Patent
Method, medium, and system encoding and/or decoding audio signals by using bandwidth extension and stereo coding
Eunmi Oh,Ki-hyun Choo,Jung-Hoe Kim +2 more
- 21 Sep 2007
29
TL;DR: In this article, a method, medium, and system encoding and/or decoding an audio signal by extracting stereo parameters from an input signal, encoding the stereo parameters, and performing down-mixing on the input signal to a down-mixed signal, splitting the down mixed signal into a low band signal and a high band signal.
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Abstract: A method, medium, and system encoding and/or decoding an audio signal by extracting stereo parameters from an input signal, encoding the stereo parameters, and performing down-mixing on the input signal to a down-mixed signal, splitting the down-mixed signal into a low band signal and a high band signal, determining whether to encode the low band signal in a time domain or a frequency domain, if the low band signal is determined to be encoded in the time domain, encoding the low band signal in the time domain, if the low band signal is determined to be encoded in the frequency domain, generating an encoded bitplane by converting the low band signal from the time domain to the frequency domain by using a first conversion method and performing quantization and context-dependent encoding on the low band signal converted to the frequency domain by using the first conversion method, converting each of the low band signal and the high band signal from the time domain to the frequency domain or a time/frequency domain by using a second conversion method, generating and encoding bandwidth extension information that represents a characteristic of the high band signal converted by the second conversion method by using the low band signal converted by the second conversion method, and outputting the encoded stereo parameters, the encoded bitplane, and the encoded bandwidth extension information a result of encoding the input signal. Accordingly, high frequency components and stereo components may be efficiently encoded and decoded at a potential restricted bit rate, thereby improving the quality of an audio signal.
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Citations
Patent
Fm stereo radio receiver by using parametric stereo
Jan Mueller,Robin Thesing,Michael Beer +2 more
- 20 Jul 2012
TL;DR: In this paper, the authors proposed an apparatus for improving a stereo audio signal of an FM stereo radio receiver using a standard HE-ACC v2 decoder and an encoder.
Patent
Stereo signal coding and decoding method and coding and decoding apparatus
Shlomot Eyal,Gibbs Jonathan Alastair,Li Haiting +2 more
- 22 Oct 2020
TL;DR: In this paper, a spectrum-broadened LSF parameter of the primary channel signal was used to reduce the amount of bits required for signal decoding in stereo signal encoding and decoding.
Patent
Apparatus and method for encoding and decoding of integrated speech and audio utilizing a band expander with a spectral band replication to output the audio or speech to a frequency domain encoder or an LPC encoder
Taejin Lee,Seung Kwon Baek,Minje Kim,Dae Young Jang,Jeong-Il Seo,Kang Kyeong Ok,Hong Jin Woo,Hochong Park,Young-Cheol Park +8 more
- 26 Jan 2015
TL;DR: In this article, a method for integrally encoding and decoding a speech signal and a audio signal is presented. But the method is not suitable for the first-convolutional encoder and the second-decoder.
Patent
Method and apparatus for classifying audio signals into fast signals and slow signals
Yang Gao
- 15 Apr 2015
TL;DR: In this paper, the authors focus on classifying signal into fast signal and slow signal, based on at least one of the following parameters or a combination of spectral sharpness, temporal sharpness and pitch correlation (pitch gain).
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