GENERATORS

••_l, VC3 VC4 ......

•AMPLERS

ß '-Sa _j

piers SPI-SPn at frequencies FI-Fn so chosen that the frequency differences from 1 O0 kHz correspond to the notes which are to be reproduced by the samplers. The purpose, to produce a full scale of tones having the same highly complex waveshape, may turn out to be a serious compromise to the inventor's desire to simulate the many voices of a conventional pipe organ, because spectral analy- sis reveals that pipe tones typically change in waveshape (and spectrum) from one end of the rank to the other.-DWM

4,292,875

43.75.Tv STRAIN-GAUGE SOUND PICKUP FOR STRING INSTRUMENT

Carl-Ernst Nourney, D•sseldorf 12, Germany 6 October 1981 (Class 84/1.14); fried in Germany 25

August 1977

"The strings of a musical instrument, e.g., a guitar, are indiv- idually supported on an instrument body by webs of a hard but elastic polymeric material which are free to vibrate in the longitud- inal direction of the strings and carry respective strain gauges

crates a digital control signal in the form of an amplitude function of time suitable for the onset, sustain, and decay of a percussive tone. "Sampling is executed on the envelope waveshape by means of these pulse signals, and polarities of sample values are converted into reference to these pulse signals for generation of a correspond- ing musical tone waveshape." Alternate reversals of the pulses in the (upper) scanned envelope produce the tone wave shown in the lower graph.-DWM

4,297,935 '

43.75.Tv DIVIDER KEYER CIRCUIT FOR

SYNTHESIS ORGAN

Ray B. Schrecongost, assignor to Marmon Company 3 November 1981 (Class 84/1.01); filed 24 February

1978

This organ circuit containing four integrated circuit chips sub- stitutes for the electromagnetic tone generator set of a Hammond type synthesis organ with harmonic draw bars. Each of the four identical 40-pin integrated circuit packages contains keyer circuits in groups each coupled to a different input waveform and to a different harmonic drawbar control line. A large amount of on- chip cross wiring is used to minimize electronic assembly labor.- DWM '

whose direction of maximum sensitivity includes an acute angle with that longitudinal direction and with the underlying body sur- face. The webs may be integral with or bonded onto a more massive bridge or bridge section and have gable-shaped tops carrying the strain gauges."-DWM

4,296,663

43.75.Tv ELECTRONIC MUSICAL INSTRUMENT

Masanobu Chibana, assignor to Nippon Gakki 27 October 1981 (Class 84/1.01); filed in Japan

14 September 1978

Depression of a playing key in this digital electronic musical instrument initiates the generation of two pulse-type tone signals having the same identical musically appropriate tone frequency, but differing by a constant phase angle; and simultaneously gen-

4,308,422

43.75.Tv, 43.88.Ja CIRCUIT FOR MODULATING A MUSICAL TONE SIGNAL TO PRODUCE A ROTATING

EFFECT

George F. Schmoll, III, assignor to CBS Incorporated 29 December 1981 (Class 179/15); filed 26 December

1979

Both this patent and 4,308,428 (reviewed below), filed con- currently and assigned to the same company, are in the category of multi-channel, electronic-modulation, electroacoustic systems in- tended to simulate closely the auditory effect produced by radiat- ing electronic musical tone signals through a loudspeaker which rotates with orbital velocity about a vertical axis in a horizontal plane. This latter system is generally known by the name of inven- tor Don Leslie who commercialized the system, although A. N. Goldsmith was an earlier inventor. In the present case the tone sig- nals radiated by loudspeaker 40 in channel C pass through variable

1061 J. Acoust. Soc. Am. 71 (4), April 1982; 00014966/82/041061 •32500.80; ¸ 1982 Acoust. Soc. Am.; Patent Reviews 1061

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