projects / pdp8.git / blame
| Commit | Line | Data |
|---|---|---|
| 81e70d48 PH |
1 | C -+-+-+-+-+ \ e H A E Y S C . F T \ e -+-+-+-+-+\r |
| 2 | C\r | |
| 3 | C FFT OF THE SCAN DATA STORED ON UNIT 5 (INTENSITIES OF POWER SPECTRUM)\r | |
| 4 | C\r | |
| 5 | SUBROUTINE YSCAN\r | |
| 6 | C\r | |
| 7 | INCLUDE HAEBUF.FI\r | |
| 8 | INCLUDE HAEGSA.FI\r | |
| 9 | INCLUDE HAEPTI.FI\r | |
| 10 | INCLUDE HAEDEF.FI\r | |
| 11 | INCLUDE HAEI85.FI\r | |
| 12 | INCLUDE HAETTY.FI\r | |
| 13 | INCLUDE HABRK.FI\r | |
| 14 | C\r | |
| 15 | INTEGER TOASCI,NCOND,LOG2\r | |
| 16 | REAL INTENS,IMAXNT,COND\r | |
| 17 | EXTERNAL TOASCI,INTENS,IMAXNT,NCOND,LOG2,COND\r | |
| 18 | \fC\r | |
| 19 | INTEGER I,J,K,PNT,BAND, @ DO LOOP COUNTERS & LIMITS\r | |
| 20 | * POSIT,POS1, @ START OF THE ACTUAL WINDOW (SAMRAT*SPAN)*N\r | |
| 21 | * I1,I2, @ INDEX TO COMPLEX SPECTRUM\r | |
| 22 | * LASTIM\r | |
| 23 | INTEGER HH,MM,SS,HHH,MMM,SSS @ START OF FFT, END OF FFT IN MINUTES AND SECONDS\r | |
| 24 | REAL X(2050) @ BUFFER FOR THE FFT\r | |
| 25 | LOGICAL L1, @ TEMPORARY STORAGE\r | |
| 26 | * F1 @ SAMPLE BUFFER EMPTY FLAG\r | |
| 27 | C\r | |
| 28 | C STATEMENT FUNCTIONS ARE:\r | |
| 29 | C\r | |
| 30 | INTEGER DATTIM @ STARTING TIME OF THIS POWER SPECTRUM DATA RECORD WITHIN THE SAMPLE\r | |
| 31 | DATTIM(IP1)=INTE(3,1,MOD(IP1,4)+1)\r | |
| 32 | LOGICAL MUSTRD @ MUSTRD DECIDES IF WE HAVE TO READ THE NEXT INTE RECORD\r | |
| 33 | MUSTRD(IP1)=MOD(IP1,4).EQ.0\r | |
| 34 | C\r | |
| 35 | C OPEN THE INPUT DATA FILE UNIT 5\r | |
| 36 | C READ THE FIRST BLOCK OF THE FILE HEADER AND\r | |
| 37 | C THE DATA HEADER I.E. COMMON CEGSA THE SECOND BLOCK OF UNIT 5\r | |
| 38 | C\r | |
| 39 | IF (REC5.LT.1) DEFINE FILE5(MAXBL5,85,U,REC5)\r | |
| 40 | REC5=1\r | |
| 41 | F1=SAMCNT.EQ.0 .OR. .NOT. COMP @ HEADER OF FILE 5 DOES NOT MATCH THE HEADER OF THE ACTUAL SAMPLE BUFFER\r | |
| 42 | READ (5'REC5) (RCRD0(I),I=1,85) @ READ THE FILE HEADER\r | |
| 43 | IF (F1) SAMCNT=0 @ CLEAR THE ACTUAL SAMPLE BUFFER\r | |
| 44 | IF (F1) COMP=.FALSE. @ AND THE COMPUTATIONS FLAG TOO\r | |
