| 摘要 |
PURPOSE:To enhance an easy-to-use load control device interlocked with sounds by controlling the load with either of a plurality of predetermined control conditions, and changing the control condition in conformity to a changeover signal. CONSTITUTION:A sound level signal (b) is fed to a sound pressure level comparator circuit 23 to be compared by reference to a plurality of reference levels Vrf1, Vrf2, Vrf3, and emission is made in the form of sound pressure change amount signals c, d, e for the level change signal, for ex., to become H in the period in which the reference levels Vrf1-Vrf3 are exceeded. These signals c, d, e are subjected to analog summing at an adding device 24, and an addition signal (f) is emitted. This signal (f) is compared at a comparator 25 with the reference level Vrf4, followed by emission of a scene changeover pulse (g), with which the adding device 24 and comparator 25 are reset. Provision of a control device to change the control condition on the basis of changeover signal in this manner will accomplish an easy-to-use load control device interlocked with sounds. |
