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1 picture radio telegraphy
picture radio telegraphy Bildrundfunk mEnglish-German dictionary of Electrical Engineering and Electronics > picture radio telegraphy
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2 De Forest, Lee
SUBJECT AREA: Broadcasting, Electronics and information technology, Photography, film and optics, Recording, Telecommunications[br]b. 26 August 1873 Council Bluffs, Iowa, USAd. 30 June 1961 Hollywood, California, USA[br]American electrical engineer and inventor principally known for his invention of the Audion, or triode, vacuum tube; also a pioneer of sound in the cinema.[br]De Forest was born into the family of a Congregational minister that moved to Alabama in 1879 when the father became President of a college for African-Americans; this was a position that led to the family's social ostracism by the white community. By the time he was 13 years old, De Forest was already a keen mechanical inventor, and in 1893, rejecting his father's plan for him to become a clergyman, he entered the Sheffield Scientific School of Yale University. Following his first degree, he went on to study the propagation of electromagnetic waves, gaining a PhD in physics in 1899 for his thesis on the "Reflection of Hertzian Waves from the Ends of Parallel Wires", probably the first US thesis in the field of radio.He then joined the Western Electric Company in Chicago where he helped develop the infant technology of wireless, working his way up from a modest post in the production area to a position in the experimental laboratory. There, working alone after normal working hours, he developed a detector of electromagnetic waves based on an electrolytic device similar to that already invented by Fleming in England. Recognizing his talents, a number of financial backers enabled him to set up his own business in 1902 under the name of De Forest Wireless Telegraphy Company; he was soon demonstrating wireless telegraphy to interested parties and entering into competition with the American Marconi Company.Despite the failure of this company because of fraud by his partners, he continued his experiments; in 1907, by adding a third electrode, a wire mesh, between the anode and cathode of the thermionic diode invented by Fleming in 1904, he was able to produce the amplifying device now known as the triode valve and achieve a sensitivity of radio-signal reception much greater than possible with the passive carborundum and electrolytic detectors hitherto available. Patented under the name Audion, this new vacuum device was soon successfully used for experimental broadcasts of music and speech in New York and Paris. The invention of the Audion has been described as the beginning of the electronic era. Although much development work was required before its full potential was realized, the Audion opened the way to progress in all areas of sound transmission, recording and reproduction. The patent was challenged by Fleming and it was not until 1943 that De Forest's claim was finally recognized.Overcoming the near failure of his new company, the De Forest Radio Telephone Company, as well as unsuccessful charges of fraudulent promotion of the Audion, he continued to exploit the potential of his invention. By 1912 he had used transformer-coupling of several Audion stages to achieve high gain at radio frequencies, making long-distance communication a practical proposition, and had applied positive feedback from the Audion output anode to its input grid to realize a stable transmitter oscillator and modulator. These successes led to prolonged patent litigation with Edwin Armstrong and others, and he eventually sold the manufacturing rights, in retrospect often for a pittance.During the early 1920s De Forest began a fruitful association with T.W.Case, who for around ten years had been working to perfect a moving-picture sound system. De Forest claimed to have had an interest in sound films as early as 1900, and Case now began to supply him with photoelectric cells and primitive sound cameras. He eventually devised a variable-density sound-on-film system utilizing a glow-discharge modulator, the Photion. By 1926 De Forest's Phonofilm had been successfully demonstrated in over fifty theatres and this system became the basis of Movietone. Though his ideas were on the right lines, the technology was insufficiently developed and it was left to others to produce a system acceptable to the film industry. However, De Forest had played a key role in transforming the nature of the film industry; within a space of five years the production of silent films had all but ceased.In the following decade De Forest applied the Audion to the development of medical diathermy. Finally, after spending most of his working life as an independent inventor and entrepreneur, he worked for a time during the Second World War at the Bell Telephone Laboratories on military applications of electronics.[br]Principal Honours and DistinctionsInstitute of Electronic and Radio Engineers Medal of Honour 1922. President, Institute of Electronic and Radio Engineers 1930. Institute of Electrical and Electronics Engineers Edison Medal 1946.Bibliography1904, "Electrolytic detectors", Electrician 54:94 (describes the electrolytic detector). 