Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info

Spring Fundraising Drive In Progress. Please visit our home page to see this and other announcements:     Thank you. --Jody

MMD > Archives > October 1999 > 1999.10.13 > 09Prev  Next

Tremolo and Vibrato
By Johan Liljencrants

The Swedish dictionary of music 'Sohlmans Musiklexikon' is also in the
camp of Tremolo = AM (amplitude modulation), Vibrato = FM (frequency
modulation), though often coupled with AM.  In its 1st edition of
1948-1952 you find about the rotating valve mechanism of the Deagan
Vibraphone (my translation), "... whereby the tone from the beaten bars
becomes strongly tremulating (sic!) ..."

Same publication, 2nd edition of 1979, has a rewritten text: "...
a rapid variation in the strength of its sound, which is perceived (!)
as a vibrato."

A colleague at my lab, Eric Prame, looked at commercial CD recordings
of 'Ave Maria' by Schubert.  (Eric Prame: "Measurements of the vibrato
rate of ten singers", J. Acoust. Soc. Am. 96 (1994), pp 1979-1984.)
He found their vibrato rates to be narrowly confined in the range from
5.5 Hz (Pavarotti) to 6.7 Hz (Marian Anderson) in the long stationary
notes.  The extent was typically +/- 60 cents.  Three violinists used
the same rate but a significantly smaller extent [modulation depth],
say +/- 25 cents.  (100 cents = 1 semitone).  Eric's pet finding is
that the vibrato rate goes up a couple of Hz during the last few
vibrato cycles of a long note.

The vibrato rate is critical for its artistic value and tends to
decrease with age in a singer, more than once the cause to terminate
a career (by chevrotage = goat's bleating)!

Johan Liljencrants

 [ The frequency ratio between adjacent notes of the chromatic scale
 [ (one semitone) is 1.05946.  For convenience this interval is divided
 [ geometrically into 100 tiny intervals of ratio 1.000578.  So what
 [ does this sound like?  At 'A' = 440 Hz the piano tuner will count
 [ one beat in 4 seconds!  -- Robbie

(Message sent Wed 13 Oct 1999, 15:56:46 GMT, from time zone GMT+0100.)

Key Words in Subject:  Tremolo, Vibrato

Home    Archives    Calendar    Gallery    Store    Links    Info   

Enter text below to search the MMD Website with Google

CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2024 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Please Support Publication of the MMD with your Generous Donation

Pay via PayPal

No PayPal account required

Translate This Page