Alternating Current

• An audio speech signal is the sum of sinusoids of a range of frequencies (20Hz – 20kHz) and differing amplitudes
• For speech, frequencies in the range from 300Hz to around 2.7kHz make a significant contribution to intelligibility and the signal is tailored to this range for amateur use to conserve bandwidth

Course Guide Topics

1. Sinusoidal Signals (1)
2. Sinusoidal Signals (2)
3. Sinusoidal Signals (3)
4. Alternating Current
5. Phase
6. Harmonics
7. Non-Sinusoidal Signals (1)
8. Non-Sinusoidal Signals (2)
9. Capacitive Reactance (1)
10. Capacitive Reactance (2)
11. Inductive Reactance