diff --git a/src/samples_formats.rs b/src/samples_formats.rs
index dd4c6f1..b350b3b 100644
--- a/src/samples_formats.rs
+++ b/src/samples_formats.rs
@@ -96,11 +96,23 @@ impl Sample for f32 {
     }
 
     fn to_vec_i16(input: &[f32]) -> Cow<Vec<i16>, [i16]> {
-        unimplemented!()
+        Cow::Owned(input.iter().map(|&value| {
+            if value >= 0.0 {
+                (value * 32767.0) as i16
+            } else {
+                (value * 32768.0) as i16
+            }
+        }).collect())
     }
 
     fn to_vec_u16(input: &[f32]) -> Cow<Vec<u16>, [u16]> {
-        unimplemented!()
+        Cow::Owned(input.iter().map(|&value| {
+            if value >= 0.0 {
+                ((value * 32767.0) + 32768.0) as u16
+            } else {
+                ((value * 32768.0) + 32768.0) as u16
+            }
+        }).collect())
     }
 
     fn to_vec_f32(input: &[f32]) -> Cow<Vec<f32>, [f32]> {
@@ -149,14 +161,12 @@ mod test {
     }
 
     #[test]
-    #[ignore]       // TODO: not yet implemented
     fn f32_to_i16() {
         let out = Sample::to_vec_i16(&[0.0f32, -0.5, 1.0, -1.0]).into_owned();
         assert_eq!(out, vec![0, -16384, 32767, -32768]);
     }
 
     #[test]
-    #[ignore]       // TODO: not yet implemented
     fn f32_to_u16() {
         let out = Sample::to_vec_u16(&[-1.0f32, 0.0, 1.0]).into_owned();
         assert_eq!(out, vec![0, 32768, 65535]);