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)
05/1983
05/17/1983CA1146664A1 Piezoelectric transducer drive having temperature compensation
05/17/1983CA1146662A1 Circuit for processing the signals received by a mosaic of ultrasonic transducers in b-mode echography
05/10/1983US4383134 Loudspeaker systems
05/10/1983US4382398 Method and apparatus for eliminating feedback in stage monitors
05/03/1983US4382159 Blow actuated microphone
04/1983
04/12/1983US4379951 Electro-acoustic transducer means
04/06/1983EP0075615A1 Sound field simulation system and method for calibrating same
04/05/1983US4379209 Audio amplifier
03/1983
03/29/1983US4378468 Methods and apparatus for alleviating sound-coupled feedback in conference room sound systems
03/16/1983EP0074137A1 Apparatus for electroacoustic energy conversion
03/08/1983US4376255 Method for pulse triggering of a piezo-electric sound-transmitting transducer
03/01/1983US4375623 Arrangement for the transmission of audio signals
02/1983
02/16/1983EP0071772A1 Method and circuit for transient response, especially of a loudspeaker
02/09/1983EP0057215A4 Improved step-up circuit for driving full-range-element electrostatic loudspeakers.
02/08/1983CA1140862A1 High fidelity speaker system
02/01/1983US4371750 Microphone and remote control system
02/01/1983CA1140476A1 Recording/reproducing apparatus with selective attenuation of reproduced signals to facilitate comprehension of external speech signals
01/1983
01/18/1983US4369412 Audio amplifier
12/1982
12/14/1982US4363934 Volume control device
12/01/1982EP0065911A1 Ionic electro-acoustic transducer
12/01/1982EP0065810A2 Travelling wave electrical/acoustic transducer system and a microphone and loudspeaker incorporating such a system
12/01/1982EP0065746A2 Condenser microphone
11/1982
11/30/1982US4361736 Pressure recording process and device
11/30/1982US4361735 Electret microphone circuit
11/30/1982CA1136554A1 Overlay-coil speaker with direct coupling
11/24/1982EP0065335A1 Device for avoiding sustained disturbing oscillations in a closed-loop system and loud-speaking telephone apparatus utilising this device
11/16/1982US4359602 Multiple input audio program system
11/02/1982US4357492 Automatic microphone mixing apparatus
10/1982
10/12/1982US4354067 Audio-band electromechanical vibration converter
10/12/1982US4354059 Variable-directivity microphone device
10/12/1982CA1133595A1 Amplifier load correction system
10/06/1982EP0061812A1 Disposition of acoustic transducers and use of this disposition in a hands-free telephone apparatus
10/05/1982US4353123 Ultrasonic transmitter
10/05/1982US4353004 Circuit for alternate transmission and reception with only one sound source transducer
10/05/1982CA1132913A1 Public address system
09/1982
09/07/1982CA1131315A1 Infrared radiation communication system
08/1982
08/11/1982EP0057215A1 Improved step-up circuit for driving full-range-element electrostatic loudspeakers
08/10/1982CA1129490A1 Circuit for generating a control voltage depending upon the amplitude of an alternating voltage
08/03/1982CA1128872A1 Volume control apparatus
07/1982
07/20/1982US4340915 Microphone sensitivity-changing apparatus
07/20/1982US4340778 Speaker distortion compensator
06/1982
06/29/1982US4337383 Earphone jack for tape recorders
06/22/1982US4336509 Oscillation generator for an ultrasonic liquid atomizer
06/22/1982CA1126170A1 Circuit for imposing a d.c. level on an a.c. signal
06/15/1982US4335274 Sound reproduction system
06/15/1982US4334740 Receiving system having pre-selected directional response
06/01/1982US4332979 Electronic environmental acoustic simulator
05/1982
05/18/1982US4330691 Integral ceiling tile-loudspeaker system
05/18/1982US4330686 Loudspeaker systems
