A high-quality multirate real-time CELP coder

Kroon, P.; Swaminathan, K.

doi:10.1109/49.138989

Cited by 22 publications

(4 citation statements)

References 12 publications

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“…The idea of using more than one filter tap (i.e., in equation (2)) was originally conceived to approximate fractional delay [23], but has been found to have broader impact in [24]. Techniques for reducing complexity of parameter estimation have been studied in [25] and [26]. For a review of speech coding work in modeling periodicity, see [27].…”

Section: Long Term Predictionmentioning

confidence: 99%

“…The prediction residue is calculated as . A per subband one bit flag, , is used to selectively enable CLTP, and this flag is set whenever the prediction residue energy is lower than the signal energy in the band: if otherwise (25) The actual input to the quantization module, in each subband , is denoted as, if otherwise (26) These samples are now quantized adaptively in each block and sent to the decoder, along with the side information of the quantization step sizes , the number of periodic components , and the flags . An illustration of integrating CLTP with a generic audio coder is provided in Fig.…”

Section: B Integration With Bluetooth Sbcmentioning

confidence: 99%

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Cascaded Long Term Prediction for Enhanced Compression of Polyphonic Audio Signals

Nanjundaswamy

Rose

2014

IEEE/ACM Trans. Audio Speech Lang. Process.

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Abstract-Audio compression systems exploit periodicity in signals to remove inter-frame redundancies via the long term prediction (LTP) tool. This simple tool capitalizes on the periodic component of the waveform by selecting a past segment as the basis for prediction of the current frame. However, most audio signals are polyphonic in nature, containing a mixture of several periodic components. While such polyphonic signals may themselves be periodic with overall period equaling the least common multiple of the individual component periods, the signal rarely remains sufficiently stationary over the extended period, rendering the LTP tool suboptimal. Instead of seeking a past segment that represents a "compromise" for incompatible component periods, we propose a more complex filter that predicts every periodic component of the signal from its immediate history, and this is achieved by cascading LTP filters, each corresponding to individual periodic component. We also propose a recursive "divide and conquer" technique to estimate parameters of all the LTP filters. We then demonstrate the effectiveness of cascaded LTP in two distinct settings of the ultra low delay Bluetooth Subband Codec and the MPEG Advanced Audio Coding (AAC) standard. In MPEG AAC, we specifically adapt the cascaded LTP parameter estimation to take into account the perceptual distortion criteria, and also propose a low decoder complexity variant. Objective and subjective results for all the settings validate the effectiveness of the proposal on a variety of polyphonic signals.

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Section: Long Term Predictionmentioning

confidence: 99%

Section: B Integration With Bluetooth Sbcmentioning

confidence: 99%

Cascaded Long Term Prediction for Enhanced Compression of Polyphonic Audio Signals

Nanjundaswamy

Rose

2014

IEEE/ACM Trans. Audio Speech Lang. Process.

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“…speech parameters) and the channel protection. In an early work [101] a multi-rate CELP codec was described, which operated at bit rates between 4.8 ad 8 kb/s. A new standardization work has been started at ETSI to design an adaptive multi-rate coding scheme, which should be completed (for the speech coding scheme itself) at the end of 1998, although some uncertainty remains on the feasibility of this scheme.…”

Section: Itu-t Denotes the Telecommunications Standardizationmentioning

confidence: 99%

Innovative speech processing for mobile terminals: an annotated bibliography

et al. 2000

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This paper gives an overview of recent bibliographic references dealing with speech processing in mobile terminals. Its purpose is to point out state of the art issues in the area; thus a fairly large list of references taken from many conferences proceedings and journals is given and commented. General considerations about speech processing in mobile communications are "rstly introduced; then we deal with audio processing for speech enhancement in mobile terminals and with low bit-rate speech coding. Speech recognition is addressed with some accent put on mobile applications. A short overview of implementation aspects of speech processing algorithms in mobile terminals is also given. Finally, open issues and problems are listed.2000 Published by Elsevier Science B.V. All rights reserved. ZusammenfassungDiese Arbeit gibt einen U G berblick auf neue bibliogra"sche Referenzen, die sich mit der Sprachverarbeitung in mobilen Einheiuten beschaK ftigen. Unser Ziel ist es, den Stand der technischen VeroK !entlichungen auf diesem Gebiet zu ermitteln; somit ist eine recht lange Liste von Referenzen aus vielen Konferenzen und Zeitschiften und die zugehoK rigen Kommentare angegeben. Allgemeine U G berlegungen zur Sprachverarbeitung in der Mobilkommunikation werden als erstes angefuK hrt; anschlie{end behandeln wir Verfahren zur Spracheverbesserung in mobilen Systemen basierend auf niedrigen Bitraten. Bei der anschlieend behandelten Spracherkennung wird ein gewisser Schwerpunkt auf mobile Systeme gelegt. Ein kurzer U G berblick zum Implementierungsaspekt der Sparchverarbeitungsverfahren in mobilen EndgeraK ten ist ebenfalls angegeben. Schlielich werden o!ene Themen und Probleme aufgezeigt.2000 Published by Elsevier Science B.V. All rights reserved. Re2 sume2Cet article passe en revue la bibliographie reH cente concernant le traitement de la parole dans les terminaux mobiles. Son objectif est de mettre l'accent sur l'eH tat de l'art dans le domaine; en conseH quence une importante liste de reH feH rences recueillies dans des actes de congre`s et des revues est donneH e et commenteH e. En premier lieu, des consideH rations geH neH rales sur le traitement de la parole dans les communications mobiles sont preH senteH es; puis nous discutons de traitements de rehaussement de la parole dans les terminaux mobiles ainsi que du codage de la parole a`bas deH bits. La reconnaissance vocale est traiteH e avec un accent particulier mis sur les applications mobiles. L'implantation des algorithmes de traitement de la parole dans les terminaux mobiles est aussi brie`vement traiteH e. En"n, certaines questions et proble`mes ouverts sont citeH s.

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“…The processes of software simulation can also be applied for porting such coder algorithm to the fixed-point DSP chip. It's more an art than science for transforming a floating-point program into fixed-point one [9]. The procedure of implementing the fixed-point program will be described as follows:…”

Section: The Circuit Design and Implementationmentioning

confidence: 99%

A programmable application-specific VLSI architecture and implementation for speech word-recognizer

Suen

Wang

Wang³

Proceedings of ASP-DAC '97: Asia and South Pacific Design Automation Conference

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In this paper, the efficient and flexible VLSI architecture and implementation for the voice word-recognizer processor are presented. In order to achieve a flexible and efficient VLSI realization, we use a programmable with specific core design strategy which incorporates the lbest aspects of both programmable and application specific signal processors to achieve high speed, high accuracy, and efficient hardware realization for the word-recognizer. On the whole, the single chip is fabricated in 0.8 M m double-metal CMOS technology after the physical design and circuit verification. The chip can process 40 MHz sampled data and it contains about 70000 transistors which occupy 0.62.xO 60 cm2 area.

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A high-quality multirate real-time CELP coder

Cited by 22 publications

References 12 publications

Cascaded Long Term Prediction for Enhanced Compression of Polyphonic Audio Signals

Cascaded Long Term Prediction for Enhanced Compression of Polyphonic Audio Signals

Innovative speech processing for mobile terminals: an annotated bibliography

A programmable application-specific VLSI architecture and implementation for speech word-recognizer

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