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Unformatted text preview: Below we have replaced t, continuous time, with sampled time, nT, where T=1/fs the sampling frequency used to convert our CT sin wave to DT. X[n]=sin(2πf nT ) T=1/fs fs=sampling frequency (8khz) T sin T A B C D E F G A Some Discussion of (Attack-Decay-Sustain-Release) ADSR t(sec.) Amplitude t(sec.) t(sec.) The ADSR shape is a property of the instrument which produced the note. Above are examples from a guitar and piano. For this assignment we are only asking you to use an ADSR that is piecewise linear. The above ADSR envelopes are provided for additional explanation of real world ADSR’s. This visualization is provided to help explain how the ADSR is applied to a pure tone. Plot a, is a pure tone, the sin wave in plot c has the same frequency, thus the same tone, however the loudness (amplitude) has been “shaped” by the ADSR....
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- Spring '09
- sin wave, ADSR, CT sin wave