By Charles Dodge, Thomas A. Jerse
This article displays the present nation of desktop know-how and tune composition. The authors provide transparent, functional overviews of application languages, real-time synthesizers, electronic filtering, man made intelligence, and lots more and plenty extra.
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This article displays the present nation of laptop expertise and tune composition. The authors provide transparent, functional overviews of application languages, real-time synthesizers, electronic filtering, man made intelligence, and lots more and plenty extra.
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Extra resources for Computer Music: Synthesis, Composition, and Performance, 2nd Ed.
For example, when an amplitude doubles, the increase corresponds to 6 dB. The decibel is sometimes used to give absolute measurement of acoustic intensity. Implicit in this kind of measurement is the existence of a reference "sound-pressure level" to which the signal is being compared. In acoustics, the reference sound-pressure level is generally taken as the threshold of audibility. A sound at that level has a value of o dB SPL, where SPL denotes sound-pressure level. Conversational speech has an intensity of approximately 60 dB SPL, while shouted speech is closer to 80 dB SPL.
4 Generation of a sine wave by tracing the time pattern of the height of a spoke tip on a rotating wheel. characterized as exhibiting a phase rate of 3600/second, a 2-Hz waveform runs at 720°/second, and so on. In computer music, a particular waveform may be repeated at several different frequencies during the course of a composition in order to obtain dif ferent pitches. Hence, it is often useful in computer music to define a single cycle of a waveform only in terms of its phase. ) The phase of a particular point on a waveform is measured as an angle from some reference position, most commonly taken as the point where the waveform has a value of 0 and is increasing.
Because the recording medium stores numbers rather than an analog signal, it offers superior noise perfor mance and protects the sound more effectively against degradation during long-term storage. In addition, regardless of the number of generations removed, a copy of a digi tal recording maintains complete fidelity to the original. 3a can also be used for signal processing. Here, the computer modifies the digital signals before passing them to the D/A converter for reconversion. The modifications can be as simple as mixing the signal applied to the input with another digital signal previously stored in external memory.