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--- audio:rew:time-alignment [2025/12/21 18:45] – created oscar
+++ audio:rew:time-alignment [2026/01/02 12:14] (current) – [Alignment] oscar
@@ Line 1: / Line 1: @@
 ====== Alignment ======
+----
+Use Overlays to see the impulse response for multiple measurements in one view.
+===== Measurements timing information =====
+=== Measurement without timing ===
+If a measurement was done without the option: “Use accoustic timing reference” there is no timing information and aligning is not required. REW will automatically have the Pulse Responses starting at 0 ms.
+{{ :audio:rew:rew-impulse-response-no-timing-ref.jpg?400 |}}
+=== Measurement with timing ===
+If a measurement was done with the option: “Use accoustic timing reference” there is timing information and aligning might be required. REW will show timing information with the Pulse Responses.
+{{ :audio:rew:rew-impulse-response-with-timing-ref.jpg?400 |}}
+===== Set t=0 Manually =====
+You can manually define the t=0 for a particular measurement, by the following steps:
+  - Select the proper measurement and select the "Impulse" tab.
+  - Press action and put the curser where t=0 should be
+  - Press "Set t=0 at cursor"
+{{ :audio:rew:rew-adjust-pulse-timing-2.jpg?600 |}}
+===== Shift Adjust Manually =====
+You can manually define an offset for a particular measurement, by the following steps:
+  - Select the proper measurement and select the "Impulse" tab.
+  - Press action
+  - Press "Offset t=0"
+  - Adjust the offset
+{{ :audio:rew:rew-adjust-pulse-timing-1.jpg?600 |}}
 ===== Cross Correlation Align =====
+REW can automatically time align several measurements, by the following steps:
+  - In the "All SPL" tab select all the measurements that need to be aligned
+  - Put the measurement that is at t=0 at the top of the measurement list. REW will align all selected measurements to the first selected measurement.
+  - You can open an overlay with the impulse responses to see the effect of the alignment.
+  - Press "Cross Corr Align"
+{{ :audio:rew:rew-adjust-pulse-timing-3a.jpg?600 |}}
+{{ :audio:rew:rew-adjust-pulse-timing-3b.jpg?600 |}}