Technical Paper
Is This Room Anechoic? A New Anechoic Room Qualification Standard May Be Needed for Impulsive Sound Quality Tests
2007-05-15
2007-01-2217
This paper discusses a project that was begun shortly before an unexpected retirement opportunity appeared that limits the possibilities for follow-up work. Some simple measurements of impulsive sounds were made in an anechoic room to investigate concerns that room alterations for sound transmission loss testing had introduced what appeared to be some reflecting surfaces in the room. The impulsive sound tests confirmed that the alterations had indeed introduced reflections into the room. Ways to reduce those reflections were developed and confirmed. However, the test results also raise concerns about reflections from the perforated metal wedges used in the original room design. An important first question is how do these reflections affect the results of sound quality work performed in this type of room?