http://www.k-wave.org/forum/topic/shockwave-signal-simulation Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 18:27:53 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/shockwave-signal-simulation#post-6366 Thu, 22 Mar 2018 15:14:50 +0000 Charlie Garcia 6366@http://www.k-wave.org/forum/ <p>Thank you Brad,</p> <p>Charlie. </p> http://www.k-wave.org/forum/topic/shockwave-signal-simulation#post-6348 Sat, 17 Mar 2018 10:08:34 +0000 Bradley Treeby 6348@http://www.k-wave.org/forum/ <p>Hi Charlie,</p> <p>As you say, the sampling must meet Nyquist. However, for a shock wave (or any wave with a discontinuity in the first derivative), the bandwidth will be infinite. With moving mesh methods (e.g., see our <a href="http://bug.medphys.ucl.ac.uk/papers/2017-Wise-CCP.pdf">recent paper</a>) you can do a pretty good job simulating a shock front, but this is some way off making it's way into k-Wave.</p> <p>In the meantime, I would suggest increasing the sampling. For example, see the <a href="http://www.k-wave.org/documentation/example_na_modelling_nonlinearity.php">Modelling Nonlinear Wave Propagation Example</a> in the MATLAB help browser.</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/shockwave-signal-simulation#post-6346 Fri, 16 Mar 2018 15:29:24 +0000 Charlie Garcia 6346@http://www.k-wave.org/forum/ <p>Hi there,</p> <p>I'm having some problems to reproduce a shock-wave (an "N" wave) in a medium. In general I assign a vector containing the wave shape to a source (source.p) but after testing the received signal by a sensor, the shape has changed drastically . Also I tested a one cycle sinus as the input signal and the results are still not as spected. I find always a deformation close to the discontinuity. So my question would be: it's possible in kWave to propagate an specific signal shape, like an N wave or there's any limitation? (besides Nyquist and CFL)</p> <p>Thanks in advance! </p>