effect is said to be reduced by sensing the wind contribution with a micro- phone channel low-pass filtered at 250 Hz, and using this signal to switch the other microphone(s) on or off.--MDB

5,056,145

43.88.Md DIGITAL SOUND DATA STORING DEVICE

Takaharu Yamamoto et al., assignors to Kabushiki Kaisha Toshiba 8 October 1991 (Class 381/$1); filed in Japan 3 June 1987

This is a solid-state sound recorder using IC memory chips rather than magnetic tape as the recording medium. The patent describes the use of A/ D and D/A converters, an LCD display for various status readouts and

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some detail concerning the overall control logic. There is no mention of compression techniques. The claims concentrate on applications of the de- vice as an aid in learning a foreign language.--DLR

5,054,061

43.88.Si HANDS-FREE TELEPHONE

Ikio Yoshida, assignor to NEC Corporation 1 October 1991 (Class 379/390); filed in Japan 18 February 1988

In addition to the typical receive and transmit attenuation networks, controlled by a transmit signal detector and a receive signal detector, re- spectively, this telephone has an auxiliary control circuit that prevents the output of the transmit signal detector from reaching the attenuation control circuit during a transient period between a call origination and the begin- ning of conversation.--MDB

5,063,590

43.88.Si ACOUSTIC COUPLER AND DATA TRANSMISSION APPARATUS USING THE SAME

Takaho Koshiishi, assignor to Ricoh Company $ November 1991 (Class 379/99); filed in Japan 29 June 1989

Acoustic couplers have been used in the past for coupling data trans- mission devices to telephone handsets. The acoustic coupler described here contains a second set of microphone and receiver transducers permitting the user to communicate by voice also.•MDB

5,073,936

43.88.Vk STEREOPHONIC MICROPHONE SYSTEM

Rudolph Goricke et al., assignors to Rudolph Goricke 17 December 1991 {Class 381/26); filed in Austria 10 December 1987

"1. A stereophonic microphone system comprising stereophonic sound pickups, two replicas of human pinnae, a replica of an outer auditory meatus being connected to each pinna replica, a pressure microphone being mounted in each pinna... the microphones w•th pinna replicas being ar- ranged spaced apart and oriented as on the human head."--MDB

596 J. Acoust. Soc. Am., Vol. 93, No. 1, January 1993 Review of Acoustical Patents 596

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