| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 381027000 | Center channel | 19 |
| 20080212786 | METHOD AND APPARATUS TO REPRODUCE MULTI-CHANNEL AUDIO SIGNAL IN MULTI-CHANNEL SPEAKER SYSTEM - A method and an apparatus to reproduce a multi-channel audio signal, in which mixing of a center channel signal is performed with a center channel signal in a home theater system. The method of reproducing a multi-channel audio signal includes calculating a delay value of a center channel signal according to location relationships of a listener, a center channel speaker and other channel speakers, regulating a time delay of the center channel signal according to the calculated delay value, and mixing the time-delay regulated center channel signal with other channel signals. | 09-04-2008 |
| 20080247555 | Stream segregation for stereo signals - Separating a source in a stereo signal having a left channel and a right channel includes transforming the signal into a short-time transform domain; classifying portions of the signals having similar panning coefficients; segregating a selected one of the classified portions of the signals corresponding to the source; and reconstructing the source from the selected portions of the signals. | 10-09-2008 |
| 20080298597 | Spatial Sound Zooming - Aspects of the invention provide methods, computer-readable media, and apparatuses for digital processing of acoustic signals to create a reproduction of a natural or an artificial spatial sound environment. An aspect of the invention supports spatial audio processing such as extracting a center channel in up-mixing stereo sound for multi-channel loudspeaker setup or headphone virtualization. An aspect of the invention also supports directional listening in which sound sources in a desired direction may be amplified or attenuated. Direction and diffuseness parameters for regions of input channels are determined and an extracted channel is extracted from the input channels according to the direction and diffuseness parameters. A gain estimate is estimated for each signal component being fed into the extracted channel and an extracted channel may be synthesized from a base signal and the gain estimate. The input channels may be partitioned into a plurality of time-frequency regions. | 12-04-2008 |
| 20090022328 | METHOD AND APPARATUS FOR GENERATING A STEREO SIGNAL WITH ENHANCED PERCEPTUAL QUALITY - A stereo signal with enhanced perceptual quality using a mid-signal and a side-signal, can be generated, when a enhanced side signal is created prior to the upmix of the stereo signal. A decorrelated representation of at least a portion of the sum signal and/or a decorrelated representation of at least a portion of the side-signal is generated. | 01-22-2009 |
| 20090086984 | Method and Apparatus for Reducing Noise in an Audio Signal - A technique for reducing inherent noise in a real time digital audio wireless system. The technique allows for low power stereo analog to digital and digital to analog converters to be used in a battery operated real time digital audio wireless applications. The audio signal is sent to the left and right channels of an analog to digital converter with a preceding audio amp of different gain at the input to each channel. The signals are simultaneously digitized then combined to generate a new digital value resulting in noise reduction at lower amplitudes. This new data word is then transmitted via radio waves to a digital audio receiver. Once the data is received it is output simultaneously to a stereo digital to analog converter. The digital to analog conversion of both left and right channels is then summed using a resistor network and an audio amplifier. The audio amplifier output is then reduced to create further reduction of noise at all amplitudes. | 04-02-2009 |
| 20090136048 | APPARATUS AND METHOD FOR REPRODUCING SURROUND WAVE FIELD USING WAVE FIELD SYNTHESIS - Provided are an apparatus and a method for reproducing a surround wave field using wave field synthesis. The apparatus includes an audio signal analyzer for analyzing a received multi-channel audio signal to check the number of audio signal channels, and extracting a sound source signal for each checked channel from the multi-channel audio signal; a wave field synthesis renderer for localizing the extracted sound source signal for each channel at a virtual sound image outside a narrow space using wave field synthesis so that the extracted sound source signal is suitable for the number of the checked audio signal channels; and an audio reproducer for reproducing the localized virtual sound source signal. | 05-28-2009 |
| 20090304189 | Rendering Center Channel Audio - An audio upmixer, such as a two-channel to three-channel upmixer, employs a difference in a measure of sound at the ears of a listener in accordance with first and second models, one based on a reproduction of the original channels and the other based on a reproduction of the upmixed channels. The difference is minimized while simultaneously causing a, portion of one or more of the stereophonic channels to be applied to the center loudspeaker under some conditions of the signals in the stereophonic channels, the portion being commensurate with the value of a weighting factor, such that the weighting factor controls a balance between two opposing conditions, one in which no signals are applied to the center loudspeaker and another in which no signals are applied to the left and right loudspeakers. | 12-10-2009 |
