Sega Master System Architecture: Powerful as It Is by Rodrigo Copetti

Author:Rodrigo Copetti [Copetti, Rodrigo]
Language: eng
Format: epub
Tags: Nonfiction, Computers, Advanced Computing, Engineering, Computer Architecture, Application Software, Computer Graphics, Computer Science
ISBN: 9798201236779
Amazon: B0BB3DRKN1
Goodreads: 62908895
Published: 2020-10-11T14:30:00+00:00

7.1.2 Noise

Figure 7.2: Sonic The Hedgehog (1991). Noise channel. Interactive viewer available in the website edition.

Noise is a type of signal which is associated with interference. When outputted to a speaker, it sounds like static.

The SN76489 contains a Linear Feedback Shift Register or ‘LFSR’ which is fed with some input and cycled through to generate a pseudo-random signal. It does contain some parameters to switch between white noise and periodic noise, the latter steals the third pulse channel and feeds it through the LFSR to produce a bass-like sound (pulse at four octaves lower).

The oscillator used can also be altered to change the pitch, there are four options to choose from.

Games normally use the noise channel for percussion and/or sound effects.

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