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2. Envelope (waves) - Wikipedia

   en.wikipedia.org/wiki/Envelope_(waves)

   In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. [1] The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope. The envelope function may be a ...

3. Envelope detector - Wikipedia

   en.wikipedia.org/wiki/Envelope_detector

   Envelope detectors are often a component of other circuits, such as a compressor or an auto-wah or envelope-followed filter. In these circuits, the envelope follower is part of what is known as the " side chain ", a circuit which describes some characteristic of the input, in this case its volume.

4. Envelope (music) - Wikipedia

   en.wikipedia.org/wiki/Envelope_(music)

   In sound and music, an envelope describes how a sound changes over time. For example, a piano key, when struck and held, creates a near-immediate initial sound which gradually decreases in volume to zero. An envelope may relate to elements such as amplitude (volume), frequency (with the use of filters) or pitch.

5. Programmable sound generator - Wikipedia

   en.wikipedia.org/wiki/Programmable_sound_generator

   The waveforms' frequency and volume (and noise's tone and volume) are typically shaped using an envelope and/or mixed before being sent to the audio output stage. [ 1 ] Many PSGs feature three tone channels and one noise channel including the AY-3-8910, SN76489 and MOS Technology 6581.

6. File:United States Frequency Allocations Chart 2011 - The ...

   en.wikipedia.org/wiki/File:United_States...

   Note: Information in the chart has been superseded by the information in File:United States Frequency Allocations Chart 2016 - The Radio Spectrum.pdf, which was downloaded from the US Department of Commerce web site and archived at archive.org.

7. Carrier-envelope phase - Wikipedia

   en.wikipedia.org/wiki/Carrier-envelope_phase

   CEP in the frequency domain: The frequency spectrum of the above pulse train is a frequency comb which shows an offset if it is continued until a frequency of zero. This offset is the carrier-envelope frequency f C E O {\displaystyle f_{\mathrm {CEO} }} , and f r e p = 1 / T r e p {\displaystyle f_{\mathrm {rep} }=1/T_{\mathrm {rep} }} is the ...