Chroma Fixation at the Ends of the Musical Frequency Scale

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Abstract
Persons with genuine absolute pitch were used as subjects, identifying notes of known frequency and purity. The subjects were successful up to about 4000 c.p.s., above that the chroma appeared too low, with increasing error, until, above 5000 c.p.s., all tones had the same chroma. A similar limit for tone chroma at low frequencies was indicated...