| Patents for H04S 5 - Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation (2,758) |
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| 01/18/1983 | US4369335 Two-channel, four loudspeaker-component enhanced sterophonic system |
| 11/16/1982 | US4359605 Monaural signal to artificial stereo signals convertings and processing circuit for headphones |
| 11/16/1982 | CA1135839A1 Stereophonic sound synthesizer |
| 09/15/1982 | EP0060097A1 Split phase stereophonic sound synthesizer |
| 09/14/1982 | US4349698 Audio signal translation with no delay elements |
| 09/14/1982 | US4349697 Sound reproduction system |
| 08/31/1982 | US4347405 Sound reproducing systems utilizing acoustic processing unit |
| 06/01/1982 | US4332979 Electronic environmental acoustic simulator |
| 05/11/1982 | US4329544 Sound reproduction system for motor vehicle |
| 03/23/1982 | US4321428 Acoustic monolithic power semiconductor integrated circuit and acoustic system using the same |
| 03/02/1982 | US4317958 Noise reducing circuit for CTD delay line |
| 12/29/1981 | US4308424 Simulated stereo from a monaural source sound reproduction system |
| 12/02/1981 | EP0040739A1 Arrangement for reproduction of a sound recording by headphones |
| 12/01/1981 | US4303800 Reproducing multichannel sound |
| 09/23/1981 | EP0036337A2 Sound reproducing system having sonic image localization networks |
| 08/11/1981 | US4283600 Recirculationless concert hall simulation and enhancement system |
| 06/23/1981 | US4275267 Ambience processor |
| 06/11/1981 | WO1981001636A1 Audio signal processing system using a signal level gain control element |
| 02/17/1981 | US4251688 Audio-digital processing system for demultiplexing stereophonic/quadriphonic input audio signals into 4-to-72 output audio signals |
| 12/16/1980 | US4239939 Stereophonic sound synthesizer |
| 12/09/1980 | CA1091163A1 Sound processing method and apparatus |
| 12/02/1980 | US4237343 Digital delay/ambience processor |
| 09/17/1980 | EP0015770A1 Stereophonic sound synthesizer |
| 08/26/1980 | US4219696 Sound image localization control system |
| 06/17/1980 | US4208546 Phase stereophonic system |
| 05/20/1980 | US4204092 Audio image recovery system |
| 04/01/1980 | US4196314 Sound distributing system improvements |
| 04/01/1980 | US4196313 Polyphonic sound system |
| 02/12/1980 | US4188504 Signal processing circuit for binaural signals |
| 12/18/1979 | US4179713 Method and equipment for the production of multi-channel sound signal |
| 12/11/1979 | CA1067828A1 Audio system with enhanced spatial effect |
| 09/11/1979 | US4167651 Mixing two signals derived from an audio source without oscillation |
| 08/14/1979 | US4164625 A/C Circuit for combining an automobile radio speaker with speakers of an automobile stereophonic system |
| 04/24/1979 | US4151369 Sound reproduction systems |
| 04/17/1979 | US4150253 Signal distortion circuit and method of use |
| 10/10/1978 | US4119798 Binaural multi-channel stereophony |
| 10/03/1978 | US4118599 Stereophonic sound reproduction system |
| 09/19/1978 | CA1038773A1 Centre channel derivation for stereophonic cinema sound |
| 08/22/1978 | CA1036946A1 Stereophonic reproducing system |
| 08/08/1978 | US4105864 Stereo and spaciousness reverberation system using random access memory and multiplex |
| 06/27/1978 | US4097688 Stereophonic reproducing system |
| 02/14/1978 | US4074083 Stereophonic sound system particularly useful in a cinema auditorium |
| 01/10/1978 | US4068093 Device for transmitting audio-frequency signals |
| 12/13/1977 | US4063034 Audio system with enhanced spatial effect |
| 11/29/1977 | US4060696 Binaural four-channel stereophony |
| 11/15/1977 | US4058675 Loudspeaker system for use in a stereophonic sound reproduction system |
| 10/11/1977 | US4053711 Simulation of reverberation in audio signals |
| 09/20/1977 | US4049912 Channel mixer for multi-channel audio systems |
| 09/13/1977 | US4048442 Stereophonic sound adaptor for simulating sound movement |
| 08/02/1977 | US4039755 Auditorium simulator economizes on delay line bandwidth |
| 07/05/1977 | US4034158 Quadraphonic passive four-channel decoder |
| 05/31/1977 | US4027101 Simulation of reverberation in audio signals |
| 05/17/1977 | US4024344 Center channel derivation for stereophonic cinema sound |
| 02/01/1977 | US4006306 Audio signal processing apparatus |
| 01/18/1977 | US4004095 System for time sharing an audio amplifier |
| 01/11/1977 | US4002835 Multi-channel decoding circuit for two-channel audio systems |
| 11/16/1976 | US3992582 Reverberation sound producing apparatus |
| 07/27/1976 | US3971890 Method and apparatus for quadraphonic enhancement of stereophonic signals |