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SIGNAL/RTS APPLICATION NOTES
8 Application Note 5
Exchanging Sound Files with External Systems
Binary sound files can be exchanged between SIGNAL and other data acquisition systems.
This requires that the sound files be in a format compatible with both systems. Approaches
include: (1) write SIGNAL files in headerless binary format, (2) write SIGNAL files in Wave
or AIFF format, (3) convert files from the SIGNAL format to the other system's format using
a file converter, and (4) convert the other system's files to the SIGNAL format using a file
converter. See the file import/export sections of the SIGNAL and RTS user guides for more
detail. SIGNAL can read and write headerless binary files, and the RTS can write but not
read headerless binary files. When writing a program to convert an external data file to the
SIGNAL file format, keep the following points in mind.
1. Place the label "EXT" in PGM_STAMP and leave PGM_VERSION blank.
2. Determine CNVFAC and OFFSET for the external data, either empirically, or based
on the known resolution and range of the external A/D converter.
3. Block and record marks may not appear anywhere in the file.
Programming Access to SIGNAL Files
The data section in the SIGNAL sound file is written as continuous numerical data, with no
intervening record or block marks. Data can be read and written using any of the following
software tools.
Software
Environment Routines/Settings
FORTRAN direct I/O ACCESS=DIRECT, FORM=UNFORMATTED
C low-level I/O open( ), read( ), write( )
DOS file services Open file, read file, write file =
DOS int 21h, functions 3ch, 3dh, 3eh, 3fh, 40h, and 42h
4-30-92
Rev 9-25-95
Rev 5-9-99
Rev 5-25-02
Rev 1-15-04
Rev 3-31-08 Caption extended from 72 to 80 characters
- Application Notes 1
- SIGNAL system. No part of 2
- Table of Contents 3
- Application Note 5 5
- Sound File Structure 6
- Header Section 7
- Header Format 8
- File Header Block #1 8
- Buffer Attributes 9
- Temporary 9
- Buffer-Type Specific 10
- Buffer Caption 10
- Reserved for System 10
- File Header Block #2 11
- SIGNAL/RTS APPLICATION NOTES 12
- 8 Application Note 5 12
- Application Note 6 13
- 2 Application Note 6 14
- Application Note 8 15
- 2 Application Note 8 16
- Application Note 10 17
- DAT Recorders 18
- S/PDIF Interface Boards 18
- Transfer Software 19
- Sound Card 19
- Sample Rate Converter 19
- Operating Instructions 20
- Using the DAT File in SIGNAL 21
- 6 Application Note 10 22
- Performance Specifications 23
- Application Note 11 25
- 2 Application Note 11 26
- SIGNAL-header integer files 26
- Application Note 11 3 27
- Headerless integer files 27
- 4 Application Note 11 28
- Application Note 11 5 29
- Row-Column Order 29
- 6 Application Note 11 30
- Row-Column Dimensions 30
- MATLAB Demo Files 31
- Text vs. Binary format 32
- Data Precision 33
- Data Byte Format 33
- 10 Application Note 11 34
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