| LTPDA Toolbox™ | contents | ![]() |
LTFE implements transfer function estimation computed on a log frequency axis. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% DESCRIPTION: LTFE implements transfer function estimation computed on a log frequency axis. The estimate is done by taking the ratio of the CPSD between the two inputs, Sxy, divided by the PSD of the first input, Sxx: Sxy / Sxx where x is the first input, y is the second input CALL: b = ltfe(a1,a2,pl) INPUTS: a1 - input analysis object a2 - input analysis object pl - input parameter list OUTPUTS: b - output analysis object Parameters Description References: "Improved spectrum estimation from digitized time series on a logarithmic frequency axis", Michael Troebs, Gerhard Heinzel, Measurement 39 (2006) 120-129. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
| Method Details | |
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| Access | public |
| Defining Class | ao |
| Sealed | 0 |
| Static | 0 |
| Sets for this method … |
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| Default |
Default |
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| no description | |||
| Key | Default Value | Options | Description |
| ltfe | |||
| WIN | 'Hanning' |
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The window to be applied to the data to remove the discontinuities at edges of segments. [default: taken from user prefs] Only the design parameters of the window object are used. Enter a string value containing the window name e.g. plist('Win', 'Kaiser', 'psll', 200) plist('Win', 'BH92') |
| PSLL | 200 | none | The peak sidelobe level for Kaiser windows. Note: it is ignored for all other windows |
| OLAP | -1 | none | The segment percent overlap [-1 == take from window function] |
| ORDER, N | 0 |
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The order of segment detrending:
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| DROP WINDOW SAMPLES | 1 |
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Drop the recommended (by the window) number of samples of the final computed spectral series. |
| TIMES, SPLIT | [] | none | The time range to analyze. If not empty, sets the time interval to operate on. As in ao/split, the interval can be specified by:
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| MASK | [] | none | Mask out segments in the averaging process. The mask should be a vector of logical values, one value per segment being averaged. The plist method [psdSegments] can be used to generate a default mask for your PSD settings. If empty, all segments will be included in the average. |
| KDES | 100 | none | The desired number of averages. |
| JDES | 1000 | none | The desired number of spectral frequencies to compute. |
| LMIN | 0 | none | The minimum segment length. |
Example |
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| plist('WIN', 'Hanning', 'PSLL', [200], 'OLAP', [-1], 'ORDER', [0], 'DROP WINDOW SAMPLES', [true], 'TIMES', [[]], 'MASK', [[]], 'KDES', [100], 'JDES', [1000], 'LMIN', [0]) |
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| Some information of the method ao/ltfe are listed below: | |
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| Class name | ao |
| Method name | ltfe |
| Category | Signal Processing |
| Package name | ltpda |
| Can be used as modifier | 0 |
| Supported numeric types | {'double'} |
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Method: ao/lscov | Method: ao/map3D | ![]() |
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