1907, US patent no. 841,387 (the Audion).1950, Father of Radio, Chicago: WIlcox \& Follett (autobiography).De Forest gave his own account of the development of his sound-on-film system in a series of articles: 1923. "The Phonofilm", Transactions of the Society of Motion Picture Engineers 16 (May): 61–75; 1924. "Phonofilm progress", Transactions of the Society of Motion Picture Engineers 20:17–19; 1927, "Recent developments in the Phonofilm", Transactions of the Society of Motion Picture Engineers 27:64–76; 1941, "Pioneering in talking pictures", Journal of the Society of Motion Picture Engineers 36 (January): 41–9.Further ReadingG.Carneal, 1930, A Conqueror of Space (biography).I.Levine, 1964, Electronics Pioneer, Lee De Forest (biography).E.I.Sponable, 1947, "Historical development of sound films", Journal of the Society of Motion Picture Engineers 48 (April): 275–303 (an authoritative account of De Forest's sound-film work, by Case's assistant).W.R.McLaurin, 1949, Invention and Innovation in the Radio Industry.C.F.Booth, 1955, "Fleming and De Forest. An appreciation", in Thermionic Valves 1904– 1954, IEE.V.J.Phillips, 1980, Early Radio Detectors, London: Peter Peregrinus.KF / JW -
3 frequency
1) частота
2) многократность
3) частотно
4) частотность
5) частотный
6) темп
– allocate frequency
– alternate frequency
– angular frequency
– antiresonance frequency
– antiresonant frequency
– assigned frequency
– audio frequency
– base frequency
– basic frequency
– beat frequency
– break frequency
– buoyancy frequency
– calling frequency
– carrier frequency
– cell frequency
– collision frequency
– commercial frequency
– component frequency
– conversion frequency
– critical frequency
– crossover frequency
– cutoff frequency
– cyclotron frequency
– difference frequency
– dot frequency
– driving frequency
– espected frequency
– field frequency
– fixed frequency
– flicker frequency
– formant frequency
– fractional frequency
– frame frequency
– free-running frequency
– frequency alignment
– frequency allocation
– frequency analysis
– frequency band
– frequency calibration
– frequency changer
– frequency channel
– frequency characteristic
– frequency code
– frequency compression
– frequency control
– frequency converter
– frequency correction
– frequency curve
– frequency departure
– frequency deviation
– frequency discrimination
– frequency distortion
– frequency distribution
– frequency diversity
– frequency divider
– frequency division
– frequency domain
– frequency doubler
– frequency drift
– frequency feedback
– frequency function
– frequency in pitch
– frequency in roll
– frequency interleaving
– frequency interpretation
– frequency isolation
– frequency jitter
– frequency jumping
– frequency limit
– frequency lock-in
– frequency mark
– frequency marker
– frequency match
– frequency meter
– frequency modulated
– frequency modulation
– frequency modulator
– frequency monitoring
– frequency multiplex
– frequency multiplication
– frequency multiplier
– frequency nominal
– frequency of event
– frequency polygon
– frequency pulling
– frequency range
– frequency ratio
– frequency response
– frequency selective
– frequency setting
– frequency shift
– frequency spacing
– frequency spectrum
– frequency splitting
– frequency spread
– frequency stability
– frequency stabilization
– frequency standard
– frequency synthesis
– frequency synthesizer
– frequency telegraphy
– frequency tolerance
– frequency transformation
– frequency transformer
– frequency translation
– frequency tripler
– frequency tuning
– frequency wobbling
– fundamental frequency
– genotype frequency
– harmonic frequency
– heterodyne frequency
– high frequency
– hold on to frequency
– hypersonic frequency
– idler frequency
– image frequency
– increase the frequency
– infrasonic frequency
– injection frequency
– instantaneous frequency
– intermediate frequency
– ion plasma frequency
– Larmor frequency
– laser frequency
– line frequency
– lock on frequency
– lowest-useful frequency
– magnetoplasma frequency
– marking frequency
– maser frequency
– master frequency
– modulating frequency
– modulation frequency
– multiple frequency
– multiplier of frequency
– natural frequency
– network frequency
– non-dimensional frequency
– operation frequency
– oscillation frequency
– oscillator frequency
– pedestal frequency
– penetration frequency
– picture frequency
– pilot frequency
– pitch frequency
– plasma frequency
– precessional frequency
– pump frequency
– quench frequency
– radio frequency
– rated frequency
– relative frequency
– repetition frequency
– resonance frequency
– resonant frequency
– ripple frequency
– scan frequency
– scanning frequency
– scattering frequency
– screen frequency
– set up fixed frequency
– set up frequency
– side frequency
– signal frequency
– slip frequency
– spacing frequency
– spatial frequency
– standard frequency
– Stokes frequency
– straight-line frequency
– subcarrier frequency
– subsonic frequency
– sum frequency
– superhigh frequency
– switching frequency
– synchronous frequency
– threshold frequency
– tracking frequency
– translate frequency
– tune to frequency
– ultra-high frequency
– ultrasonic frequency
– vibration frequency
– voice frequency
– wave frequency
– working frequency
– zero frequency
additive frequency mixing — преобразование частоты аддитивное
amplitude frequency distortion — амплитудно-частотное искажение
automatic frequency control — частотная АПЧ, автоматическая настройка частоты
automatic frequency unloading — разгрузка автоматическая частотная
carrier frequency system — система передачи с частотным разделением каналов
commutator-type frequency converter — коллекторный преобразователь частот
compensation frequency telegraphy — телеграфирование частотное компенсационное
compound frequency distribution — <math.> плотность распределения осредненная
