| 摘要 |
PURPOSE:To execute an economical radiation design in a device which contains a multi-amplifier using a power IC for constituting two power amplifiers, by providing a limiter corresponding to a sound pressure difference of a tweeter and a woofer, on an input of the power amplifier for the tweeter. CONSTITUTION:An input signal which has passed through a buffer amplifier 1 is applied to a high-pass filter 2 and a low-pass filter 5. The input signal which has passed through the high-pass filter 2 is outputted to a tweeter 4 through a power amplifier 3a. The input signal which has passed through the low-pass filter 5 is outputted to a woofer 6 through a power amplifier 3b. The input signal which has passed through the high-ass filter 2 is limited by a limiter constituted of Zener diodes 7, 8, therefore, an output of the power amplifier 3a is limited. In this way, by lowering the output of one power amplifier, an economical radiation design can be executed in a device which contains a multi- amplifier using a power IC which can constitute two power amplifiers. |
