Spectral noise shaping: improvements in speech/audio codec based on linear prediction in spectral domain

Ganapathy, Sriram; Motlíček, Petr; Heřmanský, Hynek; Garudadri, Harinath

doi:10.21437/interspeech.2008-215

Cited by 1 publication

(1 citation statement)

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“…The proposed WB-FDLP audio codec exploits SNS technique to overcome problems in encoding tonal signals [33]. It is based on the fact that tonal signals are highly predictable in the time domain.…”

Section: Spectral Noise Shaping (Sns)mentioning

confidence: 99%

Wide-Band Audio Coding Based on Frequency-Domain Linear Prediction

Motlíček¹,

Ganapathy²,

Heřmanský³

et al. 2010

EURASIP Journal on Audio, Speech, and Music Processing

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We revisit an original concept of speech coding in which the signal is separated into the carrier modulated by the signal envelope. A recently developed technique, called frequency-domain linear prediction (FDLP), is applied for the efficient estimation of the envelope. The processing in the temporal domain allows for a straightforward emulation of the forward temporal masking. This, combined with an efficient nonuniform sub-band decomposition and application of noise shaping in spectral domain instead of temporal domain (a technique to suppress artifacts in tonal audio signals), yields a codec that does not rely on the linear speech production model but rather uses well-accepted concept of frequency-selective auditory perception. As such, the codec is not only specific for coding speech but also well suited for coding other important acoustic signals such as music and mixed content. The quality of the proposed codec at 66 kbps is evaluated using objective and subjective quality assessments. The evaluation indicates competitive performance with the MPEG codecs operating at similar bit rates.

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Section: Spectral Noise Shaping (Sns)mentioning

confidence: 99%