מכללת BITLEE. קורס DSP יישומי לתעשיה. DSP- D igital S ignal P rocessing. FROM ANALOG TO DIGITAL DOMAIN. 25 March 2004. TOPICS. Analog vs. digital: why, what & how What is DSP? What is DSP used for? Speech & Audio processing Image & Video processing Adaptive filtering
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קורס DSP יישומי לתעשיה
25 March 2004
Digital Signal Processing (DSPing)
SoftwareDSPing: aim & tools
Digital Signal Processing – the processing or manipulation of signals using digital techniques
Digital Signal Processor
Analogue to Digital Converter
Digital to Analogue Converter
…And much more!
DSP Technology & Markets
Ex: train wheels in a movie.
25 frames (=samples) per second.
Train starts wheels ‘go’ clockwise.
Train accelerates wheels ‘go’ counter-clockwise.
*Sampling: independent variable (ex: time) continuous discrete.
Quantisation: dependent variable (ex: voltage) continuous discrete.
Here we’ll talk about uniform sampling.Sampling
How fast must we sample a continuous signal to preserve its info content?
Frequency misidentification due to low sampling frequency.
f1Generalized Sampling Theorem
Condition on fS?
fS > 300 Hz
F1=25 Hz, F2 = 150 Hz, F3 = 50 Hz
fMAXThe sampling theorem
A signal s(t) with maximum frequency fMAX can be recovered if sampled at frequency fS > 2 fMAX .
*Multiple proposers: Whittaker(s), Nyquist, Shannon, Kotel’nikov.
Nyquist frequency (rate) fN = 2 fMAXor fMAXor fS,MINor fS,MIN/2
Different applications have different needs.
Imaging / video
NB: Definitions may be slightly manufacturer-dependent!(Some) ADC parameters
_ Telephone speech bandwidth 300hz-3.4khz
_Sound is audible in 20 Hz to 20 kHz range:
Ear + brain act as frequency analyser: audio spectrum split into many narrow bands low-power sounds detected out of loud background.