "Time and frequency measurement at NIST: The first 100 years" (PDF). Time and Frequency Division, National Institute of Standards and Technology
Clock
single time standard. A process in which network synchronization is achieved by the use, at all nodes, of oscillators that adjust their frequencies to the
Frequency_averaging
3–30 MHz range of the electromagnetic spectrum
High frequency (HF) is the ITU designation for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter
High_frequency
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
SI derived unit of voltage
using the Josephson effect for exact frequency-to-voltage conversion, combined with the caesium frequency standard. Though the Josephson effect is still
Volt
Measure of variation in statistics
statistics, the standard deviation is a measure of the amount of variation of the values of a variable about its (arithmetic) average. A low standard deviation
Standard_deviation
standardized mains supply voltages and frequencies are defined in IEC 60038. In a 1997 amendment, the old standard values of 220/380 V (single-phase/three-phase)
Mains_electricity_by_country
Electronic tracking technology
Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists
Radio-frequency identification
Radio-frequency_identification
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
French longwave broadcast transmitter
convenient frequency standard. In 1980, the first atomic clock was installed to regulate the carrier frequency. On 1 February 1986, the frequency was changed
Allouis_longwave_transmitter
Radio transmission using wavelengths above 1000 m
10 kW BPC in Shangqiu, China, 68.5 kHz, 90 kW MSF time and 60 kHz frequency standard transmitted from Anthorn in the UK, 17 kW ERP. ALS162 from Allouis
Longwave
Telecommunication signaling system
Dual-tone multi-frequency (DTMF) signaling is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone
DTMF_signaling
Concept in radio transmission
or 5 kHz spacing). Frequency modulation Carson bandwidth rule This article incorporates public domain material from Federal Standard 1037C. General Services
Frequency_deviation
Emergency locator rescue radio beacon
2.275 kHz. In 1986, the international frequency standard of 457 kHz was adopted, and this remains the standard today. Many companies manufacture transceivers
Avalanche_transceiver
Specification for measuring time
Atomic clock Clock synchronization Clock signal Epoch (astronomy) Frequency standard Radio clock Time in astronomy Time signal Time metrology Time transfer
Time_standard
Canadian-American feminist media critic (born 1983)
Canadian-American feminist media critic. She is the founder of Feminist Frequency, a website that hosts videos and commentary analyzing portrayals of women
Anita_Sarkeesian
American shortwave time signal radio station
frequency standard. Due to ionospheric conditions, at certain times and locations some listeners may receive both WWV and WWVH on the same frequency at
WWVH
Standard formats for transferring time information
commonly known as IRIG timecode, are standard formats for transferring timing information. Atomic frequency standards and GPS receivers designed for precision
IRIG_timecode
Official time zone of Hong Kong
tolerance down to less than 1 millisecond. The frequency standard of the clock is based on the primary standard used by Japan's Communications Research Laboratory
Hong_Kong_Time
Method of encoding digital data on multiple carrier frequencies
In telecommunications, orthogonal frequency-division multiplexing (OFDM) is a type of digital transmission used in digital modulation for encoding digital
Orthogonal frequency-division multiplexing
Orthogonal_frequency-division_multiplexing
telecommunications, the term critical frequency has the following meanings: In radio propagation by way of the ionosphere, the frequency at or below which a wave component
Critical_frequency
Estimate of the importance of a word in a document
In information retrieval, tf–idf (term frequency–inverse document frequency, TF*IDF, TFIDF, TF–IDF, or Tf–idf) is a measure of importance of a word to
Tf–idf
Measure of frequency stability in clocks and oscillators
white frequency noise and f − 3 {\displaystyle f^{-3}} flicker frequency noise respectively. These noise forms have the effect that the standard variance
Allan_variance
Detail of the global positioning system
signal's carrier wave in addition to the standard code phase measurement. Because the carriers are at a higher frequency (1.18–1.58 GHz), performing phase measurements
Error analysis for the Global Positioning System
Error_analysis_for_the_Global_Positioning_System
Electronic method of transmitting information with a carrier wave
Frequency modulation (FM) is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In
Frequency_modulation
(Orthogonal Frequency Division Multiplexing) GPRS HSPA D and U standards. Lorawan LTE RTT UMTS over W-CDMA UMTS-TDD WiMAX: 802.16 standard Narrowband IoT
