amr4.7 KB
AMR — Narrowband Speech
The clip resampled to 8 kHz mono and encoded as AMR narrowband — the telephony/voice-note codec. For testing AMR decoding and speech-codec conversion.
Rendered preview of the amr file (4.7 KB). Download above for the original.
Specifications
- Source
- 3 s A-major triad, 44.1 kHz stereo
- Codec
- AMR-NB
- Sample Rate
- 8 kHz mono
- Lossless
- false
What is a .amr file?
AMR (Adaptive Multi-Rate) is a lossy speech codec optimized for narrowband human voice at very low bitrates, widely used in GSM and UMTS mobile telephony. It is efficient for spoken audio but poor for music. It commonly appears in voice recordings and MMS messages.
How to use this file
Use an example AMR to test speech-codec decoding, voice-recording import, and transcoding of low-bitrate mobile audio to more portable formats.
Related files
- aiffAIFF — 1 kHz Sine ToneA pure 1 kHz sine tone stored as AIFF — Apple's big-endian 16-bit PCM container, 3 seconds, 44.1 kHz mono. A clean reference for testing AIFF decoders and WAV↔AIFF conversion.
- aiffAIFF — 440 Hz Sine ToneA pure 440 Hz sine tone stored as AIFF — Apple's big-endian 16-bit PCM container, 3 seconds, 44.1 kHz mono. A clean reference for testing AIFF decoders and WAV↔AIFF conversion.
- auAU — 1 kHz Sine ToneA pure 1 kHz sine tone stored as a Sun/NeXT AU file — big-endian 16-bit PCM, 3 seconds, 44.1 kHz mono. A compact reference for AU decoding and format conversion.
- auAU — 440 Hz Sine ToneA pure 440 Hz sine tone stored as a Sun/NeXT AU file — big-endian 16-bit PCM, 3 seconds, 44.1 kHz mono. A compact reference for AU decoding and format conversion.
- wav1 kHz Sine ToneA pure 1000 Hz sine tone, 3 seconds, 16-bit 44.1 kHz mono — a clean reference signal for level metering, spectrum analysis, and waveform rendering.
- wav220 Hz Sine ToneA pure 220 Hz sine tone, 3 seconds, 16-bit 44.1 kHz mono — a clean reference signal for level metering, spectrum analysis, and waveform rendering.
Generated by generation/audio_codecs.py. Free for any use, no attribution required — license.