A noise reduction device for generating a delay frame by delaying an input frame in each frame, a first difference value between the delay frame and the input frame, a line delay frame by delaying the input frame in each line, and a second line delay frame by delaying the delay frame in each line. The signal layer includes a differential pair comprising two transmission lines to transmit a pair of differential signal. The clock frequency is selected among frequencies which are integer multiples of a reference frequency, in accordance with which frequency band of a standard is to be set for an oscillation output signal of the digital control oscillator unit. A sock aide is removably coupled to the reacher adjacent to the far end. Variations include feedback loop controllers and a combination feedback and feedforward loop controllers.