Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 51 for “"Codec"”.
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Companding techniques for high dynamic range audio CODEC receiver path
In this thesis, an audio CODEC receiver path has been modified by the addition of companding techniques. Companding compresses the input signal and expands the output signal according to the input power strength such that additional noise from the system is suppressed while the signal content is …
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The design, implementation and analysis of a wavelet-based video codec
… motion estimation techniques. The proposed codec processes a sequence of images in a group of frames (GOF) by first transforming the group spatially and temporally, in order to obtain a GOF of 3D approximation and detail coefficients. The codec uses selective prediction of temporal …
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A Cost Shared Quantization Algorithm and its Implementation for Multi-Standard Video CODECS
… the video encoder and decoder system, known as codec in short, that should support multiple video standards on a single platform. In a modern video codec, quantization is a key unit used for video compression. In this thesis, a generalized quantization algorithm and hardware implementation is …
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A Study of Perceptually Tuned, Wavelet Based, Rate Scalable, Image and Video Compression
… such as Y, Cb, and Cr. Our experimental image codec shows very exciting results in compression performance and visual quality comparing to the new wavelet based international still image compression standard - JPEG 2000. On the other hand, our codec also shows significant better speed …
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Describing functions for information channels subject to packet loss and quantization
… channels. DFs are presented for a general codec algorithm, and for four commonly-used sensor-feedback codecs: Zero-Output, Hold- Output, Linear Filter, and Modified Information Filter. These are each given as closed-form mathematical expressions of the provably optimal gains and phases for …
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Adaptation For Multi-Antenna Systems
… of a limited and predefined set of joint MoDem/CoDec and MIMO configurations over a representative set of channel realizations. Other work has attempted to adapt only the MIMO scheme to varying channel conditions without considering modulation format or the channel code used. Finally, attempts …
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Encodage entropique des indices binaires d'un quantificateur algébrique encastré
… algébrique encastré utilisé par le codec AMR-WB+ pour encoder certaines des trames d'un signal audio. Une étude détaillée des statistiques a été menée dans le but de développer un algorithme efficace de compression et réduire par conséquent la longueur moyenne du code binaire utilisé …
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Implicit Neural Representations for Multimedia Compression [Rappresentazioni neurali implicit per la Compressione di Multimedia]
… fungendo da paradigma alternativo ai codec tradizionali. Sebbene questo approccio sia in fase embrionale, è già stato impiegato con successo per codificare diverse modalità di dati e ha recentemente guadagnato l'attenzione della comunità di ricerca. In questa tesi, proponiamo una …
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"""Travelling Without Moving"": A Study on the Reconstruction, Compression, and Rendering of Three-Dimensional Environments for Telepresence"
… values per pixel. Second, we introduce a novel codec for the static depth-image-based representation, which jointly estimates and encodes the unknown depth map from multiple views using a novel rate-distortion optimization scheme. Third, we propose a second novel codec for the static …
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SCALABLE BUS ENCODING FOR ERROR-RESILIENT HIGH-SPEED ON-CHIP COMMUNICATION
… on-chip code word generation. The proposed CODEC implementation strategy uses a structured graph to model the recursive nature of an encoding technique that facilitates scalable CODEC implementation. The non-enumerative nature of the implementation strategy makes it highly scalable. The …
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Adaptive format conversion information as enhancement data for scalable video coding
… for scalable video compression. A new scalable codec is developed in this thesis that can utilize adaptive format conversion information and/or residual coding information as enhancement data. This codec was used in various simulations to investigate different aspects of adaptive format …
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Intelligent Knowledge Distribution for Multi-Agent Communication, Planning, and Learning
… POMDPs (CA-POMDP) and concurrent decentralized (CoDec) POMDPs for an agnostic plug-and-play capability for fully autonomous systems. Each agent runs a CoDec POMDP where all the decision making (motion planning, task allocation, asset monitoring, and communication) are separated into concurrent …
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Neural Region-of-Interest-Aware Video Compression for Wildlife Monitoring Under Edge Computing Constraints
… controlled study, the released DCVC-RT neural codec configuration reduced the transmitted archives from 399.16 MB of source video to 10.36 MB across the 20 held-out clips, corresponding to a 97.40% reduction in transmitted archive size, while preserving the animal region more faithfully than …
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GRACE -Os: An Energy -Efficient Mobile Multimedia Operating System
… adaptive Athlon processor and adaptive video codec applications. Our experimental results show that GRACE-OS efficiently trades off QoS for energy with acceptable overhead. In particular, compared to previous systems that adapt only some system layers, GRACE-OS achieves the user-desired …
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Video coding with adaptive vector quantization and rate distortion optimization
… we present an adaptive vector quantization based codec that is able to encode and decode in real-time using current PC technology. This codec is rate-distortion optimized and adaptive vector quantization is applied in <br>the wavelet transform domain. The organization of the wavelet coefficients …
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Delta modulation techniques for low bit-rate digital speech encoding
… both objective and subjective, of these hybrid codecs has been carried out. Results show that overall the two codecs developed as part of this project are better than the HCDM codec. In addition the new codecs offer simpler implementation in digital hardware than the HCDM. A Computer Aided Test …
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Wireless speech and audio communications
… MultiRate WideBand (AMR-WB) audio/speech codecs were incorporated in the sophisticated UEP turbo transceiver, which consisted of a three-stage serially concatenated scheme constituted by Space-Time Trellis Coding (STTC), Trellis Coded Modulation (TCM) and two different-rate Non-Systematic …
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A psychoacoustically motivated speech enhancement system
… was preferred over the Enhanced Variable Rate Codec (EVRC) noise suppression algorithm in 88% of the cases. Informal listening tests showed preferable speech quality than Gustafsson's algorithm. As a front end to a vocoder, the new system was preferred over the other two by all the test …
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