| 20100272269 | CENTER CHANNEL POSITIONING APPARATUS - A center channel positioning apparatus is provided, which does not cause strange feeling in sound quality even at a position apart from an original listener position. | 10-28-2010 |
| 20110038485 | NONLINEAR FILTER FOR SEPARATION OF CENTER SOUNDS IN STEREOPHONIC AUDIO - In accordance with some embodiments of the present invention there is provided a system, a method and a circuit for processing a stereo audio signal. According to some embodiments, the system for processing a stereo audio signal may include an audio processing circuit. The audio processing module or circuit may be operatively connected to an audio input interface and to an output audio interface. Through the audio input interface, the audio processing circuit may be adapted for receiving a 2-channels stereo audio signal. The audio processing module may be adapted for determining an output mono audio signal representing the center sound and a stereo audio signal representing the stereo sound without the center. Through the output interface the audio processing circuit may provide each of an output mono audio signal representing the center sound and a stereo audio signal representing the stereo sound without the center. | 02-17-2011 |
| 20140072124 | APPARATUS AND METHOD AND COMPUTER PROGRAM FOR GENERATING A STEREO OUTPUT SIGNAL FOR PROVIING ADDITIONAL OUTPUT CHANNELS - An apparatus for generating a stereo output signal includes a manipulation information generator being adapted to generate manipulation information depending on a first signal indication value of a first input channel and on a second signal indication value of a second input channel, and a manipulator for manipulating a combination signal based on the manipulation information to obtain a first manipulated signal as a first output channel and a second manipulated signal as a second output channel. The combination signal is a signal derived by combining the first input channel and the second input channel. Furthermore, the manipulator is configured for manipulating the combination signal in a first manner, when the first signal indication value is in a first relation to the second signal indication value, or in a different second manner, when the first signal indication value is in a different second relation to the second signal indication value. | 03-13-2014 |
| 20140247947 | SOUND SEPARATION DEVICE AND SOUND SEPARATION METHOD - A sound separation device includes: a signal obtainment unit which obtains a plurality of acoustic signals including a first acoustic signal and a second acoustic signal; a differential signal generation unit which generates a differential signal that is a signal representing a difference in a time domain between the first acoustic signal and the second acoustic signal; an acoustic signal generation unit which generates, using at least one acoustic signal among the acoustic signals, a third acoustic signal; and an extraction unit which generates a frequency signal by subtracting, from a signal obtained by transforming the third acoustic signal into a frequency domain, a signal obtained by transforming the differential signal into a frequency domain, and generates a separated acoustic signal by transforming the generated frequency signal into a time domain. | 09-04-2014 |
| 20140270192 | ACOUSTIC TRANSDUCERS - The invention generally relates to acoustic transducers. In certain aspects, the acoustic transducer includes a speaker in the base of the transducer for emitting acoustic energy at a first range of frequencies. The transducer may also include a diaphragm coupled to the base that is configured to emit acoustic energy at a second range of frequencies. Transducers of the invention may also include at least one actuator coupled to the diaphragm to cause movement of the diaphragm and thus, the acoustic energy at the second range of frequencies. | 09-18-2014 |
| 20140270193 | ACOUSTIC TRANSDUCERS HAVING A CONNECTOR BETWEEN AN ACTUATOR AND A DIAPHRAGM - The invention generally relates to acoustic transducers. In certain aspects, the acoustic transducer includes a diaphragm and an actuator. In further aspects, the acoustic transducer includes a connector having a planar proximal end that tapers to a distal end. The proximal end may be coupled to the diaphragm and the distal end coupled to the actuator, such that the actuator causes movement of the diaphragm. In additional aspects, the acoustic transducer includes a connector having a proximal end that couples to the diaphragm and a distal end that couples to the actuator. The proximal end of the connector can include a damping element. In other aspects, the diaphragm includes a connector, in which the connector tapers to a distal end that is configured to mate with the actuator such that the actuator causes movement of the diaphragm. | 09-18-2014 |
