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| 02213cam 2200373zi 4500 |
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| 001 | 9.892298 |
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| 003 | CaOODSP |
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| 005 | 20221107173131 |
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| 006 | m o d f |
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| 007 | cr |n||||||||| |
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| 008 | 201008s1995 oncd ob f|0| 0 eng d |
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| 040 | |aCaOODSP|beng|erda|cCaOODSP |
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| 041 | |aeng|bfre |
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| 043 | |an-cn--- |
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| 086 | 1 |aCo24-3/7-95-004E-PDF |
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| 100 | 1 |aBryden, Karen, |eauthor. |
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| 245 | 10|aHelium speech descrambler final report (U) / |cby Karen Bryden, H. Hassanein and François Marceau. |
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| 264 | 1|aOttawa : |bCommunication Research Centre, Industry Canada, |c1995. |
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| 300 | |a1 online resource (1 volume (various pagings)) : |bcharts. |
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| 336 | |atext|btxt|2rdacontent |
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| 337 | |acomputer|bc|2rdamedia |
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| 338 | |aonline resource|bcr|2rdacarrier |
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| 490 | 1 |aCRC report ; |v95-004 |
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| 500 | |aDigitized edition from print [produced by Innovation, Science and Economic Development Canada]. |
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| 500 | |a"June 1995." |
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| 504 | |aIncludes bibliographical references. |
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| 520 | |a"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. |
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| 546 | |aIncludes abstract in French. |
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| 650 | 0|aSignal processing|xDigital techniques. |
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| 650 | 6|aTraitement du signal|xTechniques numériques. |
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| 710 | 1 |aCanada. |bIndustry Canada, |eissuing body. |
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| 830 | #0|aCRC report ;|v95-004.|w(CaOODSP)9.882492 |
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| 856 | 40|qPDF|s1.23 MB|uhttps://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-7-95-004-eng.pdf |
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