// Oprogramowanie Roman Ryltsov
Audio related stuff
See Why does the N770 have Google Talk instead of Skype? on Robin Jewsbury’s Forum Nokia Blog. I do share the opinion that SIP is going to be a mainstream protocol for Internet Voice [and Video?] applications, though there are other opinions (including SIMPLE, IAX etc.). It does not however seems to appear much too…
Summary The library implements some of the speech codecs provided with Intel IPP Library samples (G.726, G.728, GSM 06.90 AMR) as DirectShow filters (using DirectX Media Object technology) making it available to a wide range of DirectX 9 compatible applications. Usage of Intel Integrated performance primitives make the processing performance efficient. See DirectX GraphEdt utility…
Getting back to audio codecs, based on Intel IPP library, version 5.0. Basically, I made a wrapper over Intel’s Unified Speech Codec (USC) codec implementation that exposes codec as DMO which makes it available for a wide range of media applications. At the very moment GSM 06.90 AMR codec and G.726 codecs are available but…
Aurora DSR Overview at ETSI Aurora Evaluations, papers and presentations RFC 3557
A review of the cocktail party effect
The table below shows codecs features: Codec Frame Length Input Output AMR GSM 06.90 20 ms 8 KHz, 16 bit, Mono Bitrates: 4750, 5150, 5900, 6700, 7400, 7950, 10200, 12200; a discontinuous transmission mode (DTX) available with 1750 bps non-speech frames G.726 8 ms 8 KHz, 16 bit, Mono (a-law, μ-law native support possible) Bitrates:…
By the way, packaging more speech codecs into DMO interface is expected to come soon. With a certain luck it would go even farther to video coding… To appear: AMR-WB G.722.2 G.711 G.722 G.722.1 G.723.1 G.726 G.728 G.729 GSM 06.10 Already: AMR GSM 06.90 I would also need to make a summary table on input/output…