روش تفريق طيفی چندباندی اصلاح شده برای بهبود صحبت
الموضوعات :مهدی بکرانی 1 , هادی صدوقی یزدی 2
1 - دانشگاه تربیت مدرس
2 - دانشگاه تربیت معلم سبزوار
الکلمات المفتاحية: تفريق طيفی چندبانديبهبود صحبتنويز غيرايستانفاکتور فوقتفريقنويز موزيکال,
ملخص المقالة :
در اين مقاله يک روش اصلاح شدة تفريق طيفی چندباندی برای حذف نويز از سيگنال صحبت ارائه شده است. در اين روش با تخمين آمارگان نويز غيرايستان، تخمينی از SNR برای سيگنال صحبت بدست مي‌آيد که در ميانگين‌گيری وفقی از قابهای سيگنال صحبت بکار گرفته مي‌شود. همچنين با استفاده از آن يک فاکتور فوق‌تفريق بدست مي‌آيد که سبب کاهش قابل توجه نويز موزيکال مي‌شود. تنظيم پارامترهای الگوريتم نهايی بر اساس SNR بدست آمده انجام مي‌شود؛ بطوري‌که الگوريتم نهايی دارای حداقل نويز موزيكال و اعوجاج در سيگنال صحبت است. نتايج حاصل از معيارهای ايتاکورا-سايتو، SNR سراسری و SNR قطعه‌ای نشان مي‌دهد که الگوريتم پيشنهادی دارای سيگنال خروجی با کيفيت بهتری نسبت به دو الگوريتم تفريق طيفی چندباندی و نوع بهبوديافته آن مي‌باشد.
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