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Lee, Jong‐Hwan; Lee, Te-Won; Jung, Ho‐Young; Lee, Sang Yup

doi:10.1023/a:1015777200976

Cited by 33 publications

(5 citation statements)

References 12 publications

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“…A more precise mathematical argument in favor of Gabor filters is that they offer the most sparse patterns for cross Wigner-Ville distributions [21]. This choice is also consistent with the filter shapes found empirically with ICA [9,11,18]. The equation of a Gabor filter is:…”

Section: Gabor Dictionaries and Interpretations Of The β Parametersupporting

confidence: 56%

“…The Laplace distribution encourages the sparsity of decomposition coefficients, as most of the values of Y i are around zero under this prior. It has been used multiple times for ICA applied to speech [9,17]. Under this prior, the entropy terms in the sum ∑ i H(Y i ) can be replaced by cross-entropy terms, yielding the following approximation:…”

Section: Plos Onementioning

confidence: 99%

“…Sparse coding is similar to Independent Component Analysis when the independent components are associated with sparse activations, and algorithms of sparse coding have been used to investigate the structure of sensory signals as well [8,9]. The efficient coding approach initiated numerous studies on the properties of the visual system [10], and is also the basis for comparable studies on the auditory system, whether on peripheral processing [9,11,12], or more recently on higher level processing (e.g. modulation filters) [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…When ICA is applied to speech data, it produces a bank of filters that resemble Gabor filters-i.e. Gaussian modulated sinusoids [9,11,18], whose frequency selectivity is related to center frequency by a power law [11]. Recent analyses took advantage of this fact and used one parameter, the regression slope of the quality factor Q 10 on center frequency f c -on a logarithmic scale-to discriminate between representations learned from different speech data [17,19].…”

Section: Introductionmentioning

confidence: 99%

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Fine-grained statistical structure of speech

Deloche

2020

PLoS ONE

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In spite of its acoustic diversity, the speech signal presents statistical regularities that can be exploited by biological or artificial systems for efficient coding. Independent Component Analysis (ICA) revealed that on small time scales (* 10 ms), the overall structure of speech is well captured by a time-frequency representation whose frequency selectivity follows the same power law in the high frequency range 1-8 kHz as cochlear frequency selectivity in mammals. Variations in the power-law exponent, i.e. different time-frequency trade-offs, have been shown to provide additional adaptation to phonetic categories. Here, we adopt a parametric approach to investigate the variations of the exponent at a finer level of speech. The estimation procedure is based on a measure that reflects the sparsity of decompositions in a set of Gabor dictionaries whose atoms are Gaussian-modulated sinusoids. We examine the variations of the exponent associated with the best decomposition, first at the level of phonemes, then at an intra-phonemic level. We show that this analysis offers a rich interpretation of the fine-grained statistical structure of speech, and that the exponent values can be related to key acoustic properties. Two main results are: i) for plosives, the exponent is lowered by the release bursts, concealing higher values during the opening phases; ii) for vowels, the exponent is bound to formant bandwidths and decreases with the degree of acoustic radiation at the lips. This work further suggests that an efficient coding strategy is to reduce frequency selectivity with sound intensity level, congruent with the nonlinear behavior of cochlear filtering.

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Section: Gabor Dictionaries and Interpretations Of The β Parametersupporting

confidence: 56%

Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fine-grained statistical structure of speech

Deloche

2020

PLoS ONE

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“…Gonad Bulu babi T.gratilla dapat dikonsumsi secara langsung maupun diolah. Lee et al, (1982), melaporkan bahwa dari analisa protein ternyata Bulu babi T.gratilla mempunyai sekitar 28 asam amino yang sangat penting untuk pertumbuhan dan kesehatan manusia. Selain itu, gonad Bulu babi kaya akan Vitamin B kompleks, Vitamin A, dan mineral (Kato et al,.…”

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Keragaman Genetik Bulu Babi Tripneutes Gratilla (Linnaeus, 1758) Di Perairan Pantai Desa Lambakara, Sumba Timur, Nusa Tenggara Timur (Ntt)

Nomleni,

Turnip,

Adin Afandi

2022

JAJ

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A total of 14 samples were taken from the coastal waters of East Sumba. The sample was isolated from genomic DNA using the KIT GENE AID method using GO TAQ Green PCR Mix material and universal primer pairs LCO1490 and HCO2198 to determine the expression of the amplified COI gene (PCR). The PCR results were sent to First Base CO (Malaysia) for sequencing. The sequence length of the COI gene sequencing of the genus Tripneustes from NTT waters using universal primers LCO1490 and HCO2198 was 690-700 bp. The results showed that the genetic diversity of the sea urchin population in the coastal waters of Sumba was 0.83516 while the value of nucleotide diversity was 0.00516. The total genetic distance ranged from 0.000-0.010. All population genetic distances are still relatively low because genetic distances less than 0.010-0.099 are included in the low category. This close genetic distance causes connectivity between the two populations because there is gene flow. Based on the phylogenetic analysis, it was found that the populations in Sumba waters and some areas (outgroups) were genetically close

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