Provided is a method and system for audio privacy that includes receiving a first sound signal at a microphone proximal to a user’s ear, generating a second sound signal based on the first sound signal and a stored filter, the second sound signal interfering with the first sound signal, and emitting the second sound signal from a speaker proximal to the user’s ear. The connector is suitably designed both for assuring an electrical continuity between PCB and an external power supply and locking it in a slot formed on said main body. The fractional frequency multiplier utilizes a source and a combination of multipliers, dividers, and switches to generate and select among different frequencies. The disc playback apparatus allows a user to readily grasp the content of the DVDs loaded therein. The present invention is applicable to a server.