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| Number | Title | Issue Date |
| 7660424 | Audio channel spatial translation Using an M:N variable matrix, M audio input signals, each associated with a direction, are translated to N audio output signals, each associated with a direction, wherein N is larger than M, M is two or more and N is a positive integer equal to three or more. The va... | 02/09/2010 |
| 7443987 | Discrete surround audio system for home and automotive listening A sound processing system increases the robustness of surround sound in various playback situations. The system may process an incoming signal, such as a five channel surround sound signal, with a first and a second matrix. The first and second matrices produce outp... | 10/28/2008 |
| 7391869 | Base management systems Sound processing systems have been developed that create a surround effect without quality degradation experienced by known sound processing systems in non-optimum listening environments. The sound processing systems may include matrix decoding systems that manipula... | 06/24/2008 |
| 7392195 | Lossless multi-channel audio codec A lossless audio codec segments audio data within each frame to improve compression performance subject to a constraint that each segment must be fully decodable and less than a maximum size. For each frame, the codec selects the segment duration and coding paramete... | 06/24/2008 |
| 7382886 | Efficient and scalable parametric stereo coding for low bitrate audio coding applications The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic... | 06/03/2008 |
| 7382885 | Multi-channel audio reproduction apparatus and method for loudspeaker sound reproduction using position adjustable virtual sound images A multi-channel audio reproduction apparatus and method for loudspeaker reproduction using virtual sound images whose positions can be adjusted is provided. The multi-channel audio reproduction apparatus includes a virtual sound image forming unit for compensating f... | 06/03/2008 |
| 7367886 | Gaming system with surround sound An electronic gaming system comprises a gaming terminal and a speaker arrangement. The gaming terminal conducts a wagering game. The speaker arrangement emits audio associated with the wagering game in surround sound relative to a player in front of the gaming termi... | 05/06/2008 |
| 7355322 | Ultrasonic transducer, ultrasonic speaker and method of driving and controlling ultrasonic transducer An ultrasonic transducer including: a fixed electrode; a vibrating film placed opposite to a surface of the fixed electrode and having a conducting layer; a member that holds the fixed electrode and vibrating film; the fixed electrode including a driving-use fixed e... | 04/08/2008 |
| 7356152 | Method for expanding an audio mix to fill all available output channels Audio sources in typical computer systems provide different numbers of channels of audio signals to a mixing component of the operating system. This conventional arrangement usually prevents the audio signals from all sources from being played back through all outpu... | 04/08/2008 |
| 7330555 | Coding device and method, and recording medium An L-channel signal and an R-channel signal are input into a subtractor in which the difference between the L-channel signal and the R-channel signal is determined. The resulting signal is input into first and second multipliers. In the first multiplier, a mixed out... | 02/12/2008 |
| 7292901 | Hybrid multi-channel/cue coding/decoding of audio signals Part of the spectrum of two or more input signals is encoded using conventional coding techniques, while encoding the rest of the spectrum using binaural cue coding (BCC). In BCC coding, spectral components of the input signals are downmixed and BCC parameters (e.g.... | 11/06/2007 |
| 7283634 | Method of mixing audio channels using correlated outputs A method of mixing audio channels is effective at rebalancing the audio without introducing unwanted artifacts or overly softening the discrete presentation of the original audio. This is accomplished between any two or more input channels by processing the audio ch... | 10/16/2007 |
| 7277767 | System and method for enhanced streaming audio A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sourc... | 10/02/2007 |
| 7266501 | Method and apparatus for accommodating primary content audio and secondary content remaining audio capability in the digital audio production process The invention enables the inclusion of voice and remaining audio information at different parts of the audio production process. In particular, the invention embodies special techniques for VRA-capable digital mastering, accommodation of PCPV/PCA and/or SCRA signals... | 09/04/2007 |
| 7231054 | Method and apparatus for three-dimensional audio display This invention addresses sound recording and mixing methods for 3-D audio rendering of multiple sound sources over headphones or loudspeaker playback systems. Economical techniques are provided, whereby directional panning and mixing of sounds are performed in a mul... | 06/12/2007 |
| 7221625 | Multi-channel acoustic apparatus with DVD reproduction function In a multi-channel acoustic apparatus with a DVD reproduction function, comprising a DVD reproduction control unit for controlling the reproduction of a DVD, and a system control unit for controlling the overall acoustic apparatus and controlling the reproduction of... | 05/22/2007 |
| 7206413 | Sound processing system using spatial imaging techniques A sound processing system reduces the instances when only a center speaker is heard. The gain of a volume setting is adjusted for individual speakers in response to one or more input signals. The gain of the center speaker is attenuated in relation to the global vol... | 04/17/2007 |
| 7177432 | Sound processing system with degraded signal optimization A sound processing system adaptively mixes active matrix decoding and passive matrix processing of incoming audio signals. Mixed output signals are generated with active matrix decoding where the audio signals are stereo. Mixed output signals are generated with pass... | 02/13/2007 |
| 7164773 | Vehicle electroacoustical transducing An audio system for a vehicle that includes a first passenger location and a second passenger location, the second passenger location situated behind the first passenger location, the audio system including a first directional audio channel signal source; a surround... | 01/16/2007 |
| 7149313 | Audio signal processing A method and apparatus for processing multi-channel audio signals in which the channels are processed by one of alternatively selectable processes to produce an alternatively selectable number of output channels, the process being responsive to information contained... | 12/12/2006 |
