| 摘要 |
PURPOSE:To reduce amplitude and phase distortion of the high-frequency component of a voice signal by performing pulse width modulation with regard to each out-of-phase distributed signal and a voice signal, by synthesizing them after passing them through low-pass filters, and then by generating an amplitude- modulated wave by mixing their outputs with a high frequency signal. CONSTITUTION:The output signal of an oscillator 21 is supplied toan opposite phase distributor 22. Output signals made opposite in phase are supplied to pulse width modulators 23 and 24 together with a voice signal fA. Modulation output signals are supplied to LPFs 25 and 26 to eliminate high frequency components and then their outputs are synthesized by a synthesizer 27. The output signal of an oscillator 28 is supplied to a power amplifier 29 together with the output signal of the synthesizer 27 and they are mixed together to generate an amplitude-modulated wave. |
