Acoustic encoding apparatus

Communications: electrical – Audible indication – Percussion-type sound producer

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Details

73584, 310323, 310328, 310339, 340365A, 340365S, G06F 302, H04L 1503

Patent

active

043785522

ABSTRACT:
Encoding apparatus for a business machine includes a resilient striker for inducing diverging sound waves within a rod by impact with it at a given location. Transducers positioned along the rod on each side of the striker and at unequal distances from it, convert the sound wave fronts into a first and a second output signal having a predetermined time interval between them which is dependent upon the location of impact with the rod. The transducers are connected to a logic unit which includes an oscillator-driven binary counter. The first output signal starts the counter and subsequent arrival of the second output signal determines the elapsed time, the counter output at that instant being a binary code value usable for any desired purpose: control, display, etc. The encoding apparatus may be incorporated in a keyboard having a number of keys and a corresponding number of strikers differentially positioned along the rod such that each key produces output signals with a predetermined time interval between them and accordingly a unique binary code may be obtained upon actuation of each key.

REFERENCES:
patent: 3134099 (1964-05-01), Woo
patent: 3353038 (1967-11-01), Mason et al.
patent: 3464531 (1969-09-01), Herr et al.
patent: 3647962 (1972-03-01), Whetstone
patent: 3725908 (1973-04-01), Brisebarre et al.
patent: 3846580 (1974-11-01), Brenner
patent: 3976899 (1976-08-01), Fanshawe
"Electronic Keyboard", Lisk, IBM Technical Disclosure Bulletin, Jun. 1977, p. 259.
"Ripple-Sensing Keyboard", Arosenius, IBM Technical Disclosure Bulletin, Mar. 1972, p. 3199.
"Acoustical Touch Panel", Fajans, IBM Technical Disclosure Bulletin, Dec. 1977, p. 2925.
"Accoustically . . . Wire," Booth et. al., IBM Technical Disclosure Bulletin, Mar. 1978, p. 4188.

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