Long description: zfig22

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• The top graph shows a frequency function, denoted as \(f(nT)\), plotted against time, \(t\).
• At \(t = T\), the function has a high value, represented by a tall bar.
• At \(t = 2T\), the function has a moderate, non-zero value.
• At \(t = 3T\), the function has a low, non-zero value.
• The horizontal axis is marked at intervals of \(T\), \(2T\), and \(3T\).
• The bottom graph shows another frequency function, denoted as \(f(nT - T)\), plotted against time, \(t\).
• At \(t = T\), the function has a high value, represented by a tall bar.
• At \(t = 2T\), the function has a high value, represented by a tall bar.
• At \(t = 3T\), the function has a moderate, non-zero value.
• At \(t = 4T\), the function has a low, non-zero value.
• Both graphs use the time axis \(t\) as the horizontal scale.