an automatic rhythm unit. In this patent, chord sensors are pro- vided for each key of music so that when any simple chord is played a suitable selection of tones (e.g., root and fifth) will be identified for automatic rhythmic tonal accompaniment. Additional provision is made for the circumstance in which only a single playing key is depressed instead of a chordal group. In such a case, the key played is automatically identified as the root of the chord from which the selected notes are chosen for the automatic accompaniment. This insures that automatic accompaniment will be uninterrupted, whether a single key or a group of keys is played.-DWM

type of auditorium where listeners seated behind the instrument would otherwise be at a disadvantage. There is provision (24,25,26) for holding the lower edge of the reflector off the floor while the piano is being moved on or off stage.-DWM

4,203,338

43.75.Tv TRUMPET AND SYNTHESIZER APPARATUS

CAPABLE OF POLYPHONIC OPERATION

Pat Vidas, Wantagh, New York 11793 20 May 1980 (Class 84/1.14); filed 4 June 1979

This trumpet is connected to an electronic music synthesizer in several ways. Microphone 14 built into mouthpiece 12 provides in- put signal to a preamplifier from which a synthesizer frequency con- trol signal is derived through a pitch-follower circuit and a "pitch-to- voltage" converter. This enables the synthesizer tone output fre- quency to track the trumpet tone frequency, or to deviate from it

by controlled amounts. Mounted upon the trumpet are two rotary potentiometer controls 20,21 which can be operated by the trum- peter's left hand as it supports the instrument for normal playing. These potentiometers are connected to modulation and frequency control circuits in the synthesizer. Other remote synthesizer con- trols 26 may be mounted upon the instrument for transposition or "glide" tonal effects. The instrumen-t 10 is otherwise played in a normal manner by operating piston valves 11.-DWM

4,2O5,576

43.75.Tv AUTOMATIC HARMONIC INTERVAL KEYING

IN AN ELECTRONIC MUSICAL INSTRUMENT

Ralph Deutsch and Leslie J. Deutsch, assignors to Kawai Musical Instrument Manufacturing Company

3 June 1980 (Class 84/1.17); filed 12 October 1978

This electronic musical instrument is in the category which auto- matically provides harmony tones in response to the keying of single melody tones. The position of the harmony tone or tones may be determined either from stored musical interval information selected

in accordance with the key in which the music is being played, or by the position of the next lowest notes being played on another key- board such as the accompaniment manual of the instrument.- DWM

4,206,676

43.75.Tv ELECTRONIC MUSICAL INSTRUMENT WITH

SEQUENCER FOR AUTOMATIC ARPEGGIO

PERFORMANCE

Takeshi Adachi, Masahiko Koike, and Haruyuki Suzuki, assignors to Nippon Gakki

10 June 1980 (Class 84/1.03); filed in Japan 3 June 1977

This electronic musical instrument is of the type using tone sig- nal generators having frequencies which are voltage-controlled. The patent is concerned with automatic arpeggio performance by means of "a sequencer for sequentially coupling memorized pitch voltage signals to the voltage-controlled tone signal generating circuit ar- rangement, thereby realizing automatic arpeggio performance. The sequencer is so connected as to receive a pitch determining voltage signal from the keyboard circuit at a given timing and is so arranged that the magnitudes of pitch voltage signals coupled to the tone sig- nal generating circuit arrangement are shifted in accordance with the pitch determining voltage signal from the keyboard circuit, thus achieving transposition of arpeggio."-DWM

4,204,453

43.75.Tv DEVICE FOR AUTOMATIC TONAL

ACCOMPANIMENT IN ELECTRONIC MUSICAL

INSTRUMENTS

Ulrich Gross, assignor to U.S. Philips Corporation 27 May 1980 (Class 84/1.24); filed in Germany

29 December 1976 ,

This automatic tonal accompaniment device for electronic musi- cal instruments is of the type which produces pre-determined se- quences of tones selected from a played chord in synchronism with

4,205,580

43.75.Tv ENSEMBLE EFFECT IN AN ELECTRONIC MUSICAL INSTRUMENT

Ralph Deutsch, assignor to Kawai Musical Instrument Manufacturing Company

3 June 1980 (Class 84/1.24); filed 22 June 1978

An ensemble effect is produced in a digital tone generator by providing a master data set of words having values corresponding to the relative amplitudes of equally spaced points along one cycle of the waveform of the audio tone. These values are transferred se-

quentially during repetitive cycles at a rate proportional to the pitch (frequency) of the desired musical tone to a digital-to-analog convet-

1237 J. Acoust. Soc. Am. 68(4), Oct. 1980; 0001-4966/80/101237-02500.80; ¸ 1980 Acoust. Soc. Am.; Patent Reviews 1237

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