Rockin’ Patent – TONUS Inc’s “Music Synthesizer Keyboard”
Rockin’ Patent: US Patent No. 3,665,089 Filed: 17 December 1970 In the name of: TONUS Inc Title: Music Synthesizer Keyboard What’s claimed: “In an electronic system, in combination: means for providing a plurality of voltages of different values; means for selecting at least two of said voltages substantially simultaneously; means for providing a reference voltage; means for deriving a difference signal from the values of said reference voltage and one of the selected voltages; means for deriving an output signal from the values of said difference signal and the other of said selected voltages; and means for generating two signals having […]
