Designing Software for Mobile VoIP and Video. Fred Wydler VP VoIP Products SPIRIT DSP
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2 Designing Software for Mobile VoIP and Video Fred Wydler VP VoIP Products SPIRIT DSP
3 Company background SPIRIT is voice and telecom experience 10 years in global voice software business 200+ first-class customers, largest OEMs 100+ million embedded voice channels powered SPIRIT DSP is a member of major voice-related developer communities and partnerships Preferred audio/voice software partner for ARM Intel, TI, Radvision,etc. Awards: 3
4 Converged device > 1.2B Units of various mobile phones in 2010 Fancy gadgets <$300 VoIP: no international cell roaming fees Rich user experience Inter-operable with PCs Video Single pocket device (cordless + cell phone + PMP) Engines to be integrated into a converged device: Voice (VoIP) Video 4
5 New approach to V2oIP enabling Converged platform Target: video telephony, IP-STB, media centers, PMP and more Convergence of different applications into one product Complete ecosystem (H/W reference designs, frameworks and drivers, software for DSP and media processing) 5
6 Complete converged platform SPIRIT voice and video engine completes a converged platform Application-friendly API: easy integration Complete media processing functionality: only GUI needed Pre-integrated solution: faster time to market IMS-ready solution 6
7 Application enabling Converged platform adds voice functionality to any application IMS VoIP over WiFi/WiMax 3G Converged Platform Voice&Video Engine? Gaming 7
8 Technical challenges High quality voice and video Voice enhancement Seamless video Resource efficiency System resource management Hardware accelerators for reasonable video framerate Stable performance in wireless networks Network optimization tools to handle WiFi-specific network impairments 8
9 Complete voice and video engine Components SPIRIT proprietary speech codec Multiple codec standards supported Clear echo- and noise-free voice Engine features Robustness to poor networks System resource optimization Network payload optimization Seamless and smooth video Different call scenarios Support for external codecs Solution Components: Voice and Video codecs - all standard G.xx, H.xx codecs, plus IP-optimized wideband speech codec IP-MR RealDuplex - sophisticated speech enhancement solution with AEC and noise suppressor NetJet - Network payload management with adaptive jitter buffer and error correction mechanism 9
10 Why engine Only engine can manage CPU load run all components together optimize channel workload handle packet losses synchronize voice and video minimize resource consumption 10
11 Voice enhancement the quality of user experience acts as a key differentiator and an important tool to attract and retain customers. Manjula Talreja, Voice Technology Group, Cisco 4.4 Voice Quality, PESQ MOS SPIRIT IP-MR isac G Wideband AEC and voice enhancements Wideband IP-optimized speech codec (scalable, robust, with smart multiplexing) Wideband adapted algorithms 3.4 SPEEX WB Bit rate, kbps 11
12 How to make a good video? Codec only compresses video with plenty of modes and options It should be managed correctly Issues Packet losses Narrow bandwidth Limited system resources Video degradation Frame drops Lost blocks Lost sync Low frame rate Solutions Redundancy control Video PLC Automatic rate selection Lip sync CPU load control 12
13 Hardware accelerators for video Standard integration (OpenMAX ) Custom integration Already deployed by: VoIP Application Layer TeamSpirit Mobile Voice + Video Engine Thin Layer Hardware Accelerator MPEG.4 H.263+ G IM SIP/Session Manager H.264 AMR AEC IMS Client Content Sharing PoC Voice&Video Framework VoIP Speech Codecs NetJet (Jitter Buffer, PLC, clock drift adaptation) Presence Media Transport (RTP/RTCP/SRTP) Audio/Video Synchronization DTMF CPU Load Control Video RTP Packetizers RealDuplex (Speech Enhancement) 13
14 Network optimization Issues Delays Jitter Packet loss Congestion Synchronization losses Solutions WiFi adaptation Adaptive jitter buffer Packet loss concealment Automatic rate selection Lip-sync 14
15 Looking for the Best Quality VoIP? Think of SPIRIT as your solution vendor! Checklist items Delay time <170ms Voice quality MOS-LQO 4.21 WiFi adaptation 15
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