The use of multiple sampling rates offers many advantages , such as reducing computational complexity for a given task , speeding up transmission rate , and / or raising storage capacity . so the applications of multirate digital filter technology have been found in subband coding of images and speeches , communications , and in many other fields 由于多速率數(shù)字濾波技術(shù)可有效地降低信號的處理復(fù)雜度、加快數(shù)據(jù)的傳輸率和提高存儲量等,所以它在圖像編碼、語音編碼及通信等眾多領(lǐng)域具有廣泛的應(yīng)用。