How can I specify CoefficientsDataType for dsp.CICCom​pensationD​ecimator?

How can I specify 'CoefficientsDataType' for dsp.CICCompensationDecimator?

It does't seem to work. Could you please show me a working example?

This is the Error that I see:

>> pol_coeff_data_type = numerictype('Signed',true,'WordLength',16,'FractionLength',16); % TWC 0.16

polfilt = dsp.CICCompensationDecimator(cicfilt, ...

'DecimationFactor' , pol_r, ...

'DesignForMinimumOrder', false,... %default='true'

'FilterOrder' , pol_length-1,...

'PassbandFrequency' , fPass, ...

'StopbandAttenuation' , 80, ...

'CoefficientsDataType' , pol_coeff_data_type, ...

'SampleRate' , cic_out_fs);

Error using fromOpaque (line 14)

Conversion to char from embedded.numerictype is not possible.

Error in opaque/strcmp (line 6)

s = strcmp(fromOpaque(s1),fromOpaque(s2));

Error in dsp.CICCompensationDecimator>@(x)strcmp('CICRateChangeFactor',x) (line 177)

if nnz(cellfun(@(x) strcmp('CICRateChangeFactor',x), varargin) >0)

Error in dsp.CICCompensationDecimator (line 177)

if nnz(cellfun(@(x) strcmp('CICRateChangeFactor',x), varargin) >0)

Answer 1

[Shiva Kalyan Diwakaruni]

Hi,

This is currently a bug in parsing the name value pairs. A workaround is to specify the CoefficientsDataType after the creation of the filter

CICDecim = dsp.CICDecimator('DecimationFactor',6, 'NumSections',6);

pol_coeff_data_type = numerictype('Signed',true,'WordLength',16,'FractionLength',16);

CICCompDecim = dsp.CICCompensationDecimator(cicfilt, ...

'DecimationFactor' , pol_r, ...

'DesignForMinimumOrder', false,... %default='true'

'FilterOrder' , pol_length-1,...

'PassbandFrequency' , fPass, ...

'StopbandAttenuation' , 80, ...

'CoefficientsDataType' , pol_coeff_data_type, ...

'SampleRate' , cic_out_fs)

CICCompDecim.CoefficientsDataType = pol_coeff_data_type;

Hope it helps.