| 20140355773 | BROAD SOUND LOUDSPEAKER SYSTEM - A sound system processor for converting left and right channel signals from an audio source into composite left and right signals and employing a mid-side processor, at least one low and high pass filters, and one or more sum processors, together which create at least two or more composite signals for delivery to speaker drivers to generate a broad sound field from a compact multi-speaker sound system source. | 12-04-2014 |
| 20150016614 | Pre-Processing of a Channelized Music Signal - A method for pre-processing a channelized music signal to improve perception and appreciation for a hearing prosthesis recipient. In one example, the channelized music signal is a stereo input signal. A device, such as a handheld device, hearing prosthesis, or audio cable, for example, applies a mask to a stereo input signal to extract a center-mixed component from the stereo signal and outputs an output signal comprised of a weighted combination of the extracted center-mixed component and a residual signal comprising a non-extracted part of the stereo input signal. The center-mixed component may contain components, such as leading vocals and/or drums, preferred by hearing prosthesis recipients relative to other components, such as backing vocals or other instruments. | 01-15-2015 |
| 20150104022 | Audio Processing Method and Audio Processing Apparatus - An audio processing method and apparatus are described. In one embodiment, at least one first sub-band of a first audio signal is suppressed to obtain a reduced first audio signal with reserved sub-bands; suppressing at least one second sub-band of the at least one second audio signal to obtain at least one reduced second audio signal with reserved sub-bands; and mixing the reduced first audio signal and at least one reduced second audio signal. Alternatively, a first spatial auditory property is assigned to a first audio signal so that the first audio signal may be perceived as originating from a first position. Alternatively, rhythmic similarity between at least two audio signals is detected, and time scaling is applied to an audio signal in response to relatively high rhythmic similarity between the audio signal and the other audio signal(s); and then at least two audio signals are mixed. | 04-16-2015 |
| 20150334501 | Method and Apparatus for Generating Sideband Residual Signal - A method and an apparatus for generating a sideband residual signal. The method includes comparing energy of a first signal input by a first sound channel with energy of a second signal input by a second sound channel, if the energy of the first signal is greater than the energy of the second signal, generating a sideband residual signal by allocating a monophonic quantization error to the first signal, and if the energy of the first signal is smaller than the energy of the second signal, generating a sideband residual signal by allocating a monophonic quantization error to the second signal. By using the method and apparatus provided in the embodiments of the present invention, it can be avoided that a monophonic quantization error has a greater impact on a signal whose energy is smaller. | 11-19-2015 |
| 20160037283 | APPARATUS AND METHOD FOR CENTER SIGNAL SCALING AND STEREOPHONIC ENHANCEMENT BASED ON A SIGNAL-TO-DOWNMIX RATIO - An apparatus for generating a modified audio signal having two or more modified audio channels from an audio input signal comprising two or more audio input channels is provided. The apparatus has an information generator for generating signal-to-downmix information. The information generator is adapted to generate signal information by combining a spectral value of each of the two or more audio input channels in a first way. The information generator is adapted to generate downmix information by combining the spectral value of each of the two or more audio input channels in a second way being different from the first way. Furthermore, the information generator is adapted to combine the signal information and the downmix information to obtain signal-to-downmix information. The apparatus has a signal attenuator for attenuating the two or more audio input channels depending on the signal-to-downmix information to obtain the two or more modified audio channels. | 02-04-2016 |
| 20160073158 | MULTIMEDIA AUDIO INSERTER - In one embodiment, a multimedia audio inserter removes the left and right audio channel data from a multimedia signal, for example an HDMI® signal and replaces it with an alternate audio signal, which may be the center channel audio signal provided by a digital surround sound receiver. In exemplary applications, the resulting, modified multimedia signal may be provided to a digital television that is part of a surround sound system, enabling the television to play the center channel signal through its speakers. Optionally, the multimedia audio inserter may provide a copy of the multimedia signal at a multimedia feedthrough output. In exemplary applications, the multimedia feedthrough output may be used to play left and right channel audio, present in the HDMI® signal, through dedicated left and right speakers. | 03-10-2016 |
