Topic
Adaptive Multi-Rate audio codec
About: Adaptive Multi-Rate audio codec is a research topic. Over the lifetime, 1467 publications have been published within this topic receiving 19736 citations. The topic is also known as: AMR & Adaptive Multi-Rate.
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08 Dec 2011
TL;DR: The experiments result show the quality of the audio-video streaming service was better when the audio codec used mpeg audio 64kbps-mpeg4 256kbps, which will be used as a reference implementation of audio- video streaming service later in the network Keerom, Papua.
Abstract: This study compared some video codec, audio codec, audio bit rate, video bit rate to determine the quality of the audio-video streaming service on the network Keerom, Papua. Average capacity in this network is 1.5Mbps. Mpeg audio and ac3 are choosen because of its characteristic, while the video codec is mpeg4 and H.264. Audio bit rate used 64 and 128kbps, while the video bit rate 64, 128 and 256kbps. The experiments result show the quality of the audio-video streaming service was better when the audio codec used mpeg audio 64kbps-mpeg4 256kbps. The test results will be used as a reference implementation of audio-video streaming service later in the network Keerom, Papua.
07 Aug 2002
TL;DR: In this article, an unequal power assignment strategy was proposed to maximize the admission capacity of one cell in a 3GPP-FDD system with integrated speech and data traffic, and the performance of the scheme was compared with the traditional equal power assignment (EPA) strategy.
Abstract: An unequal power assignment strategy 3G system is proposed in this paper, which aims to maximize the admission capacity of one cell. Through the analysis of multiple access interference (MAI) for the uplink of the 3G system, a formula to calculate the optimal power ratio for multimedia traffic is deduced. The performance of the novel strategy in a 3GPP-FDD system with integrated speech and data traffic has been investigated and compared with the traditional equal power assignment (EPA) strategy. Simulation results reveal that unequal power assignment outperforms the EPA. The application of the unequal power assignment strategy in the adaptive multi-rate (AMR) codec is investigated and simulation results show that different AMR modes have different influence on admission capacity.
Patent•
08 Nov 2005TL;DR: In this article, a speech data coding device (V) was proposed for transmitting speech data in a radio access network of a radio communication system, where the coded speech data is trans-coded into a speech codec (C2) by the coding device.
Abstract: The method involves receiving speech data (S) coded with a speech codec (C1) from a radio station (BTS) by a speech data coding device (V). The coding device receives signaling data (SIG) that is transferred between a radio control (BSC) and a radio station in a radio communication system. The coded speech data is trans-coded into a speech codec (C2) by the coding device. The speech data coded with the speech codec (C2) is transferred to a radio control via a radio interface, where the radio control is used for controlling transmission of the speech data. An independent claim is also included for a device for coding speech data in a radio access network of a radio communication system.
29 Oct 2002
TL;DR: The efficient software scheme for implementing AMR codec and detailed hardware design are described and evaluated and confirmed in 3GPP test sequences, stand-alone test system and ETRI IMT-2000 prototype system.
Abstract: ETRI adopt AMR codec for developing the 3GPP based IMT-2000 system. This paper presents the software and hardware implementation of multi-channel AMR codec. The real-time implementation of AMR codec algorithm is achieved using TMS320C62xx DSP chip. We describe the efficient software scheme for implementing AMR codec and detailed hardware design. The multi-channel AMR codec is evaluated and confirmed in 3GPP test sequences, stand-alone test system and ETRI IMT-2000 prototype system.
01 Nov 2014
TL;DR: One solution of a wireless audio system based on G.722 codec, implemented using the Microsoft Visual Studio development environment, and validated through the automated test framework developed for that purpose using the Python script language.
Abstract: Wireless technology for audio transmitting has many aspects of use. This paper describes one solution of a wireless audio system based on G.722 codec. One of a major problem in wireless technology is an electromagnetic interferences which can corrupt transmitted data. To protect against that problem, FEC (Forward Error Correction) technique was developed. One implementation of FEC is described in the paper. FEC is implemented using the Microsoft Visual Studio development environment. Validation of implemented solution was accomplished through the automated test framework that was developed for that purpose using the Python script language.