[obsidian] vault backup: 2023-09-20 15:12:21[
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@ -271,10 +271,11 @@ struct FuncProto{
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この関数だけだとfeedidをどうつければいいかなあ
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```rust
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fn filterbank(N,input,lowestfreq, margin,Q,filter){
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fn filterbank(N,input,lowestfreq, margin,filter){
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if(N>0){
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return filter(input,lowestfreq+N*margin,Q)
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+ filterbank(N-1,input, lowestfreq,margin,Q,filter)
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let freq = lowestfreq+N*margin;
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return filter(input,freq)
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+ filterbank(N-1,input,lowestfreq,margin,filter)
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}else{
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return 0
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}
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@ -282,8 +283,64 @@ fn filterbank(N,input,lowestfreq, margin,Q,filter){
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fn lowpass(input,fb){
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input* (1-fb) + self * fb
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}
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let lowpass = |input,fb|{feed(y) {
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input* (1-fb) + y * fb
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}} }
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let lowpass = |input,fb,ref_y|{
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let res = input* (1-fb)+ deref(ref_y)*fb
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ref_y := res
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res
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}
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res = filterbank(3,input,100,2000,2.0,lowpass)
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```
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lowpassは最終的にlambda{feed{self}}的な感じになるが、それはfilterbankの中で呼ばれるまではわからない
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lowpassのバイトコードはこんな感じか
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```
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lowpass: //stack 0:input, 1: fb
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moveconst 2 0
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sub 3 1 2
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getfeed 4
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mult 5 2 4
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add 6 3 5
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retfeed 6 1
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const:
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1_i64
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upindexes:
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//nothing
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```
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```
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global_ftable:
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lowpass
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filterbank
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filterbank: //stack 0:N,1:input,2:lfreq,3:margin,4:filter
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moveconst 5 0
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gt 6 0 5
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jmpifneg 6 16
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mult 6 0 3
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add 7 2 0
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move 6 6 7
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move 7 4 // get filter
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move 8 1
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move 9 6
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call 7 2 1 //result on stack 7
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moveconst 8 1
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sub 9 0 8
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move 10 -1 // get recursive call
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move 11 9 // prepare arguments...
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move 12 1
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move 13 2
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move 14 3
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move 15 4
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call 10 5 1 //recursive call, result on stack 10
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add 0 7 10
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jmp 1
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moveconst 0 0
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ret 0 1
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const:
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0_i64 -1_u64
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```
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feedが呼ばれた時にどのfeedidかを判別するのはランタイム側の役目
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