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Rights & Permissions Free Resources PDF EXECUTIVE SUMMARY Display this book on your site! Related Titles Superfund and Mining Megasites: Lessons from the Coeur d'Alene River Basin Noise and Military Service: Implications for Hearing Loss and Tinnitus Other Related Titles Report of the Committee on Ballistic Acoustics (1982) Commission on Physical Sciences, Mathematics, and Applications (CPSMA) Web Search Builder Use this book's key terms to search within this book, across our collection, or across the Web. Skim This Chapter Skim this chapter and use this chapter's key terms to search within this book. Reference Finder Paste in your own text to find books that relate to your topic. Page 95   E-mail  Facebook  Digg  Stumble  Twitter More Page 95 Front Matter (R1-R4) Executive Summary (1-2) 1 Introduction and Overview (3-7) 2 Description of Studies by BRSW and WA (8-11) 3 Evaluation of BRSW and WA Methodologies and Conclusions (12-17) 4 Timing Evidence from Matching Features (18-31) 5 Evaluation of the FBI Report (32-32) 6 Possible Further Studies (33-33) 7 Conclusions (34-34) Appendix A: Criticisms of Probability Calculations (35-40) Appendix B: Analyses of Sound Spectrograms of Hold Everything... (41-59) Appendix C: Timing of Channel I and II Events (60-80) Appendix D: Possibility of Superposed Recordings (81-88) Appendix E: Siren Sounds (89-91) Appendix F: Possible Further Studies (92-94) Figures (95-112)

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4f 3.5 2.5 u, In _ ~ 1.5 0.5 I I I I I I I I I I , I I I I I I I I ' ' 1 r r 1 T 1 . · ' ~ I I ~ L _ l _/ ~ — LIN E CORRESPONDS TO LEAST _ SQUARES LINEAR FIT - T' =-0.0216 + 1.0593 T" I' O ~ 1 1 ~ 1 ~ ~ 1 ~ 1 , 1 ~ ~ 1 , , , , ~ , , , , 1 , 1 ~ ~ 1 1 ~ ~ t: ~0 0.5 1 1.5 2 2.5 3 T " (sees ) Figure 5. Plot of T' versus T" for corresponding characteristics with the values of Table B-1. The marked linearity of the curve demonstrates the validity of the identification. The straight line in the figure is a plot of the given equation, which in turn is a robust linear regression fit to the plotted points. The analysis leading to this figure is given in Appendix B and Table Be-. The point furthest off the line is at T" = 1.195s and is for the incorrectly identified characteristic I, as discussed in Appendix B.

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INDIVIDUAL SPECTRA ARE 10 MSEC. APART. FREQUENCY BINS ARE 50 HZ APART. CHANNEL II BRIEF TONES ARE INDICATED BY TWO VERTICAL DASHED LINES. THE LAST COLUMN INDICATES THE ENERGY IN THE CHANNEL II BRIEF TONES (TWO BINS BETWEEN THE DASHED LINES). SPECT. TOTAL ENERGY IN INDIVIDUAL FREQUENCY BINS. DIGIT 'D' NUMB. SPECT. REPRESENTS ENERGY (IN DB) FROM 20+4*D TO 24+4*D ENERGY BINS HAVING ENERGY LESS THAN 45 DB ARE NOT PLOTTED. (DB) 3199 57.4 3200 58.0 3201 57.6 3202 57.8 3203 59.2 3204 59.2 3205 59.6 3206 59.1 3207 59.6 3208 59.7 3209 59.2 6776 3210 61.4 67877876 3211 61.4 8986 3212 62.2 7997776 3213 61.3 7776 666 786 666 3214 61.9 776 7897 3215 60.9 66887 3216 61.6 78886 3217 61.9 68986 3218 60.2 68866 67 3219 60.8 678886 3220 60.9 66888776 3221 60.4 7986 3222 60.4 79876 3223 60.1 8886 3224 59.6 67887 3225 57.2 3226 56.3 3227 56.1 3228 56.3 3229 58.1 3230 59.4 3231 59.6 3232 59.3 3233 58.8 3234 59.4 3235 59.2 3236 59.6 3237 59.2 3238 59.3 3239 58.7 3240 58.6 3241 58.1 3242 58.1 3243 59.1 3244 59.5 66 6666666 6677777 6 66 6 6 6 617716 61781 7817 178186 618817 618917 8817 18918 6818816 6 77 6 66 6 66 66 6 6 6 66 17716 6177 771 17716 71871 718816 718816 618816 71881 718817 18817 718817 718816 718817 18817 718816 618816 618816 61771 ENERGY IN BRIEF TONE (DB) s3.2 54.9 55.5 56.7 57.1 58.2 57.7 57.9 58.0 53.1 54.1 54.1 54.3 54.5 56.6 57.3 57.9 57.6 58.0 57.8 57.8 57.7 58.0 57.9 57.3 57.1 57.0 s3.4 Figure B-7. Printer plot of the Channel II spectra towards the end of the "Hold everything ..." segment. The BRIEF TONE window is delimited by the vertical bars (for which space has been made in the plot).

