| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital amplifier which efficiently removes noises which include a carrier signal frequency and the high harmonic wave component thereof. SOLUTION: The digital amplifier is equipped with: a digital modulator 1 for digital modulating an inputted analogue signal or digital signal by using a specified carrier signal; and a low pass filter 31 which consists of a reactor and a capacitor and filters a modulated output signal of the digital modulator. The amplifier is further provided with a phase adjuster 6 for extracting the carrier signal from the digital modulator 1 and adjusting a phase of the extracted carrier signal and a high frequency noise suppressing means equipped with an auxiliary coil which is electromagnetically coupled with the reactor. An output of the phase adjuster 6 is supplied to the auxiliary coil and the high frequency noise included in the modulated output signal is suppressed. COPYRIGHT: (C)2004,JPO
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