Music – Accessories – Tuning devices
Patent
1979-05-04
1982-03-16
Hix, L. T.
Music
Accessories
Tuning devices
84455, 324 99R, 324149, G10G 702
Patent
active
043195156
ABSTRACT:
A tuning aid for tuning musical instruments, particularly keyboard instruments, includes a sensor unit (12) which has an elongate capacitative sensor probe which is capable of extending across one octave of the instrument, and an octave switch (22) and a tone switch (20) on which are manually set the nominal octave and note of the string being measured. Amplifiers (16,24) including an AGC amplifier and controlled band-pass filters (18,26) are responsive to the octave and tone switches to select the measured tone. A divider (32) responsive to the octave switch divides the measured frequency by a power of two. A divider (38) is connected to the output of a crystal oscillator (36) to divide by a factor dependent upon the tone switch setting. The outputs of the two dividers are compared in a discriminator (34) which compares the two frequencies. A meter (50) displays the sense and magnitude of the discriminator output so as to display in terms of cents the amount by which the frequencies differ. A sample and hold circuit (46) actuated by the AGC circuit (28) causes the display to be held for a period of ten seconds, while operation is inhibited for the first 150 milliseconds of the note sounded.
REFERENCES:
patent: 3968719 (1976-07-01), Sanderson
patent: 4023462 (1977-05-01), Denov
patent: 4163408 (1979-08-01), Capano
Hix L. T,.
Schreyer S. D.
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