4 import TypesettingTricks
9 mapSignal:: (Physical a, Physical b) => (s a b) -> a -> b
10 mapSigList:: (Physical a, Physical b) => (s a b) -> [a] -> [b]
11 toSig:: (Physical a, Physical b) => (s a b) -> SignalRep a b
12 mapSignal = mapSignal . toSig
13 mapSigList = map . mapSignal
14 toSig = FunctionRep . mapSignal
15 instance Signal (->) where
18 data {- (Physical a, Physical b) => -} SignalRep a b =
19 FunctionRep (a -> b) |
20 PieceContRep (PieceCont a b)
22 instance Signal SignalRep where
23 mapSignal (FunctionRep f) = mapSignal f
24 mapSignal (PieceContRep f) = mapSignal f
25 mapSigList (FunctionRep f) = mapSigList f
26 mapSigList (PieceContRep f) = mapSigList f
28 instance (Physical a, Physical b) => Eq (a -> b) where
29 a == b = error "Attempt to apply equality to functions"
30 binop:: (Physical a, Physical b) => (Float -> Float -> Float) ->
31 (a -> b) -> (a -> b) -> a -> b
32 binop op f g t = toPhysical ((fromPhysical (f t)) `op` (fromPhysical (g t)))
33 unop:: (Physical a, Physical b ) => (Float -> Float) ->
35 unop op f t = toPhysical (op (fromPhysical (f t)))
36 instance (Physical a, Physical b) => Num (SignalRep a b) where
37 f + g = FunctionRep (binop (+) (mapSignal f) (mapSignal g))
38 f * g = FunctionRep (binop (*) (mapSignal f) (mapSignal g))
39 negate f = FunctionRep (unop negate (mapSignal f))
40 abs f = FunctionRep (unop abs (mapSignal f))
41 signum f = FunctionRep (unop abs (mapSignal f))
42 fromInteger i = FunctionRep (\t -> toPhysical (fromInteger i))
43 fromInt i = FunctionRep (\t -> toPhysical (fromInt i))
44 instance (Physical a, Physical b) =>
45 Fractional (SignalRep a b) where
46 f / g = FunctionRep (binop (/) (mapSignal f) (mapSignal g))
47 fromRational r = FunctionRep (\t -> (toPhysical (fromRational r)))
48 instance (Physical a, Physical b) =>
49 Floating (SignalRep a b) where
50 pi = FunctionRep (\t -> (toPhysical pi))
51 exp f = FunctionRep (unop exp (mapSignal f))
52 log f = FunctionRep (unop log (mapSignal f))
53 sin f = FunctionRep (unop sin (mapSignal f))
54 cos f = FunctionRep (unop cos (mapSignal f))
55 asin f = FunctionRep (unop asin (mapSignal f))
56 acos f = FunctionRep (unop acos (mapSignal f))
57 atan f = FunctionRep (unop atan (mapSignal f))
58 sinh f = FunctionRep (unop sinh (mapSignal f))
59 cosh f = FunctionRep (unop cosh (mapSignal f))
60 asinh f = FunctionRep (unop asinh (mapSignal f))
61 acosh f = FunctionRep (unop acosh (mapSignal f))
62 atanh f = FunctionRep (unop atanh (mapSignal f))
65 FunctionEvent (Float -> Bool) |
68 instance Eq Event where
69 (TimeEvent x) == (TimeEvent y) = x == y
70 (BurstEvent i e) == (BurstEvent i' e') = (i' == i) && (e' == e)
71 eventOccurs:: Event -> Float -> Float
72 eventOccurs (TimeEvent t) x = if x < t then x else t
73 eventOccurs (FunctionEvent f) x = stepEval f x
74 eventOccurs (BurstEvent i e) x =
78 eventOccurs (BurstEvent (i-1) e) ((eventOccurs e x) + eventEps x)
79 stepEval:: (Float -> Bool) -> Float -> Float
80 stepEval f x = if f x then x else stepEval f (x + eventEps x)
81 data ZeroIndicator = LocalZero | GlobalZero deriving (Eq, Show)
82 data {- (Physical a, Physical b) => -} FunctionWindow a b =
83 Window ZeroIndicator Event (SignalRep a b)
85 data PieceCont a b = Windows [FunctionWindow a b]
87 instance Signal PieceCont where
88 mapSignal (Windows []) t = toPhysical 0.0
89 mapSignal (Windows wl) t = (mapSignal s) (toPhysical t')
90 where (t', (Window z e s), wl') = getWindow 0.0 (fromPhysical t) wl
92 getWindow:: (Physical a, Physical b) =>
93 Float -> Float -> [ FunctionWindow a b ] ->
