Multi-Rate Signal Processing for Obtaining Higher-Order Derivatives of Low-Frequency Signals
In this paper, a multi-rate signal processing technique is pro posed for obtaining the higher-order derivatives of digital signals with an improved signal-to-quantization noise ratio (SQNR). Th e technique consists of an oversampling analog-todigital conversion (ADC) unit with a dithering process and a multi-stage down sampling process followed by a high performance digital differentiator with a down sampler using a factor of 2. In the cascaded multi-stage process, each stage contains a simple half-band low-pass filter with the same down sampler using a factor of 2. The proposed technique uses an extremely small finite impulse response (FIR) filter size; h ence, it req uires much less memory and computations in comparison to the single-stage process. Both computer simulations and experimental data processing demonstrate the effectiveness of the proposed method.
Oversampling FIR Digital Differentiator Higher-order Derivative Multi-rate Signal Processing
Li Tan Liangmo Wang Jean Jiang
College of Engineering and Technology, Purdue University North Central, Indiana 46391, USA School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Chin
国际会议
南京
英文
51-63
2012-08-16（万方平台首次上网日期，不代表论文的发表时间）