A simplified prediction model for the early-to-late energy ratio has been tested for small rooms that are typically used in video conferences. The prediction model is a modified diffuse-field model, using Barron’s revised formula for a distance-dependent reverberation level, together with Vorländer’s revised formula for a constant reverberation level. Measurements have been carried out in a few rooms and early- and total-energy levels have been compared with predictions according to the simplified model and predicted octave-band levels are typically within 1 dB of measured values, for the frequency range of 250 Hz to 2 kHz. Measured impulse responses were then convolved to simulate a video conference setup and simplified predictions of the early-to-late energy ratios, C50, for convolved impulse responses gave prediction errors that were on average around 1.5 dB as compared with (convolved) measurements.
Authors:
el-Banna Zidan, Hassan; Svensson, U. Peter
Affiliation:
Norwegian University of Science and Telecommunications, Trondheim, Norway
AES Convention:
129 (November 2010)
Paper Number:
8223
Publication Date:
November 4, 2010
Subject:
Virtual Rooms
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