| 45 | IF (REDVAL.NE.6H2DPWLD) GOTO 20 @ RECORD IS EMPTY\r | |
| 46 | REDVAL=0 @ FOR SAVETY ONLY\r | |
| 47 | WRITE (TTO,3) (LABEL(I),I=1,LABCNT) @ TYPE OUT THE LABEL OF THIS DATA SET\r | |
| 48 | READ (5'REC5) LCEGSA(1),(LCEGSA(I),I=2,LCEGSA(1)) @ READ THE DATA HEADER BLOCK ( COMMON CEGESA)\r | |
| 49 | SETNUM=SETNU5 @ INSERT THE NUMBER OF THE ACTUAL DATA SET\r | |
| 50 | CHANEL=CHANE5 @ AND THE NUMBER OF THE CHANNEL INVESTIGATED TOO\r | |
| 51 | C\r | |
| 52 | C\r | |
| 53 | C DO THE FFT\r | |
| 54 | C\r | |
| 55 | IF (REC5.LT.1) DEFINE FILE 5(MAXBL5,85,U,REC5) @ OPEN SCRATCH FILE FOR INTERMEDIATE FFT RESULTS\r | |
| 56 | C\r | |
| 57 | REC5=2\r | |
| 58 | READ (5'REC5) (LCEGSA(I),I=1,LCEGSA(1))\r | |
| 59 | C READ BEGIN AND END OF THE FFT\r | |
| 60 | C\r | |
| 61 | BEGIN=NCOND(PZBEG,PZBEG,BEGIN)\r | |
| 62 | ENDS=MIN0(NCOND(PZEND,PZEND,9999),BEGFFT+4*SPAN)\r | |
| 63 | IF (OPTION.NE.12) CALL ASKHIM(2) @ ASK FOR BEGIN AND ENDS\r | |
| 64 | PZBEG=BEGIN\r | |
| 65 | PZEND=ENDS\r | |
| 66 | WRITE (TTO,4)\r | |
| 67 | READ (TTI,5) BAND\r | |
| 68 | C\r | |
| 69 | C\r | |
| 70 | C\r | |
| 71 | N=0\r | |
| 72 | DO 40 I=0,DATCNT-1 @ LOOP TO FETCH EACH VALUE FROM INPUT FILE\r | |
| 73 | REC5=STSCAN+I/4 @ COMPUTE THE NUMBER OF THE NEXT RECORD TO READ\r | |
| 74 | IF (MUSTRD(I)) READ(5'REC5) INTE85 @ READ THE NEXT DATA SET\r | |
| 75 | IF (DATTIM(I).LT.BEGIN) GOTO 40\r | |
| 76 | IF (DATTIM(I).GT.ENDS) GOTO 45\r | |
| 77 | LASTIM=NCOND(LOG2(N).GT.0,DATTIM(I),LASTIM) @ WE NEED A TWO'S POWER NUMBER OF POINTS FOR THE FFT\r | |
| 78 | N=N+1 @ INCREMENT POINTER IN ORDER\r | |
| 79 | X(N)=INTE(1,BAND,MOD(I,4)+1) @ TO INSERT THE NEXT POINT\r | |
| 80 | 40 CONTINUE\r | |
| 81 | 45 CONTINUE @ WE SCANNED ALL POINTS, SO PREP FOR THE FFT\r | |
| 82 | INCR=2**IABS(LOG2(N)) @ WE NEED A TWO'S POWER NUMBER OF POINTS FOR THE FFT \r | |
| 83 | XMAXI=0 @ FETCH THE MAXIMUM OF THE SPECTRUM\r | |
| 84 | DO 46 I=1,INCR\r | |
| 85 | 46 XMAXI=AMAX1(X(I),XMAXI) @ AND THEN WE FETCH THE MAXIMUM OF THE SPECTRUM\r | |
| 86 | DO 48 I=1,INCR\r | |
| 87 | 48 X(I)=X(I)/XMAXI @ NORM TO THE MAXIMUM TO PREVENT FLOATING OVERFLOW\r | |
