Filter Design Toolbox

reset

Reset one or more quantizers, quantized filters, or quantized FFTs to their initial conditions

Syntax

• reset(q)
  reset(q1, q2, ...)
  reset(hq)
  reset(hq1,hq2,...)
  reset(f)
  reset(f1,f2,...)
  

Description

reset(q) resets quantizer q to its initial conditions. Works for quantized filters and quantized FFTs as well by replacing the quantizer with a quantized filter or quantized FFT in the command syntax.

reset(q1, q2,...) resets the states of the quantizers q1, q2,.... to the states they were in when you created them -- their initial conditions.

The states of a quantizer are

• 'max'         - Maximum value before quantizing. 
  'min'         - Minimum value before quantizing. 
  'noverflows'  - Number of overflows. 
  'nunderflows' - Number of underflows. 
  'noperations' - Number of quantization operations performed.
  

reset(hq1,hq2,...) resets the states of quantized filters hq1, hq2,... to the states you set when you created them -- their initial conditions.

The states of a quantized filter are

•    'FilterStructure' - Structure of the filter
         'ScaleValues' - Scale values between filter sections
    'NumberOfSections' - Number of filter sections
    'StatesPerSection' - Number of states in each filter section
   'CoefficientFormat' - quantizer
         'InputFormat' - quantizer
        'OutputFormat' - quantizer
  'MultiplicandFormat' - quantizer
       'ProductFormat' - quantizer
           'SumFormat' - quantizer
  

reset(f1,f2,...) resets the states of quantized FFTs f1, f2,... to the states you set when you created them -- their initial conditions.

The states of a quantized FFT are

•              'Radix' - Either 2 or 4
              'Length' - Scalar integer, length of the FFT
   'CoefficientFormat' - quantizer
         'InputFormat' - quantizer
        'OutputFormat' - quantizer
  'MultiplicandFormat' - quantizer
       'ProductFormat' - quantizer
           'SumFormat' - quantizer
    'NumberOfSections' - 4
         'ScaleValues' - Vector of the scale values between FFT 
                         sections
  

Examples

• q1 = quantizer('fixed','ceil','saturate',[4 3]) 
  q2 = quantizer('double') 
  y1 = quantize(q1, -1.2:.1:1.2 ) 
  y2 = quantize(q2, -1.2:.1:1.2 ) 
  q1, q2 
  reset(q1, q2) 
  q1, q2 
  

See Also
quantizer, set

realmin

scalevalues