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Convert QCP to AMR
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Total Audio MP3 Converter converts QCP 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 QCP Files
Click "Add Files" to choose QCP files and then add them to conversion
list.
Choose one or more QCP files you want to convert and then click Open.
- Choose "to AMR"
- Convert QCP to AMR
Click button "Convert" to convert all QCP files to AMR format.
The software is converting QCP 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 QCP?
Qualcomm PureVoice QCELP recoder and player voice file. Qualcomm's PureVoice®
products offer a range of superior voice and audio enhancement software for CDMA
products. Optimized for Qualcomm's Mobile Station Modem (MSM™) device platforms,
the PureVoice product suite consists of voice recording technology, voice recognition
software and audio automatic gain control.
PureVoice Voice Recording technology provides landline-quality voice transmission
that operates at variable encoding rates in order to take advantage of natural
pauses in human speech. The high-quality, high-compression solution is useful
for store-and-forward as well as streaming applications, and the technology accommodates
erasures (dropped data), resulting in better performance on real-time applications.
PureVoice Audio Automatic Gain Control (AGC) provides the highest quality stereo
enhancement software available for Qualcomm's MSM platforms, enabling CDMA handset
manufacturers a simple "drop-in" solution for enhancing the sound quality
and usability of their phones. PureVoice AGC is most effective in adverse noise
conditions where background noise would otherwise prevent intelligible phone conversations.
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 QCP to AMR Related Topics:
ASF to AMR,
ALAC to AMR,
WMA to AMR,
DVR-MS to AMR,
WAV to AMR,
F4A to AMR,
MJ2 to AMR,
SWF to AMR,
DXA to AMR,
OGG to AMR,
FLAC to AMR,
VMD to AMR,
DIVX to AMR,
MLP to AMR,
MXF to AMR,
RPL to AMR,
QT to AMR,
MP1 to AMR,
AMR to M4A,
H263 to AMR,
H264 to AMR,
NSV to AMR,
OGM to AMR,
MPC to AMR,
AMV to AMR,
EVOB to AMR,
3GPP to AMR,
MOD to AMR,
M4V to AMR,
MKA to AMR,
3G2 to AMR,
MP2 to AMR,
HDTV to AMR,
ULAW to AMR,
AMR to OGG,
MPA to AMR,
MPGA to AMR,
4XM to AMR,
SPX to AMR,
M4B to AMR
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