Error Resilient Speech Coding Using Sub-band Hilbert Envelopes

Ganapathy, Sriram; Motlíček, Petr; Heřmanský, Hynek

doi:10.1007/978-3-642-04208-9_49

Cited by 1 publication

(1 citation statement)

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“…The drop-out of bit-packets in the proposed codec corresponds to loss of sub-band signals at the decoder. In [47], it has been shown that the degraded sub-band signals can be efficiently recovered from the adjacent sub-bands in time-frequency plane which are unaffected by the channel.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%