  We present a framework for experimentally linking speech production and
hearing. Using this approach, we describe experimental results, that lead to
the concept that sounds made by different individuals and perceived to be the
same can be transformed into each other by a "speech scale". The speech scale
is empirically determined using only speech data. We show the similarity of the
speech scale to the MEL scale of Stevens and Volkmann, which was derived only
from hearing experiments. We thus experimentally link speech production and
hearing.
