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|00000000| 46 72 6f 6d 20 76 6e 20 | 53 61 74 20 41 75 67 20 |From vn |Sat Aug |
|00000010| 20 33 20 32 32 3a 31 30 | 3a 30 36 20 31 39 39 31 | 3 22:10|:06 1991|
|00000020| 0a 7e 53 75 62 6a 65 63 | 74 3a 20 53 74 65 72 65 |.~Subjec|t: Stere|
|00000030| 6f 20 43 68 6f 72 75 73 | 20 66 6f 72 20 44 53 50 |o Chorus| for DSP|
|00000040| 35 36 30 30 31 20 2d 20 | 63 6f 64 65 20 73 61 6d |56001 - |code sam|
|00000050| 70 6c 65 0a 7e 4e 65 77 | 73 67 72 6f 75 70 73 3a |ple.~New|sgroups:|
|00000060| 20 63 6f 6d 70 2e 64 73 | 70 2c 63 6f 6d 70 2e 6d | comp.ds|p,comp.m|
|00000070| 75 73 69 63 2c 72 65 63 | 2e 6d 75 73 69 63 2e 73 |usic,rec|.music.s|
|00000080| 79 6e 74 68 0a 0a 4f 4b | 2c 20 4f 4b 2c 20 4f 4b |ynth..OK|, OK, OK|
|00000090| 2e 20 20 41 66 74 65 72 | 20 49 20 6d 65 6e 74 69 |.  After| I menti|
|000000a0| 6f 6e 65 64 20 69 6e 20 | 70 61 73 73 69 6e 67 20 |oned in |passing |
|000000b0| 6f 6e 65 20 64 61 79 20 | 74 68 61 74 20 49 27 64 |one day |that I'd|
|000000c0| 20 62 65 65 6e 20 77 6f | 72 6b 69 6e 67 20 6f 6e | been wo|rking on|
|000000d0| 20 73 6f 6d 65 0a 65 66 | 66 65 63 74 73 20 63 6f | some.ef|fects co|
|000000e0| 64 65 20 66 6f 72 20 74 | 68 65 20 35 36 30 30 31 |de for t|he 56001|
|000000f0| 20 49 20 67 6f 74 20 71 | 75 69 74 65 20 61 20 66 | I got q|uite a f|
|00000100| 65 77 20 71 75 65 72 69 | 65 73 2e 20 20 57 65 6c |ew queri|es.  Wel|
|00000110| 6c 2c 20 68 65 72 65 27 | 73 20 6d 79 20 73 74 6f |l, here'|s my sto|
|00000120| 72 79 2e 0a 49 20 68 61 | 76 65 20 77 6f 72 6b 69 |ry..I ha|ve worki|
|00000130| 6e 67 20 6f 6e 20 6d 79 | 20 35 36 4b 20 62 6f 61 |ng on my| 56K boa|
|00000140| 72 64 20 72 65 76 65 72 | 62 2c 20 63 68 6f 72 75 |rd rever|b, choru|
|00000150| 73 2c 20 66 6c 61 6e 67 | 65 20 61 6e 64 20 63 6f |s, flang|e and co|
|00000160| 6d 62 69 6e 61 74 69 6f | 6e 73 20 6f 66 20 74 68 |mbinatio|ns of th|
|00000170| 65 6d 2e 0a 54 68 65 20 | 63 68 6f 72 75 73 20 61 |em..The |chorus a|
|00000180| 6e 64 20 66 6c 61 6e 67 | 65 20 49 20 63 61 6d 65 |nd flang|e I came|
|00000190| 20 75 70 20 77 69 74 68 | 20 61 66 74 65 72 20 70 | up with| after p|
|000001a0| 6c 61 79 69 6e 67 20 77 | 69 74 68 20 61 6e 64 20 |laying w|ith and |
|000001b0| 61 6e 61 6c 79 7a 69 6e | 67 20 61 0a 63 6f 6d 6d |analyzin|g a.comm|
|000001c0| 65 72 63 69 61 6c 20 63 | 68 6f 72 75 73 20 70 65 |ercial c|horus pe|
|000001d0| 64 61 6c 2e 20 20 49 20 | 6c 6f 6f 6b 65 64 20 61 |dal.  I |looked a|
|000001e0| 74 20 74 68 65 20 69 6d | 70 75 6c 73 65 20 72 65 |t the im|pulse re|
|000001f0| 73 70 6f 6e 73 65 20 61 | 6e 64 20 64 65 6c 61 79 |sponse a|nd delay|
|00000200| 2d 74 69 6d 65 0a 63 68 | 61 72 61 63 74 65 72 69 |-time.ch|aracteri|
|00000210| 73 74 69 63 73 20 6f 66 | 20 74 68 65 20 62 6f 78 |stics of| the box|
