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Publication numberUS3890602 A
Publication typeGrant
Publication dateJun 17, 1975
Filing dateOct 23, 1973
Priority dateOct 25, 1972
Also published asDE2353502A1, DE7338355U
Publication numberUS 3890602 A, US 3890602A, US-A-3890602, US3890602 A, US3890602A
InventorsOkumura Takatoshi, Takeda Toshio, Tomisawa Norio, Uchiyama Yasuji
Original AssigneeNippon Musical Instruments Mfg
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Waveform producing device
US 3890602 A
Abstract
A single resistor bar having a plurality of connection points is formed by a diffused layer on a semiconduuctor substrate. A predetermined voltage is applied across the resistance layer so that the respective connection points exhibit different potentials. A decoder designates, via a reading switch circuit and successively at a predetermined time rate and order, which of the potentials to read out. Thus sequentially read-out voltages constitute a waveform of a particular tone color or an envelope of a particular shape. The decoder and the reading switch circuit may be formed by MOS transistors, and the circuits thus formed may be combined together with the resistance layer in an integrated structure on the semiconductor substrate.
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United States Patent [191 Tomisawa et al.

[ 1 June 17, 1975 WAVEFORM PRODUCING DEVICE [73] Assignee: Nippon Gakki Seizo Kabushiki Kaisha, Shizuoka, Japan [22] Filed: Oct. 23, 1973 [21] Appl. No.: 408,430

[30] Foreign Application Priority Data [58] Field of Search". 340/173 R, 173 SP, 173 DR; 338/17, 22 SD 3,735,367 5/1973 Bennett 340/173 R Primary ExaminerTerre11 W. Fears Attorney, Agent, or Firm-Holman & Stern [57] ABSTRACT A single resistor bar having a plurality of connection points is formed by a diffused layer on a semiconduuctor substrate. A predetermined voltage is applied across the resistance layer so that the respective connection points exhibit different potentials. A decoder designates, via a reading switch circuit and successively at a predetermined time rate and order, which of the potentials to read out. Thus sequentially readout voltages constitute a waveform of a particular tone color or an envelope of a particular shape. The decoder and the reading switch circuit may be formed by MOS transistors, and the circuits thus formed may be combined together with the resistance layer in an integrated structure on the semiconductor substrate.

[56] References Cited UNITED STATES PATENTS 8 Claims, 29 Drawing Figures 3.721.964 3/1973 Barrett 340/173 R GND(OV) Elm-4v AMPLITUDE l g H :1'1111111:ijilillilij; 21; 2

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Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3721964 *Feb 18, 1970Mar 20, 1973Hewlett Packard CoIntegrated circuit read only memory bit organized in coincident select structure
US3735367 *Apr 29, 1970May 22, 1973Currier Smith CorpElectronic resistance memory
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4048626 *Dec 29, 1975Sep 13, 1977Honeywell Information Systems Inc.Memory device
US4160244 *Feb 25, 1976Jul 3, 1979National Semiconductor CorporationConversion circuit
US4409877 *Jul 14, 1981Oct 18, 1983Cbs, Inc.Electronic tone generating system
US4668932 *Jul 26, 1985May 26, 1987Xicor, Inc.Nonvolatile reprogrammable electronic potentiometer
US6555996Nov 13, 2001Apr 29, 2003Xicor, Inc.High-resolution, high-precision solid-state potentiometer
US6873955 *Sep 22, 2000Mar 29, 2005Yamaha CorporationMethod and apparatus for recording/reproducing or producing a waveform using time position information
EP0016605A1 *Mar 12, 1980Oct 1, 1980National Semiconductor CorporationIntegrated circuit resistance ladder
WO1987000710A1 *Jul 25, 1986Jan 29, 1987Xicor IncNonvolatile reprogrammable electronic potentiometer
Classifications
U.S. Classification365/46, 338/22.0SD, 257/E27.16, 984/391, 257/E27.47
International ClassificationH01L27/06, H01L27/08, G10H7/02, H03M1/00
Cooperative ClassificationH03M2201/522, H03M1/00, H03M2201/8132, H01L27/0802, H03M2201/4135, G10H7/02, H03M2201/4225, H01L27/0629, H03M2201/3142, H03M2201/3131, H03M2201/523, H03M2201/4233, H03M2201/01, H03M2201/8156, H03M2201/3168, H03M2201/4279, H03M2201/3136, H03M2201/52, H03M2201/3115
European ClassificationH01L27/08B, G10H7/02, H03M1/00, H01L27/06D4V