Device for improving piano tone quality

Details Device for improving piano tone quality Device for improving piano tone quality

1981-08-25

1983-12-27

Isen, F. W.

Music

Instruments

84 119, G10H 300

Patent

active

044223609

ABSTRACT:
An amplifier circuit for automatically altering in a controlled way the reproduced tones of an electronic piano comprises a main signal path for the fundamental tones and an overtone path including a plurality of tone altering electronic networks and field effect transistor amplifiers combining the networks. The circuit includes separate controls for manual adjustment of normal level gain, bass boost, overtone, output volume and gate control threshold. A mixer recombines the main path and the overtone path. A gate circuit may be provided to disable the overtone path when no signal is present in the main path over a predetermined minimum threshold. The entire device is constructed for mounting over the keyboard of the piano, with a panel for the controls which renders them readily accessible for regulation by the musician to obtain the desired improvement and alteration of the tones put out by the piano.

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patent: 4236434 (1980-12-01), Nishibe
patent: 4274321 (1981-06-01), Swartz

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