Digital Signal Processing Exam
Questions and Answers 100% Solved |
Graded A+
Analogue vs. Digital Signals - ✔✔Auditory perception = analogue signals
stimulating the auditory system
Digital signals = electronic equipment
Main difference = continuity
-analogue signals are continuous and defined at every instant in time
-digital signals are discrete and defined at only certain instances in time
Advantages of digital signals - ✔✔- immune to degradation when copied
- easier to apply signal processing
- easier to store
Analogue to Digital Conversion and Reconstruction (ADC) - ✔✔Analog
input (sound)
ADC (sampler, discrete-time signal, quantizer)
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, DSP (digital input to digital output - compression, wind noise filter, adaptive
microphones, etc.)
Reconstruction (DAC to low-pass filter)
Analog output
Sampling - ✔✔The first process in acquiring a digital signal
- measuring and storing the values of an analogue signal
- Obtained at regular rate as defined by the frequency (fs)
- Each time value associated with each sample can be calculated by
knowing then the period (ps=1/fs)
- Are "held" through the sample period
Sampling Process - ✔✔Produces a spectrum that repeats regularly
- Additional frequency components are introduced into the signal as a result
- The frequency components occur in a regular fashion and are "reflected"
about the y-axis (negative frequencies)
Sampling: Nyquist Theorem - ✔✔During reconstruction, typically filter out
the repeated versions of the spectrum
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Questions and Answers 100% Solved |
Graded A+
Analogue vs. Digital Signals - ✔✔Auditory perception = analogue signals
stimulating the auditory system
Digital signals = electronic equipment
Main difference = continuity
-analogue signals are continuous and defined at every instant in time
-digital signals are discrete and defined at only certain instances in time
Advantages of digital signals - ✔✔- immune to degradation when copied
- easier to apply signal processing
- easier to store
Analogue to Digital Conversion and Reconstruction (ADC) - ✔✔Analog
input (sound)
ADC (sampler, discrete-time signal, quantizer)
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, DSP (digital input to digital output - compression, wind noise filter, adaptive
microphones, etc.)
Reconstruction (DAC to low-pass filter)
Analog output
Sampling - ✔✔The first process in acquiring a digital signal
- measuring and storing the values of an analogue signal
- Obtained at regular rate as defined by the frequency (fs)
- Each time value associated with each sample can be calculated by
knowing then the period (ps=1/fs)
- Are "held" through the sample period
Sampling Process - ✔✔Produces a spectrum that repeats regularly
- Additional frequency components are introduced into the signal as a result
- The frequency components occur in a regular fashion and are "reflected"
about the y-axis (negative frequencies)
Sampling: Nyquist Theorem - ✔✔During reconstruction, typically filter out
the repeated versions of the spectrum
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
