Filter Design Toolbox

fractionlength

Return the fraction length for a quantizer

Syntax

• f = fractionlength(q)
  

Description

f = fractionlength(q) returns the fraction length of quantizer q. This is useful because fraction length is valid whether the quantizer mode is floating-point or fixed-point.

Examples

For a floating-point quantizer

• q = quantizer('float',[32 8]); 
  f = fractionlength(q); 
  

returns .

For a fixed-point quantizer

• q = quantizer('fixed',[6 4]) 
  f = fractionlength(q); 
  

returns f = 4.

Algorithm

For floating-point quantizers, f = w - e - 1, where w is the word length and e is the exponent length.

For fixed-point quantizers, f is part of the format [w f].

See Also
quantizer

firnyquist

freqz