4,481,856 43.75.Tv STRINGED INSTRUMENT FOR ATTACHMENT TO AN ELECTRONIC TRANSDUCER

Robert S. Grawi, New York, NY 13 November 1984 (Class 84/173); filed 7 September 1982

This musical instrument consists of a frame 12 having a U-base 13 with cross-members 20 and 22, and an elongated member 24, upon which a three-dimensional pattern of strings 11 is stretched across bridge 46

IO

• •4 42

66

20

between terminations 28 and tuning screws 42. A transducer 62 under bridge 46 supplies electrical tone waves for amplification. The player holds the instrument by gripping the ends of the U bar with both hands, and plays the instrument by plucking the nearby strings.--DWM

-48

stated to provide an increased frequency response range. The diaphragm is pressed directly against the skin or clothing of the patient.--SFL

4,382,328 43.88.Bs METHOD OF MAKING STATIONARY

ELECTRODES FOR ELECTROSTATIC TRANSDUCERS

Arthur A. Janszen, Belmont, MA 10 May 1983 (Class 29/594); filed 2 January 1981

The inventor is well known for his development of high-quality electro- static loudspeaker designs. This patent describes a new method for making stationary electrodes that provides a high degree of dielectric protection and tight manufacturing tolerances, yet is relatively simple and inexpensive.-- GLA

4,464,968 43.75.Tv SYSTEM FOR STORING AND READING OUT MUSICAL TONE SIGNALS

Hideo Onoye, assignor to Victor Company of Japan 14 August 1984 (Class 84/1.28); filed in Japan 3 June 1982

This digital system for storing and reading out musical tone signals uses a high sampling rate at onset of a musical tone and reduces the sam- pling frequency with time, on the assumption that the high-frequency har- monics are attenuated with time more rapidly than the low-frequency har- monics. This assumes a particular type of percussive tone spectrum. The purpose is to reduce the required memory capacity for storage.--DWM

4,471,658 43.88.Dv ELECTROMAGNETIC ACOUSTIC TRANSDUCER

Kazuo Morimoto, assignor to Mitsubishi Jukogyo Kabushiki Kaisha 18 September 1984 (Class 73/643); filed in Japan 22 September 1981

The transducer in question is used for inspecting for defects in tubing using ultrasonic excitation. An improvement over prior art is described which provides greater efficiency and does not require rotation of the trans- ducer during operation.--GLA

4,467,689 43.75.Tv CHORD RECOGNITION TECHNIQUE

Glenn R. Stier and Mark J. Fimoff, assignors to Norlin Industries, Incorporated

28 August 1984 (Class 84/1.03); filed 22 June 1982

According to this patent the system of earlier patent 4,248,118 [re- viewed J. Acoust. Soc. Am. 74, 1316 (1983)] sometimes gave erroneous musical chord recognitions resulting, for example, "from the sloppy release of the keys operated to sound a given chord." The present patent describes a system for minimizing this occurrence by storing the number of keys being played at a given time, then recognizing a new chord type only if the per- former is operating the same or a greater number of keys than the number stored.•DWM

4,475,619 43.80.Qf STETHOSCOPE WITH FLOATING DIAPHRAGM

4,473,722 43.88.Dv ELECTROACOUSTIC TRANSDUCERS

Raymond J. Wilton, assignor to Knowles Electronics Company 25 September 1984 (Class 179/114 A); filed 7 January 1982

A balanced armature transducer is shown that has a pole piece formed of a stack of high permeability laminations. A tunnel is formed by openings in the laminations in which the vibratable end of a reed armature can vibrate

19• 13 '15

•3

Thomas J. Packard, assignor to Minnesota Mining and Manufactur- ing Company

9 October 1984 (Class 181/137); filed 24 March 1983

A stethoscope head has a diaphragm with a free-edge support that is

between a pair of permanent magnets. The reed is the central leg of an E- shaped armature. The outer legs are fastened to surfaces formed by wings on the laminations. The surfaces are so dimensioned that the reed is accurately centered in the air gap between the magnets.•SFL

1634 J. Acaust. Sac. Am. 77(4), April 1985; 0001-4966/85/041634-01500.80; ¸ 1985 Acaust. Sac. Am.; Patent Reviews 1634

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 131.91.169.193 On: Fri, 21 Nov 2014 23:35:33