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| Number | Title | Issue Date |
| 7646875 | Stereo coding and decoding methods and apparatus thereof A method of encoding input signals (l, r) to generate encoded data (100) is provided. The method involves processing the input signals (l, r) to determine first parameters (φ1, φ2) describing relative phase difference and temporal diff... | 01/12/2010 |
| 7602922 | Multi-channel encoder There is described a multi-channel encoder (10; 600) for processing input signals conveyed in N input channels to generate corresponding output signals conveyed in M output channels together with complementary parametric data; M and N are integers wherein N>M... | 10/13/2009 |
| 7564978 | Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods A multi-channel decoder is provided for decoding a mono signal and an associated inter-channel coherence measure, the inter-channel coherence measure representing a coherence between a plurality of original channels, the mono signal being derived from the plurality ... | 07/21/2009 |
| 7539316 | Configurable filter for processing television audio signals A television audio signal encoder includes a matrix that sums a left channel audio signal and a right channel audio signal to produce a sum signal. The matrix also subtracts one of the left and right audio signals from the other to produce a difference signal. The e... | 05/26/2009 |
| 7532728 | Mechanism for using the allpass decomposition architecture for the cauer low pass filter used in a BTSC An BTSC encoder with an improved digital filter structure substantially implemented on a single CMOS integrated circuit is described. By cascading first and second order allpass filter structures to form a higher order digital filter, such as a Cauer low pass filter... | 05/12/2009 |
| 7447317 | Compatible multi-channel coding/decoding by weighting the downmix channel In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels. For a selected original channel of the original channels, channel sid... | 11/04/2008 |
| 7437299 | Coding of stereo signals A method of encoding a multichannel signal, such as a stereophonic audio signal, including at least first and second signal components includes transforming at least the first and second signal components by a predetermined transformation into a principal signal inc... | 10/14/2008 |
| 7428308 | Transmitting and reproducing stereophonic audio signals Apparatus and method for transmitting and reproducing stereophonic audio signals are disclosed. The method comprises splitting first and second channels into two frequency bands, combining the lower frequency band signals of the two channels, and transmitting the co... | 09/23/2008 |
| 7394903 | Apparatus and method for constructing a multi-channel output signal or for generating a downmix signal The apparatus for constructing a multi-channel output signal using an input signal and parametric side information, the input signal including the first input channel and the second input channel derived from an original multi-channel signal, and the parametric side... | 07/01/2008 |
| 7391870 | Apparatus and method for generating a multi-channel output signal An apparatus for generating a multi-channel output signal performs a center channel cancellation to obtain improved base channels for reconstructing left-side output channels or right-side output channels. In particular, the apparatus includes a cancellation channel... | 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 |
| 7340103 | Adaptive entropy encoding/decoding for screen capture content Adaptive entropy encoding and decoding techniques are described. For example, a screen capture encoder and decoder perform adaptive entropy encoding and decoding of palettized screen capture content in screen capture video. The encoder selects between different entr... | 03/04/2008 |
| 7330552 | Multiple positional channels from a conventional stereo signal pair A method and system accept left and right channel inputs of audio data and provide output audio data for at least three channels in a fashion that may effect a facsimile of the original soundstage on which the left and right inputs were recorded. ... | 02/12/2008 |
| 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 |
| 7295141 | Method for mixing signals with an analog-to-digital converter The invention provides a method for mixing signals with an analog-to-digital converter. The analog-to-digital converter receives a plurality of analog signals. First, the plurality of analog signals are respectively converted to a plurality of first datastreams with... | 11/13/2007 |
| 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 |
| 7289633 | System and method for integral transference of acoustical events 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... | 10/30/2007 |
| 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 |
| 7280664 | Method for apparatus for audio matrix decoding A method derives at least three audio signals, each associated with a direction, from two input audio signals. In response to the two input signals, a passive matrix generates a plurality of passive matrix audio signals, including two pairs of passive matrix audio s... | 10/09/2007 |
| 7277692 | System and method of collecting audio data for use in establishing surround sound recording A system and method for collecting audio data for use in establishing an audio recording such as a surround sound recording are described. One exemplary method includes recording audio data at a plurality of mobile terminals located in a plurality of location zones ... | 10/02/2007 |
