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21 diagram
диаграмма; схема; график; чертёж || строить диаграмму; составлять схему; строить график- Applegate diagram
- application flow diagram
- Argand diagram
- band diagram
- bifurcation diagram
- binary decision diagram
- binary-phase diagram
- block diagram
- Bode diagram
- Bohr-Grotrian diagram
- cardioid diagram
- Cayley diagram
- chain diagram
- chromaticity diagram
- CIE chromaticity diagram
- CIE uniform-chromaticity-scale diagram
- CIE USC diagram
- circle diagram
- circuit diagram
- class diagram
- cluster diagram
- cognitive diagram
- color-phase diagram
- conceptual diagram
- connection diagram
- constellation diagram
- constitution diagram
- control diagram
- cording diagram
- cosecant-squared diagram
- coverage diagram
- dataflow diagram
- directional diagram
- directivity diagram
- elementary diagram
- energy diagram
- energy-level diagram
- entity-relationship diagram
- equilibrium diagram
- eye diagram
- flow diagram
- functional diagram
- Gabor diagram
- geodesic chromaticity diagram
- geometric power diagram
- Hartree diagram
- highway diagram
- impedance circle diagram
- indicator diagram
- interconnection diagram
- isocandela diagram
- isolux diagram
- key diagram
- layer diagram of neural network
- load impedance diagram
- logic diagram
- logical diagram
- module diagram
- network diagram
- neuron diagram
- nodal diagram
- Nyquist diagram
- object diagram
- onion diagram
- phase diagram
- phasor diagram
- pictorial wiring diagram
- point diagram
- polar diagram
- potential diagram
- process diagram
- RGB chromaticity diagram
- Rieke diagram
- SADT diagram
- scatter diagram
- scattering diagram
- schematic circuit diagram
- skeleton diagram
- Smith diagram
- stability diagram
- standard chromaticity diagram
- state diagram
- state-transition diagram
- stick diagram
- structured analysis and design technique diagram
- tactical circuit diagram
- time diagram
- timing diagram
- tree diagram
- trunking diagram
- UCS diagram
- uniform chromaticity scale diagram
- vector diagram
- Venn diagram
- wiring diagramThe New English-Russian Dictionary of Radio-electronics > diagram
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22 method
1) метод; способ (см. тж. technique 1)2) ООП метод (функция - элемент определения класса (class) в языке Smalltalk, в C++ - см. member function)•- alphageometric method
- Amble's method
- ancestor method
- assembly method
- basic access method
- bibliography method
- bit-level method
- branch and bounds method
- buffering method
- building-block method
- chaining method
- checksum method
- coded pattern method
- conditional delay method
- constraint satisfaction method
- critical path method
- cut-and-try method
- cutset method
- dark-spot method
- data access method
- deductive method
- derivative approximation method
- diagonal method
- diagram method
- dichotomy method
- digital sorting method
- direct access method
- exhaustive method
- false position method
- finished method
- finitary method
- finite difference method
- flip-chip method
- flooding method
- flowgraph method
- frequency analysis method
- gradient method
- graphic access method
- heuristic method
- hierarchical access method
- hit-and-miss method
- Horner's method
- hunt-and-stick method
- index register method
- indexed-sequential access method
- inline-code method
- inverse power method
- inverse transformation method
- issue method
- iteration method
- least-squares method
- left-edge method
- lightweight formal method
- linkage method
- longest route method
- machine method
- maximum-likelihood method
- method of quickest descent
- method of selected point
- method of successive approximations
- Monte-Carlo method
- net method
- Newton's method
- nonrestoring method
- N-pass method
- numerical method
- operational method
- opposition method
- overlay method
- part-continuous method
- partitioned access method
- pencil-and-paper method
- perturbation method
- piezoelectric sensing method
