ee332 junior project sound recorder spring 2001 chris brophy matt olinger instructor: s. d....
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EE332 Junior ProjectSound Recorder
Spring 2001
Chris Brophy
Matt Olinger
Instructor: S. D. Gutschlag 4/26/01
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Block Diagram
•Top Down Design
•Sample input audio
•Store in memory (Emac board)
•Play audio output
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Audio Input
• Amplify microphone input
• Shift and Clip to protect A/D converter
• Sample input with software
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Microphone PreAmp
• Basic Op-Amp with feedback for simplicity
• Easily adjustable offset for A/D
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A/D Clipper Circuit
©2001 Brophy and Olinger
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Software
•For sampling, used Timer 0 Interrupt
•For REC/PLAY/STOP buttons, used EXT3,5,6
•For LEDs, used P1.6 and P1.7
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Software
Sample Rate
•Adjustable with T0
•Set to 6kHz for human voice
•Maximum necessary frequency is 3kHz
•Double for Nyquist Theorem
•32KB of memory
•Recording time of 5.3 seconds
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Square Wave Memory Dump
Sine Wave Memory Dump
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Audio Output
•“Unshift” Output of D/A•Amplify•Output on speaker
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Audio Output
Preliminary Speaker Amplifier
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Audio Output
Final Speaker Amplifier
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FFT
Due to sampling effect of A/D,results are similar to the PAM lab.
Aliasing effect is also seen past theNyquist Theory frequency limit.
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Conclusions and Performance
Audio Samples
•Test at 3.6kHz Sample Rate
•Test at 5.9kHz Sample Rate
•Test at 16.4kHz Sample Rate
All objectives were achieved:•Microphone input•Record into memory•Output through speaker