Multichannel Audio Signal Coding And Decoding, I.e., Using Interchannel Correlation To Reduce Redundancies, E.g., Joint-stereo, Intensity-coding, Matrixing, Etc. (epo) Patents (Class 704/E19.005)
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Publication number: 20080319765Abstract: An apparatus for decoding a signal and method thereof are disclosed, by which the audio signal can be controlled in a manner of changing/giving spatial characteristics (e.g., listener's virtual position, virtual position of a specific source) of the audio signal. The present invention includes receiving an object parameter including level information corresponding to at least one object signal, converting the level information corresponding to the object signal to the level information corresponding to an output channel by applying a control parameter to the object parameter, and generating a rendering parameter including the level information corresponding to the output channel to control an object downmix signal resulting from downmixing the object signal.Type: ApplicationFiled: January 19, 2007Publication date: December 25, 2008Applicant: LG ELECTRONICS INC.Inventors: Hyen-O Oh, Hee Suk Pang, Dong Soo Kim, Jae Hyun Lim, Yang-Won Jung
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Publication number: 20080306745Abstract: The aim of the invention is to provide inter-channel level differences ICLD related to audio signals for hearing aids.Type: ApplicationFiled: May 30, 2008Publication date: December 11, 2008Inventors: Olivier ROY, Martin VETTERLI
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Publication number: 20080288263Abstract: An encoding method and apparatus and a decoding method and apparatus are provided. The encoding method includes encoding data, generating a data bit array comprising the encoded data and encoding information, and generating an align bit array comprising one or more Is. According to the encoding method and apparatus and the decoding method and apparatus, it is possible to enhance the quality of decoded data by inserting various information into an align bit array that is included in a bitstream for aligning a plurality of encoded data bit arrays with one another. In addition, according to the encoding method and apparatus and the decoding method and apparatus, it is possible to efficiently utilize data bandwidths that are allocated for the encoding/decoding of data at low bitrates by enhancing the efficiency of data encoding.Type: ApplicationFiled: September 14, 2006Publication date: November 20, 2008Applicant: LG ELECTRONICS, INC.Inventors: Yang-Won Jung, Hee Suk Pang, Hyen-O Oh, Dong Soo Kim, Jae Hyun Lim
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Patent number: 7437299Abstract: 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 including most of the signal energy and at least one residual signal including less energy than the principal signal. The predetermined transformation is parameterized by at least one transformation parameter. The method further includes representing the multichannel signal at least by the principal signal and the transformation parameter.Type: GrantFiled: March 20, 2003Date of Patent: October 14, 2008Assignee: Koninklijke Philips Electronics N.V.Inventors: Ronaldus Maria Aarts, Roy Irwan
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Publication number: 20080243520Abstract: A method of encoding a multi-channel audio signal including at least a first signal component (LF), a second signal component (LR) and a third signal component (RF). The method comprises the steps of encoding the first and second signal components by a first parametric encoder (202) resulting in a first encoded signal (L) and a first set of encoding parameters (P2); encoding the first encoded signal and a further signal (R) by a second parametric encoder (201), resulting in a second encoded signal (T) and a second set of encoding parameters (P1), where the further signal is derived from at least the third signal component; and representing the multi-channel audio signal at least by a resulting encoded signal (T) derived from at least the second encoded signal, by the first set of encoding parameters and by the second set of encoding parameters.Type: ApplicationFiled: June 10, 2008Publication date: October 2, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventor: Dirk Jeroen Breebaart
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Publication number: 20080205676Abstract: A frequency domain method for phase-amplitude matrixed surround decoding of 2-channel stereo recordings and soundtracks, based on spatial analysis of 2-D or 3-D directional cues in the recording and re-synthesis of these cues for reproduction on any headphone or loudspeaker playback system.Type: ApplicationFiled: March 12, 2008Publication date: August 28, 2008Applicant: CREATIVE TECHNOLOGY LTDInventors: Juha MERIMAA, Jean-Marc JOT, Michael M. GOODWIN, Arvindh KRISHNASWAMY, Jean LAROCHE
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Publication number: 20080201152Abstract: A method and/or apparatus for encoding and/or decoding an audio signal is disclosed, in which a downmix gain is applied to a downmix signal in an encoding apparatus which, in turn, transmits, to a decoding apparatus, a bitstream containing information as to the applied downmix gain. The decoding apparatus recovers the downmix signal, using the downmix gain information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the encoding apparatus can apply an arbitrary downmix gain (ADG) to the downmix signal, and can transmit a bitstream containing information as to the applied ADG to the decoding apparatus. The decoding apparatus recovers the downmix signal, using the ADG information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the method and/or apparatus can also vary the energy level of a specific channel, and can recover the varied energy level.Type: ApplicationFiled: June 30, 2006Publication date: August 21, 2008Inventors: Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim, Yang Won Jung, Sung Young Yoon
