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| Audio Codec | Description | Frequency/Sampling Rate |
|---|---|---|
| CCITT A-law | The International Telecommunications Union (ITU) CCITT A-law codec is supported by many hardware configurations and offers a 2:1 compression ratio (from 16 bits to 8 bits per sample). Also known as G.711. | 7.200 kHz, 8-bit, Mono 8.000 kHz, 9.600 kHz, 8-bit, Mono 11.025 kHz, |
| CCITT µ-law | Same as the CCITT A-law codec, but provides compatibility with North American standards. | Same as the CCITT A-law codec. |
| GSM 6.10 | The Groupe Spécial Mobile (GSM) codec is designed for the efficient compression of speech and is best for mid to high bit rate voice sound. GSM provides 320:33 (approx. 9:1), real-time compression. GSM is in compliance with the European Telecommunications Standards Institute recommendation 6.10. | 8.000 kHz, Mono, 1 kbps |
| IMA ADPCM | The Interactive Multimedia Association (IMA) ADPCM codec is designed for multiple hardware platforms and offers high quality real-time compression for higher bit rates. IMA ADPCM provides fast 4:1 compression. | 7.200 kHz, 4-bit, Mono 8.000 kHz, 9.600 kHz, 4-bit, Mono 11.025 kHz, |
| PCM | The Pulse-Code Modulation (PCM) provides uncompressed audio with best quality at cost of higher file size. | 7.200 kHz, 8-bit, Mono 7.200 kHz, 16-bit, Mono 8.000 kHz, 8.000 kHz, 7.200 kHz, 8-bit, Mono 9.600 kHz, 16-bit, Mono 11.025 kHz, 11.025 kHz, |
| Rockwell ADPCM | The Rockwell ADPCM codec is designed for Rockwell hardware. This ADPCM codec offers high quality real-time compression with low bit rate. | 7.200 kHz, 2-bit, Mono 7.200 kHz, 4-bit, Mono |
| ZyXEL ADPCM | The ZyXEL ADPCM codec is designed for ZyXEL hardware. This ADPCM codec offers high quality real-time compression for higher bit rates. 4-bit codec provides fast 4:1 compression. | 7.200 kHz, 4-bit, Mono 8.000 kHz, 9.600 kHz, 4-bit, Mono 11.025 kHz, |
codec
Short for compressor/decompressor. Codecs are various types of computer algorithms that are applied to audio, video, and image files to compress the size of the files. The benefit of this is the files do not use as much disk space when stored or bandwidth when streamed.
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