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 ARCHIVED TOPIC: Banjo producing the low G below the D 4th string.

Please note this is an archived topic, so it is locked and unable to be replied to. You may, however, start a new topic and refer to this topic with a link:

Helix - Posted - 12/30/2023:  02:50:46

My Black Walnut #001 is producing the low G note which as we know is not on the 5-string banjo.

I hear that it is produced sympathetically by the 3rd and 4th strings together.

I enjoy this unusual presentation of sound especially in the "ring" of the droning banjo, it adds something.

Any ideas of how and why this is happening would be appreciated.
Is this an overtone? No undertones implied.

davidppp - Posted - 12/30/2023:  08:38:52

Google: missing fundamental

Brains work very hard to identify pitch. That's simple to do if there is a single, very strong sinusoidal Fourier (frequency) component. It gets tricky when the signal is complex. If the signal repeats at some audio frequency, that frequency might be the perceived pitch. When the signal is not even periodic, the brain looks for "autocorrelation," which is a measure of sort-of, rough repetition. The pitch that some people hear when they do head tap tuning is definitely in this category.

A proper spectrum analysis of the lowest normal notes on a banjo or guitar usually reveals that the strength of the component at the perceived pitch is so weak relative to the higher ones that it is effectively totally absent.

Helix - Posted - 12/30/2023:  14:51:56

I’ll just publish the phenomenon
Thanks for the explanation

I hear the G note.

Helix - Posted - 01/01/2024:  05:09:42

OK here's the difference.

I can see people know why it happens.

I want to know how it happens

steve davis - Posted - 01/01/2024:  15:21:27

When in tune my banjo produces a G overtone an octave below my 3rd string.
By in tune I mean 1,3,4 and 5 set at 0 and my B string tuned 5 to 6 cents flat.
I find the low G overtone to be in direct proportion to the physical vibration (rumble) felt in the resonator and neck when picked.
I believe the tapped head note is simply an audible note.
My G# head is the same as my 4th string/6th fret.

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