Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 3 - Circuits for transducers
Patents for H04R 3 - Circuits for transducers (18,190)
11/1984
11/13/1984US4483015 Compensation network for loudspeakers
11/13/1984US4482866 Method of correcting for variations in a load driven by a power amplifier
11/07/1984EP0124250A1 Displacement generation device
11/06/1984US4481663 Network for use with piezoceramic transducer
11/06/1984US4481662 Method and apparatus for operating a loudspeaker below resonant frequency
11/06/1984US4481661 Effects box system and method
11/06/1984US4481660 Apparatus for driving one or more transducer units
10/1984
10/31/1984EP0123359A1 Electroacoustic transducer unit with reduced resonant frequency and mechanical spring with negative stiffness, preferably used in such a transducer unit
10/24/1984EP0122663A2 Method and system for improving speaker performance
10/24/1984EP0122290A1 Speaker
10/10/1984EP0120901A1 Signal reproduction apparatus
10/09/1984US4476348 In an acoustic data coupler
10/03/1984EP0120029A1 Noiseless connection and disconnection of audio effects modules
10/02/1984US4475233 Resistively damped loudspeaker system
10/02/1984US4475226 Stereo sound and light track system
09/1984
09/26/1984EP0119645A1 Automatic equalizing system with discrete Fourier transform (DFT) or fast Fourier transform (FFT)
09/25/1984US4473811 Single bobbin transformer having multiple delink windings and method of making same
09/18/1984US4472834 Loudspeaker system
09/04/1984US4469920 Piezoelectric film device for conversion between digital electric signals and analog acoustic signals
09/04/1984CA1173756A1 Headphone
08/1984
08/28/1984US4468806 Stero speaker mixer
08/14/1984US4466085 Tape reproducing apparatus combined with a radio set
08/08/1984EP0114828A1 Oto-laryngeal communication system
07/1984
07/31/1984CA1171795A1 Phase shift low frequency loudspeaker system
07/24/1984US4462112 Speaker system
07/24/1984US4461931 Frequency response equalizing network for an electrostatic loudspeaker
07/24/1984CA1171474A1 Arrangement for the transmission of audio signals
07/24/1984CA1171360A1 Mfb system with a by pass network
07/18/1984EP0113370A1 Environment-adaptive loudspeaker systems
07/17/1984US4460809 Process and device for converting a periodic LF electric voltage into sound waves
07/03/1984US4458362 Automatic time domain equalization of audio signals
07/03/1984CA1170337A1 System for controlling distinct devices in a theater
07/03/1984CA1170189A1 Microphone output transmission circuit
06/1984
06/27/1984EP0111773A1 Circuit for a piezoelectric tweeter
06/19/1984US4455675 Headphoning
06/19/1984CA1169359A1 Step-up circuit for driving full-range-element electrostatic loudspeakers
06/12/1984CA1168988A1 Loudspeaker system
06/05/1984US4453039 Arrangement for avoiding annoying sustained oscillations in a closed-loop system and loud-speaking telephone set employing this arrangement
05/1984
05/29/1984US4451710 Precisely stabilized piezoelectric receiver
05/15/1984US4449237 Audio feedback suppressor
05/09/1984EP0107777A1 Loudspeaker with motional feedback
04/1984
04/26/1984WO1984001682A1 Speaker
04/24/1984CA1166166A1 Teleconference microphone arrays
04/12/1984WO1984001479A1 Signal reproduction apparatus
04/10/1984US4442323 Microphone with vibration cancellation
04/03/1984US4441085 Signal amplifying apparatus
03/1984
03/29/1984WO1984001256A1 Noiseless connection and disconnection of audio effects modules
03/06/1984CA1163202A1 Loudspeaker or microphone arrangement having a direction - and frequency-independent behavior
02/1984
02/08/1984EP0099932A1 Speaker unit
02/07/1984US4430527 In an audio reproduction system
01/1984
01/31/1984US4429181 Audio system
01/24/1984US4427845 Dynamic microphone
01/19/1984WO1984000274A1 Environment-adaptive loudspeaker systems
01/17/1984US4426552 Speaker distortion compensator
01/17/1984CA1160730A1 Piezoelectric audible sound generator
01/03/1984US4424416 Acoustic reproducing apparatus
12/1983
12/28/1983EP0096778A2 Microphone
12/20/1983US4421949 Electroacoustic network
12/13/1983US4420655 Circuit to compensate for deficit of output characteristics of a microphone by output characteristics of associated other microphones
12/07/1983EP0095902A1 Headphone level protection circuit
12/06/1983CA1158173A1 Receiving system having pre-selected directional response
11/1983
11/29/1983CA1157953A1 De-esser
11/29/1983CA1157781A2 Method and system of controlling sound and effects devices by a film strip
11/23/1983EP0094762A2 Automatic time domain equalization of audio signals
11/22/1983CA1157383A1 Digitally controlled equalizer
11/08/1983US4414433 Microphone output transmission circuit
10/1983
10/27/1983WO1983003733A1 Oto-laryngeal communication system
10/25/1983US4412097 Variable-directivity microphone device
10/19/1983EP0091874A1 Method and device for wireless stereophonic transmission from a sound reproducing apparatus to loudspeakers
10/18/1983US4410063 Loudspeaker system
10/12/1983EP0091182A2 Acoustic transducers
10/04/1983US4408094 Output circuit
09/1983
09/27/1983US4406921 Apparatus for improving linearity of electromechanical transducers
09/27/1983US4406920 Monitor ampliphones
09/20/1983US4405832 Circuit for distorting an audio signal
09/13/1983US4404427 Audio signal processing system
09/13/1983CA1153702A1 Dynamic speaker equalizer
09/13/1983CA1153701A1 Audio signal processing system
09/06/1983US4403112 Phase shift low frequency loudspeaker system
08/1983
08/17/1983EP0085997A2 Acoustic transducer
08/16/1983US4399328 Direction and frequency independent column of electro-acoustic transducers
08/16/1983US4399327 Variable directional microphone system
08/04/1983WO1983002707A1 Speaker unit
08/03/1983EP0084982A2 Improvements in and relating to communications systems
08/02/1983US4396800 Microphone switching device
07/1983
07/27/1983EP0084402A1 Method and apparatus for operating a loudspeaker below resonant frequency
07/26/1983US4395739 Recording/reproducing apparatus with selective attenuation of reproduced signals to facilitate comprehension of external speech signals
07/26/1983US4395588 MFB system with a by-pass network
07/21/1983WO1983002536A1 Method and apparatus for operating a loudspeaker below resonant frequency
07/19/1983US4394656 Sound display apparatus having separation control
07/19/1983CA1150391A1 Oscillation generator for an ultrasonic liquid atomizer
07/12/1983US4393353 Negative feedback amplifying circuit having voltage negative feedback and current negative feedback circuits
06/1983
06/14/1983US4388490 Effects box system and method
06/14/1983CA1148091A2 Speaker crossover networks
06/14/1983CA1148090A1 Speaker crossover networks
06/08/1983EP0080771A1 Apparatus for driving one or more transducer units
06/07/1983US4387352 Transducer array crossover network
06/07/1983US4387270 Method of harmonizing the impedances of an audio amplifier and loudspeaker interconnected therewith
05/1983
05/31/1983US4385814 System for controlling distinct devices in a theater
05/31/1983CA1147448A1 Audio-band electromechanical vibration converter
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