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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 ...
Envelope generators, which allow users to control the different stages of a sound, are common features of synthesizers, samplers, and other electronic musical instruments. The most common envelope generator is controlled with four parameters: attack , decay , sustain and release ( ADSR ).
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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 ...
Note: Information in the chart has been superseded by the information in File:United States Frequency Allocations Chart 2016 - The Radio Spectrum.pdf, which was downloaded from the US Department of Commerce web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.
The TX81Z is built around a single FM chip, the Yamaha YM2414B aka OPZ, while 6-op machines like the DX7 have separate envelope/frequency and algorithm/wave chips and created LFOs in software; this large workload in the OPZ is probably why it has fewer operators and notes. A 63B03 CPU allocates voices and generates auxiliary LFOs, in parallel ...
The frequencies of the harmonic series, being integer multiples of the fundamental frequency, are naturally related to each other by whole-numbered ratios and small whole-numbered ratios are likely the basis of the consonance of musical intervals (see just intonation). This objective structure is augmented by psychoacoustic phenomena.
Sweeping the wavetable in either direction can be controlled in a number of ways, for example, by use of an LFO, envelope, pressure or velocity. Many wavetables used in PPG and Ensoniq synthesizers can simulate the methods used by analog synthesizers, such as pulse-width modulation by utilising a number of square waves of different duty cycles ...