frequency deviation वाक्य
उदाहरण वाक्य
मोबाइल
- The code frequency deviation is 1 / 1, 540 times the carrier frequency deviation for L1 because the code frequency is 1 / 1, 540 of the carrier frequency ( see ?Frequencies used by GPS ).
- Value of frequency deviation belongs to the hold-in range if the loop re-achieves locked state after small perturbations of the filter's state, the phases and frequencies of VCO and the input signals.
- So + /-. 5 Hz should cover extreme frequency deviations, and a somewhat tighter band ( + /-. 1 Hz ? ) should cover normal day to day deviations, outside of system instability or overloads.
- The pull-in range is used to name such frequency deviations that make the acquisition process possible ( see, e . g . explanations in [, p . 40 ], [, p . 61 ] ).
- The short-term stability is measured by four main parameters : Allan variance ( the most common one specified in oscillator data sheets ), phase noise, spectral density of phase deviations, and spectral density of fractional frequency deviations.
- In analog frequency modulation, such as FM radio broadcasting of an audio signal representing voice or music, the instantaneous frequency deviation, the difference between the frequency of the carrier and its center frequency, is proportional to the modulating signal.
- Where " A c " represents the amplitude of the CPFSK signal, " f c " is the base carrier frequency, and " D f " is a parameter that controls the frequency deviation of the modulated signal.
- OFDM requires very accurate frequency synchronization between the receiver and the transmitter; with frequency deviation the sub-carriers will no longer be orthogonal, causing " inter-carrier interference " ( ICI ) ( i . e ., cross-talk between the sub-carriers ).
- The center frequency must be no more than 25 kHz from this nominal value and the frequency deviation must be no more than 25 kHz peak when being tone used to modulate the subcarrier is nominally 1200 Hz, but may vary by as much as 800 Hz ( 400 to 2000 Hz ).
- The FM broadcasting range ( 87.5 108 MHz, NOTE : In some countries the 87.5 88.0 MHz part of the band is not used ) uses a channel spacing of 200 kHz, with a maximum frequency deviation of 75 kHz, leaving a 25 kHz buffer above the highest and below the lowest frequency to reduce interaction with other channels.
- If the power is provided by stand-alone generators, then the frequency deviation could be much wider, perhaps several Hz . Outlet power or even the power on the utility feeders also contains harmonic multiples of the mains frequency, the amount varying greatly depending on transformer balancing and the loads customers have connected . talk ) 17 : 32, 24 February 2009 ( UTC)
- A varactor, a diode with capacitance depending on applied voltage, is often used in voltage-controlled crystal oscillators, VCXO . The crystal cuts are usually AT or rarely SC, and operate in fundamental mode; the amount of available frequency deviation is inversely proportional to the square of the overtone number, so a third overtone has only one-ninth of the pullability of the fundamental mode.
- :Probably very little; most systems with sensitive electronics use a power supply and convert the AC to DC . Those converters often use a filling ( or holding ) capacitor, and since 50 and 60 Hz are fairly close anyway, the capacitor will effectively convert to DC . A few AC items such as motors might possibly be sensitive to the frequency deviation, so you should check tolerances for particular devices.
- While wideband FM uses more bandwidth, it can improve the signal-to-noise ratio significantly; for example, doubling the value of \ Delta { } f \,, while keeping f _ m constant, results in an eight-fold improvement in the signal-to-noise ratio . ( Compare this with Chirp spread spectrum, which uses extremely wide frequency deviations to achieve processing gains comparable to traditional, better-known spread-spectrum modes ).
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