Noise suppression in coaxial cable

摘要

The transmission of electrical impuleses from a pick-up device to an amplifier is usually accomplished through a microphone cable, which has metallic braid shielding to eliminate spurious impulses. While this has been satisfactory in short lengths, the use of longer lengths has shown that pick-up of mechanical vibration or shock introduces serious problems where faithful transmission of the desired signal is a prime requisite. This is aggravated after severe abuse by the “noise” caused by broken strands of the shielding braid making intermittent contact.