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Publication number: 20080140426Abstract: Provided are an audio encoding method and apparatus and an audio decoding method and apparatus in which audio signals can be encoded or decoded so that sound images can be localized at any desired position for each object audio signal. The audio decoding method generating a third downmix signal by combining a first downmix signal extracted from a first audio signal and a second downmix signal extracted from a second audio signal; generating third object-based side information by combining first object-based side information extracted from the first audio signal and second object-based side information extracted from the second audio signal; converting the third object-based side information into channel-based side information; and generating a multi-channel audio signal using the third downmix signal and the channel-based side information.Type: ApplicationFiled: October 1, 2007Publication date: June 12, 2008Inventors: Dong Soo KIM, Hee Suk PANG, Jae Hyun LIM, Sung Yong YOON, Hyun Kook LEE
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Publication number: 20080130917Abstract: An audio codec in a wireless device may be utilized for up sampling two or more audio signals to a same data sampling rate. Each audio signal, such as digital audio, voice, and polyringer, for example, may be received at one of a plurality of data sampling rates. Audio signals may be equalized and/or compensated with an FIR filter before up sampling or with an IIR filter to reduce overall processing latency. Multiple half-band interpolation operations may perform the up sampling. The first half-band filter may be replaced by an IIR filter to reduce overall processing latency. A gain of the up-sampled data may be adjusted to reduce noise effects. The channels of the up-sampled audio signals may be mixed and later further up sampled for subsequent communication to an output device. The up-sampled mixed audio signals may be down sampled for communication to a Bluetooth radio.Type: ApplicationFiled: November 30, 2006Publication date: June 5, 2008Inventors: Hongwei Kong, Huaiyi (Hanks) Zeng, Nelson Sollenberger, Li Fung Chang, Taiya Cheng, Claude Hayek
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Publication number: 20080097766Abstract: A method, medium, and apparatus encoding and/or decoding a multichannel audio signal. The method includes detecting the type of spatial extension data included in an encoding result of an audio signal, if the spatial extension data is data indicating a core audio object type related to a technique of encoding core audio data, detecting the core audio object type; decoding core audio data by using a decoding technique according to the detected core audio object type, if the spatial extension data is residual coding data, decoding the residual coding data by using the decoding technique according to the core audio object type, and up-mixing the decoded core audio data by using the decoded residual coding data. According to the method, the core audio data and residual coding data may be decoded by using an identical decoding technique, thereby reducing complexity at the decoding end.Type: ApplicationFiled: October 11, 2007Publication date: April 24, 2008Applicant: Samsung Electronics Co., Ltd.Inventors: Jung-hoe Kim, Eun-mi Oh
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Publication number: 20080097750Abstract: During production, at least one audio signal is processed in order to derive instructions for channel reconfiguring it. The at least one audio signal and the instructions are stored or transmitted. During consumption, the at least one audio signal is channel reconfigured in accordance with the instructions. Channel reconfiguring includes upmixing, downmixing, and spatial reconfiguration. By determining the channel reconfiguration instructions during production, processing resources during consumption are reduced.Type: ApplicationFiled: December 3, 2007Publication date: April 24, 2008Applicants: Dolby Laboratories Licensing CorporationInventors: Alan Seefeldt, Mark Vinton, Charles Robinson
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Publication number: 20080091439Abstract: 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., inter-channel level and/or time differences) are generated. In a stereo implementation, after converting the left and right channels to the frequency domain, pairs of left- and right-channel spectral components are downmixed to mono. The mono components are then converted back to the time domain, along with those left- and right-channel spectral components that were not downmixed, to form hybrid stereo signals, which can then be encoded using conventional coding techniques. For playback, the encoded bitstream is decoded using conventional decoding techniques. BCC synthesis techniques may then apply the BCC parameters to synthesize an auditory scene based on the mono components as well as the unmixed stereo components.Type: ApplicationFiled: December 10, 2007Publication date: April 17, 2008Applicant: AGERE SYSTEMS INC.Inventors: Frank Baumgarte, Peter Kroon
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Publication number: 20080033732Abstract: During production, at least one audio signal is processed in order to derive instructions for channel reconfiguring it. The at least one audio signal and the instructions are stored or transmitted. During consumption, the at least one audio signal is channel reconfigured in accordance with the instructions. Channel reconfiguring includes upmixing, downmixing, and spatial reconfiguration. By determining the channel reconfiguration instructions during production, processing resources during consumption are reduced.Type: ApplicationFiled: July 31, 2007Publication date: February 7, 2008Inventors: Alan Seefeldt, Mark Vinton, Charles Quito Robinson
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Publication number: 20080027711Abstract: A method for including an identifier with a packet associated with a speech signal is described. A signal is received. The signal is partitioned into a plurality of frames. A frame of the signal is encoded into a packet. A determination is made if the packet is encoded as a wideband packet or a narrowband packet. An identifier is packed in the packet based on the determination. The packet is transmitted. At least two illegal values are provided from an N-bit parameter, wherein at least one bit from the N-bit parameter is used to carry information. A number of bits from the N-bit parameter that are used to carry information is equal to log2(X), wherein X is the number of illegal values provided from the N-bit parameter.Type: ApplicationFiled: February 21, 2007Publication date: January 31, 2008Inventors: Vivek Rajendran, Ananthapadmanabhan A. Kandhadai