Engineering Design NIDisk Manuel d'utilisateur télécharger pdf (Page 15)

WaveDisk User Guide

Disk fragmentation and maximum sample rate

On older hard disks, fragmentation can degrade the maximum sample rate. Disks can be

defragmented in Windows 95/98/2000/XP by clicking My Computer | Files | Properties |

Tools | Defragment Now. This process should be performed with care.

5. Technical Notes

Technical Specifications for WaveDisk with SB16-PCI Card

Following are technical specifications of the WaveDisk program, operating with a Sound

Blaster SB16-PCI sound card (an older sound card) and an Audigy 2 NX external USB sound

card unit (2004).

SB16-PCI Audigy 2 NX

Max input channels 1 1

Max output channels 1 1

Digital resolution 16-bit = 96 dB 16-bit = 96 dB

Max signal level

± 100-150 mVolts (approx) ± 3.5 Volts

Programmable input gain none none

Sample rates 11.025, 22.05, 44.1 kHz 11.025, 22.05, 44.1 kHz

Max signal length Limited by physical disk size Limited by physical disk size

Input signal bandwidth 20 Hz - 20 kHz (approx)

20 - 20 kHz (± 0.5 dB)

Output signal bandwidth 20 Hz - 20 kHz (approx)

5 Hz – 17.5 kHz (± 0.5 dB)

Anti-alias filter Internal Internal

6. Using WaveDisk and SIGNAL

WaveDisk can be used in conjunction with the SIGNAL

sound analysis program to record

extended acoustic data sequences, then locate and analyze the sound events within them.

This section describes the overall approach, basic tools, and important information sources.

The two programs work together as follows:

• WaveDisk provides long-duration direct-to-disk recording, producing long continuous

sound files in the SIGNAL or Wave sound file format.

• SIGNAL can display the entire sound file on screen or hardcopy (future), which the

researcher can use as a roadmap to extract specific sound events. SIGNAL can manually

extract, display, measure, and analyze these events and store them as individual sound

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Engineering Design NIDisk Manuel d'utilisateur Page 15