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# Multirate Filtering: Introduction (Thai Version)

Summary: A sample-rate compressor removes (D-1) of every D input samples. A sample-rate expander inserts (U-1) zeros after every input sample.

## Introduction

ในแบบฝึกหัดนี้ คุณจะได้เรียนรู้เกี่ยวกับผลของการใช้ multirate processing โดยจะใช้ระบบใน Figure 1. sample-rate compressor ( D D ) ใน block-diagram จะทำการกำจัดค่า D1 D 1 ของทุกๆ D D input samples, ในขณะที่ sample-rate expander ( U U ) จะเพิ่มค่า U1 U 1 ศูนย์หลังจากทุกๆ input sample. โดยที่มี compression และ expansion factors set เป็นค่าเดียวกัน( D=U D U ), filters FIR 1 และ FIR 3 จะทำงานที่ sample rate F s F s , ขณะที่ filter FIR 2 จะทำงานที่ lower rate ของ F s D F s D .

ในภายหลัง คุณจะได้ implement ระบบและควบคุม compression และ expansion factors ในขณะ runtime ด้วย interface ที่มีให้ คุณจะสามารถทำการ disable filter ตัวใดตัวหนึ่งหรือทั้งหมดเพื่อทำการ ศึกษผลกระทบของ multirate. ให้ระบุว่า FIR 1และ FIR 3 ทำอะไร และผลจะเป็นอย่างไรถ้าไม่มี filter ทั้งสอง

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