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. |
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| Projects |
Idiap |
| Authors | |
| Crossref by |
Ganapathy_IEEETASLP_2010 |
| Added by: | [ADM] |
| Total mark: | 0 |
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