CT8022 Datasheet | DSP Group

PRELIMINARY/CONFIDENTIAL Version: 1.18 Data Sheet VOIP/VON G.723.1, G729AB TRUESPEECH® CO-PROCESSOR System Controller MODEM Data Pump DAA and Phone Interface Microphone & Speaker Interface Phone Line Hand/Head-set Microphone Speaker Video Sub-system CT8022 True Speech  Co-Processor SRAM CT8022 System Block Diagram DESCRIPTION The CT8022 is a speech co-processor which performs full-duplex speech pression and de-pression functions. It provides speech pression for H.323 and H.324 Multimedia Visual Telephony/Video Conferencing products and DSVD modems. The CT8022 has built-in True Speech 8.5 (patible with Microsoft Sound System 2.0, and a standard part of Microsoft Windows 95), and True Speech G.723.1 (for H.323 and H.324). This bination of ITU speech pression standards within a single device enables the creation of a single multimedia terminal, which can operate in all types of H.324 POTS-based and H.323 LAN/Internet-based Video Conferencing systems. True Speech G.723.1 provides pressed data rates of 8.5, 6.3 and 5.3 KBPS and includes G.723.1 Annex A VAD/CNG silence pression, which can supply an even lower average bit rate. The CT8022 provides two additional non-ITU True Speech data rates at 4.8 and 4.1 KBPS. The CT8022 also supports download of additional speech pression software modules to low-cost external memory (e.g. Flexi Speech, G.722 and G.729A/B). The CT8022 operates as a microprocessor peripheral device, and can co-exist with other devices such as modem data pump and video pression chipsets. In addition, the CT8022 includes built-in Acoustical Echo Cancellation, which plements the speech pression functions by providing concurrent hands-free operation. The True Speech G.723.1 algorithm delivers highly pressed speech without promising the speech quality. True Speech G.723.1 at the 6.3 bit-rate has a MOS score of 3.9 for use with the ITU H.324 and H.323 standards. CT8022A11AQC FW Revision 0118 DSP GROUP, INC.,...