|00000220| 20 6f 6e 20 61 20 73 63 | 6f 70 65 2e 20 20 49 20 | on a sc|ope.  I |
|00000230| 66 65 65 6c 20 4f 4b 20 | 61 62 6f 75 74 20 72 65 |feel OK |about re|
|00000240| 6c 65 61 73 69 6e 67 20 | 6d 79 20 63 68 6f 72 75 |leasing |my choru|
|00000250| 73 0a 61 6e 64 20 66 6c | 61 6e 67 65 20 63 6f 64 |s.and fl|ange cod|
|00000260| 65 2e 20 20 54 68 65 20 | 63 68 6f 72 75 73 20 63 |e.  The |chorus c|
|00000270| 6f 64 65 20 69 73 20 61 | 74 74 61 63 68 65 64 2e |ode is a|ttached.|
|00000280| 0a 0a 42 75 74 2c 20 6d | 79 20 68 61 6e 67 75 70 |..But, m|y hangup|
|00000290| 20 77 69 74 68 20 74 68 | 65 20 72 65 76 65 72 62 | with th|e reverb|
|000002a0| 20 69 73 20 74 68 61 74 | 20 49 20 75 73 65 64 20 | is that| I used |
|000002b0| 74 68 65 20 66 69 6c 74 | 65 72 20 63 6f 6e 66 69 |the filt|er confi|
|000002c0| 67 75 72 61 74 69 6f 6e | 20 61 6e 64 0a 63 6f 65 |guration| and.coe|
|000002d0| 66 66 69 63 69 65 6e 74 | 73 20 66 72 6f 6d 20 63 |fficient|s from c|
|000002e0| 73 6f 75 6e 64 2e 20 20 | 49 20 63 6f 75 6c 64 20 |sound.  |I could |
|000002f0| 70 72 6f 62 61 62 6c 79 | 20 67 69 76 65 20 63 72 |probably| give cr|
|00000300| 65 64 69 74 20 74 6f 20 | 44 72 2e 20 56 65 72 63 |edit to |Dr. Verc|
|00000310| 6f 65 20 61 6e 64 0a 72 | 65 6c 65 61 73 65 20 74 |oe and.r|elease t|
|00000320| 68 65 20 63 6f 64 65 2c | 20 62 75 74 20 77 68 69 |he code,| but whi|
|00000330| 6c 65 20 49 20 61 6d 20 | 71 75 69 74 65 20 70 6c |le I am |quite pl|
|00000340| 65 61 73 65 64 20 77 69 | 74 68 20 74 68 65 20 70 |eased wi|th the p|
|00000350| 65 72 66 6f 72 6d 61 6e | 63 65 20 6f 66 20 74 68 |erforman|ce of th|
|00000360| 65 0a 61 6c 67 6f 72 69 | 74 68 6d 2c 20 49 20 77 |e.algori|thm, I w|
|00000370| 6f 75 6c 64 20 6c 69 6b | 65 20 74 6f 20 74 77 65 |ould lik|e to twe|
|00000380| 61 6b 20 69 74 20 61 6e | 64 20 65 78 70 61 6e 64 |ak it an|d expand|
|00000390| 20 6f 6e 20 69 74 20 74 | 6f 20 62 65 74 74 65 72 | on it t|o better|
|000003a0| 20 6d 61 74 63 68 20 69 | 74 20 74 6f 0a 6d 79 20 | match i|t to.my |
|000003b0| 73 61 6d 70 6c 65 20 72 | 61 74 65 2e 20 20 54 68 |sample r|ate.  Th|
|000003c0| 65 20 35 36 30 30 31 20 | 68 61 73 20 73 75 64 73 |e 56001 |has suds|
|000003d0| 20 6c 65 66 74 20 6f 76 | 65 72 20 28 49 20 72 75 | left ov|er (I ru|
|000003e0| 6e 20 61 74 20 32 35 20 | 4d 48 7a 29 2e 20 20 49 |n at 25 |MHz).  I|
|000003f0| 20 72 65 6d 65 6d 62 65 | 72 20 61 6e 20 0a 61 72 | remembe|r an .ar|
|00000400| 74 69 63 6c 65 20 49 20 | 73 61 77 20 69 6e 20 74 |ticle I |saw in t|
|00000410| 68 65 20 43 6f 6d 70 75 | 74 65 72 20 4d 75 73 69 |he Compu|ter Musi|
|00000420| 63 20 4a 6f 75 72 6e 61 | 6c 20 62 79 20 44 72 2e |c Journa|l by Dr.|
|00000430| 20 4d 6f 6f 72 65 72 20 | 28 49 20 74 68 69 6e 6b | Moorer |(I think|
|00000440| 29 0a 77 68 65 72 65 20 | 68 65 20 64 69 73 63 75 |).where |he discu|
