An integrated-circuit piano tuner for the equal-tempered keyboard employing a tuneable fixed-coefficient digital filter
By: Michael William Hagee
Publisher: Naval Postgraduate School
Published: 1969
Place of publication: Monterey, California
Language: eng
Format: Electronic resource
Number of pages: 96
Subjects: Digital filters (Mathematics); Digital Electric filters; Integrated circuits
Description: A study of the physics of the piano reveals that while the upper partials of the steel strings are the eigen-frequencies of the complex tone, they are not integer multiples of the respective fundamentals. To properly measure and tune these eigen-partials, a digital filter capable of sweeping a major portion of the audio-frequency spectrum had to be implemented. Such a filter, a tuneable fixed-coefficient digital filter, is discussed as well as a simple pole-zero design procedure for determining the required coefficients. Each module, including the frequency deviation detector and counter, the time-base generator, the digital filter, the reference frequency generator and the display and control module, of the proposed tuner is illustrated and discussed.
Notes: Thesis advisor: James S. Demetry.

Thesis (M.S. in E.E.)--Naval Postgraduate School, 1969.

Bibliography: p. 90-94.

"Approved for public release, distribution unlimited."-Cover.

Also available in print.

Mode of access: World Wide Web.

System requirements: Adobe Acrobat reader.

Record updated 02/14/05.  PA