Accession Number : AD0703640

Title :   AN INTEGRATED-CIRCUIT PIANO TUNER FOR THE EQUAL-TEMPERED KEYBOARD EMPLOYING A TUNEABLE FIXED-COEFFICIENT DIGITAL FILTER.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Hagee,Michael William

Report Date : JUN 1969

Pagination or Media Count : 96

Abstract : 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. (Author)

Descriptors :   (*MUSIC, TUNING DEVICES), (*SOUND PITCH, TUNING DEVICES), ELECTRIC FILTERS, DIGITAL SYSTEMS, INTEGRATED CIRCUITS, THESES

Subject Categories : Humanities and History
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE