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Friday, 28 September 2012

Technical Details of Lossless Audio Compression Formats

Technical Details of Lossless Audio Compression Formats
Audio compression format Algorithm Sample Rate Bits per sample Latency Stereo Multichannel
ALAC Lossless 1 Hz to 384000 Hz 16, 20, 24, 32[43] ? Yes Yes: Up to 8 channels
FLAC Lossless 1 Hz to 655350 Hz 8, 16, 20, 24, (32) 4.3ms - 92ms (46.4ms typical) Yes Yes: Up to 8 channels
Monkey's Audio Lossless 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48 kHz 8, 16, 24 ? Yes No
RealAudio Lossless Lossless Varies (see article) Varies (see article) Varies Yes Yes: Up to 6 channels
True Audio Lossless 0–4 GHz 1 to > 64 ? Yes Yes: Up to 65535 channels
WavPack Lossless Lossless, Hybrid 1 Hz to 16.777216 MHz varies in lossless mode; supports 32-bit float input; 2.2 minimum in lossy mode ? Yes Yes: Up to 256 channels
Windows Media Audio Lossless Lossless 8, 11.025, 16, 22.05, 32, 44.1, 48, 88.2, 96 kHz 16, 24 >100ms Yes Yes:Up to 6 channels
Technical Details of ITU-T Audio Compression Formats
Audio compression format Algorithm Sample Rate Bit rate[44] Bits per sample Latency CBR VBR Stereo Multichannel
G.711 companding A-law or μ-law, PCM, Lossy 8 kHz 64 kbit/s 8 bit 125µs (typical) Yes No No No
G.711.1 MDCT, A-law, μ-law, Lossy 8 or 16 kHz 64, 80, 96 kbit/s 16 bit 11.875 ms Yes Yes No No
G.718 CELP, MDCT, Lossy 8 or 16 kHz 8, 12, 12.65, 16, 24, 32 kbit/s 16 bit 42.875 ms - 43.875 ms Yes Yes No No
G.718B CELP, MDCT, Lossy, Sinusoidal Coding 32 kHz 36,40,48 kbit/s 16 bit 49.625 ms Yes Yes No No
G.719 Lossy, (incorporates elements of Siren Codec and Ericsson technology) 48 kHz 32-128 kbit/s
(Rates between 32 and 88 kbit/s shall be a multiple of 4 kbit/s; 88-128 kbit/s - a multiple of 8 kbit/s.)
16 bit 40 ms Yes No Yes: only in MPEG-4 Part 12 container Yes: only in MPEG-4 Part 12 container
G.721 ADPCM, Lossy 8 kHz 32 kbit/s 13 bit
Yes No No No
G.722 sub-band ADPCM, Lossy 16 kHz 64 kbit/s
(comprises 48, 56 or 64 kbit/s audio and 16, 8 or 0 kbit/s auxiliary data)
14 bit 4 ms Yes No No No
G.722.1 Modulated Lapped Transform, (based on Siren Codec), Lossy 16 kHz 24, 32 kbit/s 16 bit 40 ms Yes No No No
G.722.1C Modulated Lapped Transform, (based on Siren Codec), Lossy 32 kHz 24, 32, 48 kbit/s 16 bit 40 ms Yes No No No
G.722.2 (AMR-WB) multi-rate wideband ACELP, Lossy 16 kHz 6.60-23.85 kbit/s
(6.60, 8.85, 12.65, 14.25, 15.85, 18.25, 19.85, 23.05 or 23.85 kbit/s)
14 bit 25 ms Yes Yes Yes: only in MPEG-4 Part 12 container No
G.723 ADPCM, Lossy 8 kHz 24 or 40 kbit/s 13 bit
Yes No No No
G.723.1 MP-MLQ, ACELP, Lossy 8 kHz 5.3, 6.3 kbit/s 13 bit 37.5 ms Yes No No No
G.726 ADPCM, Lossy 8 kHz 16, 24, 32, 40 kbit/s 13 bit 125us Yes No No No
G.727 ADPCM, Lossy 8 kHz 16, 24, 32, 40 kbit/s 13 bit
Yes Yes No No
G.728 low-delay CELP, Lossy 8 kHz 16 kbit/s 13 bit 0.625 ms Yes No No No
G.729 CS-ACELP, Lossy 8 kHz 8 kbit/s 13 bit 15 ms Yes No No No
G.729D CS-ACELP, Lossy 8 kHz 6.4 kbit/s 13 bit
Yes No No No
G.729E CS-ACELP, Lossy 8 kHz 11.8 kbit/s 13 bit 15 ms Yes No No No
G.729.1 CELP, TDBWE, TDAC, Lossy 8 or 16 kHz 8-32 kbit/s
(12 layers; 2 kbit/s steps, (10 kbit/s omitted))
16 bit 48.9375 ms Yes Yes No No

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