Arnold E Christensen

US Patent:

50241320, Jun 18, 1991

Filed:

Nov 27, 1989

Appl. No.:

7/441711

Inventors:

Michael Anthony - Glendora CA
Craig A. Ohler - Brea CA
Arnold Christensen - Costa Mesa CA

International Classification:

G10D 314
G10G 702

US Classification:

84312R

Abstract:

An electronic tuner generates a pulse train signal from an analog signal transduced from vibrations on a selected one of several strings of a musical instrument. The pulse train signal has a plurality of successive pulses, each of the pulses having a pulse width which may vary between successive pulses. Two of the pulses have a longest pulse width of all pulses in the pulse string are identified. The tuner then computes a current fundamental frequency on the selected string as a function of a ratio between a numerical count of the pulses occurring between these two pulses, the count including one of these pulses, and a sum of the pulse width of each of the pulses included in the count. The two of the pulses have a longest pulse width of all pulses in the pulse string. A difference signal is developed as a function of a difference between the current fundamental frequency and a known in-tune frequency associated with the selected string being tuned.