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--- en:wiki:anhang:anleitungen:erkennen_von_reflexionen_in_der_pulsantwort [14/01/2019 13:00] – uli
+++ en:wiki:anhang:anleitungen:erkennen_von_reflexionen_in_der_pulsantwort [14/01/2019 18:57] (current) – murray_t
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-**This page is not fully translated, yet. Please help completing the translation.** \\
-//(remove this paragraph once the translation is finished)//
 ====== Recognition of disturbing spatial reflections in the pulse response ======
-For a good stereo image, a balanced ratio of direct and diffused sound is necessary. Above all, early reflections caused by the room or the interior contents can have a disturbing effect. The sound is reflected from the room or the room contents and mixes with the direct sound from the speaker. Good stereo localization is guaranteed if the first 0.2 seconds consists of undisturbed direct sound.
+For a good stereo image, a balanced ratio of direct and diffused sound is necessary. Above all, early reflections caused by the room or the interior contents can have a disturbing effect. The sound is reflected from the room or the room contents and mixes with the direct sound from the speaker. Good stereo localization is guaranteed if the first 0.02 seconds (20 milliseconds) consists of undisturbed direct sound (Footnote 1)
 With Acourate, one can determine both the strength and source location of disturbing reflections. Depending on the cause of reflections, these can then be diminished by different methods. On walls one can place absorbers, on the floor, high-pile carpets, possibly even furniture can be moved. The success or failure of these measures can then be compared again with a new measurement with Acourate.
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 {{:wiki:anhang:anleitungen:reflexionen:06_anl_reflexionen.png?nolink&}}
-. Mit der rechten Maustaste nun auf einen Peak weiter rechts im Time Fenster klicken.\\
+. <font 12.0pt/inherit;;inherit;;inherit>Right-click on a peak further to the right in the Time window.</font>\\
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 {{:wiki:anhang:anleitungen:reflexionen:07_anl_reflexionen.png?nolink&}}
-. Rechts vom Time-Fenster erscheint nun die Angabe, welche Strecke der Schall zusätzlich unterwegs war, bis er beim Hörplatz eingetroffen ist.\\
+. <font 12.0pt/inherit;;inherit;;inherit>On the right side of the time window, you can see the distance the reflected sound traveled in addition to the direct sound until it arrived at the listening position.</font>\\
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 {{:wiki:anhang:anleitungen:reflexionen:08_anl_reflexionen.png?nolink&}}
-Reflexionen welche nur aus dem linken oder rechten Kanal eintreffen wirken sich besonders negativ aus, weil sie die notwendige Symmetrie zum Funktionieren des Stereo-Systems stören.\\
+<font 12.0pt/inherit;;inherit;;inherit>Reflections which only come from the left or right channel have a particularly negative effect because they disturb the necessary symmetry for the functioning of the stereo system</font> .\\
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 {{:wiki:anhang:anleitungen:reflexionen:09_anl_reflexionen.png?nolink&}}
-. Hat man die Strecke ausgemessen, welche der Schall zusätzlich benötigt kann der Verursacher folgendermaßen ermittelt werden: Man spannt eine Schnur vom Hochtöner des Lautsprechers zum Hörplatz, verlängert die Schnur um die angegebene Strecke und ermittelt welche Flächen sich mit der Schnur berühren lassen: Die Blaue Linie ist der Weg des Direktschalls vom Lautsprecher zum Messmikrofon. Die rote Linie ist der längere Weg des Diffusschalls. Statt einer Schnur ist die Verwendung eines Laser-Entfernungsmessers hilfreich. So können auch leichter Reflexionspunkte von der Decke des Hörraums ausgemessen werden.
+. <font 12.0pt/inherit;;inherit;;inherit>Once you have measured the distance that the sound additionally requires, the cause can be determined as follows: Stretch a string from the tweeter of the loudspeaker to the listening position, lengthen the string by the specified distance and determine which areas can be touched with the string: The Blue line is the path of direct sound from the speaker to the measuring microphone. The red line is the longer path of the diffuse sound. Instead of a cord, using a laser range finder is helpful. This way, even reflection points from the ceiling of the listening room can be measured easily.</font>
+=====  Footnote 1  =====
+<font 12pt/inherit;;inherit;;inherit>Undisturbed direct sound is considered to be -20 dB down from the peak impulse. You can see this in Acourate by choosing the ETC curve display at the bottom of the time window. Now hover the mouse over a reflected impulse that is within the first 20 ms after the main impulse. Observe at the top left of the window the dB value of the reflection compared to the main impulse.</font>
+{{:en:wiki:anhang:anleitungen:clipboard_image.jpg?nolink&400x671  |Early_Reflection_ETC}}