Reconfigurable processor for real-time adaptive sample rate notch filtering

Adaptive sample rate filtering has been shown to be effective in notch filter realization for removing narrowband push-to-talk interference. A prototype architecture is proposed for application to adaptive sample rate filtering which is capable of being reconfigured in real-time. This proposed architecture features field programmable gate array (FPGA) devices and ROM, and is to be demonstrated on audio signals using an XC4000 BORG prototyping board. A comparison is made between the computational complexity of the proposed architecture for adaptive sample rate filtering to that of traditional adaptive techniques which update filter coefficients. The results provide a measure of the advantages of the adaptive sample rate approach for notch filter applications