Convert 3GP to AMR
Total Audio MP3 Converter converts 3GP 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
- Free Download
Total Audio MP3 Converter here and then install the software
- Launch Total Audio MP3 Converter
- Choose 3GP Files
Click "Add Files" to choose 3GP files and then add them to conversion
Choose one or more 3GP files you want to convert and then click Open.
- Choose "to AMR"
- Convert 3GP to AMR
Click button "Convert" to convert all 3GP files to AMR format.
The software is converting 3GP 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.
What is 3GP?
3GP is a multimedia container format defined by the Third Generation Partnership
Project (3GPP) for use on 3G mobile phones but can also be played on some 2G and
3GP is a simplified version of the MPEG-4 Part 14 (MP4) container format, designed
to decrease storage and bandwidth requirements in order to accommodate mobile
phones. It stores video streams as MPEG-4 Part 2 or H.263 or MPEG-4 Part 10 (AVC/H.264),
and audio streams as AMR-NB, AMR-WB, AMR-WB+, AAC-LC or HE-AAC. A 3GP file is
always big-endian, storing and transferring the most significant bytes first.
It also contains descriptions of image sizes and bitrate. There are two different
standards for this format:
- 3GPP (for GSM-based Phones, may have filename extension .3gp)
- 3GPP2 (for CDMA-based Phones, may have filename extension .3g2)
Both are based on MPEG-4 and H.263 video, and AAC or AMR audio.
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
- Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to
- 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
- 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
- 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 3GP to AMR Related Topics:
OMA to AMR,
TS to AMR,
WAVE64 to AMR,
VCD to AMR,
AMR to M4B,
MLP to AMR,
STR to AMR,
XVID to AMR,
WV to AMR,
3GP to AMR,
TTA to AMR,
SDP to AMR,
3GPP to AMR,
ALAW to AMR,
FLIC to AMR,
DTS to AMR,
ADX to AMR,
MOD to AMR,
MP2 to AMR,
MKA to AMR,
MKV to AMR,
AMR to AAC,
MJ2 to AMR,
3G2 to AMR,
MPC to AMR,
MPEG to AMR,
PSX to AMR,
OGG to AMR,
SHN to AMR,
M1A to AMR,
ASF to AMR,
VMD to AMR,
MPGA to AMR,
AVI to AMR,
CAF to AMR,
MTM to AMR,
NSV to AMR,
RPL to AMR,
M4B to AMR,
VQF to AMR