Klarinet Archive - Posting 000213.txt from 2001/02

From: Gary Truesdail <gir@-----.net>
Subj: Re: [kl] Re: difference tones
Date: Wed, 7 Feb 2001 03:46:03 -0500

Now give them the next lesson in this sequence. Walter may be the only other
person besides you and myself to know how the difference tone keeps you from
humming the same pitch that you are playing on your instrument. (This is
important to know if your music requires you to growl, or as I have seen is
some music, play one note, hum a required pitch which will in turn produce a
difference tone - Voila - you are playing a trio with yourself, and if you
know the weird fingerings, you can get the clarinet to produce 2 - yes I said
two - different tones at the same time, then you have a quartet with
yourself.) Unfortunately it cannot produce the expected harmonic progressions
or voicings we all have grown to know and love.

GaryT

Grant Green wrote:

> >Labadorf@-----.com wrote:
> >
> >What is the difference tone when two persons are playing an octave?
> >
> >David
>
> You can calculate the difference tone by subtracting the frequency of
> the lower pitch from that of the upper pitch. The effect is not very
> noticeable when you play in octaves, because the upper pitch is
> exactly twice the lower pitch, which makes the difference tone a
> unison with the lower pitch.
>
> The difference tone if the pitches played are a fifth apart is an
> octave lower than the lower pitch (for example, if you play A4 and
> E4, the difference tone would be A3). If the pitches are a fourth
> apart, the difference tone is two octaves below the upper pitch
> (e.g., if you play A4 and D4, the difference is D2). You can tune
> the difference tone by adjusting the pitches you play - increasing
> the spread of the interval (raising the upper pitch or lowering the
> lower pitch) raises the difference tone pitch, and vice versa.
> Difference tones are sometimes used in pipe organs for the lower
> pedal notes: e.g., instead of having a rank of 64' (or 32') pipes,
> you may find a "resultant" voice that actually consists of shorter
> pipes played at a fixed interval to produce the desired difference
> tone.
>
> Grant
>
> ++++++++++++++++++++++++++++++++++++++++++++++++
> Grant Green gdgreen@-----.com
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>
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