noise power वाक्य
उदाहरण वाक्य
मोबाइल
- In a noisy channel, the BER is often expressed as a function of the normalized carrier-to-noise ratio measure denoted Eb / N0, ( energy per bit to noise power spectral density ratio ), or Es / N0 ( energy per modulation symbol to noise spectral density ).
- In heterodyne systems, output noise power includes spurious contributions from image-frequency transformation, but the portion attributable to thermal noise in the input termination at standard noise temperature includes only that which appears in the output via the principal frequency transformation of the system and excludes that which appears via the image frequency transformation.
- If the resistor is at a physical temperature " T R ", then the Johnson-Nyquist noise power coupled to the amplifier input is " P J = k B T R B ", where " k B " is Boltzmann s constant and " B " is the bandwidth.
- Noise is a random process, characterized by resistive element is proportional to the square of the voltage across it, noise voltage ( density ) can be described by taking the square root of the noise power density, resulting in volts per root hertz ( \ scriptstyle \ mathrm { V } / \ sqrt { \ mathrm { Hz } } ).
- Sensitivity in a receiver is normally defined as the minimum input signal S _ i required to produce a specified signal-to-noise S / N ratio at the output port of the receiver and is defined as the mean noise power at the input port of the receiver times the minimum required signal-to-noise ratio at the output of the receiver:
- Noise power is measured in watts or decibels ( dB ) relative to a standard power, usually indicated by adding a suffix after dB . Examples of electrical noise-level measurement units are dBu, dBm0, dBrn, dBrnC, and dBrn ( " f " 1 " " f " 2 ), dBrn ( 144-line ).
- It therefore adds 1 / 10 of the noise power caused by the source, and the noise figure is 0.4 dB . For a low-impedance source of 250 ?, on the other hand, the noise voltage contribution of the tube is 10 times larger than the signal source, so that the noise power is one hundred times larger than that caused by the source.
- It therefore adds 1 / 10 of the noise power caused by the source, and the noise figure is 0.4 dB . For a low-impedance source of 250 ?, on the other hand, the noise voltage contribution of the tube is 10 times larger than the signal source, so that the noise power is one hundred times larger than that caused by the source.
- Where u is the spatial frequency variable in cycles per millimeter, q is the density of incident x-ray quanta in quanta per square millimeter, G is the system gain relating q to the output signal for a linear and offset-corrected detector, T ( u ) is the system modulation transfer function, and W ( u ) is the image Wiener noise power spectrum corresponding to q.
- The noise power at the output of the amplifier ( i . e . the noise power coupled to an impedance-matched load that is connected to the amplifier output ) is " P out = Gk B ( T R + T amp ) B ", where " G " is the amplifier power gain and " T amp " is the amplifier noise temperature.
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