Convert VMD to AMR
Total Audio MP3 Converter converts VMD 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 VMD Files
Click "Add Files" to choose VMD files and then add them to conversion
Choose one or more VMD files you want to convert and then click Open.
- Choose "to AMR"
- Convert VMD to AMR
Click button "Convert" to convert all VMD files to AMR format.
The software is converting VMD 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 VMD?
VMD is the file extension of a multimedia file format used in a number of Sierra
CD-ROM computer games. The extension stands for Video and Music Data. The format
is most notable for its use in Sierra's beloved 7-CD classic, Phantasmagoria,
and is also used in other multimedia-heavy Sierra titles.
The VMD video coding method uses the Lempel-Ziv (LZ77) algorithm, run length
encoding (RLE), and interframe differencing to compress 8-bit palettized video
data. 8-bits audio stored as a raw PCM samples, all 16-bits sound are 2:1 DPCM-encoded.
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 VMD to AMR Related Topics:
MPG to AMR,
MPGA to AMR,
SWF to AMR,
ADX to AMR,
XVID to AMR,
CDA to AMR,
VOC to AMR,
SMK to AMR,
MLP to AMR,
XM to AMR,
PVA to AMR,
AU to AMR,
SND to AMR,
M2TS to AMR,
RPL to AMR,
OMA to AMR,
AMV to AMR,
WMD to AMR,
UMX to AMR,
VQF to AMR,
QCP to AMR,
OGM to AMR,
AVI to AMR,
WMV to AMR,
AMR to AWB,
DV to AMR,
SOL to AMR,
TTA to AMR,
MPA to AMR,
MMF to AMR,
CAF to AMR,
NUV to AMR,
M4A to AMR,
VCD to AMR,
WAV to AMR,
NSA to AMR,
3GPP to AMR,
SHN to AMR,
HDTV to AMR,
DXA to AMR