Simultaneous measurement of time-invariant linear and nonlinear, and random and extra responses using frequency domain variant of velvet noise
This provides a general method for acoustic measurement that can be applied to fields like auditory-feedback research and sound recording assessment, though it appears incremental as it builds on existing TSP techniques.
The paper tackles the problem of simultaneously measuring linear, nonlinear, random, and time-varying acoustic responses by introducing a method using orthogonal sequences based on Frequency domain variant of Velvet Noise (FVN), which enables this without extra equipment, and they developed an open-source real-time tool for acoustic analysis.
We introduce a new acoustic measurement method that can measure the linear time-invariant response, the nonlinear time-invariant response, and random and time-varying responses simultaneously. The method uses a set of orthogonal sequences made from a set of unit FVNs (Frequency domain variant of Velvet Noise), a new member of the TSP (Time Stretched Pulse). FVN has a unique feature that other TSP members do not. It is a high degree of design freedom that makes the proposed method possible without introducing extra equipment. We introduce two useful cases using two and four orthogonal sequences and illustrates their use using simulations and acoustic measurement examples. We developed an interactive and realtime acoustic analysis tool based on the proposed method. We made it available in an open-source repository. The proposed response analysis method is general and applies to other fields, such as auditory-feedback research and assessment of sound recording and coding.