Patents by Inventor William I. Chen

William I. Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Regenerator having automatic gain control referenced to a data-pattern-dependent pulse stream
    Patent number: 4175213
    Abstract: 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.
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: November 20, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: William I. Chen