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| boosts higher quality audio reproduction than MP3 and requires |
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| 30% less data to do so. |
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| Adaptive Multi Rate offers a wide range of data rates. The |
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| WB |
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| philosophy behind AMR is to lower the data rate as the |
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| interference increases to enable better error correction. |
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| GSM FULL RATE |
| Format for speech coding used in most GSM networks. The GSM |
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| full rate requires one full rate traffic channel to carry its data. The |
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| compression involves mapping input blocks of 160 speech |
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| samples to encoded blocks of 260 bits. |
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| MP3 |
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| The MP3 format (.mp3) provides the coding of audio for digital |
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| storage. |
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| Real Audio |
| Real Audio (.ra, .rm) is a compressed format suitable for streaming |
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| WAV |
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| Format for storing files (.wav). Linear pcm |
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| WMA |
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| Windows Media Audio (.wma), referring to components of the more |
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| general Windows Media Format proprietary standard. |
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| Mobile |
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| standard file format for gathering together into a single file all |
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| media assets (and/or links to external media assets) required to |
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| render a MIDI |
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| audio playback across all players and platforms, and suited for |
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| interactivity, content protection, |
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| keep it simple. |
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| Table 16 Supported audio formats |
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| Table 17 shows the bit rate, sampling rate, and stereo/mono capabilities for each |
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Format | Bit Rate (kbps) |
| Sampling Rate (kHz) | Stereo/Mono |
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| 4.75 kbps – 12.20 kbps |
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(supports all 3GPP |
| 8 kHz |
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| specified rates) |
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| Mono |
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AMR – WB | 6.6 – 23.85 (suports all |
| 16 |
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3GPP specified rates) |
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AAC | Up to 256 kbps |
| 48 kHz | Stereo / Mono |
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(MPEG4 |
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AAC+ | Up to 128 kbps |
| Up to 48 kHz | Stereo / Mono |
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| (16, 22.05, 24, 32, 44.1, |
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Enhanced AAC+ | (16 to 128 kbps) |
| Stereo |
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| 48 kHz) |
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MP32 | Up to 256 kbps |
| 48 kHz | Stereo / Mono |
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64 kbps |
| 8 kHz | Mono |
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2Supports the MP3 coding scheme for the compression of audio signals, as defined in the
3 (audio), Layer 3 standard.
18
