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ISO/MPEG1/2
AAC-LD
Layer 2/3
AAC-ELD
Sub-Band,
Sub-Band,
Algorithm
Psychoacoustics
Psychoacoustics
Structure
Frames
Bandwidth
20-Hz ... 20-kHz
20-Hz ... 20-kHz
MPEG1:
Sampling Rates
32, 48
(kHz)
MPEG2:
16, 24
Data rates
Typical:
LD: 64... 128
(kbit/s)
128...192kbit/s
ELD: 48...136
Layer 2: 150 ms
LD: < 50 ms
Delay
Layer 3: 250 ms
ELD: < 30 ms
Audio Codecs
HE-AAC-LC
G.722
HE-AAC-V1/2
Sub-Band,
ADPCM
Psychoacoustics
Frames
Frames
Bytes
20-Hz ... 20-kHz
50-Hz ... 7-kHz
16, 24,
LC: 32, 48
16
32, 48
V1/V2: 16, 24
Typical:
Typical:
LC: 96
48, 56, 64
V1: 80
V2: 64
LC: 350 ms
< 10 ms
V1/V2: 450 ms
OPUS
G.711
PCM16/20/24
PCM
N/A
CELT
Bytes
Bytes
Frames
300-Hz ... 3.4-kHz
20-Hz ... 20-kHz
20-Hz...20-kHz
max. 48
8
32, 48
dynamic
56, 64
512...2304
16...384
< 5 ms
< 3 ms
<30 ms
FLAC
SILK
PCM
Frames
20-Hz...20-kHz
48
Typical:
300 ... 2000
7
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