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A Distortion-free PWM Coder for All-digital Audio Amplifiers

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Using analytic PCM-to-PWM mapping, combined with a novel method for eliminating PWM-induced distortions (Jithering), a distortion-free, all-digital and high-quality PWM coder was developed. High efficiency and performance is achieved at switching frequencies between 44.1-176.4kHz. A Field Programmable Gate Array - based environment was used for the implementation of the PWM converter, which is suitable for any digital audio applications.

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AES - Audio Engineering Society