论文部分内容阅读
本文提出一种基于增量调制(DM)序列的离散傅里叶变换(DFT)结构,它不同于基于脉冲编码调制(PCM)的常规方法。提出这一想法是为了解决在常规的数字信号处理中的乘法运算问题,从而减小系统的复杂性,降低设备成本。我们将看到,本文提出的新的DFT结构取消了A/D变换器和乘法器,可望简化硬件设计、降低造价,而信噪比同样能够达到与常规的处理方法,如FFT相近的结果。计算机模拟表明,对于确定性信号,结果与常规的DFT相一致。对于带限高斯信号,只要适当地选择步长和过采样率系数,同样也能得到与常规DFT相近的结果。我们采用ROM存贮各个系数值,因此,整个运算完全是阅读和求和的过程,因而速度快,硬件结构简单,适用于语音、地震等信号的处理。本文最后给出了硬件实现方案和各个参数的选择方法,同时提供了计算机模拟结果。
This paper proposes a Discrete Fourier Transform (DFT) structure based on incremental modulation (DM) sequence, which is different from the conventional method based on pulse code modulation (PCM). This idea was proposed to solve the problem of multiplication in conventional digital signal processing, thereby reducing the complexity of the system and reducing the equipment cost. As we will see, the new DFT architecture proposed in this paper eliminates the need for A / D converters and multipliers and is expected to simplify hardware design and reduce cost, while SNR also achieves results similar to conventional approaches such as FFT . Computer simulations show that the results are consistent with the conventional DFT for deterministic signals. For band-limited Gaussian signals, similar results to conventional DFT are also obtained as long as the step size and over-sampling rate coefficients are properly chosen. We use ROM to store the value of each coefficient, therefore, the entire operation is completely reading and summation process, so fast, simple hardware structure, suitable for voice, earthquake and other signal processing. At the end of this paper, the hardware implementation scheme and the selection of each parameter are given, and the computer simulation results are provided.