ITU-T coders for wideband, superwideband, and fullband speech communication [Series Editorial

Cox, R.V.; Neto, Simao Ferraz De Campos; Lamblin, C.; Sherif, Mostafa Hashem

doi:10.1109/mcom.2009.5273816

Cited by 27 publications

(18 citation statements)

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“…Thus, some approaches have been proposed for low delay audio codec such as in [118][119]. It is also interesting to look at approaches based on speech coding, such as in [110][111][112][113][114][115][116][117][118][119][120][121][122][123][124][125], to extend their capability to have full audio band and multichannel speech codec.…”

Section: Future Directionmentioning

confidence: 99%

Reviews on Technology and Standard of Spatial Audio Coding

Elfitri

Luthfi²

2017

JNTE

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Abstract-Market demands on a more impressive entertainment media have motivated for delivery of three dimensional (3D) audio content to home consumers through Ultra High Definition TV (UHDTV), the next generation of TV broadcasting, where spatial audio coding plays fundamental role. This paper reviews fundamental concept on spatial audio coding which includes technology, standard, and application. Basic principle of object-based audio reproduction system will also be elaborated, compared to the traditional channel-based system, to provide good understanding on this popular interactive audio reproduction system which gives end users flexibility to render their own preferred audio composition.

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Section: Future Directionmentioning

confidence: 99%

Reviews on Technology and Standard of Spatial Audio Coding

Elfitri

Luthfi²

2017

JNTE

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“…A. Speech Coding 1) G.711: International standards for narrowband digital speech coding based on the venerable A-law and µ-law logarithmic companding algorithms date back to ITU-T Recommendation G.711 (1972) [8], [9], which was widely deployed in public switched telephone network (PSTN) systems. The G.711 encoder ingests 3.4 KHz of audio bandwidth digitized at 8 kilosamples per second (Ksps) with 13-or 14-bit amplitude quantization.…”

Section: Background On Multirate Filter Banks In Digital Coding Smentioning

confidence: 99%

“…Each filter in P 0 is mapped isomorphically to a corresponding upper triangular lifting matrix υ(S(z)) in a multiplicative but abelian (commutative) matrix group U ≡ υ(P 0 ), making U ∼ = P 0 [5, Section III-A]. Similarly, lower triangular lifting matrices satisfying (8) have lifting filters that are half-sample symmetric about −1/2 and belong to…”

Section: B Notation and Terminologymentioning

confidence: 99%

Group-Theoretic Structure of Linear Phase Multirate Filter Banks

Brislawn

2013

IEEE Trans. Inform. Theory

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Unique lifting factorization results for group lifting structures are used to characterize the grouptheoretic structure of two-channel linear phase FIR perfect reconstruction filter bank groups. For Dinvariant, order-increasing group lifting structures, it is shown that the associated lifting cascade group C is isomorphic to the free product of the upper and lower triangular lifting matrix groups. Under the same hypotheses, the associated scaled lifting group S is the semidirect product of C by the diagonal gain scaling matrix group D. These results apply to the group lifting structures for the two principal classes of linear phase perfect reconstruction filter banks, the whole-and half-sample symmetric classes. Since the unimodular whole-sample symmetric class forms a group, W, that is in fact equal to its own scaled lifting group, W = S W , the results of this paper characterize the group-theoretic structure of W up to isomorphism. Although the half-sample symmetric class H does not form a group, it can be partitioned into cosets of its lifting cascade group, C H , or, alternatively, into cosets of its scaled lifting group, S H . Homomorphic comparisons reveal that scaled lifting groups covered by the results in this paper have a structure analogous to a "noncommutative vector space."

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“…I N THE last decade there has been a trend to extend the bandwidth used in speech coding standards from the classical 3.5 kHz narrowband (NB) via 7 kHz wideband (WB) to 14 kHz super wideband (SWB) and >20 kHz fullband (FB) [1]- [5]. Recent studies show the relevance of this trend [6].…”

Section: Introductionmentioning

confidence: 99%