Filter Design Toolbox

wordlength

Return the word length for a quantizer

Syntax

• wordlength(q)
  

Description

wordlength(q) returns the word length of quantizer q.

Examples

• q = quantizer([16 15]); 
  wordlength(q) 
  

returns 16.

Even though the word length can be read in two stages,

• q = quantizer([16 15]); 
  fmt = q.format; 
  w = fmt(1); 
  

it is handy to have it available for use in equations. For example, the algorithm for realmax(q) when q is a signed fixed-point quantizer (q.mode = 'fixed') is

which can be coded as

• q = quantizer('fixed',[8 4]); 
  r = pow2(wordlength(q) - fractionlength(q) - 1) - eps(q) 
  

See Also
fractionlength, exponentlength

unitquantizer

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