Motorola K3 ユーザーズマニュアル
18
Type
Description
boosts higher quality audio reproduction than MP3 and requires
30% less data to do so.
30% less data to do so.
AMR-NB, AMR-
WB
WB
Adaptive Multi Rate offers a wide range of data rates. The
philosophy behind AMR is to lower the data rate as the
interference increases to enable better error correction.
philosophy behind AMR is to lower the data rate as the
interference increases to enable better error correction.
GSM FULL RATE
Format for speech coding used in most GSM networks. The GSM
full rate requires one full rate traffic channel to carry its data. The
compression involves mapping input blocks of 160 speech
samples to encoded blocks of 260 bits.
full rate requires one full rate traffic channel to carry its data. The
compression involves mapping input blocks of 160 speech
samples to encoded blocks of 260 bits.
MP3
The MP3 format (.mp3) provides the coding of audio for digital
storage.
storage.
Real Audio
Real Audio (.ra, .rm) is a compressed format suitable for streaming
over the internet.
over the internet.
WAV
Format for storing files (.wav). Linear pcm 8-bit and 16-bit, CCITT
A-law and U-law.
A-law and U-law.
WMA
Windows Media Audio (.wma), referring to components of the more
general Windows Media Format proprietary standard.
general Windows Media Format proprietary standard.
XMF
Mobile XMF-MIDI: XMF (eXtensible Music Format) is an open
standard file format for gathering together into a single file all
media assets (and/or links to external media assets) required to
render a MIDI note-based piece (or suite of related pieces) in a
computer-based player (or possibly an instrument) with consistent
audio playback across all players and platforms, and suited for
interactivity, content protection, meta-data, and the Internet – and
keep it simple.
standard file format for gathering together into a single file all
media assets (and/or links to external media assets) required to
render a MIDI note-based piece (or suite of related pieces) in a
computer-based player (or possibly an instrument) with consistent
audio playback across all players and platforms, and suited for
interactivity, content protection, meta-data, and the Internet – and
keep it simple.
Table 16 Supported audio formats
Table 17 shows the bit rate, sampling rate, and stereo/mono capabilities for each
supported format:
supported format:
Format
Bit Rate (kbps)
Sampling Rate (kHz)
Stereo/Mono
AMR-NB
4.75 kbps – 12.20 kbps
(supports all 3GPP
specified rates)
8 kHz
AMR – WB
6.6 – 23.85 (suports all
3GPP specified rates)
16
Mono
AAC
(MPEG4 AAC-LC)
Up to 256 kbps
48 kHz
Stereo / Mono
AAC+
Stereo / Mono
Enhanced AAC+
Up to 128 kbps
(16 to 128 kbps)
Up to 48 kHz
(16, 22.05, 24, 32, 44.1,
48 kHz)
Stereo
MP3
2
Up to 256 kbps
48 kHz
Stereo / Mono
8-bit Linear PCM
64 kbps
8 kHz
Mono
2
Supports the MP3 coding scheme for the compression of audio signals, as defined in the MPEG-1 and MPEG-2, Part
3 (audio), Layer 3 standard.