Audio Codecs

Supported Audio Codecs

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, 8-bit, Mono, 7 kbps
9.600 kHz, 8-bit, Mono
11.025 kHz, 8-bit, Mono, 10 kbps
CCITT u-Law Same as the CCITT A-Law codec, but provides compatibility with standards used in North America. 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-oriented sound. GSM provides 320:33 (approx. 9:1), real-time compression. GSM conforms to 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 with high bit rate content. IMA ADPCM provides fast 4:1 compression. 7.200 kHz, 4-bit, Mono
8.000 kHz, 4-bit, Mono, 3 kbps
9.600 kHz, 4-bit, Mono
11.025 kHz, 4-bit, Mono, 5 kbps
PCM The Pulse-Code Modulation (PCM) provides uncompressed audio for higher bit rate content. With PCM, you receive the best possible sound quality. 7.200 kHz, 8-bit, Mono
7.200 kHz, 16-bit, Mono
8.000 kHz, 8-bit, Mono, 7 kbps
8.000 kHz, 16-bit, Mono, 15 kbps
7.200 kHz, 8-bit, Mono
9.600 kHz, 16-bit, Mono
11.025 kHz, 8-bit, Mono, 10 kbps
11.025 kHz, 16-bit, Mono, 21 kbps
Rockwell ADPCM The Rockwell ADPCM codec is designed for Rockwell hardware. This ADPCM codec offers high quality, real-time compression with high bit rate content. 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 with high bit rate content. 4-bit codec provides fast 4:1 compression. 7.200 kHz, 4-bit, Mono
8.000 kHz, 4-bit, Mono, 3 kbps
9.600 kHz, 4-bit, Mono
11.025 kHz, 4-bit, Mono, 5 kbps

Configuration Overview