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Application Note 5

SIGNAL Sound File Format

Applies to: SIGNAL & RTS

Introduction

This note describes the SIGNAL binary sound file format and related concepts. See the

SIGNAL and RTS user guides for background on importing and exporting sound and

measurement data. Note also that SIGNAL can export and import sound data in Wave and

AIFF file formats, which may avoid any involvement with the SIGNAL file header.

Throughout this note, "SIGNAL" refers to the SIGNAL and RTS programs interchangeably,

and "RTS" refers to both RTS and RTSD, unless otherwise noted.

Overview of SIGNAL File Types

Most commercial programs, including SIGNAL, write data in both binary- and text-file

format. Text files are typically used to store measured parameters, sound similarity values,

and other extracted parameters, as well as general text information. They are created and

read by the Write ASCII (WA) and Read ASCII (RA) command families in SIGNAL and the

log-file storage command (L) in the RTS. Text files are virtually computer-independent, and

they are the common denominator of file exchange among commercial statistics, spreadsheet,

database, and graphics programs. They can be transferred easily between PC and Macintosh

environments. And they can be easily viewed by the user, via TYPE or PRINT commands in

DOS, or altered using a text editor such as DOS EDIT.

Binary files are normally used for storing and exchanging sampled sound signals. They are

created and read with the Write (W) and Read (R) commands in both SIGNAL and the RTS.

They are much more space-efficient than text files. Binary files are typically written in one

of two forms - with a proprietary file header containing information such as size, sample rate,

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