| 摘要 |
PURPOSE: To provide a device for supplying energy to a load and a control system and an acoustic playback system, including such types of systems. CONSTITUTION: A device by which an energy is supplied to a load having frequency characteristics in a low-frequency range is provided. Low-frequency components (H1d and H1b ), having predetermined frequencies (1/2τ and 1/8τ) and high-intensity high-frequency components (Hhd and Hhb ) are supplied to a rejector 3, which is adjusted to the predetermined frequencies (1/2τ and 1/8τ). The rejector 3 generates 3-value output signals. Energy is supplied to a load 1 by a control circuit 4 in three patterns, i.e., that a position polarity energy is supplied, that a negative polarity energy is supplied or that the energy supply is cut off, according to the level of the signal outputted by the rejector 3. With this constitution, energy supply with little consumption in the control circuit 4 and the load 1 can be realized. |