|00000450| 73 73 65 64 20 66 69 6c | 74 65 72 73 20 66 6f 72 |ssed fil|ters for|
|00000460| 20 72 65 76 65 72 62 2e | 20 20 49 20 77 61 73 20 | reverb.|  I was |
|00000470| 68 6f 70 69 6e 67 20 74 | 6f 20 67 65 74 20 61 20 |hoping t|o get a |
|00000480| 68 6f 6c 64 20 6f 66 20 | 68 69 73 0a 70 61 70 65 |hold of |his.pape|
|00000490| 72 20 61 67 61 69 6e 20 | 74 6f 20 61 74 74 65 6d |r again |to attem|
|000004a0| 70 74 20 74 6f 20 74 75 | 6e 65 20 74 68 65 20 63 |pt to tu|ne the c|
|000004b0| 6f 64 65 2e 20 20 49 20 | 74 68 69 6e 6b 20 49 20 |ode.  I |think I |
|000004c0| 6e 65 65 64 20 61 6e 6f | 74 68 65 72 20 63 6f 6d |need ano|ther com|
|000004d0| 62 20 66 69 6c 74 65 72 | 0a 6f 72 20 74 77 6f 2e |b filter|.or two.|
|000004e0| 20 20 54 68 65 20 73 6f | 75 6e 64 20 69 73 20 61 |  The so|und is a|
|000004f0| 20 62 69 74 20 22 67 72 | 61 69 6e 79 22 20 6f 6e | bit "gr|ainy" on|
|00000500| 20 68 69 67 68 73 2e 0a | 0a 42 75 74 2c 20 61 6e | highs..|.But, an|
|00000510| 79 68 6f 77 2c 20 68 65 | 72 65 20 69 73 20 73 6f |yhow, he|re is so|
|00000520| 6d 65 20 73 61 6d 70 6c | 65 20 63 6f 64 65 20 66 |me sampl|e code f|
|00000530| 6f 72 20 63 68 6f 72 75 | 73 2e 20 20 43 68 6f 72 |or choru|s.  Chor|
|00000540| 75 73 20 75 73 65 73 20 | 61 20 73 69 6e 67 6c 65 |us uses |a single|
|00000550| 0a 64 65 6c 61 79 2d 6c | 69 6e 65 20 77 69 74 68 |.delay-l|ine with|
|00000560| 20 74 69 6d 65 2d 76 61 | 72 79 69 6e 67 20 64 65 | time-va|rying de|
|00000570| 6c 61 79 20 74 69 6d 65 | 2e 20 20 46 6c 61 6e 67 |lay time|.  Flang|
|00000580| 65 20 69 73 20 76 65 72 | 79 20 73 69 6d 69 6c 61 |e is ver|y simila|
|00000590| 72 2c 20 77 69 74 68 0a | 73 68 6f 72 74 65 72 20 |r, with.|shorter |
|000005a0| 64 65 6c 61 79 20 61 6e | 64 20 66 65 65 64 62 61 |delay an|d feedba|
|000005b0| 63 6b 2c 20 62 75 69 6c | 64 69 6e 67 20 65 66 66 |ck, buil|ding eff|
|000005c0| 65 63 74 69 76 65 6c 79 | 20 61 20 74 69 6d 65 2d |ectively| a time-|
|000005d0| 76 61 72 79 69 6e 67 20 | 63 6f 6d 62 0a 66 69 6c |varying |comb.fil|
|000005e0| 74 65 72 2e 20 20 52 65 | 76 65 72 62 20 28 61 73 |ter.  Re|verb (as|
|000005f0| 20 69 6d 70 6c 65 6d 65 | 6e 74 65 64 20 69 6e 20 | impleme|nted in |
|00000600| 63 73 6f 75 6e 64 29 20 | 75 73 65 73 20 66 6f 75 |csound) |uses fou|
|00000610| 72 20 63 6f 6d 62 20 66 | 69 6c 74 65 72 73 20 61 |r comb f|ilters a|
|00000620| 6e 64 0a 74 68 65 6e 20 | 74 77 6f 20 61 6c 6c 2d |nd.then |two all-|
|00000630| 70 61 73 73 20 66 69 6c | 74 65 72 73 2e 20 20 43 |pass fil|ters.  C|
|00000640| 6f 6d 6d 65 72 63 69 61 | 6c 20 72 65 76 65 72 62 |ommercia|l reverb|
|00000650| 20 6d 61 6b 65 72 73 20 | 61 72 65 20 76 65 72 79 | makers |are very|
|00000660| 20 70 72 6f 74 65 63 74 | 69 76 65 0a 6f 66 20 74 | protect|ive.of t|
|00000670| 68 65 69 72 20 72 65 73 | 70 65 63 74 69 76 65 20 |heir res|pective |
|00000680| 61 6c 67 6f 72 69 74 68 | 6d 73 2e 0a 0a 42 79 20 |algorith|ms...By |
