Patent
Adaptive time/frequency-based audio encoding and decoding apparatuses and methods
Jung-Hoe Kim,Eun-Mi Oh,Chang-Yong Son,Ki-Hyun Choo +3 more
- 08 Nov 2006
55
TL;DR: Adaptive time/frequency-based audio encoding and decoding apparatuses and methods are presented in this paper, where acoustic characteristics and a voicing model are simultaneously applied to a frame, which is an audio compression processing unit.
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Abstract: Adaptive time/frequency-based audio encoding and decoding apparatuses and methods. The encoding apparatus includes a transformation & mode determination unit to divide an input audio signal into a plurality of frequency-domain signals and to select a time-based encoding mode or a frequency-based encoding mode for each respective frequency-domain signal, an encoding unit to encode each frequency-domain signal in the respective encoding mode, and a bitstream output unit to output encoded data, division information, and encoding mode information for each respective frequency-domain signal. In the apparatuses and methods, acoustic characteristics and a voicing model are simultaneously applied to a frame, which is an audio compression processing unit. As a result, a compression method effective for both music and voice can be produced, and the compression method can be used for mobile terminals that require audio compression at a low bit rate.
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Citations
Patent
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Per Hedelin,Pontus Jan Carlsson,Jonas Samuelsson,Michael Schug +3 more
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TL;DR: In this article, a linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; and a quantization unit for quantizing the transform domain signal.
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Encoder, decoder and methods for encoding and decoding data segments representing a time-domain data stream
Geiger Ralf,Max Neuendorf,Yokotani Yoshikazu,Nikolaus Rettelbach,Herre Juergen,Geyersberger Stefan +5 more
- 07 Dec 2007
TL;DR: An apparatus for decoding data segments representing a time-domain data stream, a data segment being encoded in the time domain or in the frequency domain, having successive blocks of data representing successive and overlapping blocks of time domain data samples was proposed in this article.
85
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method and an apparatus for processing a signal
Hyen O Oh,Yang Won Jung +1 more
- 09 Dec 2008
TL;DR: In this article, the mode information is used for indicating that a prescribed mode corresponds to which one of at least three modes, and the mode is used to indicate whether a given signal corresponds to one of the three modes.
80
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Low bitrate audio encoding/decoding scheme having cascaded switches
Bernhard Grill,Roch Lefebvre,Bessette Bruno,Jimmy Lapierre,Philippe Gournay,Redwan Salami,Stefan Bayer,Guillaume Fuchs,Geyersberger Stefan,Geiger Ralf,Hilpert Johannes,Kraemer Ulrich,Jeremie Lecomte,Markus Multrus,Max Neuendorf,Harald Popp,Nikolaus Rettelbach +16 more
- 26 Jun 2009
TL;DR: In this paper, an audio encoder comprises a first information sink oriented encoding branch such as a spectral domain encoding branch, a second information source or SNR oriented encoder such as an LPC-domain decoding branch, and a switch for switching between the first encoding branch and the second encoding branch.
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Apparatus and method for encoding and decoding signal for high frequency bandwidth extension
Ki-hyun Choo,Eunmi Oh,Ho-Sang Sung +2 more
- 28 Dec 2011
TL;DR: In this article, an apparatus and method for encoding and decoding a signal for high frequency bandwidth extension are provided. But the method is not suitable for the case of time domain input signals.
59
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