| 88 | MM=BEGIN/60\r | |
| 89 | HH=TOASCI(MM/60)\r | |
| 90 | MM=TOASCI(MOD(MM,60))\r | |
| 91 | SS=TOASCI(MOD(BEGIN,60))\r | |
| 92 | MMM=LASTIM/60\r | |
| 93 | HHH=TOASCI(MMM/60)\r | |
| 94 | MMM=TOASCI(MOD(MMM,60))\r | |
| 95 | SSS=TOASCI(MOD(LASTIM,60))\r | |
| 96 | ENDS=LASTIM @ INSERT THE NEW END OF THE COMPUTATION\r | |
| 97 | WRITE (TTO,2) HH,MM,SS,HHH,MMM,SSS,LASTIM,XMAXI\r | |
| 98 | EXPON=LOG2(INCR)\r | |
| 99 | INCR2=INCR/2\r | |
| 100 | CALL FFTC(X,INCR2,EXPON-1,1.) @ BLACK MAGIC BOXES\r | |
| 101 | CALL FFTR(X,INCR2,1.,1.)\r | |
| 102 | CALL HANING (X,INCR2) @ SMOOTH REAL PART\r | |
| 103 | CALL HANING (X(INCR2),INCR2) @ SMOOTH IMAG PART OF FFT\r | |
| 104 | CALL FTPOWR(X,INCR) @ COMPUTE THE POWER SPECTRUM AND THE MINIMUM OF THE SPECTRUM\r | |
| 105 | X(1)=0 @ CLEAR THE FIRST AND SECOND CHANNEL TO\r | |
| 106 | X(2)=0 @ STRIP OFF THE DC OFFSET\r | |
| 107 | XMAXI=0\r | |
| 108 | DO 50 I=1,INCR2 @ COMPUTE THE NEW MAXIMUM OF THE POWER SPECTRUM\r | |
| 109 | 50 XMAXI=AMAX1(XMAXI,X(I))\r | |
| 110 | C\r | |
| 111 | FILTER=0 @ NEW DATA, NOTHING FILTERED\r | |
| 112 | CONTNS=BAND @ REC3 TO 16 CONTAINS A SCAN POWER SPECTRUM\r | |
| 113 | SPAN=1\r | |
| 114 | REC5=2\r | |
| 115 | WRITE (5'REC5) (LCEGSA(I),I=1,LCEGSA(1)) @ WRITE THE DATA HEADER BLOCK ( COMMON CEGESA)\r | |
| 116 | DO 55 J=1,INCR2+84,85 @ SAVE THE LAST POWER SPECTRUM COMPUTED INTO REC 3-27\r | |
| 117 | 55 WRITE (5'REC5) (X(I),I=J,MIN0(1024,J+84)) @ 13 RECORDS TO WRITE\r | |
| 118 | COMP=.TRUE. @ SOME COMPUTATIONS DONE\r | |
| 119 | RETURN\r | |
| 120 | C\r | |
| 121 | C\r | |
| 122 | 20 CONTINUE @ FILE 5 IS EMPTY\r | |
| 123 | COMPUT=0\r | |
| 124 | SAMCNT=0\r | |
| 125 | WRITE (TTO,1) @ NO DATA TO PLOT\r | |
| 126 | RETURN\r | |
| 127 | C\r | |
| 128 | 1 FORMAT (' KEINE DATEN IN DER DATEI 5')\r | |
| 129 | 2 FORMAT (' FFT VON ',2(A2,1H:),A2,' BIS ',2(A2,1H:),A2,I5,\r | |
| 130 | * 1P,E12.2)\r | |
| 131 | 3 FORMAT (1X,14A6)\r | |
| 132 | 4 FORMAT (' NUMMER DES BANDES? ',$)\r | |
| 133 | 5 FORMAT (I1)\r | |
| 134 | END\r | |
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