4,053,051

43.66.Vt EARPLUG PACKAGE AND METHOD

MAKING IT

Carl H. Brinkhoff, assignor to Mine Safety Applicances Company

11 October 1977 (Class 206/438); filed 10 September 1976

This patent describes an earplug made from fibers about two mi- crons in diameter (a dimension finer than that of cotton), and it is stated to have better sound exclusion properties. Suitable fibers are polypropylene fiber or glass fibers known as Swedish wool. A mat is formed from the fibers and inserted into the ear canal by a specially designed sleeve and plug system.-RWC

4,104,743

43.66. Vt DEVICE FOR SAFETY-HE LMET WITH EAR

MUFFLERS

Erik B•ttger, Oslo 4, Norway 8 August 1978 (Class 2/243); filed 16 February 1977

This patent describes a mounting system for ear-muff-type protec- tors by which such muffs are mounted on a doubly pivoted bearing; they can be moved forward or backward for comfort, and swung and retained outward when not needed.-RWC

4,149,441

43.75.Tv ELECTRICAL MUSICAL INSTRUMENT

Sune H. Bergman, Kallered, Sweden, and Eric U. Seger, Goreborg, Sweden

17 April 1979 (Class 84/1.03); filed in Sweden 17 December 1974

"Claim 1. A manually played electrical musical instrument com- prising the combination of means for generating electrical signals cor- responding to musical notes in a plurality of tonalities, members adapted to select signals from said signal generating means for repro- ducing corresponding notes in a sound reproducing apparatus, and a circuit adapted at repeated actuation of an electrical contact operable by the player to select from said signal generating means a sequence of notes in each tonality, said sequence comprising at least four notes including the fundamental, the fifth and the third and at least one additional note in the note scale corresponding to a predetermined tonality."-DWM

single key. The purpose of this patent is to retain such automatic features when the playing mode of the instrument is switched to the playing of all keys in a chord, instead of playing a single key, so that the novice will not lose the benefit of the automatic features when he

upgrades his manual performance capability. This is accomplished by a combination of keyboard logic circuits.-DWM

4,154,132

43.75.Tv RHYTHM PATTERN VARIATION DEVICE

Toshio Mishima, assignor to Kawai Gakki 15 May 1979 (Class 84/1.03); filed in Japan 7 August 1976

Some previous rhythm pattern generators have repeated a rhythm pattern of one or more musical measures which has been selected from a variety of patterns stored in a read-only memory. Typically an address counter is actuated by a rhythm clock, and the output of address signals directs the read-only memory in the production of gate control signals, which key different tone sources on at different instants during the measure. A wide variety of rhythm patterns re-

ROM RHYTHM ' 17 TONE PAT TERN SOURCE !

CTR.

+v

RHYTHM SELECT GATE 8

CLOCK GEN.

I TONE SOURCE

SHIFT REGISTER

quires a read-only memory of considerable storage capacity. In this patent, it is possible either to reduce the storage capacity of the read- only memory or to increase the versatility of the rhythm patterns stored, by providing a rhythm pattern variation device, which branches the produced rhythm pattern to two lines; introduces a desired time lag into one of these two lines; and combines the direct rhythm pattern and the delayed rhythm pattern in the production of a composite rhythm.-DWM

4,152,965

43.75.Tv ORGAN CIRCUIT AND METHOD OF

OPERATION

Stephen L. Howell, assignor to Kimball International, Incorporated

8 May 1979 (Class 84/1.03); filed 8 July 1977

Organs containing single-key, easy-play features for novices often provide for the automatic sounding of appropriate bass tones or for "fill-in" tones to sound in another manual division of the organ. These extra tones correspond to notes in the chord played by the

4,156,380

43.75.Tv MUSICAL INSTRUMENTS

Truxton K. Fulton, Danville, Virginia 29 May 1979 (Class 84/171); filed 3 August 1976

This is an electromechanical system for playing from a keyboard a set of stretched strings, in the manner of an electric guitar, through the use of solenoids both for fretting the strings to an appropriate vi- brating length and for plucking the strings to produce the tonal vi- brations. The distinguishing feature over the abundant prior art men- tioned is the provision of an electronic selector system which deter- mines which of the strings capable of producing the desired tone is used in the production of that tone.-DWM

366 J. Acoust. Soc. Am. 67(1 ), Jan. 1980; 0001-4966/80/010366-01500.80; ¸ 1980 Acoust. Soc. Am.; Patent Reviews 366

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