Improved AuditoryInspired Signal Processing Algorithm Design for Tracking Multiple Frequency Components An adaptive synchrony capture filterbank (SCFB) signal processing architecture for tracking signal frequency components was proposed in a previous paper. Detailed analysis and further improvements are presented here. The original SCFB signal processing architecture consisted of a fixed array of traditional, passive linear, gammatone filters in cascade with a bank of three adaptively tunable bandpass filters that form part of a frequency discriminator loop (FDL). The SCFB exhibits many desirable properties for processing speech, music, and other complex sounds. In this article, an improved SCFB architecture is presented along with detailed specification of parameters that yield better frequency tracking. This architecture combines a FDL with a phaselocked loop, a concept borrowed from communication systems, to acquire and track frequency components in a timevarying signal. This modified algorithm estimates frequencies with higher accuracy even in the presence of closely spaced tones in the input. The improved performance of the algorithm is demonstrated by comparing the mean square error in the frequency estimates of synthetic timevarying signals.

UltraLowPower Intelligent Acoustic Sensing using CochleaInspired Feature Extraction and DNN Classification We present our recent progress in ultralowpower intelligent acoustic sensing that harnesses the high power and energy efficiency of cochlealike analog feature extraction and binarized neural network classification. Compared with conventional methods including the fast Fourier transformbased feature extraction plus neural network classification, and the more aggressive approach based on endtoend neural network models, the analog filter bankbased handcrafted feature extraction inspired by mammalian cochlea has the promise of achieving the minimum power consumption for many existing and emerging alwayson audio applications. System considerations and circuit techniques that are used to achieve the high power efficiency will be presented and comparison with some stateoftheart works, and future directions will be discussed.