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Low Distortion Sound Reproduction Using 8Bit cU and ZePoC-Algorithms

The ZePoC-Encoding algorithm for Class-D amplification allows to separate the signal-baseband completely from all higher-frequency switching artifacts. Realtime-ZePoC-Encoding demands a lot of computational power, but in applications where recorded signals should be reproduced, they can be encoded by a software-defined ZePoC-System in advance. Reproducing this pre-encoded signal has very low hardware requirements: No digital-analog-converter or linear amplifier is needed, the playback device must only contain memory, a counter for forming the rectangular output-signal and,if higher output-power is required, an additional switching power-stage and filter. A simple system made up of an 8bit micro-controller at 16Mhz clock-rate could reach a Signal-to-Noise-ratio of 80dB and a usable frequency range of up to 15kHz. A test-system made up of an 8bit RISC-Processor, external memory and a single-transistor, single power-supply switching-stage will be presented.

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