4,276,802

43.75.Tv ELECTRONIC KEYBOARD INSTRUMENT

Fumio Mieda, assignor to Keio Giken Kogyo Kubushiki Kalsha 7 July 1981 (Class 84/1.29); filed in Japan 3 April 1978

This electronic keyboard instrument produces tone signals of differ- ent spectral content through the switching of one or more fixed filters 4a- d or through variable gain control of the outputs of bandpass filters 15a-n, or a combination of both. Both sets of filters receive input through key- board switches 3 from a combination of complex tone signals of appropri- ate frequency from signal source 2 and the output of noise source 21. The

(.1 Electronic Keybocmd Instrument 3 Key Switch Group ,5 Tone Switch Group

' : ' I

,19

16o RECT

i•10 cøntrøl Meons

9 Frequency 5peetrum

guitar strings and fret board to accurately detect string depression, slide or hammer movements, open/closed string status, and muting of strings, controlling the synthesizer in accordance with these parameters.mDWM

4,289,307

43.80.Lb RIDING TOY WITH SOUND EFFECTS

Trevor J. Marshall, Jr., and Darryl R. Dworkin, assignors to CBS Incorporated

15 September 1981 (Class 272/52.5); filed 9 February 1979

"A model horse is resilienfiy mounted to permit a child rider to cause motion of the horse having vertical and/or horizontal motion compon- ents. A trotting gait sound is generated in response to detected vertical motion, and a walk and/or gallop gait sound is generated in response to detected horizontal motion. The selection as between the walk and gallop gait is preferably based upon the amplitude or horizontal motion. The different gait sounds are obtained by generating a basic 'clop' (hoofbeat) sound, and, repeating the clop sound in a different time sequence for each gait. In the preferred embodiment of the invention, the sounds of a horse's 'snort' and 'whinny' are also generated during riding. The sounds pro- duced in accordance with the invention are obtained by digitally forming audio frequency signals and controlling the envelope of the audio frequen- cy signals."mDWM ,

11 MIKE

8 Externol Input Terminal

L-•BP !

13n ' 1/,n / . 7'

:L? H RECT I

variable gain for each of the bandpass filters 15a-n depends upon the rectified output of bandpass filters 13a-n receiving amplified pickup by microphone 11 of an external sound source such as a human singing voice or an orchestral instrument. The intent is to make the electronic instru-

ment output resemble in spectral content the spectrum of the external sound source which it accompanies. Additional control is provided by supplying mixed rectifier signals from mixer 18 to modulate signal source 2 through RC filter 19-20.--DWM

4,282,452

43.80.Vj METHOD AND CIRCUIT ARRANGEMENT FOR ENERGIZING ULTRASONIC TRANSDUCERS WHICH ARE UTILIZED IN IMPULSE ECHO TECHNO- LOGY

Dieter Hassler and Robert Schwarz, assignors to Siemens Ak- tiengesellschaft

4 August 1981 (Class 310/317); filed in Germany 30 March 1978

Circuits are described that limit the duration of the ultrasonic pulses emitted by an echo-location apparatus for medical diagnosis. The trans- mitter generates electric power continuously at the operating frequency, and is connected to the transducer momentarily by electronic switches. Full power is supplied to the transducer for just two periods of the ac wave. Then, to quench the natural ringing of the transducer, reduced power is applied for one period in the opposite phase.--LB

4,321,852

43.75.Tv STRINGED INSTRUMENT SYNTHESIZER APPARATUS

Leroy D. Young, Jr., Miami, Florida 33165 30 March 1982 (Class 84/1.16); filed 19 December 1979

This apparatus is intended to provide a guitarist with electronic con- trol over a synthesizer without changing the manner in which the guitar is played. The guitar is provided with a fret-bearing surface designed to provide accurate generation of volume, gate, and frequency control sig- nals for the synthesizer. A microprocessor is used in combination with the

4,314,769

43.88.- p ACOUSTICAL TONE GENERATOR Edmund H. James, III, assignor to International Business Ma-

chines Corporation 9 February 1982 (Class 400/144.2); filed 2 June 1980

This patent describes a sophisticated means for generating a tone substitute for the conventional bell signal of a typewriter through the use of mechanical parts already present in the typewriter system. When the event occurs which requires the attention of the typist a microprocessor is used to detect and identify the event and to generate an audio signal which

306 J. ̂ coust. Soc. Am. 72(1), July 1982' 0001-4966/82/070306-02500.80 ß ¸ 1982 ̂ coust. Soc. Am.; Patent Reviews 306

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