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Guarantee quality in voice engine design

Posted: 16 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:SoC? telephones? communication devices? software DSP? VoIP?

The general purpose SoCs used by today's cordless or IP phones, integrated access devices and wireless unified communications devices, fully support the software DSP (soft-DSP) required for VoIP by integrating a software voice engine within the system software. Voice engines fit within an embedded processor's system performance capabilities using soft-DSP implementation techniques, and to guarantee telephony-quality voice performance for VoIP, the system software must meet the real-time requirements of the voice engine.

Next-generation soft-DSP products that incorporate both real time processing and wideband (high definition) voice communication achieve greater end user satisfaction and market potential than current technology. These products set a new high-definition standard for voice communication. This article discusses how to integrate a voice engine for soft-DSP processing in order to exceed telephony quality communication. Conversely, failure to meet the real-time requirements may cause many symptoms of poor voice quality, including voice dropout, noticeable delay, pops or clicks, fax/modem call failure or corrupt fax pages, incomprehensible speech due to packet loss or excessive delay etc.

Failure to meet real-time requirements results in a missed deadline; this may be a critical system failure requiring a full system reset, unless the system supports recovery in hardware and software.

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