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changeset 183:7cfcc3a07177

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Make generator function take sample number, not time in seconds -- simpler and more consistent with other uses of plain numbers in this module
author Chris Cannam
date Fri, 03 May 2013 18:11:56 +0100
parents 1ab130dcf7f3
children 045908c861a4
files yetilab/stream/syntheticstream.yeti yetilab/stream/test/test_filter.yeti yetilab/stream/test/test_syntheticstream.yeti
diffstat 3 files changed, 18 insertions(+), 19 deletions(-) [+]
line wrap: on
line diff
--- a/yetilab/stream/syntheticstream.yeti	Fri May 03 18:00:48 2013 +0100
+++ b/yetilab/stream/syntheticstream.yeti	Fri May 03 18:11:56 2013 +0100
@@ -8,7 +8,7 @@
 load yetilab.stream.streamtype;
 
 generated sampleRate generator =
-   (// generator takes time in seconds as arg, returns number in -1,+1 range
+   (// generator takes sample number as arg, returns number in -1,+1 range
     var position = 0;
     {
         get position () = position,
@@ -19,7 +19,7 @@
         read count = ch.deinterleaved 1
            (result = vec.zeros count;
             for [0..count-1] do i:
-                result[i] := generator ((position + i) / sampleRate)
+                result[i] := generator (position + i)
             done;
             position := position + count;
             block.block result),
@@ -27,7 +27,7 @@
     });
 
 sinusoid rate freq =
-    generated rate (sin . (* (2 * pi * freq)));
+    generated rate (sin . (* (2 * pi * freq / rate)));
 