- ping-pong method
- power method
- predictor-corrector method
- programming method
- progressive-part method
- proprietary method
- pure virtual method
- queued access method
- queued indexed sequential access method
- radial exploration method
- random-walk method
- recursive descendant method
- regular falsi method
- resetting method
- resident access method
- review article method
- row-by-row method
- rubber band method
- Runge-Kutta method
- saddle point method
- sampling method
- scale factor method
- scan-set method
- scheduling method
- scissors and paste method
- secant method
- sectioning method
- semigroup method
- sequential access method
- shortcut method
- shortcut multiplication method
- sieve method
- simplex method
- single-path instruction method
- sit-by-me instuction method
- state-space method
- steepest descent method
- step-by-step method
- stroke method
- subject profile method
- symbolic method
- symbolical method
- syntactic method
- synthetic method
- target method
- telecommunication access method
- temporal difference method
- time-domain method
- touch method with ten fingers
- trial-and-error method
- truth table method
- variable separation method
- variable-metric method
- variational method
- variation method
- V-brush method
- vernier pulse-timing method
- virtual method
- wire-wrap method
- zero-deflection methodEnglish-Russian dictionary of computer science and programming > method
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23 double
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24 vocal
1. n фон. вокальное произведение, песня2. n фон. исполнение вокального произведения3. a голосовой; речевой4. a устный, словесный5. a говорящий, обладающий даром речи6. a красноречивый, выразительный7. a шумный; голосистый; крикливый8. a гласный; громкий9. a поэт. звучный, звучащий; полный звуков10. a муз. вокальный, для голоса11. a фон. звонкийСинонимический ряд:1. articulate (adj.) articulate; eloquent; fluent; oral; smooth-spoken; sonant; spoken; viva voce2. outspoken (adj.) assertive; blunt; candid; direct; frank; free; free-spoken; noisy; outspoken; publicity-hungry; round; vehement; vociferous; whistle-blowing3. vocalic (adj.) vocalic; vowel; vowely4. voiced (adj.) articulated; expressed; sung; uttered; verbalized; vocalized; voicedАнтонимический ряд:subtle; unspoken -
25 piece
A n1 ( indeterminate amount) (of fabric, wood, paper, metal) morceau m, bout m ; (of string, ribbon) bout m ; (of cake, pie, pâté) morceau m, tranche f ; (of meat, cheese, chocolate) morceau m ;2 ( unit) a piece of furniture un meuble ; a piece of pottery une poterie ; a piece of sculpture une sculpture ; a piece of luggage une valise ; a piece of advice un conseil ; a piece of evidence une preuve ; a piece of information un renseignement ; a piece of legislation une loi ; a piece of news une nouvelle ; a piece of work gen un travail ; (referring to book, article etc) une œuvre ; a piece of luck un coup de chance ; a piece of history une tranche d'histoire ; to be paid by the piece être payé à la pièce ; they cost £20 a piece ils coûtent 20 livres pièce ;3 ( component part) (of jigsaw, machine, model) pièce f ; piece by piece pièce par pièce ; in pieces en pièces (détachées) ; to come in pieces [kit furniture] être livré en kit ; to take sth to pieces démonter qch ;4 ( broken fragment) (of glass, cup) morceau m, fragment m ; in pieces en morceaux, en miettes ; to fall to pieces [machine, object] tomber en morceaux ; fig [case, argument] s'effondrer ; it came to pieces in my hands ça s'est cassé dans mes mains ; to go to pieces fig [person] ( from shock) s'effondrer ; ( emotionally) craquer ○ ; ( in interview) paniquer complètement ;5 ( artistic work) ( of music) morceau m ; ( sculpture) sculpture f ; ( painting) peinture f ; ( article) article m (on sur) ; ( play) pièce f ; he read them a piece out of the book il leur a lu un passage du livre ;6 ( instance) a piece of un exemple de [propaganda, materialism, flattery] ; a wonderful