Klarinet Archive - Posting 000509.txt from 1998/09

From: "Tim Roberts" <timr@-----.com>
Subj: Re: [kl] Re: Pitch standards
Date: Tue, 15 Sep 1998 16:24:36 -0400

On 12 Sep 1998 19:31:55 -0700, Matt Palasik <mattp169@-----.com> wrote:
>According to the physics each half step shoud be a+a/12 apart from the
>next note where a is the frequency of the relative pitch. so if a=440
>then a# should be 476 2/3.

Close, but not quite right. To get to the next half-step above f, you don't
just add f/12. Instead, you multiply f by the twelfth root of 2. The
difference is significant; after 12 steps, 13/12 gets you to 2.6X the original,
instead of 2.0X.

>... SO when the room is at 72 a@-----.

Actually, A# @-----.

--
- Tim Roberts, timr@-----.com
Providenza & Boekelheide, Inc.

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