|00000690| 74 68 65 20 77 61 79 2c | 20 49 20 64 6f 20 6e 6f |the way,| I do no|
|000006a0| 74 20 75 73 65 20 74 68 | 65 20 4d 6f 74 6f 72 6f |t use th|e Motoro|
|000006b0| 6c 61 20 61 73 73 65 6d | 62 6c 65 72 20 62 75 74 |la assem|bler but|
|000006c0| 20 6f 6e 65 20 74 68 61 | 74 20 49 20 77 72 6f 74 | one tha|t I wrot|
|000006d0| 65 20 75 73 69 6e 67 0a | 59 41 43 43 20 61 6e 64 |e using.|YACC and|
|000006e0| 20 4c 45 58 2e 20 20 49 | 74 20 77 61 73 20 68 61 | LEX.  I|t was ha|
|000006f0| 72 64 65 72 20 74 68 61 | 6e 20 49 20 74 68 6f 75 |rder tha|n I thou|
|00000700| 67 68 74 20 61 6e 64 20 | 49 20 64 6f 6e 27 74 20 |ght and |I don't |
|00000710| 6c 69 6b 65 20 74 68 65 | 20 77 61 79 20 74 68 65 |like the| way the|
|00000720| 0a 67 72 61 6d 6d 61 72 | 20 74 75 72 6e 65 64 20 |.grammar| turned |
|00000730| 6f 75 74 2e 20 20 42 75 | 74 20 69 74 20 64 6f 65 |out.  Bu|t it doe|
|00000740| 73 20 77 6f 72 6b 2e 20 | 20 57 6f 75 6c 64 20 61 |s work. | Would a|
|00000750| 6e 79 20 6f 66 20 79 6f | 75 20 44 53 50 20 68 61 |ny of yo|u DSP ha|
|00000760| 63 6b 73 20 6c 69 6b 65 | 0a 61 20 64 6f 63 75 6d |cks like|.a docum|
|00000770| 65 6e 74 61 74 69 6f 6e | 6c 65 73 73 20 61 73 73 |entation|less ass|
|00000780| 65 6d 62 6c 65 72 20 66 | 6f 72 20 74 68 65 20 35 |embler f|or the 5|
|00000790| 36 30 30 31 3f 20 20 49 | 27 76 65 20 62 65 65 6e |6001?  I|'ve been|
|000007a0| 20 76 65 72 79 20 74 65 | 6d 70 74 65 64 20 74 6f | very te|mpted to|
|000007b0| 0a 70 6f 73 74 20 69 74 | 2c 20 74 6f 6f 2c 20 62 |.post it|, too, b|
|000007c0| 75 74 20 77 61 73 20 61 | 66 72 61 69 64 20 6f 66 |ut was a|fraid of|
|000007d0| 20 74 61 6b 69 6e 67 20 | 6f 6e 20 74 68 65 20 73 | taking |on the s|
|000007e0| 75 70 70 6f 72 74 20 69 | 73 73 75 65 73 2e 0a 0a |upport i|ssues...|
|000007f0| 49 20 67 75 65 73 73 20 | 49 27 6c 6c 20 70 6f 73 |I guess |I'll pos|
|00000800| 74 20 6d 79 20 63 6f 6d | 6d 65 6e 74 2d 6c 65 61 |t my com|ment-lea|
|00000810| 6e 20 66 6c 61 6e 67 65 | 20 63 6f 64 65 20 61 73 |n flange| code as|
|00000820| 20 77 65 6c 6c 2e 20 20 | 54 68 65 20 63 6f 6d 6d | well.  |The comm|
|00000830| 65 6e 74 73 0a 69 6e 20 | 74 68 65 20 63 68 6f 72 |ents.in |the chor|
|00000840| 75 73 20 63 6f 64 65 20 | 77 69 6c 6c 20 68 65 6c |us code |will hel|
|00000850| 70 2e 0a 0a 45 6e 6a 6f | 79 2c 0a 0a 51 75 69 6e |p...Enjo|y,..Quin|
|00000860| 6e 20 4a 65 6e 73 65 6e | 0a 77 6f 72 6b 3a 20 6a |n Jensen|.work: j|
|00000870| 65 6e 73 65 6e 71 40 6e | 70 64 2e 6e 6f 76 65 6c |ensenq@n|pd.novel|
|00000880| 6c 2e 63 6f 6d 0a 68 6f | 6d 65 3a 20 6a 65 6e 73 |l.com.ho|me: jens|
|00000890| 65 6e 71 40 71 63 6a 2e | 69 63 6f 6e 2e 63 6f 6d |enq@qcj.|icon.com|
|000008a0| 0a                      |                         |.       |        |
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