List of wireless network protocols
List_of_wireless_network_protocols
Highest radio frequency that can be used for skywave radio transmission
In radio transmission, maximum usable frequency (MUF) is the highest radio frequency that can be used for transmission between two points on Earth by reflection
Maximum_usable_frequency
Frequency response curves used in sound pressure level measurement
A-weighting is a form of frequency weighting and the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various
A-weighting
System used to generate stable voltages, that may be used to define a volt
stable voltages that depend only on an applied frequency and fundamental constants. It is an intrinsic standard in the sense that it does not depend on any
Josephson_voltage_standard
American physicist and electrical engineer
as frequency standards, in 1922 published an IRE paper on this application, and in 1923 made the first direct international comparison of frequency standards
Walter_Guyton_Cady
300–3000 kHz range of the electromagnetic spectrum
Medium frequency (MF) is the ITU designation for radio frequencies (RF) in the range of 300 kilohertz (kHz) to 3 megahertz (MHz). Part of this band is
Medium_frequency
Small form factor atomic clock
ISSN 0003-6951. S2CID 119968560. Leo Hollberg and John Kitching, Miniature frequency standard based on all-optical excitation and a micro-machined containment vessel
Chip-scale_atomic_clock
Frequencies used by electrical components
desired frequency, so hundreds of standard crystal frequencies are made in large quantities and stocked by electronics distributors. Using frequency dividers
Crystal oscillator frequencies
Crystal_oscillator_frequencies
time standard is a time standard that does not require calibration against another time standard. Examples of primary time, (i.e., frequency standards) are
Primary_time_standard
Class of electrical signals
repeats once per second. PPS signals are output by radio beacons, frequency standards, other types of precision oscillators and some GPS receivers. Precision
Pulse-per-second_signal
European global navigation satellite system
include active hydrogen maser clocks and clocks based on the caesium frequency standard, which show a far better medium and long-term stability than rubidium
Galileo (satellite navigation system)
Galileo_(satellite_navigation_system)
Frequency characteristics of hearing and perceived volume
equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented
Equal-loudness_contour
Time of day voice service
The Time and Frequency Standards Section in the PMG Research Laboratories at 59 Little Collins Street, Melbourne maintained the frequency checks to ensure
Speaking_clock
Means of modulation in music production
Low-frequency oscillation (LFO) is an electronic frequency that is usually below 20 Hz and creates a rhythmic pulse or sweep. This is used to modulate
Low-frequency_oscillation
Distribution of letters in a typical Arabic text
The frequency of letters in text has often been studied for use in cryptanalysis, and frequency analysis in particular. No language has an exact letter
Arabic_letter_frequency
Range of frequencies that can be heard by humans or other animals
different frequencies to the subject, usually over calibrated headphones, at specified levels. The levels are weighted with frequency relative to a standard graph
Hearing_range
Vibrations with frequencies lower than 20 hertz
sound waves with a frequency below the lower limit of human audibility (generally 20 Hz, as defined by the ANSI/ASA S1.1-2013 standard). Hearing becomes
Infrasound
Video signal standard
horizontal frequency and vertical frequency (collectively, pixel clock rate or video signal bandwidth), and horizontal/vertical sync polarity. The standard was
Coordinated_Video_Timings
French longwave time signal radio station
ALS162 is a French longwave time signal and standard-frequency radio station and is used for the dissemination of the Metropolitan French national legal
ALS162_time_signal
Allocation and regulation of the electromagnetic spectrum into radio frequency bands
Frequency allocation is also a special term, used in national frequency administration. Other terms are: Several bodies set standards for frequency allocation
Frequency_allocation
FREQUENCY STANDARD
FREQUENCY STANDARD
Girl/Female
Latin American English
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Surname or Lastname
Swedish (also frequent in Finland)
Swedish (also frequent in Finland) : ornamental name from an unexplained first element + the suffix -lin or -in, common suffixes of surnames.French (Hélin) : from a pet form of Hélie (see Helie 1).French (Hélin) : from the Germanic personal name Heilin, a short form of any of various compound names with the first element heil (see Heilmann 2).English : variant of Hillian.
