High-quality voice processiong software library eSound

eSound™ engine for PC

Voice signal processing library for VoIP applications operating on a PC such as a soft phone, etc.


Voice codecs G.722, AMR-WB, G.711, G.729a, AMR-NB, and others
Packet interval 10ms-120ms
Quality of service ToS field setting
Jitter buffer controller Dynamic/Static
RTP/RTCP RFC1889/1890
Packet loss concealment packet loss concealment for any codecs
Echo canceller Cancel the echo by PC sound board
Outband DTMF RFC2833
Inband DTMF (send only)
Gain control Gain control by signal processing
Recording WAV format
Playing WAV format
Level indicator Output to real time at the interval which specified the voice level.
Conference Automatic mixing control handling multi-codec
Statistical information collection Information about RTP packet loss, jitter etc.
Statistical information transmission RTCP XR(RFC3611)


CPU Pentium3 800MHz over
Memory 256MB over
OS Windows XP, 2000, Vista
Sound device AC97 Compliant, HD-Audio Compliant


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