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 [BibTeX] [Marc21]
Autoregressive Models of Amplitude Modulations in Audio Compression
Type of publication: Idiap-RR
Citation: Ganapathy_Idiap-RR-33-2009
Number: Idiap-RR-33-2009
Year: 2009
Month: 12
Institution: Idiap
Address: Rue Marconi 19, Martigny
Abstract: We present a scalable medium bit-rate wide-band audio coding technique based on frequency domain linear prediction (FDLP). FDLP is an efficient method for representing the long-term amplitude modulations of speech/audio signals using autoregressive models. For the proposed audio codec, relatively long temporal segments (1000 ms) of the input audio signal are decomposed into a set of critically sampled sub-bands using a quadrature mirror filter (QMF) bank. The technique of FDLP is applied on each sub-band to model the sub-band temporal envelopes. The residual of the linear prediction, which represents the frequency modulations in the sub-band signal [1], are encoded and transmitted along with the envelope parameters. These steps are reversed at the decoder to reconstruct the signal. The proposed codec utilizes a simple signal independent non-adaptive compression mechanism for a wide class of speech and audio signals. The subjective and objective quality evaluations show that the reconstruction signal quality for the proposed FDLP codec compares well with the state-of-the-art audio codecs in the 32-64 kbps range.
Projects Idiap
Authors Ganapathy, Sriram
Motlicek, Petr
Hermansky, Hynek
Crossref by Ganapathy_IEEETASLP_2010
Added by: [ADM]
Total mark: 0
  • Ganapathy_Idiap-RR-33-2009.pdf (MD5: bb3ad91e504f97e1fb039404d222db5d)