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Application Note 10

Digital Transfer between SIGNAL and DAT

Recorders

Applies to: SIGNAL & RTS

NOTE: This note has not been revised for SIGNAL 4.0.

Introduction

DAT (Digital Audio Tape) recorders store audio signals in digitized format, as a sequence of

sampled data points, exactly like a SIGNAL or RTS time buffer. With additional hardware

and software, this digitized sound data can transferred directly from the DAT recorder onto

the user's hard disk without redigitizing. The resulting hard disk files can then be read into

SIGNAL or the RTS for examination and analysis.

The principal advantage of direct digital transfer is sound accuracy. It avoids the potential

degradation involved in converting the digital recording back to analog and then redigitizing

in SIGNAL. Most important, it retains the 16-bit digitization of the DAT rather than the 12-

bit coding of the standard SIGNAL analog I/O board. However, there are also several

disadvantages. One is the extra cost of interface hardware and software. Another is that the

signal's sample rate is fixed by the DAT recorder, which can waste buffer space, file size, and

computation time. And while performing a direct digital transfer appears simpler than

redigitizing, in fact, the multiple steps of starting Windows, performing the transfer, and

possibly altering or decimating the sample rate can take more time than simply redigitizing

the source material in SIGNAL from a DAT analog playback.

This note describes the hardware and software required to transfer digital sound material

between a DAT recorder and SIGNAL, the steps involved in performing the transfer, and the

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