Filter Design Toolbox

nunderflows

Return the number of underflows from the most recent quantizer operation

Syntax

• nunderflows(q)
  

Description

nunderflows(q) is the number of underflows during a call to quantize(q,...) for quantizer object q. An underflow is defined as a number that is nonzero before it is quantized, and zero after it is quantized. The number of underflows accumulates over successive calls to quantize. Use the function reset(q) to return nunderflows to zero.

Examples

• q = quantizer('fixed','floor',[4 3]);
        x = (0:eps(q)/4:2*eps(q))';
        y = quantize(q,x);
        nunderflows(q)
  
  ans =
  
       3
  

By looking at x and y, you can see which ones went to zero.

• [x,y]
  ans =
  
           0         0
      0.0313         0
      0.0625         0
      0.0938         0
      0.1250    0.1250
      0.1563    0.1250
      0.1875    0.1250
      0.2188    0.1250
      0.2500    0.2500
  

See Also
denormalmin, eps, quantize, quantizer, reset

numberofsections

optimizeunitygains