05/04/1982US4328573 Precision phonocartridge interface
04/1982
04/27/1982US4327250 Dynamic speaker equalizer
04/21/1982EP0050067A1 Audio system
04/13/1982US4324142 Circuit for processing the signals received by a mosaic of ultrasonic transducers in B-mode echography
04/06/1982US4323736 Step-up circuit for driving full-range-element electrostatic loudspeakers
03/1982
03/30/1982CA1120864A2 Central control system
03/30/1982CA1120863A2 Central control system for dictation system with apparatus for recording data on a record medium
03/30/1982CA1120862A2 Central control system with external data entry
03/24/1982EP0048116A1 Moving coil loudspeaker
03/23/1982CA1120580A1 Single loudspeaker having a moving coil transducer for feedback purposes
03/17/1982EP0047281A1 Automatic corrector for the frequency transmission characteristics of an electro acoustic channel
02/1982
02/24/1982EP0046388A1 Multi-way loudspeaker system
02/24/1982EP0046266A2 Method and circuit arrangement for dividing an electrical audiofrequency signal in N channels limited in bandwidth
02/18/1982WO1982000559A1 Improved step-up circuit for driving full-range-element electrostatic loudspeakers
02/16/1982US4316060 Equalizing system
02/09/1982US4315102 Speaker cross-over networks
02/02/1982US4314174 Piezoelectric transducer drive having temperature compensation
02/02/1982CA1117434A2 Programmed conversation recording system
01/1982
01/26/1982US4313090 Car-mounted audio equipment
01/19/1982US4311874 Teleconference microphone arrays
01/19/1982US4311872 Portable voice communication system
12/1981
12/29/1981US4308425 Variable-directivity microphone device
12/29/1981CA1115438A1 Audio teleconferencing
12/15/1981US4306113 Method and equalization of home audio systems
12/09/1981EP0041472A1 Circuit arrangement having an amplifier with output coupling transformer
12/01/1981US4303836 Audio silencer for radio and T-V sets
11/1981
11/17/1981US4301330 Loudspeaker protection circuit
11/11/1981EP0039343A1 Crossover circuit
11/03/1981CA1111775A2 Loudspeaker system with improved lc crossover network
10/1981
10/20/1981US4296444 Inductive signal transducer supply circuit particularly for video recording use
10/20/1981US4296278 Loudspeaker overload protection circuit
10/13/1981US4295006 Speaker system
10/06/1981CA1110176A1 Woofer efficiency
09/1981
09/30/1981EP0036831A1 Loudspeaker enclosure
09/23/1981EP0036230A1 MFB system with a by-pass network
09/23/1981EP0036186A2 Method for pulse activation of a piezo-electric sound transmitter-transducer
09/22/1981US4291276 Equalizer amplifier
09/17/1981WO1981002658A1 Automatic corrector for the frequency transmission characteristics of an electro acoustic channel
09/08/1981US4288755 Protective circuit for a direct-coupled amplifier
09/08/1981CA1108541A1 Priority mixer control
09/03/1981WO1981002501A1 Magnetic circuit for an electro-mechanical transducer of a dynamic electricity-type
09/02/1981EP0034865A2 Arrangement for the transmission of audio signals
09/02/1981EP0034844A1 A direction- and frequency-independent loudspeaker- or microphone-column or a loudspeaker- or microphone-surface
09/01/1981US4287389 High-fidelity speaker system
08/1981
08/26/1981EP0034322A2 Ultrasonic transmitter
08/19/1981EP0033769A2 Headphones demonstration system
08/12/1981EP0033508A1 Circuit for intermittently transmitting and receiving with only one sound transmitter-transducer
08/04/1981US4282402 Design of crossover network for high fidelity speaker system
07/1981
07/28/1981US4281314 Selection switching apparatus
07/28/1981US4281221 Condenser microphone
06/1981
06/30/1981US4276443 Sound reproducing system utilizing motional feedback and velocity-frequency equalization
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