Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Automatic Noise Gate Settings for Drum Recordings Containing Bleed from Secondary Sources | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 465417 9 pages doi 2010 465417 Research Article Automatic Noise Gate Settings for Drum Recordings Containing Bleed from Secondary Sources Michael Terrell Joshua D. Reiss and Mark Sandler The Centre for Digital Music School of Electronic Engineering and Computer Science Queen Mary University of London London E14NS UK Correspondence should be addressed to Michael Terrell Received 1 March 2010 Revised 9 September 2010 Accepted 31 December 2010 Academic Editor Augusto Sarti Copyright 2010 Michael Terrell et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. An algorithm is presented which automatically sets the attack release threshold and hold parameters of a noise gate applied to drum recordings which contain bleed from secondary sources. The gain parameter which controls the amount of attenuation applied when the gate is closed is retained to allow the user to control the strength of the gate. The gate settings are found by minimising the artifacts introduced to the desirable component of the signal whilst ensuring that the level of bleed is reduced by a certain amount. The algorithm is tested on kick drum recordings which contain bleed from hi-hats snare drum cymbals and tom toms. 1. Introduction Dynamic audio effects apply a control gain to the input signal. The gain applied is a nonlinear function of the level of the input signal or a secondary signal . Dynamic effects are used to modify the amplitude envelope of a signal. They either compress or expand the dynamic range of a signal. A noise gate is an extreme expander. If the level of the signal entering the gate is below the gate threshold an attenuation is applied. If the level of the signal is above the .
