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Convert 3GP2 to AMR
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Total Audio MP3 Converter converts 3GP2 files to AMR format.
The software is an all in one audio converter that supports more than 90 audio
and video files as input, and converts to popular formats such as MP3, WAV, AAC,
M4A, OGG, WMA, and AMR.
Total Audio MP3 Converter also supports batch conversion, and is full compatible
with Vista and Windows
7.
- Free Download
Total Audio MP3 Converter here and then install the software
by instructions
- Launch Total Audio MP3 Converter
- Choose 3GP2 Files
Click "Add Files" to choose 3GP2 files and then add them to conversion
list.
Choose one or more 3GP2 files you want to convert and then click Open.
- Choose "to AMR"
- Convert 3GP2 to AMR
Click button "Convert" to convert all 3GP2 files to AMR format.
The software is converting 3GP2 files to AMR format.
- Play & Browse
When conversion completes, you could right-click converted item and choose "Play
Destination" to play the destination file; or choose "Browse Destination
Folder" to open Windows Explorer to browse the destination file.
Top
What is 3GP2?
3GPP and 3GPP2 are the new worldwide standards for the creation, delivery and
playback of multimedia over 3rd generation, high-speed wireless networks. Defined
by the 3rd Generation Partnership Project and 3rd Generation Partnership Project
2 respectively, these standards seek to provide uniform delivery of rich multimedia
over newly evolved, broadband mobile networks (3rd generation networks) to the
latest multimedia-enabled wireless devices. 3GPP and 3GPP2 are based on the MPEG-4
standard which was derived from Apple's QuickTime. QuickTime 6.5 includes support
for key components of the 3GPP and 3GPP2 specifications.
The 3GP and 3G2 file formats are both structurally based on the ISO base media
file format defined in ISO/IEC 14496-12 - MPEG-4 Part 12, but older versions of
the 3GP file format did not use some of its features. 3GP and 3G2 are a container
formats similar to MPEG-4 Part 14 (MP4), which is also based on MPEG-4 Part 12.
The 3GP and 3G2 file format were designed to decrease storage and bandwidth requirements
in order to accommodate mobile phones.
What is AMR?
Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for speech
coding. AMR was adopted as the standard speech codec by 3GPP in October 1998 and
is now widely used in GSM and UMTS. It uses link adaptation to select from one
of eight different bit rates based on link conditions. AMR is also a file format
for storing spoken audio using the AMR codec. Many modern mobile telephone handsets
will allow you to store short recordings in the AMR format. There also exists
another storage format for AMR that is suitable for applications with more advanced
demands on the storage format, like random access or synchronization with video.
This format is the 3GPP-specified 3GP container format based on ISO base media
file format.
Key Features:
- Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to
200-3400 Hz.
- The AMR codec uses eight source codecs with bit-rates of 12.2, 10.2, 7.95,
7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s.
- Generates frame length of 95, 103, 118, 134, 148, 159, 204, or 244 bits for
bit rates 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2, or 12.2 kbit/s, respectively
- AMR utilizes Discontinuous Transmission (DTX), with Voice Activity Detection
(VAD) and Comfort Noise Generation (CNG) to reduce bandwidth usage during silence
periods
- Algorithmic delay is 20 ms per frame. For bit-rates of 12.2, there is no 'algorithm'
look-ahead delay. For other rates, look-ahead delay is 5 ms. Note that there is
5 ms 'dummy' look-ahead delay, to allow seamless frame-wise mode switching with
the rest of rates.
- AMR is a hybrid speech coder which uses Algebraic Code Excited Linear Prediction
(ACELP)
- The complexity of the algorithm is rated at 5, using a relative scale where
G.711 is 1 and G.729a is 15.
- PSQM testing under ideal conditions yields Mean Opinion Scores of 4.14 for
AMR (12.2 kbit/s), compared to 4.45 for G.711 (u-law)
- PSQM testing under network stress yields Mean Opinion Scores of 3.79 for AMR
(12.2 kbit/s), compared to 4.13 for G.711 (u-law)
Convert 3GP2 to AMR Related Topics:
3GPP to AMR,
MXF to AMR,
MTM to AMR,
WM to AMR,
MVI to AMR,
NSV to AMR,
OGM to AMR,
FLV to AMR,
ULAW to AMR,
MMF to AMR,
MO3 to AMR,
MPEG to AMR,
4XM to AMR,
OGX to AMR,
ROQ to AMR,
HDTV to AMR,
DVD to AMR,
MPGA to AMR,
OMA to AMR,
AMR to WAV,
M2A to AMR,
WAV to AMR,
AWB to AMR,
MOV to AMR,
VOC to AMR,
WMV to AMR,
OGV to AMR,
AMR to M4B,
UMX to AMR,
AMR to AWB,
VCD to AMR,
OGG to AMR,
MJ2 to AMR,
FLIC to AMR,
DAT to AMR,
M4V to AMR,
M2V to AMR,
MTV to AMR,
MPE to AMR,
M2TS to AMR
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