Convert DRC to AMR, DRC to AMR Converter

AMR MP3 Converter
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Total Audio MP3 Converter

Convert DRC to AMR

Total Audio MP3 Converter converts DRC 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 DRC Files

  4. Click "Add Files"
    Click "Add Files" to choose DRC files and then add them to conversion list.

    Choose one or more DRC files
    Choose one or more DRC files you want to convert and then click Open.

  5. Choose "to AMR"

  6. Convert to AMR

  7. Convert DRC to AMR

  8. Click Convert
    Click button "Convert" to convert DRC files to AMR format.

    Converting DRC to AMR
    The software is converting DRC files to AMR format.

  9. Play and Browse AMR File

  10. Play and Browse AMR File
    When conversion completes, you could right-click converted AMR file and choose "Play Destination" to play the outputted AMR file; or choose "Browse Destination Folder" to open Windows Explorer to browse the AMR file.

What is DRC?
Dirac Video. Dirac is an open and royalty-free video compression format, specification and system developed by BBC Research at the BBC. Schrodinger and dirac-research (formerly just called 'Dirac') are open and royalty-free software implementations (video codecs) of Dirac. Dirac format aims to provide high-quality video compression from web video up to ultra HD and beyond, and as such competes with existing formats such as H.264 and VC-1.

The specification was finalised on 21 January 2008, and further developments will only be bug fixes and constraints. In September of that year version 1.0.0 of the reference implementation was released which corresponds to an intra-frame only subset known as Dirac Pro, which has been proposed to the SMPTE for standardisation as VC-2. Version 2.2.3 of the full Dirac specification, including motion compensation and inter-frame coding, was issued a few days later. Dirac Pro was used internally by the BBC to transmit HDTV pictures at the Beijing Olympics in 2008.

The format implementations are named in honour of the theoretical physicists Paul Dirac and Erwin Schrodinger, who shared the 1933 Nobel Prize in physics.

Dirac supports resolutions up to HDTV (1920x1080) and greater and is claimed to provide significant savings in data rate and improvements in quality over video compression formats such as MPEG-2 Part 2, MPEG-4 Part 2 and its competitors, e.g. Theora, and WMV. Dirac's implementers make the preliminary claim of "a two-fold reduction in bit rate over MPEG-2 for high definition video", which makes it comparable to the latest generation standards such as H.264/MPEG-4 AVC and VC-1.

Dirac supports both constant bit rate and variable bit rate operation. When the low delay syntax is used, the bit rate will be constant for each area (Dirac slice) in a picture to ensure constant latency. Dirac supports lossy and lossless compression modes.

Dirac employs wavelet compression, instead of the discrete cosine transforms used in most older compression formats. Dirac is one of several projects attempting to apply wavelets to video compression. Others include Rududu, Snow, RedCode and Tarkin. Wavelet compression is also used in the JPEG 2000 and PGF compression standards for photographic images.

Dirac can be used in various container formats (e.g., AVI, Ogg, MKV). It was registered for the use in container formats based on the ISO base media file format (MPEG-4 Part 12; e.g., MP4). It was also registered for use in MPEG-2 transport stream.

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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