Engineering Design NIDisk Betriebsanweisung PDF herunterladen (Seite 8)

SIGNAL/RTS APPLICATION NOTES

4 Application Note 5

number of time and frequency cells in the matrix, XFTLEN, the FFT length of the

spectrogram, and YLOW and YRANGE, the frequency origin and frequency range of the

data.

Data Section

The data section is written as continuous numerical data, with no intervening record or

block marks, in either 16-bit integer or 32-bit floating point format (depending on

DATA_TYPE in the header). Floating-point numbers are represented in IEEE 754 format.

See Application Note 11, "Exchanging Data Files between SIGNAL and MATLAB", for a

detailed discussion of floating-point representation.

Header Format

Following is the format of the two header blocks in the SIGNAL sound file. Again, note that

elements marked with an asterisk (*) are mandatory. Unused elements are filled with spaces

(hex 20) if literal (type L), or zeroes if numerical (type N). Literal elements are padded with

trailing blanks. Reserved elements are filled with zeroes.

File Header Block #1

File Attributes

Elt No. Type Title Contents

1 * L PGM_STAMP SIG (SIGNAL)

RTS (RTS or RTSD)

EXT (External)

2 L PGM_VERSION x.xx (Version)

3 * N NHBLKS No. header blocks

4 * N NDBLKS No. data blocks

5 * L BUFFER_TYPE T = Time

F = Frequency

FT = Frequency-Time

6 * L DATA_TYPE I = Integer

R = Real

7 * N CONV_FACTOR [Integer time file only]

8 * N OFFSET [Integer time file only]

9 * N NCHAN [Time file only]

10-20 N Reserved

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

Keine Kommentare

Engineering Design NIDisk Betriebsanweisung Seite 8