 |
Convert OMA to AMR
|
Total Audio MP3 Converter converts OMA 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 OMA Files
Click "Add Files" to choose OMA files and then add them to conversion
list.
Choose one or more OMA files you want to convert and then click Open.
- Choose "to AMR"
- Convert OMA to AMR
Click button "Convert" to convert all OMA files to AMR format.
The software is converting OMA 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 OMA?
A file with the OMA file extension is a Sony OpenMG Music Format file. Files in
ATRAC3 (Adaptive TRansform Acoustic Coding3) An audio compression technology from
Sony that provides multiple compression ratios depending on desired sound quality.
At 132 Kbps, the music can be compressed to approximately 10% of the space used
by a CD. Introduced on the MiniDisc in 1993, the original ATRAC format provided
near CD quality sound, but ATRAC3, introduced in 1999, rivals the CD. ATRAC compression
is 5:1; ATRAC3 is 10:1.
ATRAC3plus In 2002, Sony introduced ATRAC3plus, which provides a 20:1 compression
ratio, bringing the data down to 5% of the original CD. It can achieve very high
quality sound at 48 and 64 Kbps or be practically indistinguishable from the original
at 256 Kbps. The CD data rate is 1,411 Kbps.
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 OMA to AMR Related Topics:
OMA to AMR,
MPC to AMR,
MVI to AMR,
DV to AMR,
SWF to AMR,
M4B to AMR,
STR to AMR,
FLV to AMR,
WAVE64 to AMR,
MJ2 to AMR,
CAF to AMR,
ALAW to AMR,
SHN to AMR,
3GPP to AMR,
APE to AMR,
OGM to AMR,
AU to AMR,
UMX to AMR,
OGA to AMR,
M1V to AMR,
VMD to AMR,
DXA to AMR,
VFW to AMR,
M2A to AMR,
WAV to AMR,
NSV to AMR,
HDTV to AMR,
WV to AMR,
SND to AMR,
PVA to AMR,
AWB to AMR,
AMR to MP4,
MTV to AMR,
OGG to AMR,
AIFF to AMR,
VQF to AMR,
S3M to AMR,
MTS to AMR,
TTA to AMR,
AMR to WAV
|