decibel-log frequency characteristic — логарифмическая амплитудно-частотная характеристика
flatness of a frequency curve — сглаженность кривой плотности
frequency compensated amplifier — усилитель корректированный
frequency deviation meter — <tech.> стабилометр частоты
frequency domain spectroscopy — спектроскопия стационарная, спектроскопия частотная
frequency force factor — <electr.> коэффициент силовой частоты
kurtosis of a frequency curve — эксцесс плотности распределения
kurtosis of frequency curve — эксцесс плотности распределения
molecular rotation frequency — вращательная частота молекулы
moment of a frequency distributi — момент распределения вероятности
multiple-position frequency telegraphy — телеграфия частотная многопозиционная
operation frequency range — рабочий диапазон частот прибора СВЧ
parasite frequency modulation — паразитная частотная модуляция
roll-off of frequency response — завал частотной характеристики
signal increases in frequency — сигнал увеличивается по частоте
static frequency converter — статический преобразователь частоты
subcarrier frequency modulation — частотная модуляция с поднесущей
thyratron frequency changer — тиратронный преобразователь частоты
time-sharing two frequency laser — лазер с попеременной генерацией двух частот
transient frequency jitter — < radio> дергание частоты
valve-type frequency converter — вентильный преобразователь частоты
variable frequency oscillator — генератор плавного диапазона
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4 automatic
1) автоматический
2) автоматный
– automatic air regulator
– automatic alarm
– automatic arc welding
– automatic assembly
– automatic balancer
– automatic billing
– automatic brake
– automatic bridge
– automatic calculator
– automatic check
– automatic circuit-breaker
– automatic clutch
– automatic control
– automatic coupler
– automatic cutout
– automatic diagnosis
– automatic ejection
– automatic equipment
– automatic factory
– automatic feed
– automatic feeder
– automatic filler-and-capper
– automatic flanger
– automatic gauging
– automatic grab
– automatic grinder
– automatic guider
– automatic guiding
– automatic hitch
– automatic holding
– automatic interlocking
– automatic labeller
– automatic loom
– automatic lubricator
– automatic machine
– automatic monitoring
– automatic operation
– automatic overlay
– automatic paster
– automatic performance
– automatic pilot
– automatic pipette
– automatic plant
– automatic production
– automatic programming
– automatic recloser
– automatic recorder
– automatic register
– automatic regulation
– automatic release
– automatic releaser
– automatic reset
– automatic ringing
– automatic scales
– automatic set point
– automatic setting
– automatic splicer
– automatic steel
– automatic steering
– automatic stop
– automatic switch
– automatic switching
– automatic telegraphy
– automatic ticketing
– automatic timer
– automatic tracking
– automatic tuning
automatic adjustment of excitation — регулирование возбуждения автоматическое
automatic answering machine — < radio> автономность самолета, автоответчик
automatic block system — < railways> автоблокировка
automatic circuit breaker — автомат защиты сети, выключатель автоматический
automatic cold upsetter — <metal.> автомат холодновысадочный
automatic control equipment — аппаратура автоматического управления
automatic curve follower — устойчиво для автоматического копирования кривых
automatic data processing — автоматизация информационных работ, <comput.> обработка данных автоматическая
automatic deicing system — <aeron.> автомат противообледенительной системы
automatic direction finder — автоматический радиокомпас, <naut.> пеленгатор автоматический
automatic drinking bowl — <agric.> автопоилка
automatic field damper — <electr.> автомат гашения поля
automatic frequency control — частотная АПЧ, автоматическая настройка частоты
automatic frequency unloading — разгрузка автоматическая частотная
automatic fuel distributor — <engin.> распределитель топлива автоматический
automatic fuel-control unit — <engin.> агрегат командно-топливный
automatic gain adjustment — стабилизация усиления автоматическая
automatic gain control — <tech.> регулировка усиления автоматическая
automatic humidity regulator — <comput.> контроллер влажности автоматический
automatic level gage — автур, уровнемер автоматический
automatic moisture regulator — <comput.> регулятор влажности автоматический
automatic parallel-action machin — автомат параллельного действия
automatic phase regulation — регулировка фазы автоматическая
automatic picture stabilization — автоматическая стабилизация изображения
automatic pitch-control mechanism — <aeron.> автомат перекоса
automatic position plotter — <naut.> автопрокладчик
automatic pressure regulator — <comput.> автомат давления
automatic production line — <industr.> линия автоматическая
automatic range finder — <tech.> автодальномер
automatic remote control — <comput.> телеавтоматика
automatic signal transmitter — <commun.> автомат подачи сигналов
automatic stereoplate caster — стереотипный отливной автомат
automatic telephone exchange — автоматическая телефонная станция
automatic temperature regulator — <comput.> регулятор температуры автоматический
automatic tracking device — <comput.> устройство сопровождения автоматическое
automatic train driver — < railways> автомашинист
automatic voltage control — регулирование напряжения автоматическое
automatic voltage regulator — регулятор напряжения автоматический
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