| 摘要 |
PURPOSE:To flatten a frequency characteristic and to simplify the constitution of a network circuit by utilizing the frequency characteristic of a piezoelectric speaker obtained by a resonance characteristic inherent to a piezoelectric effect. CONSTITUTION:The network circuit of a piezoelectric speaker system consists of a piezoelectric tweeter 1 which responds to a high-frequency signal and the piezoelectric speaker 2 which responds to a signal at a lower pressure side than the tweeter 1. One of the speaker terminals, 1a of this tweeter 1 is connected to an input terminal 6 through a resistance 3, and the other speaker terminal 1b is connected to the other input terminal 7; and a resistance 4 is connected between both terminals 1a and 1b. A speaker terminal 2a of the speaker 2 is connected to the terminal 6 through a coil 5, and the other speaker terminal 2b is connected to the terminal 7. Then, the frequency characteristics of the speakers 1 and 2 obtained by the resonance characteristic inherent to the piezoelectric effect are utilized effectively to simplify the network circuit, flattening the frequency characteristics. |
