Real world Signal
Is an analog signal defined as a sound wave or temperature. Infinitely complex and continuous.
Digital signal
Digital signal defined by bits or to be more specific 1’s and 0’s. It’s finite and discrete.
What is noise?
Noise is defined by any electrical fluctuations that interferes with a desired signal. For example if you want the signal from a microphone (dB) but there’s too much white noise, the white noise is the noise in this instance. Noise however isn’t actually physical noise, but a form of interference.
What is the weakness in analog signals and a weakness with digital signals?
Analog signals are susceptible to noise for ex temperature’s are susceptible to noise such as radiation.
Digital signals don’t have a weakness since have a high noise immunity and are extremely precise versions of analog signals.
What are the four quadrants
Continuous amplitude Discrete
Analog
C.T Analog Quantized Analog
D.T Sampled analog Digital
Continuous amplitude
A signal where the amplitude can be divided up into an infinite number of amplitude levels
Discrete amplitude
Y axis cannot have a multitude of amplitude levels, unless also has a discrete timing which would mean it’s digital
Analog signal
Continuous is both amplitude and time
Sampled analog
Continuous in amplitude but discrete in time ex specific intervals
Quantized analog
Discrete in amplitude but continuous in time. Has stairscase like levels
Digital signal
Discrete in amplitude and time, amplitude represented by dots, and time by bits.
How do you convert from analog to digital?
You sample, quantize, then encode it.
To sample what does the frequency need to be?
The frequency must be greater than the maximum frequency of the signal we want to sample.
