Perceptually Motivated Sub-band Decomposition for FDLP Audio Coding

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

doi:10.1007/978-3-540-87391-4_56

Cited by 2 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each frame is decomposed using a 6 stage tree-structured uniform QMF analysis to provide 64 uniformly spaced sub-bands. A non-uniform QMF decomposition into 32 frequency sub-bands is obtained by merging these 64 uniform QMF sub-bands [26]. This sub-band decomposition is motivated by critical band decomposition in the human auditory system.…”

Section: A Non-uniform Sub-band Decompositionmentioning

confidence: 99%

Autoregressive Models of Amplitude Modulations in Audio Compression

Ganapathy

Motlíček

Heřmanský

2010

IEEE Trans. Audio Speech Lang. Process.

Self Cite

View full text Add to dashboard Cite

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. Index TermsSpeech and Audio coding, Modulation Spectrum, Frequency Domain Linear Prediction (FDLP), Objective and subjective evaluation of audio quality.

show abstract

Section: A Non-uniform Sub-band Decompositionmentioning

confidence: 99%

Autoregressive Models of Amplitude Modulations in Audio Compression

Ganapathy

Motlíček

Heřmanský

2010

IEEE Trans. Audio Speech Lang. Process.

Self Cite

View full text Add to dashboard Cite

show abstract

“…An initial decomposition with a 6 stage treestructured uniform QMF analysis gives 64 uniformly spaced sub-bands. A nonuniform QMF decomposition into 32 frequency sub-bands is obtained by merging these 64 uniform QMF sub-bands [30]. This tying operation is motivated by critical band decomposition in the human auditory system.…”

Section: Nonuniform Sub-band Decompositionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Perceptually Motivated Sub-band Decomposition for FDLP Audio Coding

Cited by 2 publications

References 7 publications

Autoregressive Models of Amplitude Modulations in Audio Compression

Autoregressive Models of Amplitude Modulations in Audio Compression

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

Contact Info

Product

Resources

About