Bandwidth of a Voice Circuit
Difference between the highest and lowest frequencies in a band or set if frequencies
Human hearing frequency range: 20 Hz to 14 kHz
- Bandwidth = 14,000 – 20 = 13,800 Hz
Voice circuit frequency range: 0 Hz to 4 kHz
- Designed for most commonly used range of human voice
Phone lines transmission capacity is much bigger
- 1 MHz for lines up to 2 miles from a telephone exchange
- 300 kHz for lines 2-3 miles away