downconversion
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Downconversion — HD The process of converting high resolution video to lower resolution video. Often done to high definition camera reels so that programs can be offlined on inexpensive standard definition editing systems before being conformed in High Definition … Audio and video glossary
Optical transfer function — The optical transfer function (OTF) of an imaging system (camera, video system, microscope etc) is the true measure of resolution (image sharpness) that the system is capable of. The common practice of defining resolution in terms of pixel count… … Wikipedia
Satellite television — List of digital television broadcast standards DVB standards (Europe) DVB S (satellite) DVB S2 DVB T (terrestrial) DVB T2 DVB C … Wikipedia
Very high frequency — (VHF) is the radio frequency range from 30 MHz to 300 MHz. Frequencies immediately below VHF are denoted High frequency (HF), and the next higher frequencies are known as Ultra high frequency (UHF). The frequency allocation is done by ITU. Common … Wikipedia
Glow stick — 1. Plastic casing covers the inner fluid. 2. A glass capsule covers the solution. 3. Phenyl Oxalate and fluorescent dye solution. 4. Hydrogen Peroxide solution. 5. After the glass capsule is broken and the solutions mix, the glowstick glows. A… … Wikipedia
L band — NATO L bandThe NATO L band is defined as the frequency band between 40 and 60 GHz (5–7.5 mm). IEEE L band The IEEE L band (20 cm radar long band) is a portion of the microwave band of the electromagnetic spectrum ranging roughly from 1 to 2 GHz.… … Wikipedia
Mopra Observatory — The 22 metre Mopra Radio Telescope, located near Coonabarabran, New South Wales, is part of the Australia Telescope National Facility, operated by CSIRO. The name hails from the location of the facility close to Mopra Rock a geological formation… … Wikipedia
Optical parametric oscillator — Infrared optical parametric oscillator An optical parametric oscillator (OPO) is a parametric oscillator which oscillates at optical frequencies. It converts an input laser wave (called pump ) into two output waves of lower frequency (ωs,ωi) by… … Wikipedia
Low IF receiver — In a low IF receiver, the RF signal is mixed down to a non zero low or moderate intermediate frequency, typically a few megahertz. Low IF receiver topologies have many of the desirable properties of zero IF architectures, but avoid the DC offset… … Wikipedia
Subharmonic mixer — Whereas in a fundamental frequency mixer the output frequency (f {out}) contains the sum and difference of the fundamental tones of the two input signals (f {out}=f {1} f {2} or f {out}=f {1}+f {2}), in a subharmonic mixer the output signal is… … Wikipedia
