REGENERATOR HAVING AUTOMATIC GAIN CONTROL REFERENCED TO A DATA-PATTERN-DEPENDENT PULSE STREAM

14. REGENERATOR HAVING AUTOMATIC GAIN CONTROL REFERENCED TO A DATA-PATTERN-DEPENDENT PULSE STREAM 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 datapattern-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 datapattern-dependent reference signal. A circuit algebraically combines the detected signal with the reference signal to form a continuously-variable datapattern-independent gain control signal which is applied to the adjustable gain circuit for controlling the gain thereof.