Girl/Female
Latin
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Girl/Female
Latin
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Surname or Lastname
English (frequent in eastern England)
English (frequent in eastern England) : ethnic name from Norman French aleman ‘German’ or alemayne ‘Germany’ (Late Latin Alemannus and Alemannia, from a Germanic tribal name that probably originally meant ‘all the men’). In some cases the surname may be from the region of Normandy known as Allemagne (south of Caen), probably named as a Germanic-speaking enclave in a Celtic area in Roman times. In North America, the form Allman has probably absorbed some cases of cognates from other languages, in particular Spanish Aleman and French Alleman.German (Allmann) : variant of Allemann (see Alleman) or in some cases probably an Americanized form of the same name.
Surname or Lastname
English
English : variant spelling of Byerly. In England this is the more frequent spelling.
Boy/Male
English American
A name beginning with D, also frequently used as an independent name.
Girl/Female
Arabic, Muslim
Prolific; Frequently Producing
Boy/Male
English American
Tile layer, or a. An English surname frequently used as a given name.
Girl/Female
Muslim
One who remembers God frequently
Surname or Lastname
English (Dorset)
English (Dorset) : unexplained. This name is frequent in Nova Scotia.
Surname or Lastname
English (most frequent in northern Ireland)
English (most frequent in northern Ireland) : from Middle English fe(i)th ‘belief (especially Christian belief)’, ‘faithfulness’, ‘loyalty’. This may have been a nickname for a trustworthy person, but was more probably bestowed on one who used ‘Faith!’ frequently as a mild oath or exclamation.
Boy/Male
English American Shakespearean
Derived from the English place name, meaning Bede's ford. Most frequently used as a surname.
Surname or Lastname
English
English : unexplained. Perhaps a variant of Newborn. This name occurs frequently in NC.
Surname or Lastname
English (Devon)
English (Devon) : unexplained. This is a frequent name in OH.
Surname or Lastname
English (also frequent in Wales)
English (also frequent in Wales) : patronymic from the personal name Watkin.
Surname or Lastname
English
English : variant of Postlethwait. This is the more frequent spelling in the British Isles.
Girl/Female
Latin English
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Girl/Female
Arabic, Muslim
One who Remembers God Frequently
Boy/Male
English American
Tile layer, or a. An English surname frequently used as a given name.
FREQUENCY STANDARD
FREQUENCY STANDARD
Boy/Male
Hindu, Indian
God Saint
Girl/Female
Norse
Second wife of Sigmund.
Girl/Female
Australian, Indian
Highest; At the Top; First
Boy/Male
Assamese, Hindu, Indian, Kannada, Telugu
Knowledge
Boy/Male
American, British, English, Scandinavian, Scottish
Dweller by the Church; Church
Boy/Male
Hindu, Indian, Sanskrit, Traditional
Mastered his Senses
Girl/Female
Australian, Irish
Honor; Valor
Boy/Male
Arabic, Muslim
Supporter of God
Boy/Male
Russian
Little.
Boy/Male
Gaelic
Little black one.
FREQUENCY STANDARD
FREQUENCY STANDARD
FREQUENCY STANDARD
FREQUENCY STANDARD
FREQUENCY STANDARD
n.
A crowd; a throng; a concourse.
n.
Frequency.
n.
Commonness; frequency.
v. t.
To frequent; to resort to frequently; to visit pertinaciously or intrusively; to intrude upon.
n.
A crowd; a throng.
n.
Often to be met with; happening at short intervals; often repeated or occurring; as, frequent visits.
n.
The condition of returning frequently; occurrence often repeated; common occurence; as, the frequency of crimes; the frequency of miracles.
adv.
At frequent or short intervals; many times; often; repeatedly; commonly.
a.
Frequent; numerous.
adv.
Frequently; often.
adv.
Frequently; often.
a.
Too frequent.
n.
Frequency.
n.
The state of rarely occuring; uncommonness; rareness; as, the infrquence of his visits.
n.
Frequency; abundance.
n.
Infrequency.
n.
The state of not being frequented; solitude; isolation; retirement; seclusion.
pl.
of Frequency
adv.
Frequently; often.
v. t.
To quote constantly or with great frequency.