PURPOSE: To demonstrate how a sinusoidal tone can be masked when its frequency is in the vicinity of narrow-band noise.
DESCRIPTION: Narrow-band noise is produced with its frequency centered near A=440Hz. Playing a scale from the bottom to the top of the synthesizer keyboard, one easily hears notes at frequencies below and above that of the narrow-band noise. In the region of the noise, the scale tones are masked, and cannot be heard.
REFERENCES: (PIRA unavailable.)
EQUIPMENT: ARP synthesizer set to accompanying patch sheet.
SETUP TIME: 5 min.
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