Compare two tones
Pick two frequencies. See the interval between them, then hear them one after the other or together. Start with the volume low.
Nearest note: A4, 32 cents below standard tuning
Nearest note: E5, 30 cents below standard tuning
Set tone B from tone A
Listen
“One in each ear” sends tone A to the left and tone B to the right. It needs headphones. “Both together” and “One in each ear” play until you press stop.
The interval
- Nearest pure interval
- Perfect Fifth
- Ratio 3:2. Exact.
- Nearest interval on a piano
- Perfect Fifth
- 7 semitones. This pair is 2 cents wider.
- Octaves apart
- Less than one
- 702.0 cents apart
The difference
The difference between the two tones as they are played.
These two tones are too far apart to beat: you hear two pitches.
Set a beat rate
Moves tone B so that the beat falls in the middle of a range. Gamma is set to 40 Hz: two tones further apart than that are heard as two pitches, not a beat. The ranges are the ones used to describe EEG recordings, borrowed here as labels. Band edges are conventions and vary by source.
Ranges adapted from Kane et al. 2017, Clin. Neurophysiol. Pract. 2:170–185 (IFCN glossary). This table starts delta at 0.5 Hz and beta just above 13 Hz, and adds a high gamma range that research papers use.