Echo cancellation on Cell Broadband Engine

IBM - CVUT Student Research ProjectsEcho cancellation on Cell Broadband Engine

Jaromr korpil ([email protected])Tom Uko ([email protected])

IBM - CVUT Student Research Projects

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Goal of projectTo implement Echo cancellation on Cell Broadband Engine with using of parallerism which this architecture offers

MotivationEcho cancellation has many applicationsTelecommunications - removing(reducing) of sounds in background during conversationHands-free car phone systemsStandard phone in speakerphone or hands-free modeSound systems - Microphone Reproductor back-couplingCELL implementation offers possibility to compute more acoustic channels in parallel


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Acustic echoIBM - CVUT Student Research Projects

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Structure of AECIBM - CVUT Student Research Projects

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Main problems we had to solveDouble talk detectionSIMD implementation of adaptive filter on SPUImplementation of DMA transfers for maximal data throughtputObtain test data


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ImplementationIBM - CVUT Student Research Projects

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Benefits of SIMD implementation of adaptive filter4 samples processed by single instruction in parallelIBM - CVUT Student Research Projects

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Project resultsWorking and tested SIMDized code of AEC for CELL SPU including DMA based data transfers60 seconds sample -> takes 2,6 seconds to compute (measured on Playstation 3)NonSIMDized code working on CELL P(S)PU and other x86 platforms60 seconds sample -> takes 8,9 seconds to compute (measured on Playstation 3)


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Future improvementsDirect connection with SoundcardReal-time AECprocessing 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

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Echo cancellation on Cell Broadband Engine

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