Lavry 3000S Operation Manual page 24

Appendix I
AUDIO PRECISION FFT AMP1(dBFS)
-80.00
-85.00
-90.00
-95.00
-100.0
-105.0
-110.0
-115.0
-120.0
-125.0
-130.0
-135.0
-140.0
-145.0
-150.0
-155.0
-160.0
-165.0
-170.0
20.00 2.02k 4.02k 6.02k 8.01k 10.0k 12.0k 14.0k 16.0k 18.0k 20.0k 22.0k 24.0k
Fig. 9- 16 bit input signal -100 dB
high pass dither applied
Figure 9 shows the original 16 bit input signal processed with high-pass dither only. Notice that the
additional distortion is gone.
Figure 10 shows Acoustic Bit Correction (dither and noise-shaping) applied to the same signal with an
increase in the effective noise floor. Acoustic Bit Correction cannot remove truncation distortion in an
incoming 16 bit signal, but it can avoid additional truncation distortion if additional processing, such as
sample rate conversion, has been applied.
22
vs FREQ(Hz) 14 NOV 93 13:59:14 AUDIO PRECISION FFT AMP1(dBFS) vs FREQ(Hz)
-80.00
-85.00
-90.00
-95.00
-100.0
-105.0
-110.0
-115.0
-120.0
-125.0
-130.0
-135.0
-140.0
-145.0
-150.0
-155.0
-160.0
-165.0
-170.0
20.00 2.02k 4.02k 6.02k 8.01k 10.0k 12.0k 14.0k 16.0k 18.0k 20.0k 22.0k 24.0k
Fig. 10- 16 bit input signal -100 dB
Acoustic Bit Correction applied
LE3000S
14 NOV 93 14:00:12