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Friis formula or Friis's formula (sometimes Friis' formula), named after Danish-American electrical engineer Harald T. Friis, is either of two formulas used in telecommunications engineering to calculate the signal-to-noise ratio of a multistage amplifier. One relates to noise factor while the other relates to noise temperature.
Friis' original idea behind his transmission formula was to dispense with the usage of directivity or gain when describing antenna performance. In their place is the descriptor of antenna capture area as one of two important parts of the transmission formula that characterizes the behavior of a free-space radio circuit. [2]
Love Will Come: The Music of Vince Guaraldi, Volume 2 is the 16th album by pianist George Winston and 12th solo piano album, released on February 2, 2010. The album is a follow-up to the well-received 1996 tribute album highlighting much of Guaraldi's Peanuts works, Linus and Lucy: The Music of Vince Guaraldi .
The noise power from a simple load is equal to kTB, where k is the Boltzmann constant, T is the absolute temperature of the load (for example a resistor), and B is the measurement bandwidth. This makes the noise figure a useful figure of merit for terrestrial systems, where the antenna effective temperature is usually near the standard 290 K ...
Linus was a tragédie en musique in five acts with a libretto by Charles-Antoine Leclerc de La Bruère. For reasons which remain unclear it was never staged and the music is almost completely lost. Only two manuscript copies of the libretto and two manuscript copies of the violin part survive. [5]
"Linus and Lucy" is a popular instrumental jazz standard written by American jazz pianist Vince Guaraldi. It serves as the main theme tune for the many Peanuts animated specials and is named for the two fictional siblings, Linus and Lucy Van Pelt .
The noise factor (a linear term) is more often expressed as the noise figure (in decibels) using the conversion: = The noise figure can also be seen as the decrease in signal-to-noise ratio (SNR) caused by passing a signal through a system if the original signal had a noise temperature of 290 K. This is a common way of expressing the noise ...
Harald Trap Friis (22 February 1893 – 15 June 1976), who published as H. T. Friis, was a Danish-American radio engineer whose work at Bell Laboratories included pioneering contributions to radio propagation, radio astronomy, and radar. [1]
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