94 (Float, FunctionWindow a b, [ FunctionWindow a b ])
95 getWindow st t [] = (t, Window LocalZero e f, [])
96 where e = TimeEvent (realmul 2 t)
97 f = FunctionRep (\t -> toPhysical 0.0)
98 getWindow st t (w:wl) = if t' <= wt then (t',w,w:wl)
99 else getWindow (st+wt) t wl
100 where wt = eventOccurs e t'
102 t' = if z == LocalZero then t-st else t
103 (|>) :: (Physical a, Physical b) => FunctionWindow a b ->
104 PieceCont a b -> PieceCont a b
105 w |> (Windows wl) = Windows (w:wl)
106 nullWindow = Windows []
107 cycleWindows:: (Physical a, Physical b) =>
108 PieceCont a b -> PieceCont a b
109 cycleWindows (Windows wl) = Windows (cycle wl)
110 constant:: (Physical a, Physical b) => b -> SignalRep a b
111 constant x = FunctionRep (\t -> x)
112 linear:: (Physical a, Physical b) => Float -> b -> SignalRep a b
113 linear m b = FunctionRep (\x -> toPhysical (realmul m (fromPhysical x) + (fromPhysical b)))
114 sine:: (Physical a, Physical b) =>
115 b -> Frequency -> Float -> SignalRep a b
116 sine mag omeg phase = FunctionRep (\x -> toPhysical (realmul (fromPhysical mag) (sin (realmul (realmul (realmul 2 pi) (fromPhysical omeg)) (fromPhysical x) + phase))))
117 waveform:: (Physical a, Physical b) => a -> [b] -> SignalRep a b
118 waveform samp ampls =
119 let stepSlope y y' = realdiv ((fromPhysical y') - (fromPhysical y)) (fromPhysical samp)
120 makeWin (v,v') = Window LocalZero (TimeEvent (fromPhysical samp))
121 (linear (stepSlope v v') v)
123 in PieceContRep (Windows (map makeWin (zip points (tail points))))
124 random:: (Physical a, Physical b) =>
125 Integer -> a -> SignalRep a b
126 random i s = waveform s (map toPhysical (rand i))
127 ramp:: (Physical a, Physical b) => a -> b -> SignalRep a b
129 let sig = linear (realdiv (fromPhysical v) (fromPhysical per)) (toPhysical 0.0)
130 in PieceContRep (Windows (cycle ([Window LocalZero (TimeEvent (fromPhysical per)) sig ])))
131 triangle:: (Physical a, Physical b) => a -> b -> SignalRep a b
133 let sl = realmul 2.0 (realdiv (fromPhysical v) (fromPhysical per))
134 qper = realdiv (fromPhysical v) 4.0
135 wins = (Window LocalZero (TimeEvent qper) (linear sl (toPhysical 0.0))) |>
136 (Window LocalZero (TimeEvent (realmul 2.0 qper)) (linear (- sl) v)) |>
137 (Window LocalZero (TimeEvent qper) (linear sl (toPhysical (- (fromPhysical v))))) |>
139 in PieceContRep (cycleWindows wins)
140 step:: (Physical a, Physical b) => a -> b -> SignalRep a b
141 step tr lvl = FunctionRep (\t -> if (fromPhysical t) < (fromPhysical tr) then (toPhysical 0.0) else lvl)
142 square:: (Physical a, Physical b) => a -> b -> SignalRep a b
144 let trans = realdiv (fromPhysical per) 2.0
145 nlvl = asTypeOf (toPhysical (- (fromPhysical lvl))) lvl
146 f t = if (fromPhysical t) < trans then lvl else nlvl
147 wins = Windows [Window LocalZero (TimeEvent (fromPhysical per)) (FunctionRep f)]
148 in PieceContRep (cycleWindows wins)
149 pulse:: (Physical a, Physical b) => a -> a -> b -> SignalRep a b
151 let tr = (fromPhysical st) + (fromPhysical wid)
152 f t = if (fromPhysical t) < (fromPhysical st) then (toPhysical 0.0)
153 else if (fromPhysical t) < tr then lvl else (toPhysical 0.0)
155 trap:: (Physical a, Physical b) => a -> a -> a -> a -> b ->
157 trap st r wid f lvl =
158 let stepSlope y y' t = realdiv (y' - y) (fromPhysical t)
159 bigwin = realmul 10000000 ((fromPhysical st) + (fromPhysical wid))
160 wins = Window LocalZero (TimeEvent (fromPhysical st)) (constant (toPhysical 0.0)) |>
161 Window LocalZero (TimeEvent (fromPhysical r)) (linear (stepSlope 0.0 (fromPhysical lvl) r) (toPhysical 0.0)) |>
