| 摘要 |
<p>A roving reference automatic gain control (AGC) arrangement is used in a regenerator of a pulse code modulation (PCM) transmission system. An adjustable gain circuit (40, 45) receives a sequence of data pulses and produces a data-pattern-dependent input signal (47, 48, 49). A signal channel circuit (55), responsive to the input signal, produces a data-pattern-dependent detected signal. Regeneration circuitry (50, 52), responsive to the input signal, produces a regenerated data-pattern-dependent output signal. A reference channel circuit (62, 65), responsive to the output signal, produces a data-pattern-dependent reference signal. A circuit (70) algebraically combines the detected signal with the reference signal to form a continuously-variable data-pattern-independent gain control signal which is applied (42) to the adjustable gain circuit for controlling the gain thereof. </p> |
