a piece of music alone and at any desired pace, and then while manually rendering the righthand, or solo, portion of the music. The chords are played by simply depressing a single control button whenever the next chord in the stored series is required. A further feature of the invention is the ability to store sets of switch or tab or other selector element settings for later recall."-DWM

4,131,049 43.75.Tv ELECTRONIC MUSICAL INSTRUMENT

HAVING MEMORIES CONTAINING WAVESHAPES

OF DIFFERENT TYPE

signals containing information concerning keys originally played, the width of the pulses in the sequence is modulated according to the velocity with which the keys were played. The solenoids which actuate the piano keys during playback respond to the individual pulse energy in order to give "expression" to the reproduced music. The circuit of this patent permits simultaneous adjustment of both the leading and trailing edge of the pulses without varying the rate of the pulses.-DWM

4,136,595 43.75.Tv SINGLE BUS KEYBOARD

Takatoshi Okumura and Shimaji Okamoto, assignors to Nippon Gakki

26 December 1978 (Class 84/1.01); filed in Japan 6 October 1975

For a digital electronic musical instrument this patent recognizes

KEY50ARD •

DEPR E SSE D KEV DETECTION

KEY ASSIGNER

Timothy C. Gillette, assignor to ARP Instruments, Incorporated

30 January 1979 (Class 84/1.01); filed 19 October 1976

For electronic music synthesizers of the voltage controlled type using a resistor stri•ng connected in series with a constant current source, and keyswitches which, when depressed, "short" one or more resistors in the string, an additional resistor is included in the string to provide a unique output signal when no keys are depressed. A control gate allows voltage sample outputs to be transmitted from the circuit only when keys are depressed. A level change detector samples the keyboard voltage in response to each change of condi- tior• and controls the frequency of the voltage controlled oscillator. -DWM •

TONE COLOR SELECTION

1 SYSTEM

the deficiency of synthesizing waveforms from a finite number of stored sinusoidal harmonic components by storing one or more additional components at the fundamental frequency, having com- plex waveform (triangular, sawtooth, or rectangular) containing abundant harmonic components. A mixing circuit is provided for adding the components in the desired relative amplitudes.-DWM

43.75.Tv

ORGANS

4,137,809 ARPEGGIO SYSTEM FOR ELECTRONIC

David A. Bunget, assignor to D. H. Baldwin Company 6 February 1979 (Class 84/1.03); initially fried

30 December 1970

"Claim 12. An arpeggio generator for an electronic organ, com- prising an array of keys, means responsive solely to simultaneous actuation of any plurality of said keys from 2 to 5 for calling forth tones corresponding with all said plurality of said keys sequentially in an up-down sequence of equal time intervals and in increasing followed by decreasing orders of frequencies." This is one of 36 claims which include several obtained through patent interference proceedings from patent 3,842,184 previously reviewed [J. Acoust. Soc. Am. 61, .1668 (1977)].-DWM

4,141,270 43.75.Tv MODULATED KEYER SUPPLY SAMPLING CIRCUIT

Ray B. Schrecongost, assignor to Hammond Corporation 27 February 1979 (Class 84/1.24); fried 23 June 1977

In a harmonic synthesis type of electronic organ using chopper keyers, a sampling network samples the drawbar inputs to the keyer circuits to produce a modulated waveform which may be used for percussion or other separate channel effects without requiring separate keyer circuits.-DWM

4,135,428 43.75.Tv CIRCUIT FOR CONTROLLING THE EXPRES-

SION OF AN ELECTRONICALLY CONTROLLED KEYBOARD INSTRUMENT

Joseph M. Campbell, assignor to Teledyne Industries, Incorporated

23 January 1979 (Class 84/1.24); fded 2 May 1977

In an electronic player piano responding to stored multiplex

4,142,434 43.75.Tv CIRCUIT ARRANGEMENT FOR ELEC-

TRONIC MUSICAL INSTRUMENTS

Ulrich Gross, assignor to U.S. Philips Corporation 6 March 1979 (Class 84/1.01); filed in Germany

23 July 1974

In electronic organs containing electronic synthesizers the organ generator frequencies are usually fixed and the monophonic synthe-

1610 J. Acoust. Soc. Am. 65(6), June 1979; 0001-4966/79/061610-02500.80 ¸ 1979 Acoust. Soc. Am.; Patent Reviews 1610

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