piece of running/acting/engineering une très belle course/interprétation/réalisation technique ;11 ○ ( woman) beau brin m de fille ○.B - piece (dans composés) a 60-piece cutlery set un service de couverts de 60 pièces ; a 5-piece band Mus un groupe de 5 musiciens.to be (all) of a piece [town, house] être d'un style homogène ; to be (all) of a piece with sth [action, statement, ideas] s'accorder avec qch ; to be still in one piece [object] être intact ; [person] être sain et sauf ; to give sb a piece of one's mind dire ses quatre vérités or son fait à qn ; to pick sth to pieces descendre qch en flammes ; to pick up the pieces recoller les morceaux ; to say one's piece dire ce qu'on a à dire.▶ piece [sth] together, piece together [sth] rassembler [fragments, shreds] ; reconstituer [vase, garment, letter] ; assembler [puzzle] ; fig reconstituer [facts, evidence, event, account] ; they tried to piece together what had happened ils ont essayé de reconstituer ce qui s'était passé. -
26 break
break [breɪk]casser ⇒ 1 (a), 1 (c) briser ⇒ 1 (a), 1 (i), 1 (j) fracturer ⇒ 1 (b) enfoncer ⇒ 1 (e) violer, enfreindre ⇒ 1 (f) rompre ⇒ 1 (h) couper ⇒ 1 (h) ruiner ⇒ 1 (k) amortir ⇒ 1 (l) se casser ⇒ 2 (a) se briser ⇒ 2 (a) se fracturer ⇒ 2 (b) cassure, brisure ⇒ 3 (a) fissure, fente ⇒ 3 (b) ouverture ⇒ 3 (c) interruption ⇒ 3 (d) pause ⇒ 3 (e) évasion ⇒ 3 (f) chance ⇒ 3 (g) changement ⇒ 3 (h)(a) (split into pieces → glass, furniture) casser, briser; (→ branch, lace, string, egg, toy) casser;∎ break the stick in two cassez le bâton en deux;∎ to break sth into pieces mettre qch en morceaux;∎ to get broken se casser;∎ to break a safe forcer un coffre-fort;∎ figurative to break bread with sb partager le repas de qn;∎ figurative to break sb's heart briser le cœur à qn;∎ Ross broke her heart Ross lui a brisé le cœur;∎ it breaks my heart to see her unhappy ça me brise le cœur de la voir malheureuse;∎ figurative to break the ice rompre ou briser la glace∎ to break one's leg se casser ou se fracturer la jambe;∎ to break one's neck se casser ou se rompre le cou;∎ the fall broke his back la chute lui a brisé les reins;∎ familiar figurative they broke their backs trying to get the job done ils se sont éreintés à finir le travail;∎ familiar we've broken the back of the job nous avons fait le plus gros du travail;∎ familiar I'll break his neck if I catch him doing it again! je lui tords le cou si je le reprends à faire ça!;(c) (render inoperable → appliance, machine) casser;∎ you've broken the TV tu as cassé la télé(d) (cut surface of → ground) entamer; (→ skin) écorcher; Law (seals → illegally) briser; (legally) lever;∎ the seal on the coffee jar was broken le pot de café avait été ouvert;∎ the skin isn't broken la peau n'est pas écorchée;∎ to break new or fresh ground innover, faire œuvre de pionnier;∎ scientists are breaking new or fresh ground in cancer research les savants font une percée dans la recherche contre le cancer(e) (force a way through) enfoncer;∎ the river broke its banks la rivière est sortie de son lit;∎ to break the sound barrier franchir le mur du son;(f) Law (violate → law, rule) violer, enfreindre; (→ speed limit) dépasser; (→ agreement, treaty) violer; (→ contract) rompre; (→ promise) manquer à; Religion (→ commandment) désobéir à; (→ Sabbath) ne pas respecter;∎ she broke her appointment with them elle a annulé son rendez-vous avec eux;∎ he broke his word to her il a manqué à la parole qu'il lui avait donnée;∎ Law to break parole = commettre un délit qui entraîne la révocation de la mise en liberté conditionnelle;∎ Military to break bounds violer la consigne∎ to break jail s'évader (de prison);∎ to break camp lever le camp;(h) (interrupt → fast, monotony, spell) rompre; Electricity (→ circuit, current) couper; Typography (→ word, page) couper;∎ we broke our journey at Brussels nous avons fait une étape à Bruxelles;∎ a cry broke the silence un cri a déchiré ou percé le silence;∎ the plain was broken only by an occasional small settlement la plaine n'était interrompue