Speaking clearly. Improving voice and articulation: Фонетический практикум. Фомиченко Л.Г. - 74 стр.

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effect of physical size on the voice is best appreciated by the changes
in your natural pitch that occur as you pass from childhood into
maturity. The female voice reaches full maturity at about age 35, the
male voice at around age 25.
       Lifestyle exerts considerable effect on both the quality of the
voice and the pitch at which you normally speak. If you often shout
or yell, if you use tobacco, or must take medicine that dries the
mouth and throat, your vocal cords are being mistreated. At the very
least, your voice may become husky and your pitch range may be
affected.
       Keeping these cautionary words in mind, let’s consider the
ways you can enlarge your pitch range. With practice, almost every
adult speaker can develop a range of about two octave…...
       …...your voice will sound most pleasant to listeners if you use,
primarily, pitches within the lower half of your range. Extremely
high and low pitches are often annoying or grating to hear. Speaking
at unnaturally low or high pitches is very tiring for the vocal organs.
       Since your goal is to develop a pleasant and interesting speaking
voice, we’ve developed the following Practice Session for this purpose.
This exercise will help you to locate the pitches at which your voice
achieves the most resonance. .… ..
       DETERMINING OPTIMUM RESONANCE. Place the palms
of your hands on your cheeks and rest a finger lightly on either side
of your nose. Read a series of sentences you have chosen from books
or magazines for this purpose. Vary your voice pitch while doing so.
You will feel your nose and cheeks vibrate when you reach your
optimum (most pleasing, effective) resonance. Then, to eliminate the
distraction of tissue- and bone-conducted sound, tape record your
delivery (at that optimum pitch) so that you can experience your
voice as others hear it.
       Next, listen to the tape recording you’ve made of your speaking
voice. ...…You may need to change speech behaviors. Solicit and con-
sider the opinions of friends and relatives, but remember, you must
please yourself first!
       Inflection. This term refers to the rising and the falling of the
pitch of the speaking voice. Inflection adds variety to your speech and
gives words and sentences their meanings. Use inflection with discre-
tion. Vary the pitch as you speak. Avoid both monotone and sing-song
deliveries. Rapidly alternating swings between high and low pitches
usually make a speaker sound affected or unnatural. It is very impor-