67 1Bit Audio 68 h Fig. 1 Principle diagram of 1st order ∆Σ modulation. Fig. 2 Explanatory diagram of ∆Σ modulation. 69 Fig. 3 Number of order, and noise shaping. Fig. 4 7th order ∆Σ modulation algorithm. a b Photo1 7th order ∆Σ modulation 1-chip LSI. 70 ab ab a b Fig. 6 1bit amplifier SM-SX100 block diagram. Fig. 5 Noise shaping at avoidance of extraordinary condition. Photo 2 1bit amplifier SM-S