TD_POWERSPEC ( SERIES_SPEC (time_series), FUNC_PARAMS ( [ FREQ_STYLE ({ K_INTEGRAL | K_SAMPLE_RATE | K_RADIANS | K_HERTZ | K_PERIODICITY }) ] [, HERTZ_SAMPLE_RATE (hertz_sample_rate) ] [, ZERO_PADDING_OK ({ 0 | 1 }) ] [, ALGORITHM ({ AUTOCORR | AUTOCOV | FOURIER | INCRFOURIER }) ] [, INCRFOURIER_PARAM (INTERVAL_LENGTH (interval_length), SPACING_INTERVAL (spacing_interval)) ] [, WINDOW ( WINDOW_NAME ({ "NONE" | "TUKEY" | "BARTLETT" | "WELCH" | "PARZEN" }), WINDOW_PARAM (window_parameter) ) ] ) );