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frequency drift การใช้

ประโยคมือถือ
  • Why does the frequency drift suggest a natural source or a glitch?
  • The addition of a beacon local oscillator wave meter permitted the determination of spacecraft-transmitter frequency drift.
  • It is also unaffected by linear frequency drift.
  • One example is in a device will not alter the piezoelectric effect, thereby causing frequency drift.
  • This modulation produces a signal which is much more tolerant of receiver mis-tunings and frequency drift than MFSK modulation.
  • In electrical engineering, and particularly in telecommunications, "'frequency drift "'is an unintended and generally arbitrary offset of an oscillator from its nominal frequency.
  • The heat generated in the gain medium leads to frequency drift of the cavity, therefore the frequency can be actively stabilized by locking it to unpowered cavity.
  • Frequency drift is traditionally measured in Hz / s . "'Frequency stability "'can be regarded as the absence ( or a very low level ) of frequency drift.
  • Frequency drift is traditionally measured in Hz / s . "'Frequency stability "'can be regarded as the absence ( or a very low level ) of frequency drift.
  • The " Allan variance " is intended to estimate stability due to noise processes and not that of systematic errors or imperfections such as frequency drift or temperature effects.
  • Significant contributions have also been made in the field of gravitational wave detectors . \ Douglass has also worked on chaos and frequency drifts of spectral lines of extended sources.
  • This variant of the Sagnac interferometer is hence insensitive to rotation or low frequency drift of its optical components, while maintaining a high sensitivity to transient events of astronomical interest.
  • On a radio transmitter, frequency drift can cause a radio station to drift into an adjacent channel, causing illegal compensated, voltage-controlled crystal oscillator ( TCVCXO ) is normally used for frequency modulation.
  • This can be envisaged by considering a laser producing a sine wave whose frequency drifts over time; the coherence length can then be considered to be the distance over which it maintains a single frequency.
  • However the resonant frequency of a tuned circuit is not very stable; variations in temperature and aging of components caused frequency drift . Automatic frequency control ( AFC ) solves some of the drift problem, but manual retuning was often necessary.
  • Video recorders ( as opposed to camcorders ) don't suffer from frequency drift with a ( compliant ) input signal, as they constantly resync using special information embedded in the PAL or NTSC signal ( the horizontal and vertical retrace signals ).
  • "So UPS is necessary for products to prevent computer systems breaking down when there are some problems with electricity supply, such as black outs, brown outs, surges, spikes, noise and frequency drift . UPS will provide power backup to protect data loss on computer systems, " he said.
  • Where x ( t ) is the time error; x _ 0 is the time error at t = 0; y _ 0 is the fractional frequency error at t = 0; D is the linear fractional frequency drift rate; \ phi ( t ) is the random phase deviation component and \ nu _ { nom } is the nominal frequency.