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INDIVIDUAL SPECTRA ARE 10 MSEC. APART. FREQUENCY BINS ARE 50 HZ APART. THE MIRRORED CHANNEL II BRIEF TONES ARE INDICATED BY TWO VERTICAL DASHED LINES. NOTE THE PRESENCE OF A STRONG CHANNEL I HETERODYNE FROM 3203 TO 3216 AND THE AGC ACTION FOLLOWING IT. SPECT. TOTAL ENERGY IN INDIVIDUAL FREQUENCY BINS. DIGIT 'D' NUMB. SPECT. REPRESENTS ENERGY ('IN DB) FROM 20+4*D TO 24~4*D ENERGY ALL BINS WHICH ARE PLOTTED ON CH.II ARE PLOTTED HERE UNLESS THE ENERGY IS LESS THAN 24DB. OTHER BINS ARE PLOTTED ONLY IF THEY EXCEED (DB) ('TOTAL ENERGY - 11) DB. ENERGY IN CHANNEL II BRIEF TONE ATTEN OF CH.II BRIEF TONE (DB) (DB) 3199 54.3 3 34565 4 3200 54.9 66 5 514313 40.3 -12.9 3201 55.8 66 51551 44.4 -10.5 3202 59.2 15414 44.8 -10.7 3203 61.5 153144 88 40.8 -15.9 3204 62.6 112313 899 34.1 -23.1 3205 62.5 211212 899 31.0 -27.1 3206 61.0 12314 798 36.8 -20.9 3207 59.1 14414 88 39.5 - 18.5 3208 57.0 2414312 787 39.3 -18.7 3209 54.5 3333 3 34 2 77 3210 53.3 22221 77 3211 53.7 1 1 77 3212 54.9 2232223 43 677 3213 56.2 124 422 223 555 S 77 3214 56.0 2 1212 54 77 3215 56.6 44322 45 87 3216 56.8 43223 687 3217 55.3 44432 676 3218 54.5 44444 45 6 3219 51.4 322333 55 2 3220 43.1 22111 133 23 3221 41.8 1111 33 3222 39.9 22 11 3223 41.9 221 3224 41.8 2221 2 1 3225 45.0 333 33 1 1 25.9 -27.1 3226 45.6 3 3 1 1 23.5 -30.5 3227 41.9 2 11 1 27.4 -26.8 3228 41.0 22 212 1 31.6 -22.7 3229 41.8 2 21321 34.6 -19.9 3230 42.6 213311 37.1 -19.5 3231 45.0 33 1 3 213213 36.0 -21.2 3232 45.2 33 213113 33.1 -24.8 3233 46.7 21311 34.1 -23.5 3234 47.8 - 11321 34.3 -23.6 3235 46.4 3 3 1321 36.6 -21.2 3236 44.7 3 214311 38.2 -19.6 3237 48.5 314412 40.9 -16.7 3238 49.0 314412 42.1 -15.9 3239 45. ~ 14412 41.0 -16.9 3240 50.5 45 14413 40.9 -16.4 3241 51.7 55 214514 43.7 -13.3 3242 49.0 4 215513 44.2 -12.8 3243 48.3 34431 2 21551 43.8 -9.5 3244 48.7 12333344 2 45 Plqure Beg. printer plot of the Channel I spectra for the same time range as Channel II in Fig. B-7. The attenuation of the brief tones delimited by the vertical bars demonstrates that Channel II was received by the Channel I radio receiver and not added later.

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Representative terms from entire chapter:

brief tone