Aural pitch recognition teaching device

Details Aural pitch recognition teaching device Aural pitch recognition teaching device

1979-12-26

1981-06-16

Hix, L. T.

Music

Accessories

Tuning devices

84470R, 328141, 324 78D, G10G 702, G09B 1502

Patent

active

042730236

ABSTRACT:
Apparatus including amplifier and peak-detecting circuits receives an electrical signal representative of an aural tone containing a pitch to be determined and produces therefrom a pulse train having a pulse reoccurrence frequency (PRF) substantially equal to the pitch of the tone. The pulse-to-pulse period of the pulse train is measured by applying the pulse train to control circuits that alternately enable and disable digital counters clocked by a binary signal of a PRF substantially greater than that of the pulse train. The digital counters produce counts representative of the period of the pulse train which are decoded and applied to a display unit to provide a visual indication of the pitch contained in the received electrical signal.

REFERENCES:
patent: 3351939 (1967-11-01), Olsen
patent: 3886838 (1975-06-01), Scherrer
patent: 4019419 (1977-04-01), Yoshikawa
patent: 4198606 (1980-04-01), Baba

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