10,052 resources related to Codecs
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2020 IEEE 17th Annual Consumer Communications & Networking Conference (CCNC)
IEEE CCNC 2020 will present the latest developments and technical solutions in the areas of home networking, consumer networking, enabling technologies (such as middleware) and novel applications and services. The conference will include a peer-reviewed program of technical sessions, special sessions, business application sessions, tutorials, and demonstration sessions.
The International Conference on Consumer Electronics (ICCE) is soliciting technical papersfor oral and poster presentation at ICCE 2018. ICCE has a strong conference history coupledwith a tradition of attracting leading authors and delegates from around the world.Papers reporting new developments in all areas of consumer electronics are invited. Topics around the major theme will be the content ofspecial sessions and tutorials.
IEEE INFOCOM solicits research papers describing significant and innovative researchcontributions to the field of computer and data communication networks. We invite submissionson a wide range of research topics, spanning both theoretical and systems research.
IEEE Global Communications Conference (GLOBECOM) is one of the IEEE Communications Society’s two flagship conferences dedicated to driving innovation in nearly every aspect of communications. Each year, more than 2,900 scientific researchers and their management submit proposals for program sessions to be held at the annual conference. After extensive peer review, the best of the proposals are selected for the conference program, which includes technical papers, tutorials, workshops and industry sessions designed specifically to advance technologies, systems and infrastructure that are continuing to reshape the world and provide all users with access to an unprecedented spectrum of high-speed, seamless and cost-effective global telecommunications services.
ISSCC is the foremost global forum for solid-state circuits and systems-on-a-chip. The Conference offers 5 days of technical papers and educational events related to integrated circuits, including analog, digital, data converters, memory, RF, communications, imagers, medical and MEMS ICs.
Speech analysis, synthesis, coding speech recognition, speaker recognition, language modeling, speech production and perception, speech enhancement. In audio, transducers, room acoustics, active sound control, human audition, analysis/synthesis/coding of music, and consumer audio. (8) (IEEE Guide for Authors) The scope for the proposed transactions includes SPEECH PROCESSING - Transmission and storage of Speech signals; speech coding; speech enhancement and noise reduction; ...
Broadcast technology, including devices, equipment, techniques, and systems related to broadcast technology, including the production, distribution, transmission, and propagation aspects.
Video A/D and D/A, display technology, image analysis and processing, video signal characterization and representation, video compression techniques and signal processing, multidimensional filters and transforms, analog video signal processing, neural networks for video applications, nonlinear video signal processing, video storage and retrieval, computer vision, packet video, high-speed real-time circuits, VLSI architecture and implementation for video technology, multiprocessor systems--hardware and software-- ...
Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.
Covers topics in the scope of IEEE Transactions on Communications but in the form of very brief publication (maximum of 6column lengths, including all diagrams and tables.)
2016 IEEE International Conference on Big Data (Big Data), 2016
Modern multidimensional medical imaging technology produces very large amount of data especially from the computed tomography modality. These volumetric dataset opens new demands for big data storage and high-speed communication systems which may be alleviated by image compression techniques. Current image compression schemes adopted in the DICOM standard do not exploit the inter- slice correlation within three-dimensional (3D) dataset. Video ...
IEE Colloquium on Modems and Codecs for Satellite Communications, 1989
Proceedings ELMAR-2012, 2012
The article is analyzing the real impact audio and video streams for teleconferencing services in NGN networks. The test scenario is based on examining the data flow between Asterisk PBX and SIP client. This examination is performed by analysis of the data stream for the Asterisk PBX, depending on the parameters for audio/video stream to the SIP client. These parameters ...
2017 IEEE 7th Annual Computing and Communication Workshop and Conference (CCWC), 2017
The performance and quality of VoIP calls conducted through a Mobile Ad Hoc Network (MANET) having a number of SIP wireless nodes registered on a SIP Proxy are evaluated. The measurement campaign is conducted in an indoor corridor environment at a university campus. The voice codecs used to conduct the calls are G.711, G.727 and G.723.1. These codecs are mainly ...
2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2017
One of the most common yet detrimental compression artifacts in frequency- domain audio codecs is known as pre-echo, which is perceived as a brief noise preceding transient signals, and is discernable even without direct comparison to the original signal. Because of its substantial negative impact on audio quality, many techniques have been proposed to alleviate it, but not without effect ...
Modern multidimensional medical imaging technology produces very large amount of data especially from the computed tomography modality. These volumetric dataset opens new demands for big data storage and high-speed communication systems which may be alleviated by image compression techniques. Current image compression schemes adopted in the DICOM standard do not exploit the inter- slice correlation within three-dimensional (3D) dataset. Video compression may have a potential to improve the compression ratio by reducing the redundancy in volumetric medical images. In this paper, we compare the performance of five lossless video codecs (H264, H265, Lagarith, MSU, MLC) and three still- image codecs (JPEG, JPEG2000, JPEG-LS) using 3D medical computed tomography datasets. Performance evaluation shows that video codecs improve the compression ratio compared to JPEG and JPEG2000 while being competitive to JPEG-LS.
