| 摘要 |
PROBLEM TO BE SOLVED: To reduce the intensity of EMI radiated in driving a speaker.SOLUTION: A speaker box including an enclosure with openings includes: digital speakers disposed on the openings and each having k digital input terminals; and digital modulation circuits disposed inside the enclosure and driving the digital speakers. The digital modulation circuits each have a filter for modulating inputted digital audio signal and outputting an m-bit digital signal, and k drive circuits each receiving a part of the m-bit digital signal and outputting a signal to the k digital input terminals. |
