Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 5 - Stereophonic arrangements
Patents for H04R 5 - Stereophonic arrangements (11,598)
04/1991
04/04/1991WO1991001544A3 Vehicular sound reproducing
04/02/1991US5005201 Apparatus and method thereof for improvement of stereophonic sound
03/1991
03/21/1991WO1991001616A3 System for the 'in front' location of auditory events generated by stereo headphones
03/20/1991CN1050119A Sound imaging method and apparatus
03/19/1991US5001774 Stereo headphone remote control circuit
03/06/1991EP0415779A2 Multi-channel audio system
03/01/1991CA2023838A1 Enhancing bass
02/1991
02/19/1991CA1280376C Stereophonic soundbox
02/12/1991US4993074 Adjustable
02/12/1991US4991688 Audio speaker system
02/07/1991WO1991001616A2 System for the 'in front' location of auditory events generated by stereo headphones
02/07/1991WO1991001544A2 Vehicular sound reproducing
02/06/1991EP0411786A1 Vehicular sound reproducing
02/05/1991US4991222 Sound reproducer
01/1991
01/30/1991EP0410352A2 Loudspeaker system
01/23/1991EP0409360A2 Sound output system
01/18/1991CA2021243A1 Vehicular sound reproducing
01/17/1991DE3922118A1 Direction variable ear adapting for stereo audio transmission - involves outer ear transmission function tuning for binaural adapting
01/15/1991US4984653 Loudspeaker arrangement
01/08/1991US4984273 Enhancing bass
01/02/1991CN1048297A Voice frequency amplifier capable of regulating hearing distance
11/1990
11/27/1990US4972533 Combination comforter and sleeping bag
11/22/1990EP0398595A2 Image derived directional microphones
10/1990
10/24/1990CN1046433A Acoustic matrix-type audio equipment
10/23/1990US4965775 Image derived directional microphones
10/18/1990DE3912582A1 Objective evaluation of headphone quality - employs graphs and experience guide data to determine ability to reproduce 3 dimensional sound without subjective factor
10/09/1990CA1275054A1 Stereo reproduction system
10/02/1990US4961226 Stereo electroacoustical transducing
09/1990
09/26/1990EP0389174A1 Wireless headphones
09/20/1990DE3904943A1 Loudspeaker arrangement for improving the acoustic sound impression in living rooms
09/19/1990EP0387516A2 Combination of a car radio and other communication means
09/12/1990EP0386846A1 Electro-acoustic system
08/1990
08/29/1990EP0334843B1 Loudspeaker installation
08/29/1990CN1045010A Apparatus and method thereof for improvement of stereophonic sound
08/28/1990US4953213 Surround mode stereophonic reproducing equipment
08/28/1990US4952024 Three-dimensional sight and sound reproduction apparatus for individual use
08/22/1990EP0383535A2 Apparatus for improvement of stereophonic sound
08/09/1990DE3903246A1 Detection and reduction of defects in sound irradiation in headphones
08/07/1990US4947437 Stereo microphone
07/1990
07/26/1990DE3932984A1 Stereophonic audio signal reproduction system - has front and rear speakers operated in different modes by selectors
07/26/1990DE3902062A1 Loudspeaker unit with a reflector
07/17/1990US4942617 Earphone cord take-up device
07/12/1990WO1990007824A1 Electronic audio signal amplifier and loudspeaker system
07/03/1990US4939781 Device for eliminating absolute polarity inversion in a high-fidelity sound reproduction system
06/1990
06/28/1990WO1990007252A1 Stereo sound system
06/13/1990EP0372830A2 Room sound reproducing
06/12/1990US4933921 Signal reproducing apparatus
06/06/1990CA2004581A1 Room sound reproducing
06/05/1990US4932060 Stereo electroacoustical transducing
05/1990
05/30/1990EP0370619A2 Multiple loudspeaker sound system for a video display device
05/17/1990WO1990005434A1 Loudspeaker arrangement
05/09/1990CN1042036A Speaker assembly
05/02/1990CN2056798U 组合式立体声耳机插塞 Combined stereo headphone plug
04/1990
04/18/1990EP0363376A1 Procedure and device for facilitating audiovisual observation of a distant object
04/03/1990US4914707 Balanced vehicular speaker system
03/1990
03/21/1990EP0359191A2 Apex loudspeaker
03/13/1990US4908868 Phase polarity test instrument and method
03/07/1990EP0357402A2 Sound imaging method and apparatus
03/07/1990EP0356871A2 Loudspeaker arrangement for a HDTV receiver
12/1989
12/27/1989CN1038387A Multidimensional stereophonic sound reproduction system
12/27/1989CN1038386A Loudspeaker arrangement
12/19/1989US4888805 Stereo head headphones bracket system
12/19/1989US4888804 Sound reproduction system
12/14/1989WO1989012373A1 Multidimensional stereophonic sound reproduction system
12/14/1989DE3818931A1 Loudspeaker box
12/07/1989DE3819217A1 Loudspeaker system
11/1989
11/21/1989US4882753 Passive ambience recovery system for the reproduction of sound
11/14/1989US4881265 Apex loudspeaker
11/01/1989CN2047086U Frequency modulation stereo radio microphone
10/1989
10/31/1989US4877105 Rear speaker unit for a motor vehicle
10/24/1989US4876724 Personal sound system
10/24/1989US4875546 Loudspeaker with acoustic band-pass filter
10/18/1989CN2046302U Four acoustic box recorder
10/18/1989CN1036493A Stereo cassette type speaker system
10/04/1989EP0334843A1 Loudspeaker installation.
09/1989
09/27/1989CN2045168U Ok universal earphones
09/26/1989US4870630 Desk with removable program playing device
09/26/1989CA1261462A1 Audio-frequency electromechanical vibrator
09/19/1989US4868888 Audio communications module for an office chair
09/12/1989US4866776 Audio speaker system for automotive vehicle
09/06/1989CN1035406A Sound device composed of structure-symmetrized power amplifier and speaker
08/1989
08/29/1989US4862438 Pillow/audio system combination
08/22/1989US4860363 Loudspeaker system
08/02/1989EP0325650A1 Extended imaging split mode loudspeaker system
07/1989
07/26/1989EP0325175A2 Multi-channel stereophonic system
07/11/1989US4847904 Ambient imaging loudspeaker system
07/04/1989US4845775 Loudspeaker reproduction apparatus in vehicle
07/04/1989US4845751 Wireless stereo headphone
06/1989
06/22/1989DE3840766A1 Stereophonic recording device for improving the three-dimensional hearing
06/20/1989CA1256036A1 Microphone actuation control system suitable for teleconference systems
06/14/1989EP0320270A2 Stereophonic sound output system with controlled directivity
06/06/1989US4837826 Stereophonic baffle
06/06/1989US4837825 Passive ambience recovery system for the reproduction of sound
06/06/1989US4836326 Optimal shadow omniphonic microphone and loudspeaker system
06/01/1989DE3810028C1 Stereo reproduction arrangement
05/1989
05/24/1989DE3737873A1 Method and device for improving the intelligibility of voice in communications devices
05/16/1989US4831656 Conference microphone for use with hearing impaired amplification system
05/09/1989US4829571 Headphone
05/09/1989US4829500 Portable wireless sound reproduction system
05/03/1989CN2037131U Pocket integrated stereophonic sound box
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