lecture08

lecture08 - out in v H v ϖ = = ( 29 ( 29 ( 29 10 60 10 60...

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BIEN 130: Bioinstrumentation L08 April 23, 2009 Hyle Park

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Fourier transforms Definition Go to matlab script 1 demonstrating FFT’s This is a better way to figuring out what periodic functions are in your waveform ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 1 2 1 1 2 j t j t v t V v t e dt V V t V e d ϖ π - - = = = = F ( 29 ( 29 ( 29 ( 29 0 0 0 2 cos t δ ϖ = - + +
Sampling rate / Nyquist theorem Go to matlab code

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Transfer functions If an input voltage waveform given by is fed into a filter with a transfer function given by Then what will the output voltage waveform be? ( 29 ( 29 ( 29 3cos 10 5cos 60 input v t t t = + ( 29 50 out in v H v ϖ = =
Transfer functions If an input voltage waveform given by is fed into a filter with a transfer function given by Then what will the output voltage waveform be? ( 29 ( 29 ( 29 3cos 10 5cos 60 input v t t t = + ( 29 50 out in v H v ϖ = =

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Transfer functions If an input voltage waveform given by is fed into a filter with a transfer function given by Then what will the output voltage waveform be? ( 29 10 60 3 5 j t j t input v t e e = + ( 29 50

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Unformatted text preview: out in v H v ϖ = = ( 29 ( 29 ( 29 10 60 10 60 3 5 50 50 j t j t output v t e e = + Transfer functions • If an input voltage waveform given by is fed into a filter with a transfer function given by Then what will the output voltage waveform be? ( 29 10 60 3 5 j t j t input v t e e = + ( 29 50 out in v H v ϖ = = ( 29 ( 29 ( 29 3 cos 10 6cos 60 5 output v t t t = + Sound analysis • Equalizers – Take sound, recorded as a function of time – Do an fft – Enhance or decrease wavelength ranges – Inverse fft – Play back sound • Voice analysis/modulation – How? Presentation • Topic related to bioinstrumentation or related concepts • Can work in groups, but everybody must present something • Submit an abstract by May 6, 2009 in class with full author list...
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This note was uploaded on 02/17/2010 for the course BIEN 130 taught by Professor Park during the Spring '10 term at UC Riverside.

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lecture08 - out in v H v ϖ = = ( 29 ( 29 ( 29 10 60 10 60...

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