Convert AMR to ASF

AMR to ASF Converter converts AMR to ASF. The software is an ALL-IN-ONE audio converter that supports more than 100 audio and video files.

AMR to ASF Converter supports batch conversion and is full compatible with Vista and Windows 7.

1. Free Download AMR to ASF Converter
2. Install the software by instructions
3. Launch AMR to ASF Converter
4. Choose AMR Files
   
   Click "Add Files" to choose AMR files and add them to conversion list.
   
   
   Choose one or more AMR file(s) you want to convert and then click "Open".
   
   
5. Choose "to ASF"
   
   
   
6. Convert AMR to ASF
   
   Click "Convert" to convert AMR files to ASF format.
   
   
   The software is converting AMR files to ASF format.
   
   
7. Play and Browse ASF File
   
   Right-click converted file and choose "Play Destination" to play the outputted ASF file, choose "Browse Destination Folder" to open Windows Explorer to browse the ASF file.
   
   
8. Done

Free Download AMR to ASF Converter

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)

What is ASF?
Advanced Systems Format (formerly Advanced Streaming Format, Active Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Windows Media framework.

ASF is based on serialized objects which are essentially byte sequences identified by a GUID marker.

The format does not specify how (i.e. with which codec) the video or audio should be encoded; it just specifies the structure of the video/audio stream. This is similar to the function performed by the QuickTime, AVI, or Ogg container formats. One of the objectives of ASF was to support playback from digital media servers, HTTP servers, and local storage devices such as hard disk drives.

The most common filetypes contained within an ASF file are Windows Media Audio (WMA) and Windows Media Video (WMV). Note that the file extension abbreviations are different from the codecs which have the same name. Files containing only WMA audio can be named using a .WMA extension, and files of audio and video content may have the extension .WMV. Both may use the .ASF extension if desired.

ASF files can also contain objects representing metadata, such as the artist, title, album and genre for an audio track, or the director of a video track, much like the ID3 tags of MP3 files. It supports scalable media types and stream prioritization; as such, it is a format optimized for streaming.

The ASF container provides the framework for digital rights management in Windows Media Audio and Windows Media Video. An analysis of an older scheme used in WMA reveals that it is using a combination of elliptic curve cryptography key exchange, DES block cipher, a custom block cipher, RC4 stream cipher and the SHA-1 hashing function.

ASF container-based media is usually streamed on the internet either through the MMS protocol or the RTSP protocol.

AMR to ASF Related Topics: OGG to ASF, VOC to ASF, VQF to ASF, RAM to ASF, RMI to ASF, MXF to ASF, SHN to ASF, M4R to ASF, M2A to ASF, AAC to ASF, MPA to ASF, MTM to ASF, MPC to ASF, RMJ to ASF, MOD to ASF, WAV to ASF, AWB to ASF, F4A to ASF, MO3 to ASF, AU to ASF, AC3 to ASF, NSA to ASF, RA to ASF, ADTS to ASF, OMA to ASF, CDA to ASF, EAC3 to ASF, ALAW to ASF, MMF to ASF, APE to ASF