Convert MLP to AMR

Total Audio MP3 Converter converts MLP 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 MLP Files
   
   Click "Add Files" to choose MLP files and then add them to conversion list.
   
   
   Choose one or more MLP files you want to convert and then click Open.
   
   
4. Choose "to AMR"
   
   
   
5. Convert MLP to AMR
   
   Click button "Convert" to convert all MLP files to AMR format.
   
   
   The software is converting MLP 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 MLP?
MLP (Meridian Lossless Packing) is a lossless coding system for use on high-quality digital audio data originally represented as linear PCM. High quality audio these days implies high sample rates, large word sizes and multichannel.

The MLP is used by Meridian codec. Audio compression used on DVD video discs.

MLP performs lossless compression of up to 63 audio channels including 24-bit material sampled at rates as high as 192kHz.

Lossless compression has many applications in the recording and distribution of audio. In designing MLP we have paid a lot of attention to the application of lossless compression to data-rate-limited ransmission (e.g. storage on DVD), to the option of constant data rate in the compressed domain and to aspects that impact on mastering and authoring. MLP was targeted to provide:

• Good compression of both peak and average data rates.
• Use of both fixed and variable-rate data-streams.
• Automatic savings on bass-effects channels.
• Automatic savings on signals that do not use all of the available bandwidth (e.g. sampled at 96kHz).
• Automatic savings when channels are correlated.
• Comprehensive metadata.
• Hierarchical access to multichannel information.
• Modest decoding requirements.

MLP provides for up to 63 channels, but applications tend to be limited by the available data rate. To aid compatibility, MLP uses a hierarchical stream structure containing multiple substreams and hierarchical additional data. With this stream structure decoders need only access part of the stream to playback subsets of the audio. Suitable use of the substreams also allows 2-channel compatibility; a low-complexity decoder can recover a stereo mix from a multichannel stream. Figure 1 gives an overview of the process of losslessly compressing a stream containing multiple audio channels and auxiliary data onto a disc.

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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