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Speex: A Free Codec For Free Speech Open
The Speex project has been started in 2002 to address the need for a free, open-source speech codec. Speex is based on the Code Excited Linear Prediction (CELP) algorithm and, unlike the previously existing Vorbis codec, is optimised for t…
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RSS-based respiratory rate monitoring using periodic Gaussian processes and Kalman filtering Open
In this paper, we propose a method for respiratory rate estimation based on the received signal strength of narrowband radio frequency transceivers. We employ a state-space formulation of periodic Gaussian processes to model the observed v…
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A dynamic rate adaptation algorithm using WB E-model for voice traffic over LTE network Open
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A scalable speech coding scheme using compressive sensing and orthogonal mapping based vector quantization Open
A novel scalable speech coding scheme based on Compressive Sensing (CS), which can operate at bit rates from 3.275 to 7.275 kbps is designed and implemented in this paper. The CS based speech coding offers the benefit of combined compressi…
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A Real-Time Wideband Neural Vocoder at 1.6kb/s Using LPCNet Open
Neural speech synthesis algorithms are a promising new approach for coding speech at very low bitrate. They have so far demonstrated quality that far exceeds traditional vocoders, at the cost of very high complexity. In this work, we prese…
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DeepVoCoder: A CNN Model for Compression and Coding of Narrow Band Speech Open
This paper proposes a convolutional neural network (CNN)-based encoder model to compress and code speech signal directly from raw input speech. Although the model can synthesize wideband speech by implicit bandwidth extension, narrowband i…
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Low Bit-Rate Speech Codec Based on a Long-Term Harmonic Plus Noise Model Open
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Speech Bandwidth Extension with Wavenet Open
Large-scale mobile communication systems tend to contain legacy transmission channels with narrowband bottlenecks, resulting in characteristic "telephone-quality" audio. While higher quality codecs exist, due to the scale and heterogeneity…
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Full-rate Space-time Block Code for Four Transmit Antennas with Linear Decoding Open
This paper proposes a new full-rate space-time block code for MIMO systems at four transmit antennas, which aims at minimizing the bit error rate with low-complexity decoding using ZF and MMSE linear detection techniques in Rayleigh fading…
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An Enhanced Interleaving Frame Loss Concealment Method for Voice Over IP Network Services Open
This paper focuses on AMR WB G.722.2 speech codec, and discusses the unused\nbandwidth resources of the senders by using a Word16(16 bit) to encode the sent\nframes. A packet loss concealment (PLC) method for G.722.2 speech codec is\npropo…
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Towards Higher Spectral Efficiency: Rate-2 Full-Diversity Complex Space-Time Block Codes Open
The upcoming 5G networks demand high-speed and high spectral-efficiency communications to keep up with the proliferating traffic demands. To this end, Massive multiple-input multiple-output (MIMO) techniques have gained significant tractio…
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Matrix Quantization and LPC Vocoder Based Linear Predictive for Low-Resource Speech Recognition system Open
Over the last ten years, there has been significant progress in the use of low-rate speech coders in voice applications for computers, military communications, and civil communications. This advancement has been made possible by the develo…
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Impact of Jitter and Packet loss on Enhanced Voice Serviced for Voice over NR Open
The EVS (Enhanced Voice Service) as a promising speech coding technology aims to provides better voice quality and compression efficiency to deal with the challenge from Voice-over-IP and Over-The-Top voice services. To achieve better expe…
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Space Time Coding Techniques in MIMO: A Review Open
This paper explore the basic approaches used for of space-time coding technique. The emerging field of wireless evaluation such as Multiple Input Multiple Output (MIMO) and Antenna diversity plays an important role in space-time code desig…
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Application-Layer Redundancy for the EVS Codec Open
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Low Bit-Rate Wideband Speech Coding: A Deep Generative Model based Approach Open
Traditional low bit-rate speech coding approach only handles narrowband speech at 8kHz, which limits further improvements in speech quality. Motivated by recent successful exploration of deep learning methods for image and speech compressi…
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Improvement of the post-processing algorithm in AMR-NB speech codec Open
Narrow band adaptive multi-rate (AMR-NB) is a speech codec that supports multiple bit-rate modes and is widely used in mobile communication systems. However, the synthesized speech quality of its lower bit-rate modes is not very satisfying…
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BER Assessment of Conventional QOSTBC3, RARQOSTBC3 and Taha3 Space-Time Coding Techniques over Diverse Channels Open
Even with the presence of complex entities in their code structure, Conventional Quasi-Orthogonal Space-Time Block Codes (QO-STBC) can accomplish the goal of obtaining full rate but with the drawback of higher decoding complexity and less …
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HIGH QUALITY LOW BITRATE VOICE CODEC FOR TRANSMISSION OVER ADVANCED LTE Open
In mobile communication systems bit-rate reductions while maintaining an acceptable voice quality are necessary to achieve efficiency in channel bandwidth utilization and users satisfaction. As Long-Term Evolution(LTE) converging towards a…
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A Cyclotomic Lattice Based Closed Loop QOSTBC for Four Transmit Antennas Open
Drawback of the Space Time Block Code (STBC) is, for complex constellations, full rate and full diversity design exist only for two transmit antennas. In this paper, we propose a novel closed loop Quasi Orthogonal Space Time Block Code (QO…
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Adaptive variable bit-rate speech coder for wireless applications Open
In wireless communication, speech is an essential service for which low rate speech coding is a key technique. Reducing the transmission bandwith and achieving higher speech quality are primary concerns in developing new speech coding algo…
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L2-orthogonal Space-Time Code Design for Continuous Phase Modulation Open
Orthogonal Space-Time block codes (STBC) have been a popular way to implement wireless communications systems with full diversity and simple decoupled maximumlikelihood decoding. However, all these codes rely on pointwise orthogonality whi…