Noise reducing apparatus for minimizing noise in modems

Abstract

A noise reducing apparatus for minimizing spurious noise in a system utilizing a cable modem is provided. The noise reducing apparatus for reducing a noise generated according to operation of a modem includes a controlling unit for controlling the modem and producing an enable signal according to generation of the noise, a programmable gain controller for turning on/off a transmission level in response to the enable signal of the controlling unit, a noise removing unit for removing predetermined noise generated by the programmable gain controller when the modem does not transmit a signal, and a tuner for tuning the output of the noise removing unit to connect it to a coaxial cable network. Since a circuit comprised of gates and gallium arsenide integrated circuit single-pole double-throw switches is employed therein to minimize spurious noise when a cable modem does not transmit a signal, the quality in the communication between a cable modem and a headend can be ensured.

Dependencies are inferred from the claim text.