Audio processing using Matlab Elena Grassi. Sampling Read values from a continuous signal Equally spaced time interval (sampling frequency)

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Presentation transcript:

Audio processing using Matlab Elena Grassi

Sampling Read values from a continuous signal Equally spaced time interval (sampling frequency)

A/D (analog in/digital out) AI = analoginput('winsound'); addchannel(AI,1); set(AI,'SampleRate',44100) set(AI,'SamplesPerTrigger',4*44100) set(AI,'TriggerType','Manual') start(AI) trigger(AI) data = getdata(AI); delete(AI), clear AI

Spectrogram Short time Fourier transform Tradeoff frequency/time resolution. Note: dB= 20*log10 () specgram(y, 256, fs) title('Spectrogram [dB]')

D/A (digital in/analog out) AO = analogoutput('winsound'); addchannel(AO,1); set(AO,'SampleRate',22050) set(AO,'TriggerType','Manual') putdata(AO,x) start(AO) trigger(AO) waittilstop(AO,5) delete(AO), clear AO

Aliasing When sampling is too slow for a signal’s BW, high frequency content cannot be observed and it leaks into lower frequencies, thus distorting the signal. Minimum sampling required to capture the signal accurately: Nyquist frequency= 2*BW If not possible, apply antialiasing filter.

Filters Modify frequency content of signals. Classification according to their pass/stop bands: Lowpass (smoothing filter) Highpass Bandpass Stopband Specify corner frequency(ies), normalized wrt ½ sampling frequency. Example: 2000/(fs/2) for 2000 Hz.

Example

Filter Types Classification according to their roll-off, flatness, phase: Bessel: linear phase, preserves wave shape. Butterworth: flat and monotonic, sacrifice roll-off steepness. Chebyshev I: equiripple in passband and monotonic in stopband. Chebyshev II: monotonic in passband and equiripple in stopband, roll off slower than type I.

Example [b,a]= butter(6,2000*2/fsi,'low'); b= numerator polynomial in z a= denominator polynomial in z order corner freq sampling freq

Filter frequency response h= impz(b,a,N); H=(abs(fft(h))); fscale= fsi/N*(1:N/2); plot(fscale,H(1:N/2),'r') xlabel('f [Hz]') title('Filter frequency response')

Filter order Related to complexity (hardware or numerical) and how many samples of data are used. Higher order Steepness Trade off with complexity/numerical stability