AMR MP3 Converter FAQ

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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.

Adaptive Multi Rate - WideBand (AMR-WB) is a speech coding standard developed after the AMR using same technology like ACELP. The codec provides excellent speech quality due to wider speech bandwidth of 50-7000 Hz compared to narrowband speech codecs which in general are optimized for POTS wireline quality of 300-3400 Hz. AMR-WB is codified as G.722.2, an ITU-T standard speech code.

AMR MP3 Converter converts more than 90 audio and video files into MP3 / WAV / OGG / AMR / AWB / AAC / MP4 / M4A / M4B. You can follow instructions below to get started.

1. Click "Add File" to choose audio and video files;
2. Set target file format
3. Click "Convert" to convert file

For more detailed information, please click here.

1. Click "Add Files" to choose mobile phone AMR files;
2. Choose "to MP3"
3. Click "Convert"

1. Click "Add Files" to choose MP3 files;
2. Choose "to AMR"
3. Click "Convert"

1. Click "Add Files" to choose mobile phone AWB files;
2. Choose "to MP3"
3. Click "Convert"

1. Click "Add Files" to choose MP3 files;
2. Choose "to AWB"
3. Click "Convert"

The AMR is designed for speech. Only 12.2 kbps at most. It isn't a good idea to convert a music file to AMR. However, you may convert audiobook to AMR and listen with your mobile phone.

Many mobile phones support AMR files. We collect most of the phones and list in table below.

1. Click "Add Files" to choose AMR files;
2. Click "Options" -> "AMR Options" -> "AMR Encoding Parameters" section, set target encoding parameters;
3. Choose "to AMR"
4. Click "Convert"

Yes, it does.

AMR MP3 Converter supports the following files.

• Input Files 3GP, 3G2, SWF, AAC, AIFF, AIF, AIFC, AFC, AMR, AWB, AU, SND, AVI, CDA, VOC, ADX, AC3, DTS, DV, DIF, VOB, DVD, CDATA, FLV, FLAC, M2TS, MTS, MKV, MKA, DVR-MS, MJPG, MJPEG, MMF, MOD, XM, IT, S3M, MTM, UMX, MO3, APE, APL, MAC, MIDI, MID, RMI, KAR, MP3, MPA, MPGA, M2A, MPG, MPE, MPEG, M1V, MP2, M2V, MP1, MLV, M4A, M4B, MP4, TS, M4V, MPV, PSP, MPC, MP+, MPP, NSV, NSA, NUT, OGG, OGA, OGM, OGV, OGX, MOV, QT, H261, H263, H264, 264, RA, RAM, RM, RMVB, SPX, TTA, DAT, WAV, WV, WMA, ASF, WMV, WM, WMD, XWMV, and YUV.
• Output Files MP3, WAV, WMA, OGG, AMR, AWB, AAC, MP4, M4A, and M4B

Refer to the following links.

AMR MP3 Converter supports the following encoding parameters for MP3.

• Sample Frequency: supports 8000 Hz, 11025 Hz, 12000 Hz, 16000 Hz, 22050 Hz, 24000 Hz, 32000 Hz, 44100 Hz and 48000 Hz.
• Bit Rate: supports 8 kbps, 16 kbps, 24 kbps, 32 kbps, 40 kbps, 48 kbps, 56 kbps, 64 kbps, 80 kbps, 96 kbps, 112 kbps, 128 kbps, 144 kbps, 160 kbps, 192 kbps, 224 kbps, 256 kbps, and 320 kbps.
• Channels: supports joint stereo, stereo, and mono.

AMR MP3 Converter supports the following encoding parameters for WAV.

• Sample Frequency: supports 6000 Hz, 8000 Hz, 11025 Hz, 12000 Hz, 16000 Hz, 22050 Hz, 24000 Hz, 32000 Hz, 44100 Hz, 48000 Hz, 88200 Hz and 96000 Hz.
• Bits: supports 8 bits and 16 bits.
• Channels: supports mono and stereo.

AMR MP3 Converter supports the following encoding parameters for OGG.

• Sample Frequency: supports 8000 Hz, 11025 Hz, 12000 Hz, 16000 Hz, 22050 Hz, 24000 Hz, 32000 Hz, 44100 Hz and 48000 Hz.
• Bit Rate: supports 8 kbps, 16 kbps, 24 kbps, 32 kbps, 40 kbps, 48 kbps, 56 kbps, 64 kbps, 80 kbps, 96 kbps, 112 kbps, 128 kbps, 144 kbps, 160 kbps, 192 kbps, 224 kbps, 256 kbps, 320 kbps, 400 kbps, and 480 kbps..
• Channels: supports stereo, and mono.

