Abstract: Apparatus for simulating a candle flame in which the current through the filament of a bulb is varied from a first value to a second value and back to the first value during spaced periods that vary from a period of maximum duration to a period of minimum duration that produces no observable flicker in an apparently random manner.

Abstract: A power controller having first and second power outlets, connections between one side of an A.C. line to one side of each outlet, a current sensing impedance connected between the other side of the A.C. line and the other side of the first power outlet, a triac connected between the other side of the A.C. line and the other side of the second power outlet, a first operational amplifier normally maintaining the triac in a non-conductive condition and a second operational amplifier to cause current to flow through the triac to the second power outlet after a selected time delay whenever an appliance such as a power tool that is coupled to the first power outlet draws a given amount of current through the sensing impedance.

Abstract: A power controller having first and second power outlets, connections between one side of an A.C. line to one side of each outlet, a current sensing impedance connected between the other side of the A.C. line and the other side of the first power outlet, a triac connected between the other side of said A.C. line and the other side of the second power outlet, a first operational amplifier normally maintaining said triac in a conductive condition and a second operational amplifier for preventing current from flowing through said triac to said second power outlet while an appliance coupled to said first power outlet draws a given amount of current through said sensing impedance and for a given time said appliance stops drawing said given amount of current through said impedance.

Abstract: A filter for use in a cable television system for filtering out a given channel comprising a two pole filter, said filter including one pole which is fixed at the center frequency to be tuned out and a second variable pole responsive to an input voltage, the second pole adapted to vary in frequency about the first pole.The filter is employed in addressable control system which includes an address generator at a head end, generating address control signals for each of a plurality of remote subscribers, a modulator for modulating a carrier with the address and control signal and coupling it onto cables, circuits at receiving terminals for receiving and demodulating the modulated carrier to recover the address signals, address decoding means for each subscriber to decode the address and control signals and circuits responsive to the decoding means to select the channels which each subscriber will receive.

Abstract: The frequencies of a channel containing at least one modulated carrier are encoded by heterodyning them with an alternating current wave having a cyclically varying frequency, and decoding of the encoded channel is achieved by deriving a signal corresponding to the cyclic variation in the frequencies of an encoded channel and heterodyning the encoded channel with an alternating current wave having a frequency that is varied in accordance with the signal.

Abstract: Apparatus for simulating a candle flame in which the current through the filament of a bulb is varied from a first value to a second value and back to the first value during spaced periods that vary from a period of maximum duration to a period of minimum duration that produces no observable flicker in an apparently random manner.