A flexible, module-based SoC-approach for low-power VoIP-applications

A system on chip (SoC) is presented, which is suitable for both conventional telephony via the public switched telephone network (PSTN) and voice over Internet protocol (VoIP). A highly flexible approach offers the possibility to integrate several interface types, customizable by software download. Additional download capabilities facilitate the integration of voice-codecs for voice compression, algorithms for silent noise injection, far end line echo cancellation, and fax/modem termination. The modular design style allows reuse of all major building blocks in future systems. The modular test concept enables separated tests for all parts of the chip as well as configurable self tests for easy go/no go-decisions.