Tonmind IP Speaker supports 48K Opus codec, which is not featured by other brand Sip Speakers in market including 2N and Axis. Opus can reduce bandwidth to most extent while ensuring extremely high sound quality.

Opus is an audio coding format developed by the Xiph.Org Foundation, designed to efficiently code speech and general audio in a single format, while remaining low-latency enough for real-time interactive communication. Opus Primarily starts with a combination of the SILK voice codec for Skype's early Internet calling and Xiph.org's CELT music codec. It's designed to transmit voice over the web and audio streams for VOIP, video conferencing, in-game chat and other applications, and is considered superior in quality to existing proprietary audio codecs. After many comparative tests, Opus beat the once superior HE AAC at low bitrate, and it is now match for AAC with about 30% higher bitrate, while high bitrate is closer to raw audio encoding.As an open format standardized throughIETF (RFC 6716), a reference implementation called libopus is available under the New BSD License. Now Opus has been added to the WebRTC project along with G.711 codec to enable browsers to communicate.

Features:

Sampling rates from 8 to 48 kHz
Bit-rates from 6 kb/s 510 kb/s
Support for both constant bit-rate (CBR) and variable bit-rate (VBR)
Audio bandwidth from narrowband to full-band
Support for speech and music
Support for mono and stereo
Frame sizes from 2.5 ms to 60 ms
Good loss robustness and packet loss concealment (PLC)
Floating point and fixed-point implementation

Thanks to the application of Opus, Tonmind Network Speakers transmit excellent sound quality. For more details of Tonmind IP Speakers, click product details page here or contact us via sales@tonmind.com