Onset Detection and Tempo Estimation in Indian Instrumental Music.
Rhythm is an important feature in any music, and changes in rhythm can be easily perceived by a listener. Hindustani instrumental music concerts, such as those of sitar and sarod, have an interesting concert structure, where different sections have different rhythm. The changes in rhythm can be due to either the main instrumentalist, or due to the tabla player. In this talk, I will briefly describe the concert structure, and then present our work on describing the structure through computational and signal processing methods. Identifying the rhythm involves identifying the short term periodicity in the pattern of string plucks /onsets as well as the pattern of tabla strokes. In our work, we come up with a new method to detect tabla onsets alone. In addition, we use a standard approach for onset detection to detect both tabla and sarod/sitar onsets. Using these two methods, we are able to come up with a visual representation of rhythm pattern across the concert.
Saurabh Pinjani and Ashwin Lele
Perovskite Solar Cells : Effect Of Interface Charge on Efficiency.
Solar Cell Technology can change the energy situation across the globe providing clean renewable energy. Various novel materials and device architectures have been suggested as replacement for traditional silicon solar modules. However perovskite based solar have displayed unprecedented improvement in performance in just 3-4 years of active research. However issues like hysteresis and low durability present challenges in large scale deployment. The talk will also showcase our efforts in understanding the cause of hysteresis and unravelling the device physics behind degradation in performance.