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Flussdiagrammknoten
- Signals Basics
- Signal
- Information
- Created when a value changes with time
- Created when a signal changes in an unpredictable way
- Side Notes
- An electrical/electronic circuit is some sort of signal processor
- Any value that changes as a function of time
- A switch can create a signal
- The Unit Step can represent this simple signal
- There's an infinite number of signals
- Some aspects of signals - can be used to classify them
- Amplitude
- Mean value (might be zero)
- Root mean square value (will not be zero)
- Number of zero crossings per unit time
- Related to frequency
- Important
- Electronic devices take an input signal and change it in some way
- Examples:AmplificationRectificationFiltering
- Fundamental Signal Classifications
- Continuous Signal
- Has a value at every point in time
- Discrete Time Signal
- Has a value at distinct points in time
- T is the time between the signal values (not the time period) in this case
- Signals can be created by summing other signals
- Simple signals, such as sine waves, are added to create more complicated wave-forms - information signals (maybe)
- Adding continuous signals
- Adding discrete time signals
- Periodic
- Random
- Non-periodic, Not Random
- Values are repeated at regular intervals (periods)
- Random value (can't be determined) at any point in time
- Values are not repeated periodically and are not random
- T = Period
- Continuous Signals
- Random Signal
- Discrete Random Signals
- Non-Periodic, Not Random Signal
- Odd
- Even
- x(t) = x(-t)
- x(t) = -x(-t)
- Symmetric
- Anti-symmetric
- (Cosine Wave)
- (Sine Wave)
- Signal Symmetry
- Product Rule
- ODD . ODD = EVENEVEN . EVEN = EVENEVEN . ODD = ODDODD . EVEN = ODD
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