Engineering Design NIDisk Guia do Utilizador descarregar pdf (Página 9)

SIGNAL Sound File Format

Application Note 5 5

Buffer Attributes

All Buffer Types

21 * N TPNTS No. data points (per channel)

22 * N SRATE Sample rate (pts/sec)

23 * N XLOW X-origin (msec)

24 * N XRANGE X-range (msec)

25-26 L QTY Physical quantity (e.g. AMPL)

27-28 L UNITS Physical units (e.g. VOLTS)

29 L SCALE < > = linear

DB = log

30-34 L TITLE Buffer title

35 L MODE < > = Not complex

R = Real part, complex

I = Imag part, complex

M = Magnitude, complex

P = Phase, complex

N = Normalized mag, complex

36 L WINDOW RECT = Rectangular

HANN = Hanning

HAMM = Hamming

[ F & FT only ]

37 N SMOOTHING Smoothing width (msec,Hz)

38-39 L { DATE [3.0 and earlier] mm-dd-yy

{ Reserved [3.1 and later]

40 L XFSCALE Transform energy scaling:

PS = power spectrum

PSL = PS w/ length scaling

PSD = power spectral density

PSDL = PSD w/ length scaling

ES = energy spectrum

ESD = energy spectral density

41-43 L DATE2000 mm-dd-yyyy

44 I TPNTS No. data points (4-byte integer)

45 N Reserved

Temporary

[ Defined in buffer directory, but not written into file header]

46 N SBUF Transform source buf no.

47-50 N Reserved

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 33 34

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Engineering Design NIDisk Guia do Utilizador Página 9