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G.729 (06/12) Free [19] Free Various proprietary VoIP software FFmpeg (decoding only) voice recording: No Yes No Expired [19] No G.729.1: ITU-T 2006-05 G.729.1 Am.8 (03/13) Free [19] Free Various proprietary VoIP software voice recording, DECT telephony No Yes No No No GSM-FR: ETSI Special Mobile Group 1990-1994 (ETS 300 580-2) ETSI EN 300 961 ...
As such, the user normally doesn't have a raw AAC file, but instead has a .m4a audio file, which is a MPEG-4 Part 14 container containing AAC-encoded audio. The container also contains metadata such as title and other tags, and perhaps an index for fast seeking. [2] A notable exception is MP3 files, which are raw audio coding without a ...
G.729.1 (G.729 Annex J; Wideband extension for G.711; 8–32 kbit/s) G.729.1E (Super-wideband extension for G.729.1) Google. internet Speech Audio Codec (iSAC) WebRTC; Nellymoser Asao Codec. FFmpeg (libavcodec) PictureTel PT716, PT716plus; PictureTel PT724; RTAudio – used by Microsoft Live Communication Server; SVOPC – used by Skype
File size is a measure of how much data a computer file contains or how much storage space it is allocated. Typically, file size is expressed in units based on byte. A large value is often expressed with a metric prefix (as in megabyte and gigabyte) or a binary prefix (as in mebibyte and gibibyte). [1]
G.726 is an ITU-T ADPCM speech codec standard covering the transmission of voice at rates of 16, 24, 32, and 40 kbit/s. It was introduced to supersede both G.721, which covered ADPCM at 32 kbit/s, and G.723 , which described ADPCM for 24 and 40 kbit/s.
Codec 2 is a low-bitrate speech audio codec (speech coding) that is patent free and open source. [1] Codec 2 compresses speech using sinusoidal coding, a method specialized for human speech. Bit rates of 3200 to 450 bit/s have been successfully created. Codec 2 was designed to be used for amateur radio and other high compression voice applications.
The speech encoder accepts 13 bit linear PCM at an 8 kHz sample rate. This can be direct from an analog-to-digital converter in a phone or computer, or converted from G.711 8-bit nonlinear A-law or μ-law PCM from the PSTN with a lookup table. In GSM, the encoded speech is passed to the channel encoder specified in GSM 05.03.
AMR-WB is codified as G.722.2, an ITU-T standard speech codec, formally known as Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB). G.722.2 AMR-WB is the same codec as the 3GPP AMR-WB. The corresponding 3GPP specifications are TS 26.190 for the speech codec [3] and TS 26.194 for the Voice Activity ...