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Echo cancellation on Cell Broadband Engine

Echo cancellation on Cell Broadband Engine. Jaromír Škorpil (skorpj1@fel.cvut.cz) Tomáš Uko (ukot1@fel.cvut.cz). Goal of project. To i mplement Echo cancellation on Cell Broadband Engine with using of parallerism which this architecture offers. Motivation.

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Echo cancellation on Cell Broadband Engine

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  1. IBM - CVUT Student Research Projects Echo cancellation on Cell Broadband Engine Jaromír Škorpil (skorpj1@fel.cvut.cz) Tomáš Uko (ukot1@fel.cvut.cz)

  2. Goal of project • To implement Echo cancellation on Cell Broadband Engine with using of parallerism which this architecture offers

  3. Motivation • Echo cancellation has many applications • Telecommunications - removing(reducing) of sounds in background during conversation • Hands-free car phone systems • Standard phone in speakerphone or hands-free mode • … • Sound systems - Microphone – Reproductor back-coupling • CELL implementation offers possibility to compute more acoustic channels in parallel IBM - CVUT Student Research Projects 3

  4. Acustic echo IBM - CVUT Student Research Projects 4

  5. Structure of AEC IBM - CVUT Student Research Projects 5

  6. Main problems we had to solve • Double talk detection • SIMD implementation of adaptive filter on SPU • Implementation of DMA transfers for maximal data throughtput • Obtain test data IBM - CVUT Student Research Projects 6

  7. Implementation IBM - CVUT Student Research Projects 7

  8. Benefits of SIMD implementation of adaptive filter • 4 samples processed by single instruction in parallel IBM - CVUT Student Research Projects 8

  9. Project results • Working and tested SIMDized code of AEC for CELL SPU including DMA based data transfers • 60 seconds sample -> takes 2,6 seconds to compute (measured on Playstation 3) • NonSIMDized code working on CELL P(S)PU and other x86 platforms • 60 seconds sample -> takes 8,9 seconds to compute (measured on Playstation 3) IBM - CVUT Student Research Projects 9

  10. Future improvements • Direct connection with Soundcard • Real-time AEC • processing of multiple independent audio channels in parallel on multiple SPU (modification of PPU code is only necessary, SPU code remains the same) IBM - CVUT Student Research Projects 10

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