| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
As fast convergence algorithms for stereophonic acoustiv echo cancellation, two pre-processing filters are studied. In pre-processing filters using multiple all-pass filters (APFs), the anglular frequency and the radius of the pole periodically controled one after the other. Pre-processing filters using multiple FIR filters are also studied. Sub-sample inter-channel delay difference maximizes the convergence speed. Combination with non-linear pre-processors are also examined. Subjective test results show the improved sound quality. Parallel and effective implementation of echo cancellers by using CUDA or OpenCL is also studied.
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