4,379,422 43.75.Tv POLYPHONIC ELECTRONIC MUSIC SYSTEM

Walter Munch and Dale M. Uetrecht, assignors to Baldwin Piano & Organ Company

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12 April 1983 (Class 84/1.19); originally filed 15 August 1977

"Claim 1--A polyphonic electronic music system for an electronic musical instrument having at least one manual of keys corresponding to the notes of the musical scale comprising: means for producing tone signals of frequencies corresponding to the notes of keys contemporaneously played on the manual of keys; and means for gating and filtering the tone signals to produce a different pattern of voices to be assigned to played notes depend- ing upon the number and sequence of keys played at any given time."-- DWM

4,380,185 43.75.Tv TALKING METRONOME

Gayle Holcomb, assignor to V-T Rhythms, Incorporated 19 April 1983 (Class 84/1.03); filed 16 November 1981

This electronic metronome not only provides an audible beat pattern to the performing musician at a controllable tempo, but also operates an elec- tronic speech synthesizer to generate an appropriate sequence of audible spoken numbers at the selected tempo and in synchronism with the conven- tional metronome beats.--DWM

along without Scotch brand tape. Similarly, if the Japanese continue to exploit its promise, the next generation will have become totally dependent upon carbon fiber. This patent is a case in point. Carbon fiber as an ingre- dient of loudspeaker cones seems fitting and proper. But a carbon fiber piezoelectric transducer? The answer is that sound engineering consider- ations have led to the inclusion of carbon fiber in this improved bimorph design. The goal is to make a better head-positioning servo for videotape recorders and the like.--GLA

4,359,659 43.88.Fx PIEZOELECTRIC SHOCK WAVE DETECTOR

Robert B. Phillips, assignor to Australasian Training Aids (Pty.) Li- mited

16 November 1982 (Class 310/335); filed in the United Kingdom 27 February 1979

This patent relates to a transducer assembly for use in detecting shock waves in air, such as are produced by the passage of supersonic projectiles. It employs a hemispherical head configuration that makes it more uniformly sensitive to shock waves arriving from a range of directions, and it employs a mounting configuration that provides a degree of isolation from support vibrations.--EEU

4,374,624 43.88.Dv SOUND EMITTING DEVICE FOR ELECTRONIC TIMEPIECE

Toshio Murata, assignor to Citizen Watch Company 22 February 1983 (Class 368/250); filed in Japan 8 September 1980

A very thin miniature moving-coil loudspeaker is described having a frequency response broad enough to reproduce synthetic speech signals. Not only that, but its design is such that the associated timepiece can be made shock and water resistant. Presumably the intelligibility of spoken time signals would be poor under water, but wait until next year.--GLA

4,376,233 43.88.Dv SECURING OF LEAD WIRES TO ELECTROACOUSTIC TRANSDUCERS

Yoshiyuki Kamon and Yoshihiro Yokoyama, assignors to Sony Cor- poration

8 March 1983 (Class 179/115.$ VC); filed in Japan 18 December 1980

Making good electrical connections to the voice coil of a microphone or loudspeaker might seem to be a mechanical problem but it is really an acoustical one. Apart from the effects of added mass or spurious resonances upon the performance of the transducer, flexible leads have a tendency to fatigue and break because of various vibrational modes that can be excited. The patent describes an arrangement well suited to tweeters in which the leads are bonded to the diaphragm with a stiff cement at the voice coil and a more flexible bonding agent near the periphery.•GLA

4,379,213 43.88.Ja ELECTROACOUSTICAL CONVERTER

Lutz Lennhardt, assignor to BM-Elektronik Meletzky KG 5 April 1983 (Class 179/115.5 R); filed in Federal Republic of Ger-

many 21 November 1979

This patent belongs to the general class of barrel-stave loudspeakers. A football-shaped form is made up of individual staves joined together with stretchable airtight membranes. If the football is squashed at one end the staves bow outwardly and the enclosed volume increases. Obviously, such a device can be used to generate sound. (Why it should bc will not be discussed

4,363,993 43.88. Fx PIEZOELECTRIC ELECTROMECHANICAL BIMORPH TRANSDUCER

Susumu Nishigaki, Kanji Murano, and Yoshihisa Watanabe, assign- ors to Sony Corporation

14 December 1982 (Class 310/332); filed in Japan 12 December 1979

For those of us who grew up in technologically advanced nations, it seems inconceivable that people in some parts of the world arc still getting

673 J. Acoust. Soc. Am. 74(2), August 1983; 0001-4966/83/080673-02500.80; ¸ 1983 Acoust. Soc. Am.; Patent Reviews 673

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