The article is analyzing the real impact audio and video streams for teleconferencing services in NGN networks. The test scenario is based on examining the data flow between Asterisk PBX and SIP client. This examination is performed by analysis of the data stream for the Asterisk PBX, depending on the parameters for audio/video stream to the SIP client. These parameters are represented using different codecs for audio (G.711 a-law, G.711 u-law, G.722, GSM, Speex), and the video (H.263, H.263p, H.264, MP4V-ES) to required bandwidth. The second part is a subjective assessment of quality audio / video stream, depending on network parameters (delay, packet loss rates and bandwidth). The third part of looking at video conferencing is an analysis of CPU usage and RAM consumption, depending on the number of active SIP clients. Above all, however, affect the number of users in a conference room.
The performance and quality of VoIP calls conducted through a Mobile Ad Hoc Network (MANET) having a number of SIP wireless nodes registered on a SIP Proxy are evaluated. The measurement campaign is conducted in an indoor corridor environment at a university campus. The voice codecs used to conduct the calls are G.711, G.727 and G.723.1. These codecs are mainly used in VoIP technologies. The calls' quality is evaluated using four QoS metrics which include the mean opinion score (MOS), jitter, delay, and packet loss. According to the experimental results, voice codec G.711 provides the best performance in this indoor environment.
One of the most common yet detrimental compression artifacts in frequency- domain audio codecs is known as pre-echo, which is perceived as a brief noise preceding transient signals, and is discernable even without direct comparison to the original signal. Because of its substantial negative impact on audio quality, many techniques have been proposed to alleviate it, but not without effect on coding efficiency. This paper presents a novel method to reduce pre- echo noise using only information already available at the decoder, such as scale-factors, that allow an estimation of the quantization noise levels in each frequency band. Doing so allows the proposed method to reduce pre-echo noise based on a precise modeling of the quantization noise spread before the transient signal. This has shown to improve both the subjective and objective quality of the MPEG AAC codec, and requires no modifications to the existent standard-compliant encoders.
This paper presents the ATM-related technical features of the range of ATM based video and audio hardware codecs manufactured by FORE Systems. These devices are stand-alone and attach directly to the ATM network and are thus completely decoupled from any particular hardware and operating systems platform. The devices are managed from a remote workstation or PC. Video and audio sourced from the hardware codecs can be displayed on workstations and PCs. There are separate unidirectional codecs: the AVA-300 for encode, the ATV-300 for decode. Proxy signalling enables the construction of simple, cheap devices which still support full network signalling. The use of native ATM AALS transport provides high performance and low latency data transfer. ATM multicast and QoS support allow video and audio to co-exist with data applications. Motion-JPEG provides TV-quality video at medium data rates. M-JPEG combined with variable-Q allows maximum use to be made to be made of the available bandwidth. Finally, the CellChain reduces costs by allowing multiple devices to share a single switch port.
A conventional video-coding system codes a video sequence at a desired fixed bit rate that is adequate for a given application. Serving different clients requires transcoding of a given sequence. Scalable coding provides a straightforward solution for video coding that can serve a broad range of applications without the need for transcoding. Current international video- coding standards do not provide fully scalable methods. The latest video- coding standard, H.264/Advanced Video Coding (AVC) provides the best rate- distortion (R-D) performance. The motion compensated embedded zero block context (MC-EZBC) coder is a motion compensated temporal filtering (MCTF) type video codec that is fully scalable and provides R-D performance that is comparable to that of MPEG-4 fine granular scalability. The paper compares the performance of the MC-EZBC codec with that of the H.264/AVC video codec. It is observed that the R-D performance of H.264/AVC is superior to that of MC-EZBC for low resolution video sequences and it is comparable in the case of high- resolution sequences in terms of luminance PSNR values, but, as in other cases, the introduction of scalability may degrade the performance of H.264/AVC.
This paper compares SPEEX and OPUS speech codecs for wireless sensor networks (WSN) based speech/voice transmission between two wireless nodes. The characteristics and parameters for both the codecs has been discussed below with their Graphs (Quality versus Bit-rate) based on the listening test conducted by Google. The OPUS codec represents itself the best among other codecs for the transmission of voice over wireless sensor network (WSN) in the current scenario and in coming future.
Current portable devices e.g. cell phones, PDA's and laptops are mainly Wi-Fi capable. Users can make efficient use of these devices by running various applications. Among these, the Voice over Internet Protocol (VoIP) application is very popular. As new models of these devices emerge, they are increasingly power hungry in terms of processing and communication. As a result, battery lifetime is one of the most critical performance parameters. This paper presents experimental studies on the energy depletion characteristics of VoIP applications when using various codecs in an IEEE 802.11 Wireless LAN setting. The effect of high, medium and low bandwidth codecs on battery life is studied and an adaptive algorithm is proposed that switches codecs in the middle of an active call based on remaining battery life.
This paper deals with effect of lossy codecs used in telephony on text- independent speaker recognition. We investigate the influence for variety of codecs used in wired, cellular and IP telephony including the recently released SILK codec. The speaker recognition performance degradation is assessed with respect to the bandwidth usage, transmission packet loss and utilization of discontinuous transmission techniques. We show that there is only little loss in recognition performance for modern codecs operating at bitrates of about 15 kb/s. The best overall performance was observed for the SILK codec.
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