| Patents for H04R 3 - Circuits for transducers (18,190) |
|---|
| 06/29/1993 | US5224169 Protection arrangement for an audio output channel |
| 06/16/1993 | EP0546619A2 Low frequency audio doubling and mixing circuit |
| 06/16/1993 | EP0546571A1 Amplifier circuit for electret condenser microphone |
| 06/09/1993 | EP0545731A1 Noise reducing microphone apparatus |
| 06/09/1993 | CN2135888Y Earphone volume safety device |
| 06/08/1993 | US5218642 Feedback noise-eliminating microphone circuit |
| 06/08/1993 | US5218641 Wireless receiver |
| 06/02/1993 | EP0544389A1 Wireless microphone device |
| 06/02/1993 | EP0544232A2 Sound collecting system and sound reproducing system |
| 06/01/1993 | US5216723 Permanent magnet transducing |
| 06/01/1993 | US5216596 Telepathology diagnostic network |
| 05/27/1993 | WO1993010646A1 Method and device for dynamic equalization |
| 05/27/1993 | WO1993010613A1 A circuit for use with microphones |
| 05/27/1993 | CA2123396A1 Process and device for dynamic equalization |
| 05/26/1993 | EP0543224A2 Speaker driving device |
| 05/25/1993 | US5214707 Control system for controlling equipment provided inside a vehicle utilizing a speech recognition apparatus |
| 05/21/1993 | WO1992010918A1 Signal processor for recreating original audio signals |
| 05/19/1993 | EP0542345A2 Active sound reproducer and control unit for controlling an active sound reproducer |
| 05/19/1993 | EP0541962A2 Visual indicator for hearing protection in an audio amplifier |
| 05/18/1993 | US5212732 Effects speaker system |
| 05/11/1993 | US5210806 Digital audio signal processing apparatus |
| 05/11/1993 | US5210802 Acoustic imaging |
| 05/04/1993 | US5208864 Method of detecting acoustic signal |
| 05/04/1993 | US5208786 Multi-channel signal separation |
| 04/29/1993 | DE4134578A1 Circuitry for superimposing sound effect waves on audio signals - has linear and nonlinear circuits with common input and having outputs added to give audio output |
| 04/28/1993 | CN1020389C Series magnetic circuit and electric circuit system of electroacoustic transducer |
| 04/27/1993 | US5206912 Power amplifier adapter |
| 04/15/1993 | WO1993007730A1 Process and system for sound pick-up, apparatus for sound pick-up and reproduction |
| 04/08/1993 | DE4129793A1 Trinary signal control for loudspeaker unit - uses bridge circuit to supply loudspeaker with three different signal conditions |
| 04/07/1993 | CN1070782A Apparatus for virtual expansion of power supply capacity |
| 04/06/1993 | US5200708 Apparatus for the virtual expansion of power supply capacity |
| 04/01/1993 | DE4210707C1 Automatic volume control for loudspeaker system - driving loudspeaker with signal calculated by multiplying input signal with quotient of time-averaged rectified voltage derived from radiated signal and detected noise |
| 03/23/1993 | US5197104 Electrodynamic loudspeaker with electromagnetic impedance sensor coil |
| 03/23/1993 | US5197102 Audio power amplifier system with frequency selective damping factor controls |
| 03/18/1993 | WO1993005503A1 Multi-channel signal separation |
| 03/17/1993 | EP0520067A4 Improved audio distribution system |
| 03/17/1993 | CN2128443Y Compound graphical balancer |
| 03/09/1993 | US5193117 Microphone apparatus |
| 03/03/1993 | EP0529158A1 Controlling sound dosage |
| 03/02/1993 | US5191619 Bass enhancing device for a speaker system |
| 03/02/1993 | US5191616 Acoustic apparatus |
| 02/24/1993 | EP0528475A1 Method and apparatus for adjusting tone in a sound system |
| 02/24/1993 | EP0528404A2 Audio signal reproducing device |
| 02/24/1993 | EP0249640B1 Multi-channel stereo reproducing apparatus |
| 02/23/1993 | US5189705 Audio equipment |
| 02/17/1993 | EP0527591A2 Infrared cordless microphone |
| 02/17/1993 | EP0527556A1 Adjustable filter for differential microphones |
| 02/16/1993 | US5187692 Acoustic transfer function simulating method and simulator using the same |
| 02/11/1993 | DE4209525C1 Restoring output signal of diaphragm hydrophone - removing artifacts by subtracting correction signal derived from output signal |
| 02/10/1993 | EP0526880A2 Audio surround system with stereo enhancement and directivity servos |
| 02/09/1993 | US5185805 Tuned deconvolution digital filter for elimination of loudspeaker output blurring |