| 7240014 | Audio signal processing apparatus In an audio signal encoding apparatus, a first audio signal and a second audio signal are added into an addition-result signal. The first audio signal is subtracted from the second audio signal to generate a subtraction-result signal. A first difference signal is ge... | 07/03/2007 |
| 7236839 | Audio decoder with expanded band information An audio processing unit that provides a high-sound-quality reproduction even when a band property of an input encoded signal drops at or below a Nyquist frequency. The audio processing unit has a band-variable bandpass filter 1500; a band determining section... | 06/26/2007 |
| 7236933 | Audio signal processing apparatus In an audio signal encoding apparatus, a first audio signal and a second audio signal are added into an addition-result signal. The first audio signal is subtracted from the second audio signal to generate a subtraction-result signal. A first difference signal is ge... | 06/26/2007 |
| 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 |
| 7224385 | Video camera with multiple microphones and audio processor producing one signal for recording A video camera capable of recording and/or reproducing multiple channel audio signals and video signals simultaneously in a single recording medium in such a manner as to reproduce omnidirectional ambient sounds as surround sound. The video camera includes a number ... | 05/29/2007 |
| 7219053 | Audio signal processing apparatus In an audio signal encoding apparatus, a first audio signal and a second audio signal are added into an addition-result signal. The first audio signal is subtracted from the second audio signal to generate a subtraction-result signal. A first difference signal is ge... | 05/15/2007 |
| 7218790 | Adaptive entropy encoding/decoding for screen capture content Adaptive entropy encoding and decoding techniques are described. For example, a screen capture encoder and decoder perform adaptive entropy encoding and decoding of palettized screen capture content in screen capture video. The encoder selects between different entr... | 05/15/2007 |
| 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 |
| 7181019 | Audio coding Parametric stereo coders use perceptually relevant parameters of the input signal to describe spatial properties. One of these parameters is the phase difference between the input signals (ITD or IPD). This time difference only determines the relative time differenc... | 02/20/2007 |
| 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 |
| 7164768 | Audio signal processing A method for processing and transducing audio signals. An audio system has a first audio signal and a second audio signal that have amplitudes. A method for processing the audio signals includes dividing the first audio signal into a first spectral band signal and a... | 01/16/2007 |
| 7164769 | Multichannel spectral mapping audio apparatus and method with dynamically varying mapping coefficients A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conventional ste... | 01/16/2007 |
| 7138576 | Sound system and method for creating a sound event based on a modeled sound field A sound system and method for modeling a sound field generated by a sound source and creating a sound event based on the modeled sound field is disclosed. The system and method captures a sound field over an enclosing surface, models the sound field and enables repr... | 11/21/2006 |
| 7136491 | Audio signal processing apparatus In an audio signal encoding apparatus, a first audio signal and a second audio signal are added into an addition-result signal. The first audio signal is subtracted from the second audio signal to generate a subtraction-result signal. A first difference signal is ge... | 11/14/2006 |
| 7136346 | Record carrier method and apparatus having separate formats for a stereo signal and a data signal A record carrier carries a stereo signal and a data signal which includes a first data portion and a remaining data portion. A first channel on the record carrier includes a composite signal which is obtained by combining the stereo signal and the first data portion... | 11/14/2006 |
| 7130280 | Enhanced call service packet data terminal In communication system (200), a packet data terminal (102) (e.g., personal computer (PC), personal digital assistant (PDA), telephone, mobile radiotelephone, network access device, Internet peripheral, and the like) initiates, coordinates, and control... | 10/31/2006 |
| 7082201 | Three-dimensional sound reproducing apparatus and a three-dimensional sound reproduction method A three-dimensional sound reproducing apparatus is configured by cascading a sound field effect adding unit and a crosstalk canceling unit. The sound field effect adding unit adds a predetermined three-dimensional sound field effect to an input audio signal, thereby... | 07/25/2006 |
| 7072726 | Converting M channels of digital audio data into N channels of digital audio data Audio data having M channels includes a header with metadata specifying a conversion function for converting the M channels of digital audio data into N channels of data. The metadata is a string of coefficients, which may be specified by the content author, to defi... | 07/04/2006 |
| 7068792 | Enhanced spatial mixing to enable three-dimensional audio deployment A network device and its mode of operation. The network device includes an input port through which audio streams may be received. A controller receives a user input indicating which type of mix the user wants applied to the audio stream and applies the mixing facto... | 06/27/2006 |