que par de rares petits hameaux;∎ Military to break step rompre le pas∎ the new offer broke the deadlock la nouvelle proposition a permis de sortir de l'impasse;∎ he's tried to stop smoking but he can't break the habit il a essayé d'arrêter de fumer mais il n'arrive pas à se débarrasser ou se défaire de l'habitude;∎ to break sb of a habit corriger ou guérir qn d'une habitude;∎ to break oneself of a habit se corriger ou se défaire d'une habitude(j) (wear down, destroy → enemy) détruire; (→ person, will, courage, resistance) briser; (→ witness) réfuter; (→ health) abîmer; (→ alibi) écarter;∎ torture did not break him or his spirit il a résisté à la torture;∎ this scandal could break them ce scandale pourrait signer leur perte;∎ the experience will either make or break him l'expérience lui sera ou salutaire ou fatale(k) (bankrupt) ruiner;∎ her new business will either make or break her sa nouvelle affaire la rendra riche ou la ruinera;∎ to break the bank (exhaust funds) faire sauter la banque;(l) (soften → fall) amortir, adoucir;∎ we planted a row of trees to break the wind nous avons planté une rangée d'arbres pour couper le vent(m) (reveal, tell) annoncer, révéler;∎ break it to her gently annonce-le lui avec ménagement(n) (beat, improve on) battre;∎ to break a record battre un record;∎ the golfer broke 90 le golfeur a dépassé le score de 90(o) (solve → code) déchiffrer∎ to break sb's service (in tennis) prendre le service de qn;∎ Hingis was broken in the fifth game Hingis a perdu son service dans le cinquième jeu∎ can you break a £10 note? pouvez-vous faire de la monnaie sur un billet de 10 livres?∎ to break wind lâcher un vent(a) (split into pieces → glass, furniture) se casser, se briser; (→ branch, stick) se casser, se rompre; (→ lace, string, egg, toy) se casser;∎ to break apart se casser ou se briser (en morceaux);∎ the plate broke in two l'assiette s'est cassée en deux;∎ to break into pieces se casser en morceaux;∎ figurative her heart broke elle a eu le cœur brisé∎ is the bone broken? y a-t-il une fracture?;∎ humorous any bones broken? rien de cassé?∎ the dishwasher broke last week le lave-vaisselle est tombé en panne la semaine dernière(d) (disperse → clouds) se disperser, se dissiper; Military (→ troops) rompre les rangs; (→ ranks) se rompre∎ to break free se libérer;∎ the ship broke loose from its moorings le bateau a rompu ses amarres(f) (fail → health, person, spirit) se détériorer;∎ the witness broke under questioning le témoin a craqué au cours de l'interrogatoire;∎ she or her spirit did not break elle ne s'est pas laissée abattre;∎ their courage finally broke leur courage a fini par les abandonner(g) (take a break) faire une pause;∎ let's break for coffee arrêtons-nous pour prendre un café(h) (arise suddenly → day) se lever, poindre; (→ dawn) poindre; Press & Television (→ news) être annoncé; (→ scandal, war) éclater(i) (move suddenly) se précipiter, foncer∎ she was so upset that her voice kept breaking elle était tellement bouleversée que sa voix se brisait∎ the sea was breaking against the rocks les vagues se brisaient sur les rochers∎ her waters have broken elle a perdu les eaux∎ to break right/badly bien/mal se passer∎ break! break!, stop!3 noun(a) (in china, glass) cassure f, brisure f; (in wood) cassure f, rupture f; Medicine (in bone, limb) fracture f; figurative (with friend, group) rupture f; (in marriage) séparation f;∎ the break with her husband was a painful experience ça a été très pénible pour elle quand elle s'est séparée de son mari;∎ her break with the party in 1968 sa rupture avec le parti en 1968;∎ to make a clean break with the past rompre avec le passé(c) (gap → in hedge, wall) trouée f, ouverture f; Geology (→ in rock) faille f; (→ in line) interruption f, rupture f; Typography (→ in word) césure f; (→ in pagination) fin f de page;∎ a break in the clouds une éclaircie(d) (interruption → in conversation) interruption f, pause f; (→ in payment) interruption f, suspension f; (→ in trip) arrêt m; (→ in production) suspension