EP 0031019 B1 19840321 - STRING CHORUS CIRCUIT
Title (en)
STRING CHORUS CIRCUIT
Publication
Application
Priority
DE 2952113 A 19791222
Abstract (en)
[origin: US4354415A] An electronic musical instrument comprises a sound generator connected to a loudspeaker by way of several parallel channels including respective delay lines constituted by charge-transfer devices of the bucket-brigade type stepped by different high-frequency pulse generators. Each pulse generator comprises a voltage-controlled oscillator whose output frequency is varied by a composite periodic signal obtained from a respective stage of a chain of operational amplifiers each provided, except possibly for the first stage, with an RC network acting as a frequency-dependent phase shifter for a nonsinusoidal modulating signal consisting of at least two sub-audio-frequency components. The modulating signal may be synthesized from a plurality of stepped waveforms generated by the concurrent readout, at different sampling rates, of a set of amplitude values stored in a read-only memory.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
G10H 1/10 (2013.01 - EP US); Y10S 84/04 (2013.01 - EP US)
Citation (examination)
- DE 2337041 A1 19740131 - NIPPON MUSICAL INSTRUMENTS MFG
- DE 2607136 A1 19770825 - WERSI ELECTRONIC GMBH & CO KG
- DE 2814402 A1 19781012 - NIPPON MUSICAL INSTRUMENTS MFG
- US 4080861 A 19780328 - WHOLAHAN JOHN DOUGLAS
- DE 2309321 A1 19730913 - EMINENT NV
Designated contracting state (EPC)
FR GB IT NL
DOCDB simple family (publication)
EP 0031019 A1 19810701; EP 0031019 B1 19840321; DE 2952113 A1 19810702; DE 2952113 C2 19830519; JP S56102892 A 19810817; US 4354415 A 19821019
DOCDB simple family (application)
EP 80106892 A 19801108; DE 2952113 A 19791222; JP 18272780 A 19801222; US 21881580 A 19801222