News for hackers. Stuff that matters.

A comment on Illusions of Sound Perception. Parent comment

Re:Illusions of Sound Perception by jacquesm on Monday September 16, 2019 @10:06AM (#20984114)
Mixing two frequencies leads to 'sum' and 'difference' frequencies.

https://en.wikipedia.org/wiki/Frequency_mixer

It doesn't quite work that way with audio but the effects are close enough.

[ Parent | on HN ]
Re:Illusions of Sound Perception by DoctorOetker on Monday September 16, 2019 @10:10AM (#20984149)
yes that is a second type of ambiguity, and it does occur in audio as well:

an lower frequenncy sinusoidally amplitude modulated higher frequency sinusoid can be indistinguishable from 2 constant amplitude sinusoids at the sum and difference of the frequencies.

see an article by Plomp and Leveldt for the determination of the bandwidth of the auditory frequency bins (or filter bank)

[ Parent | on HN ]
Re:Illusions of Sound Perception by munificent on Monday September 16, 2019 @12:11PM (#20985544)
I think the psychoacoustic term for this is "combination tones":

https://en.wikipedia.org/wiki/Combination_tone

[ Parent | on HN ]