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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4 citations
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12 May 2015TL;DR: In this paper, the authors propose a method to change the coding rate of a multimode audio codec by determining that the request corresponds to a coding rate lower than the requested coding rate.
Abstract: There is inter alia a method comprising: receiving a request to change the coding rate of a multimode audio codec; determining that the request corresponds to a coding rate of another mode of operation of the multimode audio codec; determining a frame of an input audio signal of the multimode audio codec to be an active region of the audio signal; maintaining a current operating mode of the multimode audio codec; and reducing the coding rate of the multimode audio codec to a coding rate lower than the requested coding rate.
4 citations
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22 Oct 1998TL;DR: This paper provides a reduced complexity version of the G.723.1 dual rate speech coder for multimedia communication transmitting at 5.3 and 6.3 kbit/s, which is a bit stream interoperable with the full version.
Abstract: This paper provides a reduced complexity version of the G.723.1 dual rate speech coder for multimedia communication transmitting at 5.3 and 6.3 kbit/s. This version is bit stream interoperable with the full version, i.e. a reduced complexity encoder may be used with a full implementation of the decoder. This simplified G.723.1 has been applied in a multimedia system, ITU-T H.324, that is implemented based on the PC platform of Windows95. The H.324 are the terminals for low bit rate multimedia communication, utilizing V.34 modems operating over the general switched telephone network (GSTN). The H.324 terminals include the H.223 multiplex, H.245 control, H.263 video codec, and the G.723.1 audio codec. The bottleneck for this system is the enormous computing quantity and current PCs speed. The video codec and the audio codec account for most of the computing quantity. Intel MMX assembly of the Pentium can be used effectively to reduced the computing quantity for the H.263 video codec, but it does not work for G.723 audio, as audio is represented in a different way from video. It is difficult to reduce the computing complexity of G.723. This paper provides a program optimized and reduced complexity version of the G.723.1 audio codec. This version is a bit stream interoperable with the full version. A real-time test shows, the computing complexity of this optimized and simplified version of G.723.1 audio codec has been 33% of the full version. The quality of reconstructed audio in this version is almost the same as the full version.
4 citations
01 Jan 1996
4 citations