| 7116787 | Perceptual synthesis of auditory scenes An auditory scene is synthesized by applying two or more different sets of one or more spatial parameters (e.g., an inter-ear level difference (ILD), inter-ear time difference (ITD), and/or head-related transfer function (HRTF)) to two or more different frequency ba... | 10/03/2006 |
| 7107211 | 5-2-5 matrix encoder and decoder system A sound reproduction system has been developed, for converting signals on two input channels into surround signals on five or seven output channels and vice-versa. A decoder is included in the sound reproduction system which enhances the correlated component of the ... | 09/12/2006 |
| 7085387 | Sound system and method for capturing and reproducing sounds originating from a plurality of sound sources A sound system for capturing and reproducing sounds produced by a plurality of sound sources. The system comprises a device for receiving sounds produced by the plurality of sound sources and converting the separately received sounds to a plurality of separate audio... | 08/01/2006 |
| 7003119 | Matrix surround decoder/virtualizer The inventive mechanism uses several sub-systems to generate outputs from the stereo input signal. A first sub-system synthesizes the phantom center output, which places the monaural center image between the left and right speakers in front of the listener. A second... | 02/21/2006 |
| 6970567 | Method and apparatus for deriving at least one audio signal from two or more input audio signals A multidirectional audio decoder using an “adaptive” audio matrix derives at least one of a plurality of output audio signals from two or more directionally-encoded audio input signal streams (S1(α), S2(α), . . . SN(α), wherein α is the encoded... | 11/29/2005 |
| 6934395 | Surround sound field reproduction system and surround sound field reproduction method A surround sound field reproduction system and method is disclosed by which, in such a case that a listener changes its posture so that a portion of a video image to which attention should be paid may be observed in front of the listener, a sound image can be locali... | 08/23/2005 |
| 6862357 | Vehicle audio system A vehicle audio system has an audio central unit to which one or more further audio components are connected via an associated first data bus, and are interfaced for data communication between the first data bus and a second data bus of another type in the vehicle. ... | 03/01/2005 |
| 6771779 | System, apparatus, and method for improving speech quality in multi-party devices A system and method is disclosed to remove cross talk terms from speech signals in a multi-party conference system using an estimator to first estimate the respective cross talk terms for each of the said plurality of users. In one embodiment, these terms are then m... | 08/03/2004 |
| 6760448 | Compatible matrix-encoded surround-sound channels in a discrete digital sound format Three surround sound channels are provided within the current formats of the Dolby Digital, Sony SDDS and DTS digital soundtrack systems in a manner that provides compatibility with conventional two surround channel playback in standard 5.1 channel and 7.1 channel s... | 07/06/2004 |
| 6697491 | 5-2-5 matrix encoder and decoder system A sound reproduction system has been developed, for converting signals on two input channels into surround signals on five or seven output channels and vice-versa. A decoder is included which enhances the correlated component of the input signals in the d... | 02/24/2004 |
| 6694027 | Discrete multi-channel/5-2-5 matrix system An encode/decode 5-2-5 matrix system is combined with a discrete digital, multi-channel audio system to expand the number of independently addressable output channels. One embodiment of the system provides additional output channels by matrix encoding the... | 02/17/2004 |
| 6687378 | Vehicle-mounted acoustic system A car-borne sound system that reproduces a recorded multi-channel music source in the 5. 1 system or the like system into a natural sound environment in a room of an automobile. Conventionally, at a driver's seat or at a front passenger seat, a sound imag... | 02/03/2004 |
| 6275589 | Method and apparatus for error masking in multi-channel audio signals For audio coding, the MPEG-2 standard provides for a spatial representation by multi-channel reproduction. In order to ensure backwards compatibility with MPEG-1 signals, the signals of the multi-channel sound channels are matrixed. Before being matrixed,... | 08/14/2001 |
| 6240189 | Generating a common bass signal A system for extracting a bass signal from left and right audio input signals of a stereo signal including a differencing circuit generating a difference mode signal from the left and right audio input signals; a detector circuit generating a first coeffi... | 05/29/2001 |
| 6154545 | Method and apparatus for two channels of sound having directional cues The system and method of the present invention provides enhanced surround sound effects. In one embodiment, 90° phase shift and copy of the modified head related transfer functions (HRTF) are applied to each rear sound signal. The modified HRTF for each ... | 11/28/2000 |
| 5841993 | Surround sound system for personal computer for interfacing surround sound with personal computer A surround sound system for personal computer includes a control card and a PC surround decoder. The control card is a PC interface card for interfacing to the personal computer and draining the 5 VDC and &#b1;12 VDC power from the personal computer as po... | 11/24/1998 |
| 5757927 | Surround sound apparatus A surround sound apparatus wherein a decoder decodes directionally encoded audio signals for reproduction via a loudspeaker layout over a listening area wherein the signals are decoded by a matrix. The coefficients of the decoding matrix are such that at ... | 05/26/1998 |
| 5727068 | Matrix decoding method and apparatus A matrix decoding system and method generates left, right, center and surround output signals by adding and subtracting weighted versions of first and second input signals. The output signals are generated using a variable matrix to combine the input sign... | 03/10/1998 |
| 5671287 | Stereophonic signal processor A frequency-dependent linear audio signal processor takes source signals S in input signals and provide directionally spread directionally encoded output signals. The processor directionally encodes with constant gain magnitude frequency components of the... | 09/23/1997 |
| 5602923 | Theater sound system with upper surround channels An improved theater surround sound system incorporates a screen top speaker and an overhead speaker driven by corresponding upper surround channels to more accurately reproduce sounds produced from above the listener. These top surround channels are encod... | 02/11/1997 |