Patents
Sitemap › H04 - Electric communication technique › H04S - Stereophonic systems › H04S 1 - Two-channel systems
Patents for H04S 1 - Two-channel systems (4,182)
12/1991
12/26/1991WO1991020163A1 Method for controlling the width and distance of an acoustical image
12/17/1991US5073936 Stereophonic microphone system
12/16/1991WO1991020167A1 Method and apparatus for creating de-correlated audio output signals and audio recordings made thereby
12/16/1991CA2085480A1 Method and apparatus for creating de-correlated audio output signals and audio recordings made thereby
11/1991
11/27/1991EP0458575A1 Stereo microphone unit
11/26/1991US5068897 Mobile acoustic reproducing apparatus
11/12/1991US5065432 Sound effect system
10/1991
10/23/1991EP0453293A2 Sound field variable apparatus
10/20/1991CA2015087A1 Audio selection testing and advertising device
09/1991
09/19/1991DE4007841A1 Audio signal processing for stereo headphone - adjusting stereo spectrum width or original audio signal and feeding back variable intensity
09/03/1991US5046097 Sound imaging process
08/1991
08/22/1991WO1991012699A1 Circuit arrangement for modifying the output signals of a multi-channel electro-acoustic device
08/21/1991EP0442388A1 Circuit arrangement for modifying the output signal of a multi-channel acoustical apparatus
08/20/1991US5042068 Audio spatial equalization system
08/13/1991US5040219 Sound reproducing apparatus
07/1991
07/25/1991DE4102078A1 Reverberation effect audio device - generates audio signals with coeffts. of level attenuation depending on registered loudness of basic signal
07/24/1991EP0438281A2 Acoustic signal reproducing apparatus
07/23/1991US5034983 Head diffraction compensated stereo system
07/23/1991US5033577 Room sound reproducing
07/20/1991WO1991011080A1 Apparatus for reproducing acoustic signals
07/20/1991WO1991011079A1 Apparatus for reproducing acoustic signals
07/16/1991US5033092 Stereophonic reproduction system
07/16/1991US5033086 Stereophonic binaural recording or reproduction method
07/03/1991EP0434691A1 Improvements in or relating to sound reproduction systems.
07/02/1991US5027687 Basic audio signal
06/1991
06/08/1991CA2031665A1 Sound imaging apparatus for a video game system
05/1991
05/21/1991CA1284297C Stereo enhancement system
05/16/1991DE4025973A1 Sound field corrector with sound effect generator(s) - has switches for generator left and right channel changeover
04/1991
04/18/1991DE4014394A1 Preventing faulty operation of audio changeover switch - uses decision step for testing stereo or mono mode of received signal
04/17/1991EP0422955A2 Sound field control system
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
02/1991
02/13/1991EP0412725A2 Sound reproduction apparatus
02/07/1991WO1991001616A2 System for the 'in front' location of auditory events generated by stereo headphones
01/1991
01/29/1991CA1279581C Automatic dynamic equalizing
01/23/1991EP0409360A2 Sound output system
01/17/1991DE3922118A1 Direction variable ear adapting for stereo audio transmission - involves outer ear transmission function tuning for binaural adapting
01/09/1991EP0349599B1 Paradoxical hearing aid
12/1990
12/25/1990US4980914 Sound field correction system
12/16/1990WO1990016136A1 Polyphonic coding
12/05/1990EP0400106A1 Stereo enhancement and directivity servo.