f, rupture f; (→ in series) interruption f; Literature & Music pause f; (in jazz) break m;∎ guitar break (in rock) (courte) improvisation f de guitare;∎ Electricity a break in the circuit une coupure de courant;∎ Radio a break for commercials, a (commercial) break un intermède de publicité; Television un écran publicitaire, une page de publicité;∎ Television a break in transmission une interruption des programmes (due à un incident technique)∎ let's take a break on fait une pause?;∎ we worked all morning without a break nous avons travaillé toute la matinée sans nous arrêter;∎ he drove for three hours without a break il a conduit trois heures de suite;∎ you need a break (short rest) tu as besoin de faire une pause; (holiday) tu as besoin de vacances;∎ an hour's break for lunch une heure de pause pour le déjeuner;∎ lunch break pause f de midi;∎ do you get a lunch break? tu as une pause à midi?;∎ a weekend in the country makes a pleasant break un week-end à la campagne fait du bien;∎ familiar give me a break! (don't talk nonsense) dis pas n'importe quoi!; (stop nagging) fiche-moi la paix!∎ Law jail break évasion f (de prison);∎ she made a break for the woods elle s'est élancée vers le bois;∎ to make a break for it prendre la fuite∎ you get all the breaks! tu en as du pot!;∎ to have a lucky break avoir de la veine;∎ to have a bad break manquer de veine;∎ this could be your big break ça pourrait être la chance de ta vie;∎ she's never had an even break in her life rien n'a jamais été facile dans sa vie;∎ give him a break donne-lui une chance; (he won't do it again) donne-lui une seconde chance∎ a break in the weather un changement de temps;∎ the decision signalled a break with tradition la décision marquait une rupture avec la tradition(i) (carriage) break m∎ at break of day au point du jour, à l'aube∎ to have a service break or a break (of serve) (in tennis) avoir une rupture de service (de l'adversaire);∎ to have two break points (in tennis) avoir deux balles de break;∎ he made a 70 break (in snooker, pool etc) il a fait une série de 70►► Computing break character caractère m d'interruption;Computing break key touche f d'interruption∎ I broke away from the crowd je me suis éloigné de la foule;∎ he broke away from her grasp il s'est dégagé de son étreinte∎ a group of MPs broke away from the party un groupe de députés a quitté le parti;∎ as a band they have broken away from traditional jazz leur groupe a (complètement) rompu avec le jazz traditionneldétacher;∎ they broke all the fittings away from the walls ils ont décroché toutes les appliques des murs(in tennis) = gagner le service de son adversaire après avoir perdu son propre service(a) (vehicle, machine) tomber en panne;∎ the car has broken down la voiture est en panne(b) (fail → health) se détériorer; (→ authority) disparaître; (→ argument, system, resistance) s'effondrer; (→ negotiations, relations, plan) échouer;∎ radio communications broke down le contact radio a été coupé;∎ their marriage is breaking down leur mariage se désagrège(c) (lose one's composure) s'effondrer;∎ to break down in tears fondre en larmes∎ the report breaks down into three parts le rapport comprend ou est composé de trois parties∎ to break down into sth se décomposer en qch∎ we must break down old prejudices il faut mettre fin aux vieux préjugés(b) (analyse → idea, statistics) analyser; (→ reasons) décomposer; (→ account, figures, expenses) décomposer, ventiler; (→ bill, estimate) détailler; (→ substance) décomposer;∎ the problem can be broken down into three parts le problème peut se décomposer en trois parties➲ break in∎ a month should be enough to break you in to the job un mois devrait suffire pour vous faire ou vous habituer au métier(b) (clothing) porter (pour user);∎ I want to break these shoes in je veux que ces chaussures se fassent(c) (knock down → door) enfoncer∎ to break in on sb/sth interrompre qn/qch∎ they broke into the safe ils ont fracturé ou forcé le coffre-fort;∎ they've been broken into three times ils se sont