- SERIES_SPEC
- Specify the SERIES_SPEC of the input time series or spatial series.
- FUNC_PARAMS
-
Name Data Type Description DFFT (ZERO_PADDING_OK) Integer [Optional] The number of zeros to add to the end of a given series to achieve a more efficient computation of the Fast Fourier Transform coefficients. A value of 1 means true, and a value of 0 means false. The default is 1. For best results, use 1. DFFT (FREQ_STYLE) Enumerated list [Optional] The format or values associated with the x-axis of the output. Choices are: - K_INTEGRAL: Integer representation.
- K_SAMPLE_RATE: Integer normalized to number entries, with ranges from -0.5 to +0.5.
- K_RADIANS: Radian ranges from -π to +π.
- K_HERTZ: Frequency in hertz. Must be used in conjunction with HERTZ_SAMPLE_RATE.
The default is K_INTEGRAL.
DFFT (HERTZ_SAMPLE_RATE) FLOAT The sample rate as a floating point constant, in hertz. A value of 10000.0 indicates that the sample points were obtained by sampling at a rate of 10,000 hertz. This parameter is only valid with the FREQ_STYLE(K_HERTZ) parameter. DFFT (ALGORITHM) Enumerated list [Optional] The user-defined algorithm that bypasses the internal DFFT planner, and influences the core DFFT algorithm associated with the primary DFFT calculation. Choices are COOLEY_TUKEY, or SINGLETON. When this parameter is not present, then the internal DFFT planner selects the most efficient algorithm for the operation.
For best performance, do not include this parameter. Instead, let the internal DFFT planner to select the best algorithm.
DFFT (HUMAN_READABLE) Integer [Optional] Indicator to determine whether the produced output rows are in human-readable or plottable form, or the output is in the raw-form. Human-readable output is symmetric around 0, such as -3, -2, -1, 0, 1, 2, 3. Raw output is sequential, starting at zero, such as 0, 1, 2, 3. A value of 1 means true, and the output is in human readable form. A value of 0 means false, and the output is in raw form. The default is 1.
WINDOW (SIZE (NUM) ) Integer Size of the window. Must be greater than zero. Specify either this parameter or WINDOW( SIZE ( PERC ) ).WINDOW (SIZE (PERC) ) FLOAT Size of the window within a series as a percentage. Must be greater than zero. For example, use 80 for 80%. WINDOW (OVERLAP) Integer [Optional] The number of values the window slides down for each DFFT calculation within a series. The value must be less than the window size. The default is zero.To use fraction form, use WINDOW(OVERLAP(PERC)) WINDOW (IS_SYMMETRIC) Integer [Optional] Indicator to use a symmetric or periodic window. Value of 1 indicates symmetric, and value of 0 indicates periodic. The default is 1. WINDOW (TYPE) Enumerated list [Optional] The type of window to use. Options are: - BARTHANN
- BARTLETT
- BLACKMAN
- BLACKMANHARRIS
- BOHMAN
- BOXCAR
- COSINE
- EXPONENTIAL
- FLATTOP
- GAUSSIAN
- GENERAL_COSINE
- GENERAL_GAUSSIAN
- GENERAL_HAMMING
- HAMMING
- HANN
- KAISER
- NUTTALL
- PARZEN
- TAYLOR
- TRIANG
- TUKEY
Some windows have additional options such as Taylor, in which case refer to the Taylor parameter for specific Taylor window options.WINDOW (SCALE) Enumerated list [Optional] The spectral density type applied to the result values. Options are DENSITY and SPECTRUM. EXPONENTIAL (CENTER) FLOAT [Optional] The center of the window. It is a parameter for WINDOW( TYPE( EXPONENTIAL ) ). The default value is (windowSize – 1 ) / 2. EXPONENTIAL (TAU) FLOAT [Optional] The amount of window decay. It is a parameter for WINDOW( TYPE( EXPONENTIAL ) ). If the center is zero, then use –( windowSize – 1 ) / ln( x ) if x is the fractional part of the window remaining at the end of the window.
GAUSSIAN (STD) FLOAT The sigma standard deviation. It is a required parameter if WINDOW( TYPE( GAUSSIAN ) ) is specified. GENERAL_COSINE (COEFF) FLOAT ARRAY List of weighting coefficients. Required parameter when WINDOW(TYPE(GENERAL_GUASSIAN) is specified. GENERAL_GAUSSIAN (SHAPE) FLOAT The gaussian shape, and the value is 1. Required parameter when WINDOW(TYPE(GENERAL_GUASSIAN) is specified. GENERAL_GAUSSIAN (SIGMA) FLOAT The standard deviation value. Required parameter when WINDOW(TYPE(GENERAL_GUASSIAN) is specified. GENERAL_HAMMING (ALPHA) FLOAT The value of the window coefficient. Required parameter when WINDOW( TYPE( GENERAL_HAMMING ) is specified. KAISER (BETA) FLOAT The value for the shape between the main lobe width and side lobe level. Required parameter when WINDOW(TYPE(KAISER)) is specified. TAYLOR (NUM_SIDELOBES) Integer The number of nearly constant level sidelobes adjacent to the main lobe. Optional parameter for WINDOW(TYPE(TAYLOR)). The default value is 4. TAYLOR (SIDELOBE_SUPPRESSION) FLOAT Value must be positive. The suppression level of the side lobe in decibels relative to the DC gain of the main lobe. Value is positive. Optional parameter for WINDOW(TYPE(TAYLOR)). The default value is 30. TAYLOR (NORM) Integer Indicator for how the window is divided. When set to 1 for an odd sized window, divides the window by the largest (middle) value. For an even sized window, divides the window by the value that would occur between the two middle values. Optional parameter for WINDOW(TYPE(TAYLOR)). The default value is 1. TUKEY (ALPHA) FLOAT Defines the shape of the window inside the cosine-tapered region. A value of 0 is a rectangular window. A value of 1 is the same as a Hann window. Required parameter if WINDOW(TYPE(TUKEY)) is specified.