Convert MP2 to AMR

Total Audio MP3 Converter converts MP2 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.

1. Free Download Total Audio MP3 Converter here and then install the software by instructions
2. Launch Total Audio MP3 Converter
3. Choose MP2 Files
   
   Click "Add Files" to choose MP2 files and then add them to conversion list.
   
   
   Choose one or more MP2 files you want to convert and then click Open.
   
   
4. Choose "to AMR"
   
   
   
5. Convert MP2 to AMR
   
   Click button "Convert" to convert all MP2 files to AMR format.
   
   
   The software is converting MP2 files to AMR format.
   
   
6. 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.

Free Download Total Audio MP3 Converter

What is MP2?
MPEG-1 Audio Layer II (MP2, sometimes incorrectly called Musicam) is a lossy audio codec defined by ISO/IEC 11172-3. While MP3 is much more popular for PC and internet applications, MP2 remains a dominant standard for audio broadcasting.

MP2 began in the late 1980s as part of the ISO's Moving Picture Experts Group (MPEG) effort to standardize digital audio and video encoding for digital radio and TV broadcasting (DAB, DMB, DVB), and use on Video CD. The MPEG-1 audio standard was based on the existing MUSICAM and ASPEC audio formats. The MPEG-1 standard, including the three audio "layers" (encoding techniques) now known as MP1, MP2 and MP3, was finalized by December 1991 in the committee draft of ISO-11172. MPEG audio was further promoted due to its Layer III (MP3) component, which allowed for even lower bitrates.

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)

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