12/04/1990US4975954 Head diffraction compensated stereo system with optimal equalization
12/04/1990US4975953 Combined deemphasis circuit and noise blanker
10/1990
10/24/1990CN1046433A Acoustic matrix-type audio equipment
10/09/1990CA1275054A1 Stereo reproduction system
10/04/1990WO1990011670A1 Stereo synthesizer
10/03/1990EP0207084B1 Spatial reverberation
09/1990
09/26/1990EP0388919A2 Matrix circuit of FM stereo multiplex demodulation circuit
08/1990
08/29/1990CN1045010A Apparatus and method thereof for improvement of stereophonic sound
08/28/1990US4953219 Stereo signal reproducing system using reverb unit
08/28/1990US4953212 Auto voice changing apparatus
08/23/1990WO1990009728A1 Signal enhancement processor for stereo system
08/22/1990EP0383535A2 Apparatus for improvement of stereophonic sound
07/1990
07/18/1990EP0377965A2 Combined deemphasis circuit and noise blanker
07/04/1990EP0376553A2 Perceptual coding of audio signals
06/1990
06/13/1990EP0372830A2 Room sound reproducing
06/06/1990CA2004581A1 Room sound reproducing
05/1990
05/17/1990WO1990005438A1 Stereo enhancement and directivity servo
05/09/1990EP0367569A2 Sound effect system
05/01/1990CA1268546A1 Stereophonic voice signal transmission system
04/1990
04/26/1990DE3934672A1 Elektroakustisches verfahren zur darbietung von audiosignalen fuer das richtungsorientierte raeumliche hoeren Electro-acoustic method for presenting audio signals for the direction-oriented spatial hear
04/19/1990WO1990004288A1 Relative time delay correction system utilizing window of zero correction
03/1990
03/20/1990US4910779 Head diffraction compensated stereo system with optimal equalization
03/20/1990US4910778 Signal enhancement processor for stereo system
03/13/1990US4908858 Stereo processing system
03/07/1990EP0357402A2 Sound imaging method and apparatus
03/07/1990EP0357034A2 Audio signal processing system performing balance control in both amplitude and phase of audio signal
03/07/1990EP0356995A2 Apparatus for supplying control codes to sound field reproduction apparatus
03/07/1990EP0356871A2 Loudspeaker arrangement for a HDTV receiver
01/1990
01/25/1990WO1990000851A1 Improvements in or relating to sound reproduction systems
01/10/1990EP0349599A1 Paradoxical hearing aid.
01/09/1990US4893342 Head diffraction compensated stereo system
12/1989
12/27/1989CN1038387A Multidimensional stereophonic sound reproduction system
12/26/1989US4890065 Relative time delay correction system utilizing window of zero correction
12/19/1989US4888809 Method of and arrangement for adjusting the transfer characteristic to two listening position in a space
12/14/1989WO1989012373A1 Multidimensional stereophonic sound reproduction system
10/1989
10/05/1989WO1989009465A1 Electro-acoustical system
10/04/1989EP0335468A1 Electro-acoustical system
09/1989
09/19/1989US4868878 Sound field correction system
09/12/1989US4866774 Stero enhancement and directivity servo
08/1989
08/23/1989EP0329201A2 Mobile sound field correcting device
08/08/1989US4856064 Sound field control apparatus
08/02/1989EP0325650A1 Extended imaging split mode loudspeaker system
07/1989
07/11/1989US4847904 Ambient imaging loudspeaker system
06/1989
06/22/1989DE3840766A1 Stereophonic recording device for improving the three-dimensional hearing
06/20/1989US4841572 Stereo synthesizer
06/14/1989EP0320270A2 Stereophonic sound output system with controlled directivity
06/06/1989US4837824 Stereophonic image widening circuit
05/1989
05/24/1989DE3737873A1 Method and device for improving the intelligibility of voice in communications devices
05/16/1989US4831652 Stereo expansion circuit selection switch
04/1989
04/20/1989WO1989003632A1 Head diffraction compensated stereo system
04/04/1989US4819269 Extended imaging split mode loudspeaker system
03/1989
03/28/1989US4817162 Binaural correlation coefficient correcting apparatus
03/28/1989US4817149 Three-dimensional auditory display apparatus and method utilizing enhanced bionic emulation of human binaural sound localization
03/28/1989CA1251740A1 Soundstage boundary expansion system
03/22/1989EP0308009A1 Method of and arrangement for adjusting the transfer characteristic to two listening positions in a space
03/21/1989US4815133 Sound field producing apparatus
03/21/1989US4815132 Stereophonic voice signal transmission system
03/21/1989US4815131 Digital audio channel selection circuit
03/14/1989US4812921 Sound field expansion system for a video tape recorder
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