AMR MP3 Converter supports the following encoding parameters for AMR.

• Bit Rate: supports 4.75 kbps, 5.15 kbps, 5.9 kbps, 6.7 kbps, 7.4 kbps, 7.95 kbps, 10.2 kbps, and 12.2 kbps.
• Enable DTX: Discontinuous transmission (DTX) is a method of momentarily powering-down, or muting, a mobile or portable wireless telephone set when there is no voice input to the set. This optimizes the overall efficiency of a wireless voice communications system. In a typical two-way conversation, each individual speaks slightly less than half of the time. If the transmitter signal is switched on only during periods of voice input, the duty cycle of the telephone set can be cut to less than 50 percent. This conserves battery power, eases the workload of the components in the transmitter amplifiers, and reduces interference. For more information about DTX, please click here.

AMR MP3 Converter supports the following encoding parameters for AWB.

• Bit Rate: supports 6.60 kbps, 8.85 kbps, 12.65 kbps, 14.25 kbps, 15.85 kbps, 18.25 kbps, 19.85 kbps, 23.05 kbps, and 23.85 kbps.
• Enable DTX: Discontinuous transmission (DTX)

AMR MP3 Converter supports the following encoding parameters for AAC.

• Average Bit Rate (ABR): supports 16 kbps, 24 kbps, 32 kbps, 40 kbps, 48 kbps, 56 kbps, 64 kbps, 80 kbps, 96 kbps, 112 kbps, 128 kbps, 144 kbps, 160 kbps, 192 kbps, 224 kbps, 256 kbps, and 320 kbps.
• Variable Bit Rate (VBR): supports quality value from 10 to 500. The bigger value, the better sound quality, and the larger file size.

And, AMR MP3 Converter supports the following advanced options for professional users.

• Use Temporal Noise Shaping (TNS): default value is OFF
• Allow Mid/Side: default value is ON
• MPEG Version: default value is MPEG4. The MPEG4 is recommended. As non-standard compliant players like QuickTime 6 only support MPEG4. However, Philips Expanium users should choose MPEG2. As their CD portable does not know MPEG-4 AAC files.
• Block Type: default value is "Both long and short"

Similar to AAC file except MPEG Version.

It's easy by AMR MP3 Converter. Just set an option before converting.

1. Output as MP3: Click "Options" -> "MP3 Options" tab - > "Sound" section, check "Amplify / Reduce sound" and set a coefficient. The coefficient value is described below.
   • < 100% - Reduce sound
   • = 100% - No changes
   • > 100% - Amplify sound
   For example:
   
   • 50%: Reduce sound to half of original audio
   • 200%: Double sound of original audio
2. Output as WAV: Similar to MP3, just click "WAV Options" tab instead.
3. Output as OGG: Similar to MP3, just click "OGG Options" tab instead.
4. Output as AMR/AWB: Similar to MP3, just click "AMR Options" tab instead.
5. Output as AAC: Similar to MP3, just click "AAC Options" tab instead.
6. Output as MP4/M4A/M4B: Similar to MP3, just click "MP4/M4A/M4B Options" tab instead.

Click "Options" -> "MP3 Options" or "MP4/M4A/M4B Options" tab -> "ID3 tag" section and check "Add ID3 tag", and then click "Edit ID3 tag" button below to edit the custom ID3 tag information.

At "Title" field, if you check "Name as file name (not include extension)", AMR MP3 Converter will set Title as file name when converting. For example: original file name is "Happy New Year.mp3", and then the title will be set as "Happy New Year" automatically.

Yes, it is. You may click "Options" -> "General Options" tab -> "Output" section, choose "A custom folder" at "Output folder" combo-box and click "Browse" button to choose an output folder.

Yes, it is. Similar to question above, but you should check "Create folders according to path of original file", thus AMR MP3 Converter will create folders according to path of source file automatically when converting.

For example: Original file is "C:\Music\pop\test.amr" and output folder is "D:\Output." If the option is checked, the output folder will be "D:\Output\C\Music\pop."

First, split the left channel.

1. Set output channel to mono at MP3 or WAV Options
2. Check "L channel" at Options -> General tab -> "If output channel is set to mono and the original file is stereo, output sound equals to"
3. Convert to MP3 or WAV

Then, split the right channel, similar to instructions above, just check "R channel" at step 2.

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You will receive an email confirming your order shortly after placing an order. Then, within 24 hours, you will receive the second email with your registration code, and instructions to get started!

Please send your additional questions to support@amr-mp3.net.