Venkatraman Atti — accepted AI-conference papers

2015

Improved error resilience for volte and VoIP with 3GPP EVS channel aware coding

Venkatraman Atti, Daniel J. Sinder, Shaminda Subasingha, Vivek Rajendran, Duminda A. Dewasurendra, Venkata Chebiyyam +6

ICASSP 2015accepted

A highly error resilient mode of the newly standardized 3GPP EVS speech codec is described. Compared to the AMR-WB codec and other conversational codecs, the EVS channel aware mode offers significantly improved error resilience in voice communication over packet-switched networks such as Voice-over-…

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2015

Linear prediction based comfort noise generation in the EVS codec

Zhe Wang, Lei Miao, Jon Gibbs, Tomas Toftgard, Martin Sehlstedt, Stefan Bruhn +3

ICASSP 2015accepted

A Discontinuous transmission (DTX) system, which is widely adopted in speech codecs, is an important function for speech communication systems that can reduce the transmission bandwidth by at least a half. Within a DTX system, the comfort noise generation (CNG) plays a key role in the overall qualit…

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2015

Low bit rate high-quality MDCT audio coding of the 3GPP EVS standard

Srikanth Nagisetty, Zongxian Liu, Takuya Kawashima, Hiroyuki Ehara, Xuan Zhou, Bin Wang +9

ICASSP 2015accepted

This paper presents a low bit-rate MDCT coder, which is adopted as a part of the recently standardized codec for Enhanced Voice Services. To maximize codec performance for NB to SWB input signals for low bit-rates (7.2 to 16.4 kbps), new adaptive bit-allocation and spectrum quantization schemes, whi…

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2015

Overview of the EVS codec architecture

Martin Dietz, Markus Multrus, Vaclav Eksler, Vladimir Malenovsky, Erik Norvell, Harald Pobloth +15

ICASSP 2015accepted

The recently standardized 3GPP codec for Enhanced Voice Services (EVS) offers new features and improvements for low-delay real-time communication systems. Based on a novel, switched low-delay speech/audio codec, the EVS codec contains various tools for better compression efficiency and higher qualit…

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2015

Super-wideband bandwidth extension for speech in the 3GPP EVS codec

Venkatraman Atti, Venkatesh Krishnan, Duminda A. Dewasurendra, Venkata Chebiyyam, Shaminda Subasingha, Daniel J. Sinder +6

ICASSP 2015accepted

This paper describes the time-domain bandwidth extension (TBE) framework employed to code wideband and super-wideband speech in the newly standardized 3GPP EVS codec. The TBE algorithm uses a nonlinear harmonic modeling technique that incorporates principles of time-domain envelope-modulated noise m…

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2015

Two-stage speech/music classifier with decision smoothing and sharpening in the EVS codec

Vladimir Malenovsky, Tommy Vaillancourt, Wang Zhe, Kihyun Choo, Venkatraman Atti

ICASSP 2015accepted

In most internationally recognized standardized multi-mode codecs, signal classification is performed in a single step by either linear discrimination or SNR-based metrics. The speech/music classifier of the EVS codec achieves greater discrimination than these single-step models by combining Gaussia…

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