PICTURE

8 10 6

• .296" -• .301"

conventional analog motion picture sound reproduction equipment, or with the separate digital audio signal source which is capable of providing a wider dynamic range than the analog optical system. In order to minimize the additional equipment needed to supplement the digital audio source, the source is designed to supply signal outputs to the photocell playback inputs of the analog system at the same level and impedance used for the photocell outputs.--DWM

5,080,189

43.88.Pf ELECTRO-HYDRAULIC DIPOLE VIBRATOR

Jack H. Cole, assignor to Conoco, Incorporated 14 January 1992 (Class 181/106); filed 8 April 1991

This transducer is for generating seismic shear waves in a borehole. The waves are generated by the lateral movement of a double headed piston 12,16, 18. A servo valve 36, 38 is connected to the opposite sides of a center

ii

piston head 14 to produce low-frequency vibration of the source generator. Eddy current transducers are placed between the piston heads to monitor the vibration and to provide feedback control to the servo valve.--SKC

5,027,393

43.88.Si VOICE CONFERENCE SYSTEM USING ECHO CANCELLERS

Yoshihiro Yamamura and Hitoshi Fuda, assignors to NEC Corporation

25 June 1991 (Class 379/410); filed in Japan 20 June 1988

The system consists of at least two microphones to send out voice signals to a remote location and a loudspeaker which receives voice signals

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from the remote location. To prevent the microphone from picking up the loudspeaker sound, each microphone is connected to the separate terminal of a comparator. A persons's voice in one microphone will pass but the loudspeaker sound being received equally by all microphones will be can- celed.•MDB

5,034,979

43.88.Si EARRING ADAPTER FOR TELEPHONE

Peggy J. Erickson, Kansas City, MO 23 July 1991 (Class 379/447); filed 14 April 1989

Application of the earphone of a telephone handset to the ear of a person wearing an earring can be a source of annoyance and discomfort. An attachment for handsets is described that limits the area of ear contact so as

to avoid pressure on the pinna where an earring may be worn.•MDB

5,146,619

43.88.Si EAR-SUPPORTED RADIO

Nancy Brown, Wilmington, DE 8 September 1992 (Class 455/351); filed 25 July 1990

The patent shows a radio receiver built into two housings resembling earphones. One unit contains the electronics and a small transducer that projects into the ear canal. The other unit contains the battery supply and also has a small transducer that projects into the ear canal. The units are supported by retention wires that go over the pinna. A flexible cord is pro- vided to connect the units.•SFL

5,159,640

43.88.Tj APPARATUS FOR CARRYING OUT HYPNOTHERAPIES

Claus Dick, Dahn, Germany 27 October 1992 (Class 381/77); filed in Switzerland 24 March 1987

This is a group therapy sound system in which all of the subjects wear earphones receiving control therapy sound signals "for initiating, deepen- ing and withdrawal from hypnosis stages." The therapy signals are pro-

I NTENSI FIER -4-

MOI•JI_ATIO N

LOUDSPEAKER

SOUND THRESHOLD GENERATOR CIRCUIT

duced in a sound reproduction stage from which the sound of the rushing of the sea can be added to group or individual suggestions superimposed upon the earphone signals.•DWM

1681 J. Acoust. Soc. Am., Vol. 93, No. 3, March 1993 Review of Acoustical Patents 1681

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