Home » Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_199201.adf » January92 » !AWJan92/Goodies/ArcAut/Automatons/Sound
!AWJan92/Goodies/ArcAut/Automatons/Sound
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_199201.adf » January92 |
| Filename: | !AWJan92/Goodies/ArcAut/Automatons/Sound |
| Read OK: | ✔ |
| File size: | 04CC bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
AUTOMATON*
Sound_Waves
This uses the HPP_Gas model to perform an experiment. A uniform gas is set
up & into this inserted a compressed region (represented by a solid block
of particles); this corresponds to the air surrounding the source of a loud
burst of noise. As the automaton runs, we observe the compressive
longitudinal wave spreading out from the centre; notice how we are
temporarily left with a vacuum in the centre as the outward bound gas
overshoots. With difficulty you may also be able to see that the incoming
ripple which forms, then compresses the central region & bounces back out,
to create a secondary outward bound wave front of lower intensity than the
first. If you use a relatively small window (say 128x128) you will also
observe patterns formed by the original wavefront wrapping around &
interfering with the other waves.
INITIALISATION*
10DEF PROCdo
20*SetEval wrap on
30*SetEval neig margolus
40ENDPROC
SCREEN*
10DEF PROCdo
20PROCsoup(255,1,.5)
30c%=FNacol(255):GCOL c%AND63 TINT c%
40CIRCLE FILL 0,0,80
50ENDPROC
CODE*
( READ_NEIG
CELL OPP = IF (CW CCW = IF (CELL CW <> IF (CW ==)))
OPP == )
END* 00000000 41 55 54 4f 4d 41 54 4f 4e 2a 0a 0a 20 20 53 6f |AUTOMATON*.. So| 00000010 75 6e 64 5f 57 61 76 65 73 0a 0a 20 20 54 68 69 |und_Waves.. Thi| 00000020 73 20 75 73 65 73 20 74 68 65 20 48 50 50 5f 47 |s uses the HPP_G| 00000030 61 73 20 6d 6f 64 65 6c 20 74 6f 20 70 65 72 66 |as model to perf| 00000040 6f 72 6d 20 61 6e 20 65 78 70 65 72 69 6d 65 6e |orm an experimen| 00000050 74 2e 20 41 20 75 6e 69 66 6f 72 6d 20 67 61 73 |t. A uniform gas| 00000060 20 69 73 20 73 65 74 0a 20 20 75 70 20 26 20 69 | is set. up & i| 00000070 6e 74 6f 20 74 68 69 73 20 69 6e 73 65 72 74 65 |nto this inserte| 00000080 64 20 61 20 63 6f 6d 70 72 65 73 73 65 64 20 72 |d a compressed r| 00000090 65 67 69 6f 6e 20 28 72 65 70 72 65 73 65 6e 74 |egion (represent| 000000a0 65 64 20 62 79 20 61 20 73 6f 6c 69 64 20 62 6c |ed by a solid bl| 000000b0 6f 63 6b 0a 20 20 6f 66 20 70 61 72 74 69 63 6c |ock. of particl| 000000c0 65 73 29 3b 20 74 68 69 73 20 63 6f 72 72 65 73 |es); this corres| 000000d0 70 6f 6e 64 73 20 74 6f 20 74 68 65 20 61 69 72 |ponds to the air| 000000e0 20 73 75 72 72 6f 75 6e 64 69 6e 67 20 74 68 65 | surrounding the| 000000f0 20 73 6f 75 72 63 65 20 6f 66 20 61 20 6c 6f 75 | source of a lou| 00000100 64 0a 20 20 62 75 72 73 74 20 6f 66 20 6e 6f 69 |d. burst of noi| 00000110 73 65 2e 20 41 73 20 74 68 65 20 61 75 74 6f 6d |se. As the autom| 00000120 61 74 6f 6e 20 72 75 6e 73 2c 20 77 65 20 6f 62 |aton runs, we ob| 00000130 73 65 72 76 65 20 74 68 65 20 63 6f 6d 70 72 65 |serve the compre| 00000140 73 73 69 76 65 0a 20 20 6c 6f 6e 67 69 74 75 64 |ssive. longitud| 00000150 69 6e 61 6c 20 77 61 76 65 20 73 70 72 65 61 64 |inal wave spread| 00000160 69 6e 67 20 6f 75 74 20 66 72 6f 6d 20 74 68 65 |ing out from the| 00000170 20 63 65 6e 74 72 65 3b 20 6e 6f 74 69 63 65 20 | centre; notice | 00000180 68 6f 77 20 77 65 20 61 72 65 0a 20 20 74 65 6d |how we are. tem| 00000190 70 6f 72 61 72 69 6c 79 20 6c 65 66 74 20 77 69 |porarily left wi| 000001a0 74 68 20 61 20 76 61 63 75 75 6d 20 69 6e 20 74 |th a vacuum in t| 000001b0 68 65 20 63 65 6e 74 72 65 20 61 73 20 74 68 65 |he centre as the| 000001c0 20 6f 75 74 77 61 72 64 20 62 6f 75 6e 64 20 67 | outward bound g| 000001d0 61 73 0a 20 20 6f 76 65 72 73 68 6f 6f 74 73 2e |as. overshoots.