162 Window LocalZero (TimeEvent (fromPhysical wid)) (constant lvl) |>
163 Window LocalZero (TimeEvent (fromPhysical f)) (linear (stepSlope (fromPhysical lvl) 0.0 f) lvl) |>
164 Window LocalZero (TimeEvent bigwin) (constant (toPhysical 0.0)) |>
167 expc:: (Physical a, Physical b) => Float -> SignalRep a b
168 expc damp = FunctionRep (\t -> toPhysical (exp (- (realmul (fromPhysical t) damp))))
169 data {- (Physical indep, Physical dep) => -} BasicSignal indep dep =
170 Overshoot {start_delay::indep,
173 oscillation::Frequency,
175 | Pulse_dc {start_delay::indep,
182 over::BasicSignal indep dep,
183 under::BasicSignal indep dep}
184 | Pulse_ac {start_delay::indep,
189 frequency::Frequency,
193 data {- (Eq a, Eq b) => -} Foo a b = Foo { x :: a, y :: b}
195 foo :: (Eq a, Eq b) => Foo a b
199 overshoot:: (Physical a, Physical b) => BasicSignal a b
200 overshoot = Overshoot{}
201 pulse_dc:: (Physical a, Physical b) => BasicSignal a b
202 pulse_dc = Pulse_dc {over = Overshoot{start_delay=toPhysical 0.0,
203 ringing=(toPhysical 0.0),
204 oscillation=toPhysical 1.0,
206 under = Overshoot{start_delay=toPhysical 0.0,
207 ringing=(toPhysical 0.0),
208 oscillation=toPhysical 1.0,
210 start_delay = toPhysical 0.0,
211 dc_offset = toPhysical 0.0}
213 pulse_ac:: (Physical a, Physical b) => BasicSignal a b
214 pulse_ac = Pulse_ac {dc_offset = toPhysical 0.0,
215 amplitude = toPhysical 0.0}
218 makeWin:: (Physical a, Physical b) => a -> a ->
219 SignalRep a b -> SignalRep a b
221 let wins = Window LocalZero (TimeEvent (fromPhysical st)) (constant (toPhysical 0.0)) |>
222 Window LocalZero (TimeEvent (fromPhysical wid)) sig |>
225 instance Signal BasicSignal where
226 toSig Overshoot{start_delay,pulse_width,
227 ringing,oscillation,damp_fac} =
228 let ring = sine ringing oscillation 0.0
229 cond = asTypeOf (expc damp_fac) ring
231 temp:: (Physical a, Physical b) => SignalRep a b ->
232 SignalRep a b -> SignalRep a b
233 temp f g = FunctionRep (binop (*) (mapSignal f) (mapSignal g))
235 -- temp f g = asTypeOf (f * g) ring
236 wins = Window LocalZero (TimeEvent (fromPhysical start_delay)) (constant (toPhysical 0.0)) |>
237 Window LocalZero (TimeEvent (fromPhysical pulse_width)) sig |>
240 toSig Pulse_dc{start_delay,rise_time,pulse_width,fall_time,
241 dc_offset,period,amplitude,over,under} =
242 let pul = trap start_delay rise_time pulse_width fall_time amplitude
243 so = toPhysical ((fromPhysical start_delay) + (fromPhysical rise_time))
244 su = toPhysical ((fromPhysical so) + (fromPhysical pulse_width) + (fromPhysical fall_time))
245 oversh = toSig over{start_delay=so}
246 undersh = toSig under{start_delay=su}
247 off = constant dc_offset
248 temp:: (Physical a, Physical b) => SignalRep a b ->
249 SignalRep a b -> SignalRep a b
250 temp f g = FunctionRep (binop (+) (mapSignal f) (mapSignal g))
251 sig = temp (temp (temp pul oversh) undersh) off
252 wins = (Window LocalZero (TimeEvent (fromPhysical period)) sig) |>
254 in PieceContRep (cycleWindows wins)
255 sumSig:: (Physical a, Physical b, Signal s, Signal s') =>
256 (s a b) -> (s' a b) -> SignalRep a b
258 let s1 t = fromPhysical (mapSignal f t)
259 s2 t = fromPhysical (mapSignal f' t)
260 in FunctionRep (\t -> toPhysical ((s1 t) + (s2 t)))
261 mulSig:: (Physical a, Physical b, Signal s, Signal s') =>
262 (s a b) -> (s' a b) -> SignalRep a b
264 let f1 t = fromPhysical (mapSignal f t)
265 f2 t = fromPhysical (mapSignal f' t)
266 in FunctionRep (\t -> toPhysical ((f1 t) * (f2 t)))
268 eventEps:: Float -> Float
269 eventEps x = let eps = realdiv x 1000 in if 0.01 < eps then 0.01 else eps