fait cambrioler trois fois∎ the audience broke into applause le public s'est mis à applaudir;∎ to break into a run/sprint se mettre à courir/à sprinter;∎ the horse broke into a gallop le cheval a pris le galop(c) (conversation) interrompre(d) (start to spend → savings) entamer;∎ I don't want to break into a £20 note je ne veux pas entamer un billet de 20 livres∎ the firm has broken into the Japanese market l'entreprise a percé sur le marché japonais(a) (separate) se détacher, se casser;∎ a branch has broken off une branche s'est détachée (de l'arbre)∎ he broke off in mid-sentence il s'est arrêté au milieu d'une phrase;∎ to break off for ten minutes prendre dix minutes de pause;∎ to break off for lunch s'arrêter pour déjeuner(c) (end relationship) rompre;∎ she's broken off with him elle a rompu avec lui(a) (separate) détacher, casser;∎ to break sth off sth casser ou détacher qch de qch(b) (end → agreement, relationship) rompre;∎ they've broken off their engagement ils ont rompu leurs fiançailles;∎ to break it off (with sb) rompre (avec qn);∎ Italy had broken off diplomatic relations with Libya l'Italie avait rompu ses relations diplomatiques avec la Libye∎ to break a desk open ouvrir un bureau en forçant la serrure∎ to break out in spots or in a rash avoir une éruption de boutons;∎ to break out in a sweat se mettre à transpirer;∎ she broke out in a cold sweat elle s'est mise à avoir des sueurs froides∎ to break out from or of prison s'évader (de prison);∎ we have to break out of this vicious circle il faut que nous sortions de ce cercle vicieux(bottle, champagne) ouvrir(sun) percer;∎ I broke through the crowd je me suis frayé un chemin à travers la foule;∎ the troops broke through enemy lines les troupes ont enfoncé les lignes ennemies;∎ she eventually broke through his reserve elle a fini par le faire sortir de sa réservepercer; figurative & Military faire une percée;∎ figurative his hidden feelings tend to break through in his writing ses sentiments cachés tendent à transparaître ou percer dans ses écrits➲ break up(a) (divide up → rocks) briser, morceler; Law (→ property) morceler; (→ soil) ameublir; (→ bread, cake) partager;∎ she broke the loaf up into four pieces elle a rompu ou partagé la miche en quatre;∎ illustrations break up the text le texte est aéré par des illustrations(c) (end → fight, party) mettre fin à, arrêter; Commerce & Law (→ conglomerate, trust) scinder, diviser; Commerce (→ company) scinder; Politics (→ coalition) briser, rompre; Administration (→ organization) dissoudre; (→ empire) démembrer; (→ family) séparer;∎ his drinking broke up their marriage le fait qu'il buvait a brisé ou détruit leur mariage(d) (disperse → crowd) disperser;∎ the news really broke her up la nouvelle l'a complètement bouleversée∎ her stories really break me up! ses histoires me font bien marrer!(a) (split into pieces → road, system) se désagréger; (→ ice) craquer, se fissurer; (→ ship) se disloquer;∎ the ship broke up on the rocks le navire s'est disloqué sur les rochers(b) (come to an end → meeting, party) se terminer, prendre fin; (→ partnership) cesser, prendre fin; (→ talks, negotiations) cesser;∎ when the meeting broke up à l'issue ou à la fin de la réunion;∎ their marriage broke up leur mariage n'a pas marché(c) (boyfriend, girlfriend) rompre;∎ she broke up with her boyfriend elle a rompu avec son petit ami;∎ they've broken up ils se sont séparés∎ we break up for Christmas on the 22nd les vacances de Noël commencent le 22;∎ when do we break up? quand est-ce qu'on est en vacances?(f) (lose one's composure) s'effondrer(a) (end association with → person, organization) rompre avec;∎ the defeat caused many people to break with the party la défaite a poussé beaucoup de gens à rompre avec le parti(b) (depart from → belief, values) rompre avec;∎ she broke with tradition by getting married away from her village elle a rompu avec la tradition en ne se mariant pas dans son village -
27 Armstrong, Edwin Howard
