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Quantization Shop of Horrors


The Histogram window shows the unique sample distribution of a white Gaussian noise source that was generated and captured in full duplex loopback mode.  Below is a collection of unique and interesting histogram quantization shapes.

This gallery is part of the Full Duplex DAQ comparison survey. 


digital

a perfect white Gaussian noise distribution


Cirrus Logic CS4236B

holes, rounding error


Sound Blaster Vibra16X

inter channel DC offset


Sound Blaster 16 PCI

spikes, rounding error


Sound Blaster 128

spikes, rounding error


Sound Blaster Live!

extra filtering on left channel


VIA 8235

LSB zeroed and inter channel DC offset


SiS 7012

mystery center well and inter channel DC offset


ESS Maestro 2E

truncation, round both positive and negative samples down to zero


Griffin iMic v0.06

random DAC zero gaps


Quantization errors can create a wide variety of histogram flaws and shapes.  Most flaws are caused by numeric rounding errors in the DSP engine.  These quantization artifacts are also visible in the frequency domain and often manifest themselves as harmonic distortion. 

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