| 摘要 |
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 receives a sequence of data pulses and produces a data-pattern-dependent input signal. A signal channel circuit, responsive to the input signal, produces a data-pattern-dependent detected signal. Regeneration circuitry, responsive to the input signal, produces a regenerated data-pattern-dependent output signal. A reference channel circuit, responsive to the output signal, produces a data-pattern-dependent reference signal. A circuit algebraically combines the detected signal with the reference signal to form a continuously-variable data-pattern-independent gain control signal which is applied to the adjustable gain circuit for controlling the gain thereof.
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