Music – Accessories – Tuning devices
Patent
1982-02-03
1984-02-07
Perkey, William B.
Music
Accessories
Tuning devices
84477R, 324 78D, G10G 702, G01R 2302
Patent
active
044296096
ABSTRACT:
Device and method for measuring the pitch of a musical sound and displaying the pitch and the pitch error. The device consists of analog signal processing circuitry and digital computing and display circuitry. The analog signal processing circuitry accepts a signal from an appropriate signal source, amplifies the signal if necessary, removes those frequency bands which are outside the area of interest, and generates a digital reference signal which represents zero-crossings of the analog signal. The digital computing circuitry performs an analysis using the zero-crossing time data and determines the fundamental pitch of the input signal. This is accomplished by, in effect, delaying the digital reference signal by successive amounts corresponding to the intervals between zero crossings, and correlating the effectively delayed signals with the digital reference signal. A high correlation corresponds to a delay which is near an integer number of periods. Additionally, the digital computing circuitry converts the pitch information into appropriate display driving signals which are buffered if necessary before they are applied to the display device itself.
REFERENCES:
patent: 4028985 (1977-06-01), Merritt
patent: 4217808 (1980-08-01), Slepian
patent: 4271746 (1981-06-01), Dobbie
patent: 4351216 (1982-09-01), Hamm
patent: 4354418 (1982-10-01), Moravec
WO81/01898, Roses, Jul. 1981, WIPO.
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