 whiteNoise rate =
     generated rate \((Math#random() * 2.0) - 1.0);
--- a/yetilab/stream/test/test_filter.yeti	Fri May 03 18:00:48 2013 +0100
+++ b/yetilab/stream/test/test_filter.yeti	Fri May 03 18:11:56 2013 +0100
@@ -18,7 +18,7 @@
         compare str.sampleRate 2 and
         compare str.available (Known 3) and
         compare str.finished? false and
-        compare (bl.list ((str.read 4).getRow 0)) [ 0, 0.5, 1 ] and
+        compare (bl.list ((str.read 4).getRow 0)) [ 0,1,2 ] and
         compare str.position 3 and
         compare str.available (Known 0) and
         compare str.finished? true and
@@ -32,7 +32,7 @@
         compare str.sampleRate 2 and
         compare str.available (Known 3) and
         compare str.finished? false and
-        compare (bl.list ((str.read 4).getRow 0)) [ 0, 0.5, 1 ] and
+        compare (bl.list ((str.read 4).getRow 0)) [ 0,1,2 ] and
         compare str.position 3 and
         compare str.available (Known 0) and
         compare str.finished? true and
@@ -46,7 +46,7 @@
         compare str.sampleRate 2 and
         compare str.available (Infinite ()) and
         compare str.finished? false and
-        compare (bl.list ((str.read 4).getRow 0)) [ 0, 0.5, 1, 1.5 ] and
+        compare (bl.list ((str.read 4).getRow 0)) [ 0,1,2,3 ] and
         compare str.position 4 and
         compare str.available (Infinite ()) and
         compare str.finished? false and
@@ -60,11 +60,11 @@
         compare str.sampleRate 2 and
         compare str.available (Known 5) and
         compare str.finished? false and
-        compare (bl.list ((str.read 4).getRow 0)) [ 0, 0, 0, 0.5 ] and
+        compare (bl.list ((str.read 4).getRow 0)) [ 0,0,0,1 ] and
         compare str.position 4 and
         compare str.available (Known 1) and
         compare str.finished? false and
-        compare (bl.list ((str.read 4).getRow 0)) [ 1 ] and
+        compare (bl.list ((str.read 4).getRow 0)) [ 2 ] and
         compare str.position 5 and
         compare str.available (Known 0) and
         compare str.finished? true and
@@ -82,7 +82,7 @@
         compare str.position 1 and
         compare str.available (Known 4) and
         compare str.finished? false and
-        compare (bl.list ((str.read 4).getRow 0)) [ 0, 0, 0.5, 1 ] and
+        compare (bl.list ((str.read 4).getRow 0)) [ 0,0,1,2 ] and
         compare str.position 5 and
         compare str.available (Known 0) and
         compare str.finished? true and
@@ -96,13 +96,13 @@
         compare str.sampleRate 2 and
         compare str.available (Infinite ()) and
         compare str.finished? false and
-        compare (bl.list ((str.read 2).getRow 0)) [ 0, 0 ] and
+        compare (bl.list ((str.read 2).getRow 0)) [ 0,0 ] and
         compare str.position 2 and
         compare str.finished? false and
-        compare (bl.list ((str.read 2).getRow 0)) [ 0, 0.5 ] and
+        compare (bl.list ((str.read 2).getRow 0)) [ 0,1 ] and
         compare str.position 4 and
         compare str.finished? false and
-        compare (bl.list ((str.read 2).getRow 0)) [ 1, 1.5 ] and
+        compare (bl.list ((str.read 2).getRow 0)) [ 2,3 ] and
         compare str.position 6 and
         compare str.finished? false and
         ( str.close (); true )
@@ -116,7 +116,7 @@
         compare str.available (Infinite ()) and
         compare str.finished? false and
         compare (map bl.list (mat.asRows (str.read 4)))
-            [[0,0.5,1.0,1.5], [0,-0.5,-1,-1.5]] and
+            [[0,1,2,3], [0,-1,-2,-3]] and
         compare str.available (Infinite ()) and
         compare str.position 4 and
         ( str.close (); true )
@@ -129,8 +129,7 @@
         compare str.sampleRate 2 and
         compare str.available (Known 3) and
         compare str.finished? false and
-        compare (map bl.list (mat.asRows (str.read 4)))
-            [[0,0.5,1.0], [0,-0.5,-1]] and
+        compare (map bl.list (mat.asRows (str.read 4))) [[0,1,2], [0,-1,-2]] and
         compare str.available (Known 0) and
         compare str.finished? true and
         compare str.position 3 and
@@ -146,7 +145,7 @@
         compare str.sampleRate 2 and
         compare str.available (Known 2) and
         compare str.finished? false and
-        compare (map bl.list (mat.asRows (str.read 4))) [[1,2], [0,-0.5]] and
+        compare (map bl.list (mat.asRows (str.read 4))) [[1,2], [0,-1]] and
         compare str.available (Known 0) and
         compare str.finished? true and
         compare str.position 2 and
@@ -163,7 +162,7 @@
         compare str.sampleRate 2 and
         compare str.available (Known 2) and
         compare str.finished? false and
-        compare (map bl.list (mat.asRows (str.read 4))) [[1,2], [3,4], [0,-0.5]] and
+        compare (map bl.list (mat.asRows (str.read 4))) [[1,2], [3,4], [0,-1]] and
         compare str.available (Known 0) and
         compare str.finished? true and
         compare str.position 2 and
@@ -180,7 +179,7 @@
         compare str.sampleRate 2 and
         compare str.available (Known 2) and
         compare str.finished? false and
-        compare (map bl.list (mat.asRows (str.read 4))) [[1,2], [3,4], [0,-0.5]] and
+        compare (map bl.list (mat.asRows (str.read 4))) [[1,2], [3,4], [0,-1]] and
         compare str.available (Known 0) and
         compare str.finished? true and
         compare str.position 2 and
--- a/yetilab/stream/test/test_syntheticstream.yeti	Fri May 03 18:00:48 2013 +0100
+++ b/yetilab/stream/test/test_syntheticstream.yeti	Fri May 03 18:11:56 2013 +0100
@@ -21,7 +21,7 @@
         compare str.sampleRate 2 and
         compare str.available (Infinite ()) and
         compare str.finished? false and
-        compare (bl.list ((str.read 4).getRow 0)) [ 0, 0.5, 1, 1.5 ] and
+        compare (bl.list ((str.read 4).getRow 0)) [ 0,1,2,3 ] and
         compare str.position 4
 ),