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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 ...
Archiving, data management, analysis of sound recordings for bat surveys. Supports bat corder raw and wave files. PAMGuard [19] GPL v3: Windows (parts will run under Linux) Open Source software for the Detection Classification and Localisation (DCL) of marine mammal sounds. Can process hydrophone data in real time or can process files offline.
This image or file is a work of a United States Department of Commerce employee, taken or made as part of that person's official duties. As a work of the U.S. federal government , the image is in the public domain .
The delay setting determines the length of silence between hitting a note and the attack. Some software synthesizers, such as Image-Line's 3xOSC (included with their DAW FL Studio) have DAHDSR (delay, attack, hold, decay, sustain, release) envelopes. A common feature on many synthesizers is an AD envelope (attack and decay only).
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.
Note: Information in the chart has been superseded by the information in File:United States Frequency Allocations Chart 2016 - The Radio Spectrum.pdf, which was downloaded from the US Department of Commerce web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.
Envelope-based intelligibility metrics have also been derived using modulation filterbanks [67] and using envelope time-frequency modulation patterns. [264] Envelope cross-correlation is also used for estimating speech and music quality. [265] [266] Envelope and TFS measurements can also be combined to form intelligibility and quality metrics.
Oramics (1957) controls sounds by graphics on films. Variophone (1930) by Evgeny Sholpo—on earliest version, hand drawn waves on film or disc were used to synthesize sound, and later versions were promised to experiment on musical intonations and temporal characteristics of live music performance, however not finished.