حذف پژواک آکوستيکي استريو با استفاده از فيلتر وفقي NLMS مبتني بر شبکه ناهمبستهساز MIMO
الموضوعات :
مهدی بکرانی
1
(دانشگاه تربیت مدرس)
مجتبی لطفي‌زاد
2
(دانشگاه تربیت مدرس)
الکلمات المفتاحية: آستانه عدم انطباق فيلتر وفقي سرعت همگرايي ناهمبسته‌سازي,
ملخص المقالة :
در يک حذف‌کننده پژواک آکوستيکي استريو وجود همبستگي متقابل شديد بين سيگنال‌هاي ورودي به دو کانال سيستم ارتباطي استريو سبب کندي قابل توجه سرعت همگرايي و همچنين عدم انطباق وزن‌هاي فيلترهاي وفقي با ضرايب پاسخ ضربه مسيرهاي آکوستيکي بخش گيرنده، حتي پس از اتمام دوره همگرايي ميگردد. در مقاله حاضر روشي براي بهبود عملکرد فيلتر وفقي NLMS بر مبناي کاهش همبستگي سيگنال‌هاي ورودي به کمک شبکه ناهمبستهساز چندورودي - چندخروجي ارائه شده است. ناهمبسته سازی در این روش به صورت غیرخطی بوده و در دو مرحله انجام می‌گیرد. نتايج شبيهسازيها نشاندهنده بهبود سرعت همگرايي فيلترها و کاهش قابل توجه حساسیت آنها به تغییر گوینده، با به‌کارگيري اين ساختار پيشنهادي ميباشد.
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