| 000001e0 20 57 69 74 68 20 64 69 66 66 69 63 75 6c 74 79 | With difficulty| 000001f0 20 79 6f 75 20 6d 61 79 20 61 6c 73 6f 20 62 65 | you may also be| 00000200 20 61 62 6c 65 20 74 6f 20 73 65 65 20 74 68 61 | able to see tha| 00000210 74 20 74 68 65 20 69 6e 63 6f 6d 69 6e 67 0a 20 |t the incoming. | 00000220 20 72 69 70 70 6c 65 20 77 68 69 63 68 20 66 6f | ripple which fo| 00000230 72 6d 73 2c 20 74 68 65 6e 20 63 6f 6d 70 72 65 |rms, then compre| 00000240 73 73 65 73 20 74 68 65 20 63 65 6e 74 72 61 6c |sses the central| 00000250 20 72 65 67 69 6f 6e 20 26 20 62 6f 75 6e 63 65 | region & bounce| 00000260 73 20 62 61 63 6b 20 6f 75 74 2c 0a 20 20 74 6f |s back out,. to| 00000270 20 63 72 65 61 74 65 20 61 20 73 65 63 6f 6e 64 | create a second| 00000280 61 72 79 20 6f 75 74 77 61 72 64 20 62 6f 75 6e |ary outward boun| 00000290 64 20 77 61 76 65 20 66 72 6f 6e 74 20 6f 66 20 |d wave front of | 000002a0 6c 6f 77 65 72 20 69 6e 74 65 6e 73 69 74 79 20 |lower intensity | 000002b0 74 68 61 6e 20 74 68 65 0a 20 20 66 69 72 73 74 |than the. first| 000002c0 2e 20 49 66 20 79 6f 75 20 75 73 65 20 61 20 72 |. If you use a r| 000002d0 65 6c 61 74 69 76 65 6c 79 20 73 6d 61 6c 6c 20 |elatively small | 000002e0 77 69 6e 64 6f 77 20 28 73 61 79 20 31 32 38 78 |window (say 128x| 000002f0 31 32 38 29 20 79 6f 75 20 77 69 6c 6c 20 61 6c |128) you will al| 00000300 73 6f 0a 20 20 6f 62 73 65 72 76 65 20 70 61 74 |so. observe pat| 00000310 74 65 72 6e 73 20 66 6f 72 6d 65 64 20 62 79 20 |terns formed by | 00000320 74 68 65 20 6f 72 69 67 69 6e 61 6c 20 77 61 76 |the original wav| 00000330 65 66 72 6f 6e 74 20 77 72 61 70 70 69 6e 67 20 |efront wrapping | 00000340 61 72 6f 75 6e 64 20 26 0a 20 20 69 6e 74 65 72 |around &. inter| 00000350 66 65 72 69 6e 67 20 77 69 74 68 20 74 68 65 20 |fering with the | 00000360 6f 74 68 65 72 20 77 61 76 65 73 2e 0a 0a 49 4e |other waves...IN| 00000370 49 54 49 41 4c 49 53 41 54 49 4f 4e 2a 0a 0a 20 |ITIALISATION*.. | 00000380 20 31 30 44 45 46 20 50 52 4f 43 64 6f 0a 20 20 | 10DEF PROCdo. | 00000390 32 30 2a 53 65 74 45 76 61 6c 20 77 72 61 70 20 |20*SetEval wrap | 000003a0 6f 6e 0a 20 20 33 30 2a 53 65 74 45 76 61 6c 20 |on. 30*SetEval | 000003b0 6e 65 69 67 20 6d 61 72 67 6f 6c 75 73 0a 20 20 |neig margolus. | 000003c0 34 30 45 4e 44 50 52 4f 43 0a 0a 53 43 52 45 45 |40ENDPROC..SCREE| 000003d0 4e 2a 0a 0a 20 20 31 30 44 45 46 20 50 52 4f 43 |N*.. 10DEF PROC| 000003e0 64 6f 0a 20 20 32 30 50 52 4f 43 73 6f 75 70 28 |do. 20PROCsoup(| 000003f0 32 35 35 2c 31 2c 2e 35 29 0a 20 20 33 30 63 25 |255,1,.5). 30c%| 00000400 3d 46 4e 61 63 6f 6c 28 32 35 35 29 3a 47 43 4f |=FNacol(255):GCO| 00000410 4c 20 63 25 41 4e 44 36 33 20 54 49 4e 54 20 63 |L c%AND63 TINT c| 00000420 25 0a 20 20 34 30 43 49 52 43 4c 45 20 46 49 4c |%. 40CIRCLE FIL| 00000430 4c 20 30 2c 30 2c 38 30 0a 20 20 35 30 45 4e 44 |L 0,0,80. 50END| 00000440 50 52 4f 43 0a 0a 43 4f 44 45 2a 0a 0a 28 20 52 |PROC..CODE*..( R| 00000450 45 41 44 5f 4e 45 49 47 0a 20 20 43 45 4c 4c 20 |EAD_NEIG. CELL | 00000460 4f 50 50 20 3d 20 49 46 20 28 43 57 20 43 43 57 |OPP = IF (CW CCW| 00000470 20 3d 20 49 46 20 28 43 45 4c 4c 20 43 57 20 3c | = IF (CELL CW <| 00000480 3e 20 49 46 20 28 43 57 20 3d 3d 29 29 29 0a 20 |> IF (CW ==))). | 00000490 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 000004b0 20 20 20 20 20 20 20 20 20 20 20 4f 50 50 20 3d | OPP =| 000004c0 3d 20 20 20 20 29 0a 0a 45 4e 44 2a |= )..END*| 000004cc
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