| 02/09/1993 | US5185801 Correction circuit and method for improving the transient behavior of a two-way loudspeaker system |
| 02/03/1993 | EP0525777A1 Speaker driving circuit |
| 02/02/1993 | US5184331 Transducer circuit for removing reactive component of transducer signal |
| 01/28/1993 | DE4224338A1 Compensating sound signals according to auditorium conditions - varying high frequency range according to results of tests on room before playback |
| 01/27/1993 | CN1068467A Personal earphone for language study |
| 01/21/1993 | DE4218166A1 Automatische lautstaerkesteuervorrichtung Automatic lautstaerkesteuervorrichtung |
| 01/19/1993 | US5181252 High compliance headphone driving |
| 01/19/1993 | US5181251 Amplifier unit |
| 01/12/1993 | US5177872 Method and apparatus for monitoring physical positioning of a user |
| 12/30/1992 | EP0520385A2 Arrangement of loudspeakers |
| 12/30/1992 | EP0520067A1 Improved audio distribution system. |
| 12/24/1992 | DE4129501C1 Audio crossover for loudspeaker system - has series resonant circuit formed by addition of inductor coil in HF circuit, and capacitor and resistor placed in parallel with bass drive unit |
| 12/22/1992 | US5173943 Compact subwoofer with exceptional low frequency response |
| 12/22/1992 | US5173575 Acoustic apparatus |
| 12/16/1992 | EP0321455B1 Emulated guitar loudspeaker |
| 12/15/1992 | US5172417 Apparatus for controlling acoustical transfer characteristics |
| 12/10/1992 | WO1992022132A1 Audio signal cable |
| 12/09/1992 | CN2124534U Contrast earphone for learning pronounce |
| 12/08/1992 | US5170436 Acoustic speaker system |
| 12/08/1992 | US5170435 Waveguide electroacoustical transducing |
| 12/08/1992 | CA1311293C Elastic impulsion generator having the desired predetermined wave shape and its application to medical treatment and diagnosis |
| 12/03/1992 | DE4117607A1 Loudspeaker unit with digitally controlled transfer function - has individual loudspeakers incorporated in walls of common driver chamber, radiating to common point, with sound emitted through aperture in chamber |
| 12/02/1992 | EP0516220A2 Electroacoustic amplifier arrangement and microphone arrangement to be used in the electroacoustic amplifier arrangement |
| 12/02/1992 | EP0515853A1 Protection arrangement for an audio output channel |
| 12/02/1992 | CN1066755A Protection arrangement for audio output channel |
| 11/17/1992 | US5164984 Hands-free telephone assembly |
| 11/16/1992 | CA2063667A1 Mobile radio audio system |
| 11/11/1992 | EP0512365A1 Apparatus for aurally compensated volume regulation |
| 11/04/1992 | EP0327617B1 Improvements relating to noise reduction systems |
| 11/03/1992 | US5161198 Mobile radio audio system |
| 10/27/1992 | US5159641 Microphone circuit control mechanism for breathing apparatus |
| 10/21/1992 | EP0509742A2 Microphone apparatus |
| 10/21/1992 | EP0509048A1 Correction circuit and method for a two-way loudspeaker system |
| 10/15/1992 | WO1992017920A1 Minimum wire interface for multiple accessories |
| 10/15/1992 | DE4111276A1 Combining recursive and non-recursive digital filters for compensation of electroacoustic transducers - shifting resonant frequency by recursive filter and using combined effect to improve linear characteristic in LF range |
| 10/14/1992 | EP0508570A2 Permanent magnet transducer |
| 10/14/1992 | EP0508392A2 Circuit arrangement for correcting linear and non-linear transfer characteristics of electroacustic transducers |
| 10/07/1992 | CN2118377U Motion feedback active sound box |
| 10/06/1992 | US5153915 Speaker filtering circuit and support therefor |
| 10/06/1992 | US5153914 Sound equipment system |
| 10/06/1992 | CA1308485C Automated stereo synthesizer for audiovisual programs |
| 09/30/1992 | EP0506280A2 Device for noise attenuation of weaving machine |
| 09/30/1992 | EP0505949A1 Acoustic transfer function simulating method and simulator using the same |
| 09/29/1992 | US5151680 Speaker driver |
| 09/15/1992 | US5148491 Automatic mixer apparatus |
| 09/15/1992 | US5148384 Signal processing integrated circuit |
| 09/12/1992 | CA2061444A1 Permanent magnet transducer |
| 09/02/1992 | EP0500767A1 Audio surveillance discouragement apparatus and method |
| 09/01/1992 | US5144114 Volume control apparatus |