An example of incorrect and correct coder configuration for a simple differential coding scheme is given here, to show the effects of coding noise amplification with and without noise feedback.  In the top configuration, the quantizing noise effects are objectionable after integration by the decoder filter.  In the bottom configuration, the quantizer and a decoder integrator are in a feedback loop.  The encoder operates by feeding back the effect of the decoder filter and its effect on the quantizing noise, thus pre-compensating the quantizing noise to be the inverse of the decoder filter response. (Click on any yellow area for further explanation.)

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