Programmer Guide/SPU Reference/PZTF
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PZTF
pole-zero model estimation
Usage:
[SPU PZTF SP DF F0 FMIN FMAX NC IINT NN ND IALG OUT F0 ENV C NZ NP F R H E]
Inputs:
| Name | Type | Description | Default |
|---|---|---|---|
| SP | vec | log. amplitude spectrum | no default |
| DF | num | frequency resolution in Hz | no default |
| F0 | num | fundamental frequency in Hz | estimated if not supplied |
| F1,F2 | num | component search range for f0 estimation in Hz | 75-4000Hz |
| NC | num | number of f0 components to use for harmonic mean | 5 |
| IINT | num/str | envelope interpolation method (0=Linear, 1=Qaudratic, 2=SPLine) | 0=Linear |
| NN | num | number of numerator coefficients (>0) | no default |
| ND | num | number of denominator coefficients (>1) | no default |
| IALG | num/str | pole-zero algorithm (0=WLLS, 1=ND) | 1=ND |
Outputs:
| Name | Type | Description |
|---|---|---|
| F0 | num | fundamental frequency in Hz (input or estimated, 0 for error) |
| ENV | vec | log. spectrum envelope |
| C | vec | numerator and denominator coefficients |
| NZ | num | number of zeros |
| NP | num | number of poles |
| F | vec | frequency of zeros and poles |
| R | vec | radius of zeros and poles |
| H | vec | log. amplitude response |
| E | num | error (avr((ENV - H)^2) |
