
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Transcribed Image Text:The image presents a signal processing problem involving a continuous-time (CT) linear time-invariant (LTI) system. The problem involves determining which plot correctly represents the output signal \( y(t) \).
### Description:
1. **Input Signal \( x(t) \):**
- The input is depicted as an impulse train with impulses located at \(-2T, -T, 0, T, 2T, \ldots\).
- Each impulse has an amplitude of \( A \).
2. **System Characteristics:**
- The system is described as a CT LTI system with a frequency response \( H(j\omega) \).
- The frequency response is a rectangular function centered around zero frequency, spanning from \(-\frac{3\pi}{T}\) to \(\frac{3\pi}{T}\).
3. **Diagram:**
- **Block Diagram:** Shows \( x(t) \) as input to the LTI system with the output as \( y(t) \).
### Task:
- Determine which plot (a) to (f) represents the output \( y(t) \).
### Plots:
- **a)** An impulse train with impulses at \(-T, 0, T, \ldots\) and amplitude \(\frac{A}{T}\).
- **b)** A continuous waveform oscillating sinusoidally between \(-\frac{A}{T}\) and \(\frac{A}{T}\), zero at intervals of \(T\).
- **c)** An impulse train similar to (a) but starting from \(0\).
- **d)** A sinusoidal waveform with higher frequency and amplitude spikes at integer multiples of \(T\).
- **e)** Another sinusoidal waveform, oscillating between \(-\frac{A}{T}\) and \(\frac{A}{T}\), showing three cycles over one interval.
- **f)** A constant line at amplitude \(\frac{A}{T}\).
### Graphical Explanation:
- The frequency response \( H(j\omega) \) indicates that the system acts as a low-pass filter, allowing frequencies contained within the range of \(-\frac{3\pi}{T}\) to \(\frac{3\pi}{T}\).
- The choice of the correct output plot \( y(t) \) will depend on the filtering effect on the spectral components of \( x
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