| 释义 |
demodulation Electr.|diːmɒdjuːˈleɪʃən|
[f. de- II. 3 + modulation.]
The process of obtaining from a modulated wave or voltage a signal which has the same form as the signal originally used to modulate it; the recovery of modulation; cf. detection (sense 3). Hence deˈmodulator, a device or circuit used to effect demodulation.
1921Electrician 15 Apr. 452/1 By the term ‘demodulation’ is meant the process of reproducing the original low frequency modulating wave from the carrier wave upon which it has been impressed. Ibid., We may determine..the components of voice frequency in the output circuit of the demodulator by considering the interaction of the various..frequencies. 1929T. E. Shea Transmission Networks & Wave Filters i. i. 20 In radio systems, a ‘carrier frequency’ and ‘two sidebands’ are produced. For demodulation and recognition of signals the carrier frequency and one sideband may be suppressed. 1942Electronic Engin. XIV. 728 If..it is desired to reduce the frequency modulation percentage of the broadcast signal..this can conveniently be done by passing a portion of the signal..through a demodulator. 1962Simpson & Richards Junction Transistors xviii. 460 The removal of the modulation from a carrier or i.f. signal is called demodulation or detection. 1963G. Troup Masers & Lasers (ed. 2) ix. 162 Demodulation of microwave-modulated light has been achieved using travelling wave tubes. |