8 CLAIMS

• 1. An active control system adapted to provide control to at least one house appliance to be quieted through the power connection, said system comprising
• an active noise control means associated with a power distribution network,
• at least one appliance means to be quieted, and
• a power connection means comprising a dual frequency modulation means between said control means and said appliance means adapted to convey noise control signals from said control means to said appliance means and a residual noise signal from said appliance back to said control means.
• 2. An active noise control system as in claim 1 wherein said power connection means includes a power cord with wire means to carry said signals.
• 3. An active noise control system as in claim 1 wherein the appliances are telephones.
• 4. An active noise control system as in claim 1 wherein said appliance means comprises a sub-circuit adapted to provide a signal representing the result of merging the noise signal to be attenuated with the anti-noise signal.
• 5. An active noise control system as in claim 4 wherein said sub-circuit includes a residual microphone, separation filter means, a demodulator means, an anti-noise amplifier and an anti-noise speaker.
• 6. An active noise control system as in claim 5 also including a microphone preamplifier means, low pass filter means and a modulator means.
• 7. An active noise control system as in claim 1 wherein said active noise control means includes an analog to digital conversion means, a digital to analog conversion means and a separation filter means.
• 8. An active noise control system as in claim 7 and wherein said active noise control means additionally includes filter means, modulator means and demodulator means.