شکل‌دهی وفقی پرتو آکوستیکی با روش بهبودیافته تفاضلی
الموضوعات :
1 - دانشكده مهندسی برق و كامپيوتر، دانشگاه صنعتی قم، ایران
2 - دانشكده مهندسی برق و كامپيوتر، دانشگاه صنعتی قم، ایران
الکلمات المفتاحية: آرایه میکروفن, بهره نویز سفید, شکل‌دهی پرتو, فاکتور جهت‌دهی,
ملخص المقالة :
شکل‌دهنده‌های پرتو تفاضلی عملکرد مؤثری در کاربردهای پهن‌باند نظیر کاربردهای آکوستیکی دارند؛ اما دارای بهره نویز سفید محدودی هستند. در این مقاله به‌منظور بهبود بهره نویز سفید شکل‌دهنده پرتو تفاضلی، یک الگوریتم شکل‌دهنده تفاضلی بر مبنای وزن‌دهی وفقی ارائه شده که از روش شکل‌دهی پرتو پاسخ کمینه واریانس بدون اعوجاج (MVDR) بهره می‌گیرد. به این منظور، ابتدا شکل‌دهی پرتو تفاضلی در دو مرحله اجرا شده که در مرحله اول، تفاضل مکانی مشاهده‌ها به‌دست آمده و در مرحله دوم شکل‌دهنده پرتو بهینه گردید. سپس با محاسبه ضرایب و تلفیق شکل‌دهنده‌های پرتو تفاضلی و MVDR، شکل‌دهنده پرتو وفقی پیشنهادی به‌دست آمد. در شکل‌دهنده پیشنهادی، سهم روش تفاضلی و روش MVDR در ایجاد سیگنال خروجی توسط ضریب تلفیق وفقی که تابع فرکانس، فاصله بین میکروفن‌ها، زاویه هدف و تعداد میکروفن‌ها است، تعیین می‌گردد. شکل‌دهنده پرتو پیشنهادی با درنظرگرفتن چهار میکروفن و فاصله دو سانتی‌متری بین میکروفن‌ها منجر به بهبود بهره نویز سفید به مقدار 35 دسی‌بل و بهره SNR به مقدار 18 دسی‌بل نسبت به شکل‌دهنده پرتو تفاضلی در فرکانس 1 کیلوهرتز می‌شود. همچنین فاکتور جهت‌دهی در الگوریتم وفقی پیشنهادی به میزان 5/3 دسی‌بل نسبت به شکل‌دهنده پرتو تفاضلی بهبود پیدا کرده است.
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