[br]b. 18 December 1890 New York City, New York, USAd. 31 January 1954 New York City, New York, USA[br]American engineer who invented the regenerative and superheterodyne amplifiers and frequency modulation, all major contributions to radio communication and broadcasting.[br]Interested from childhood in anything mechanical, as a teenager Armstrong constructed a variety of wireless equipment in the attic of his parents' home, including spark-gap transmitters and receivers with iron-filing "coherer" detectors capable of producing weak Morse-code signals. In 1912, while still a student of engineering at Columbia University, he applied positive, i.e. regenerative, feedback to a Lee De Forest triode amplifier to just below the point of oscillation and obtained a gain of some 1,000 times, giving a receiver sensitivity very much greater than hitherto possible. Furthermore, by allowing the circuit to go into full oscillation he found he could generate stable continuous-waves, making possible the first reliable CW radio transmitter. Sadly, his claim to priority with this invention, for which he filed US patents in 1913, the year he graduated from Columbia, led to many years of litigation with De Forest, to whom the US Supreme Court finally, but unjustly, awarded the patent in 1934. The engineering world clearly did not agree with this decision, for the Institution of Radio Engineers did not revoke its previous award of a gold medal and he subsequently received the highest US scientific award, the Franklin Medal, for this discovery.During the First World War, after some time as an instructor at Columbia University, he joined the US Signal Corps laboratories in Paris, where in 1918 he invented the superheterodyne, a major contribution to radio-receiver design and for which he filed a patent in 1920. The principle of this circuit, which underlies virtually all modern radio, TV and radar reception, is that by using a local oscillator to convert, or "heterodyne", a wanted signal to a lower, fixed, "intermediate" frequency it is possible to obtain high amplification and selectivity without the need to "track" the tuning of numerous variable circuits.Returning to Columbia after the war and eventually becoming Professor of Electrical Engineering, he made a fortune from the sale of his patent rights and used part of his wealth to fund his own research into further problems in radio communication, particularly that of receiver noise. In 1933 he filed four patents covering the use of wide-band frequency modulation (FM) to achieve low-noise, high-fidelity sound broadcasting, but unable to interest RCA he eventually built a complete broadcast transmitter at his own expense in 1939 to prove the advantages of his system. Unfortunately, there followed another long battle to protect and exploit his patents, and exhausted and virtually ruined he took his own life in 1954, just as the use of FM became an established technique.[br]Principal Honours and DistinctionsInstitution of Radio Engineers Medal of Honour 1917. Franklin Medal 1937. IERE Edison Medal 1942. American Medal for Merit 1947.Bibliography1922, "Some recent developments in regenerative circuits", Proceedings of the Institute of Radio Engineers 10:244.1924, "The superheterodyne. Its origin, developments and some recent improvements", Proceedings of the Institute of Radio Engineers 12:549.1936, "A method of reducing disturbances in radio signalling by a system of frequency modulation", Proceedings of the Institute of Radio Engineers 24:689.Further ReadingL.Lessing, 1956, Man of High-Fidelity: Edwin Howard Armstrong, pbk 1969 (the only definitive biography).W.R.Maclaurin and R.J.Harman, 1949, Invention \& Innovation in the Radio Industry.J.R.Whitehead, 1950, Super-regenerative Receivers.A.N.Goldsmith, 1948, Frequency Modulation (for the background to the development of frequency modulation, in the form of a large collection of papers and an extensive bibliog raphy).KFBiographical history of technology > Armstrong, Edwin Howard
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