Music – Instruments
Patent
1979-06-15
1982-09-28
Truhe, J. V.
Music
Instruments
84 124, 84 11, 84 127, 84 21, 84462, G10H 303, G10H 102, G10G 304, G10F 102
Patent
active
043512216
ABSTRACT:
A player piano recording system has photosensor flags secured to the undersides of the piano keys, vertical movement of which is detected by horizontally adjustable photosensors to produce "key played" and key velocity signals which supplied to a microprocessor for deriving expression signals for recording on magnetic tape. The microprocessor provides output expression values and key play information. According to the invention, the expression values are a direct function of key velocity and key play information and switch selected boost (an enhanced initial frame expression for overcoming solenoid inertia) and add (for trill) values. Key play data is dependent upon key play inputs and the frame extension switch value. The unique structure of the key flag permits horizontal adjustment of the photosensors for vertical misalignments etc. of the piano keys. Player piano tapes prepared by use of the invention may be used directly to control player pianos or as master tapes for the production of commercial cassette tapes for consumer use with commercially available tape controlled player pianos.
REFERENCES:
patent: 3049957 (1962-08-01), Krug
patent: 3965790 (1976-06-01), Suzuki et al.
patent: 4023456 (1977-05-01), Groeschel
patent: 4067253 (1978-01-01), Wheelwright et al.
patent: 4135428 (1979-01-01), Campbell
patent: 4172403 (1979-10-01), Campbell et al.
patent: 4174652 (1979-11-01), Campbell
patent: 4176578 (1979-12-01), Campbell et al.
Henson Ernest D.
Sharp James M.
Starnes Roger L.
Wilkes Thomas J.
Isen Forester W.
Teledyne Industries Incorporated
Truhe J. V.
Zegeer Jim
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