Music – Accessories – Teaching devices
Patent
1983-12-30
1985-04-16
Perkey, William B.
Music
Accessories
Teaching devices
324 77A, 324 77B, G10G 100, G09B 1502, G01R 2316
Patent
active
045108404
ABSTRACT:
An input audio signal is AD converted into digital data which is processed by a central processing unit (CPU) in which Fast Fourier Transform (FFT) operation and power spectrum calculation are effected. Furthermore, spectrum data obtained in this way is processed to obtain a fundamental tone to determine the pitch of each sound of the input audio signal. After the pitch is determined, data indicative of a given pattern is produced so that a musical note is indicated at an appropriate position on a staff displayed on a screen of a display unit. Such data from the CPU is fed via a video display processor to a video RAM to be stored therein where the video display processor produces a video signal fed to the display unit in turn. Since the fundamental tone does not necessarily have the highest level within the spectrum of the input audio signal, various ways for accurate determination of the pitch are used. Furthermore, a reference pitch preset in the musical note display device may be changed so as to be equal to a reference pitch emitted from a musical instrument or the like by changing sampling frequency of sampling pulses fed to an AD converter.
REFERENCES:
patent: 4078469 (1978-03-01), Calvin
patent: 4366741 (1983-01-01), Titus
patent: 4377961 (1983-03-01), Bode
patent: 4399732 (1983-08-01), Rothschild
patent: 4429609 (1984-02-01), Warrender
patent: 4434697 (1984-03-01), Roses
Inami Mamoru
Otsuki Zenju
Tanaka Yoshiaki
Perkey William B.
Victor Company of Japan , Limited
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