Flexible design of computationaly efficient nearly perfect QMF filter banks

Picel, Zdenek

doi:10.1109/icassp.1985.1168361

Cited by 38 publications

(7 citation statements)

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“…Cosine modulation of a lowpass prototype filter has been used since the early eighties [61,62,63,64,65] to realize parallel M-channel filter banks with nearly perfect reconstruction. Because they do not achieve perfect reconstruction, these filter banks are known collectively as "psuedo QMF," and they are characterized by several attractive properties…”

Section: B Cosine Modulated "Psuedo Qmf" M-band Banksmentioning

confidence: 99%

Perceptual coding of digital audio

2000

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I. INTRODUCTIONAudio coding or audio compression algorithms are used to obtain compact digital representations of high-fidelity (wideband) audio signals for the purpose of efficient transmission or storage. The central objective in audio coding is to represent the signal with a minimum number of bits while achieving transparent signal reproduction, i.e., generating output audio that cannot be distinguished from the original input, even by a sensitive listener ("golden ears"). This paper gives a review of algorithms for transparent coding of high-fidelity audio.The introduction of the compact disk (CD) in the early eighties [1] brought to the fore all of the advantages of digital audio representation, including unprecedented high-fidelity, dynamic range, and robustness. These advantages, however, came at the expense of high data rates. Conventional CD and digital audio tape (DAT) systems are typically sampled at either 44.1 or 48 kilohertz (kHz) using pulse code modulation (PCM) with a sixteen bit sample resolution. This results in uncompressed data rates of 705.6/768 kilobits per second (kbps) for a monaural channel, or 1.41/1.54 megabits per second (Mbps) for a stereo pair at 44.1/48 kHz, respectively. Although high, these data rates were accommodated successfully in first generation digital audio applications such as CD and DAT. Unfortunately, second generation multimedia applications and wireless systems in particular are often subject to bandwidth and cost constraints that are incompatible with high data rates. Because of the success enjoyed by the first generation, however, end users have come to expect "CD-quality" audio reproduction from any digital system. Therefore, new network and wireless multimedia digital audio systems must reduce data rates without compromising reproduction quality. These and other considerations have motivated considerable research during the last decade towards formulation of compression schemes that can satisfy simultaneously the conflicting demands of high compression ratios and transparent reproduction quality for high-fidelity audio signals

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Section: B Cosine Modulated "Psuedo Qmf" M-band Banksmentioning

confidence: 99%

Perceptual coding of digital audio

2000

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“…Beispielsweisc mª bei einer 80-Kanal-Filterbank mit FIR-Filtern 2 der L~inge L = 800 ira Fall der cosinusf6rmig modulierten Filterbank nur 800 statt 64 000 Filterkoeffizienten mit dem Entwurfsverfahren bestimmt werden. AuBerdem gibt es effiziente Implementierungsm6glichkeiten, bei denen nur die Impulsantwort des Prototypfilters gespeichert werden mus [4,6,7,11]. Um das Entwurfsverfahren zu erl~iutem, gehen wir vom Amplitudenfrequenzgang (genaugenommen von der Nullphasenkomponente) des linearphasigen Prototypfilters aus: [5,10], aber sehr einfach auf Mehrkanalfilterb~inke erweitert werden kann [13,14].…”

Section: Entwurf ~Iquidistanter Filterbiinkeunclassified

Entwurf modulierter digitaler Filterbänke

Doblinger

1998

Elektrotech. Inftech.

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Es wird ein verbessertes Entwurfsverfahren fª modulierte MultiratenfilterNinke vorgestellt, mit dem sowohl Filterb~inke mit ~iquidistanter Frequenzbandaufteilung, als auch solche mit nicht~iquidistanter Bandaufteilung entworfen werden k6nnen. Verglichen mit anderen Methoden konvergiert das neue Verfahren wesentlich rascher und liefert speziell fª Anwendungen ira Bereich der Audiosignalverarbeitung exzellente Prototypfilter. Das Optimierungsverfahren ben6tigt keine der ª cherweise verwendeten nichtlinearen Optimierungsalgorithmen, sondem lediglich Routinen zum L6sen linearer Gleichungssysteme. Als Beispiel wird der Entwurf einer Filterbank zur geh6rm~igig angepagten Filterbankanalyse und -synthese pr~i-sentiert. SchlªDigitale Signalverarbeitung; Mehrfachtaktverarbeitung; Digitale Filter; FilterNinke; Critical-band Analysis/Synthesis Modulated digitalfiIter bank design. In this paper, we presentan improved design method for multirate modulated ¡ banks with uniform or nonuniform frequency spacing. Compared to other design techniques, our method converges very rapidly and allows for the design of excellent prototype filters, especially for audio signal processing applications. The optimization procedure avoids nonlinear function minimization and requires linear equation solving only. We demonstrate our method by a design example of filter banks for critical-band analysis/synthesis.

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“…The quadrature mirror filters [20], [21] [23] are often used for systems with two bands. For an arbitrary number of channels, the matrix formalism [15], lossless structures [22] and modulated filter banks [12], [24] - [27] have been introduced. The main problem in transmultiplexers which is due to the leakage of signal from one channel to another in the TDM to FDM (and vice versa) conversion is known as the crosstalk [18].…”

Section: Introductionmentioning

confidence: 99%

FRFT Based Transmultiplexers

Aggrey

Tao

2007

2007 Third International IEEE Conference on Signal-Image Technologies and Internet-Based System

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Transmultiplexers, the basis of which is filter banks, have been successfully utilized for multiuser communications. One important limitation however, is the leakage of signal from one channel to another known as crosstalk. This occurs because the core elements, synthesis and analysis filters employed are nonideal. To minimize its effect has been the focus of transmultiplexer design. This study therefore investigates a new approach to transmultiplexer design using the FRFT based filter banks in the processing of nonstationary signals. This method can enhance the elimination of the crosstalk and amplitude distortion.

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Flexible design of computationaly efficient nearly perfect QMF filter banks

Cited by 38 publications

References 4 publications

Perceptual coding of digital audio

Perceptual coding of digital audio

Entwurf modulierter digitaler Filterbänke

FRFT Based Transmultiplexers

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