Helium speech descrambler final report (U) / by Karen Bryden, H. Hassanein and François Marceau.: Co24-3/7-95-004E-PDF
"The presence of helium in the breathing gas used in certain military diving operations renders the divers' speech unintelligible. This distortion represents a danger to the divers. A new, lower cost device was developed to "descramble" the divers speech. The device is based on linear prediction and uses interpolation of the autocorrelation function to remove the nonlinear frequency distortion. It is implemented on a digital signal processing chip in both fixed and floating point arithmetic. Another algorithm based on frequency domain manipulation is described. During tests, it became apparent that distortion caused by the diver's face mask and limitations of the microphone in the diver's helmet were major contributors to communication problems"--Abstract.
Permanent link to this Catalogue record:
publications.gc.ca/pub?id=9.892298&sl=0
| Department/Agency | Canada. Industry Canada, issuing body. |
|---|---|
| Title | Helium speech descrambler final report (U) / by Karen Bryden, H. Hassanein and François Marceau. |
| Series title | CRC report ; 95-004 |
| Publication type | Series - View Master Record |
| Language | [English] |
| Format | Electronic |
| Electronic document | |
| Note(s) | Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. "June 1995." Includes bibliographical references. Includes abstract in French. |
| Publishing information | Ottawa : Communication Research Centre, Industry Canada, 1995. |
| Author / Contributor | Bryden, Karen, author. |
| Description | 1 online resource (1 volume (various pagings)) : charts. |
| Catalogue number |
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| Subject terms | Signal processing -- Digital techniques. Traitement du signal -- Techniques numériques. |