frequency modulationn.

Brit.

/ˌfriːkw(ə)nsɪ ˌmɒdjᵿˈleɪʃn/,

/ˈfriːkw(ə)nsɪ mɒdjᵿˌleɪʃn/,

/ˌfriːkw(ə)nsɪ ˌmɒdʒᵿˈleɪʃn/,

/ˈfriːkw(ə)nsɪ mɒdʒᵿˌleɪʃn/, U.S.

/ˌfrikwənsi ˌmɑdʒəˈleɪʃən/,

/ˈfrikwənsi ˌmɑdʒəˌleɪʃən/

(a) Modulation of a wave by variation of its frequency. (b) The system of transmission of radio waves, etc., using such modulation. Abbrev. F.M. Cf. amplitude modulation at amplitude n. 6c.

ΘΚΠ

society > communication > telecommunication > [noun] > signal > modulation

choke control1909

modulation1919

frequency modulation1922

pulse modulation1929

phase modulation1930

undermodulation1940

pulse time modulation1944

pulse position modulation1945

PCM1947

pulse amplitude modulation1947

pulse code modulation1947

pulse frequency modulation1950

pulse width modulation1953

pulse duration modulation1956

1922 J. R. Carson in Proc. IRE 10 59 It has been proposed..to employ an apparently radically different system of modulation which may be termed frequency modulation as distinguished from amplitude modulation, in the belief that the former system makes possible the transmission of signals by a narrower range of transmitted frequencies.

1943 Electronic Engin. 15 440/1 The ideal detector for frequency modulation is one which not only faithfully reproduces the true form of the f.m. components, but also is unresponsive to amplitude fluctuations of the carrier signal.

1955 Times 29 July 5/4 The present system of amplitude modulation in the v.h.f. maritime services should be changed to one of frequency modulation.

1958 N.Z. Listener 10 Oct. 21/1 The possibility of introducing FM (frequency modulation), a method of broadcasting that gives high fidelity reception.

1962 Which? Feb. 36/2 On the VHF band the FM (frequency modulation) system is used.

Derivatives

frequency-modulated adj.

ΘΚΠ

society > communication > telecommunication > [adjective] > modulated

frequency-modulated1936

phase-modulated1936

pulse-modulated1943

pulse-time-modulated1945

undermodulated1974

1936 R. S. Glasgow Princ. Radio Engin. xi. 314 In order for a phase- or a frequency-modulated signal to become audible, it must be converted into an amplitude-modulated signal.

1950 Gloss. Terms Radar (B.S.I.) 6 Frequency-modulated radar, a form of radar in which the radiated wave is frequency-modulated and the returning echo beats with the wave being radiated, thus enabling the range to be measured.

frequency-modulate v. [as a back-formation]

ΘΚΠ

society > communication > telecommunication > [verb (transitive)] > modulate

modulate1908

phase-modulate1941

pulse1957

frequency-modulate1962

undermodulate1962

1962 F. I. Ordway et al. Basic Astronautics vii. 322 The radio frequency carrier wave is modulated by a group of subcarriers... The subcarriers are frequency-modulated by the characteristics of the intelligence.

This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2021).

单词	frequency modulation
释义	frequency modulationn. Brit. /ˌfriːkw(ə)nsɪ ˌmɒdjᵿˈleɪʃn/, /ˈfriːkw(ə)nsɪ mɒdjᵿˌleɪʃn/, /ˌfriːkw(ə)nsɪ ˌmɒdʒᵿˈleɪʃn/, /ˈfriːkw(ə)nsɪ mɒdʒᵿˌleɪʃn/, U.S. /ˌfrikwənsi ˌmɑdʒəˈleɪʃən/, /ˈfrikwənsi ˌmɑdʒəˌleɪʃən/ (a) Modulation of a wave by variation of its frequency. (b) The system of transmission of radio waves, etc., using such modulation. Abbrev. F.M. Cf. amplitude modulation at amplitude n. 6c. ΘΚΠ society > communication > telecommunication > [noun] > signal > modulation choke control1909 modulation1919 frequency modulation1922 pulse modulation1929 phase modulation1930 undermodulation1940 pulse time modulation1944 pulse position modulation1945 PCM1947 pulse amplitude modulation1947 pulse code modulation1947 pulse frequency modulation1950 pulse width modulation1953 pulse duration modulation1956 1922 J. R. Carson in Proc. IRE 10 59 It has been proposed..to employ an apparently radically different system of modulation which may be termed frequency modulation as distinguished from amplitude modulation, in the belief that the former system makes possible the transmission of signals by a narrower range of transmitted frequencies. 1943 Electronic Engin. 15 440/1 The ideal detector for frequency modulation is one which not only faithfully reproduces the true form of the f.m. components, but also is unresponsive to amplitude fluctuations of the carrier signal. 1955 Times 29 July 5/4 The present system of amplitude modulation in the v.h.f. maritime services should be changed to one of frequency modulation. 1958 N.Z. Listener 10 Oct. 21/1 The possibility of introducing FM (frequency modulation), a method of broadcasting that gives high fidelity reception. 1962 Which? Feb. 36/2 On the VHF band the FM (frequency modulation) system is used. Derivatives frequency-modulated adj. ΘΚΠ society > communication > telecommunication > [adjective] > modulated frequency-modulated1936 phase-modulated1936 pulse-modulated1943 pulse-time-modulated1945 undermodulated1974 1936 R. S. Glasgow Princ. Radio Engin. xi. 314 In order for a phase- or a frequency-modulated signal to become audible, it must be converted into an amplitude-modulated signal. 1950 Gloss. Terms Radar (B.S.I.) 6 Frequency-modulated radar, a form of radar in which the radiated wave is frequency-modulated and the returning echo beats with the wave being radiated, thus enabling the range to be measured. frequency-modulate v. [as a back-formation] ΘΚΠ society > communication > telecommunication > [verb (transitive)] > modulate modulate1908 phase-modulate1941 pulse1957 frequency-modulate1962 undermodulate1962 1962 F. I. Ordway et al. Basic Astronautics vii. 322 The radio frequency carrier wave is modulated by a group of subcarriers... The subcarriers are frequency-modulated by the characteristics of the intelligence. This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2021). < n.1922
随便看	metamictization metamictness metamodel metamorphia metamorphic metamorphic aureole metamorphical metamorphically metamorphine metamorphism metamorphisms metamorphist metamorphize metamorphized metamorphizing metamorphogenic metamorphology metamorphopsia metamorphopsiae metamorphopsias metamorphosable metamorphoscope metamorphose metamorphosed metamorphoser