LAB4_02_16_2007

LAB4_02_16_2007 - ECE 3551 MICROCOMPUTER SYSTEMS 1 Lab...

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ECE 3551 MICROCOMPUTER SYSTEMS 1 Lab 4—Learn to process audio data OBJECTIVE: Learn how to process audio data in ADSP-BF533 EZ-Kit Lite. Learn how to design Infinite Impulse Response ( iir ) filters with MATLAB fdatool. Learn how to implement digital iir filter in DSP using: 32-bit floating point emulation 16-bit integer arithmetic 16-bit fractional arithmetic Learn how to control the audio input/output. Create the Project 1. Before power on the board , make sure that switch SW9 pin1,pin2, pin3, pin4, pin5 and pin6 are turned on., which means all pins in SW9 must be on. 2. Copy the project of the previous completed Lab #3 to your u-drive “u:\ece3551\labs\lab4”. Modify the Project In this lab, you need to learn how to filter audio data and compare the original audio and the filtered audio. In this Lab exercise only stereo input 1 and stereo output 1 will be used. Read the data from the input and save it’s copy: one is the original data and another will 1 2 3 4 5 6
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In the beginning, LED4 & LED5 are off, and the original data is send to output. So what is heard is the original audio. When PF8 is pressed: The LED4 should turn on, and The low-pass filtered data is send to output. What is heard therefore is filtered audio. By pushing PF8 again, the LED4 should turn off, and the original data is send to output; what is heard is the original audio again. When PF9 is pressed: The LED5 should turn on, and The high-pass filtered data is send to output. What is heard therefore is high-pass filtered audio. By pushing PF9 again, the LED5 should turn off, and the original data is send to output; what is heard is the original audio again. Designing IIR Filters: MATLAB exports IIR filters in a direct-form II sections each being of second order. The general relationship of output and input given in Z transform is of the form: ( 29 ( 29 ( 29 ( 29 = - - - - = + + + + = = = K k k k k k k K k k z a z a z b z b b G z H G z X z Y z H 1 2 2 1 1 2 2 1 1 0 1 1 Note that z -1 denotes unit delay D operator and z -2 , denotes 2 unit delays, i.e, D 2 . Y(z) is z- transform of the output, X(z) is z-transform of the input. The block diagram realization of a filter with K=2 sections is given below: Example of a fourth-order IIR filter realized by cascading of two bi-quads. d
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This note was uploaded on 02/10/2012 for the course ECE 3551 taught by Professor Staff during the Spring '11 term at FIT.

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LAB4_02_16_2007 - ECE 3551 MICROCOMPUTER SYSTEMS 1 Lab...

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