Simplicity lies at the heart of 1-bit technology. Until now, most digital recording formats have relied on Pulse Code Modulation (PCM) to digitalise audio analogue information. PCM multi-bit signals record each quantised sample as an absolute value. To extract the analogue signal for playback the signal then passes through several processes (Figure 1). 1-Bit in converting analogue signals to digital, on the other hand, only records fluctuations between the quantised samples at the ultra high-speed of 2.8224 MHz. Therefore the information of 1-bit does not need any estimated decimation or complement. This simple conversion process, seen in Figure 2, modulates analogue signals onto the high frequency (64 fs = 2.8224 MHz) digital signals, removes the signals in the high frequency range by a low-pass filter during D/A conversion and then extracts the original analogue signals without devices and circuits which tend to degrade sound. 1-Bit digital signal is capable of faithfully recording, storing and transmitting the original analogue sound information as it has fewer process to go through.

fig1,2

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