专利汇可以提供Log spectrum decoding utilizing symmetry专利检索,专利查询,专利分析的服务。并且A log spectrum decoder for performing the Discrete Fourier Transform (DFT) of a set of samples of an input signal employs first and second counter devices, the output value of the first counter device being related to the number of samples of the input signal and the output value of the second counter device determining the number of samples in an output signal. A multiplier circuit multiplies each of the input samples by a plurality of voltage signals collectively representing a cosine function. The number of voltage signals are related to the number of output signals of the second counting device. The resultant product signals are directed simultaneously to a first predetermined storage location in a memory device and through a function generator to a second predetermined storage location in the memory device. The product of each odd-numbered input sample and the sampled cosine function signals is inverted in the function generator and stored in the second predetermined storage location so as to form a series of signals having odd symmetry about the last output signal of the second counting device. Similarly, the product of each even-numbered input sample and the sampled cosine function is directed through the function generator without inversion to form a series of signals having even function symmetry about the last output signal of the second counting means. The series of signals stored in the memory device are directed to an accumulator circuit which adds, on a corresponding storage location basis, the most recent calculated series of signals to the accumulated sum of the previous signals. When the last input sample has been processed, the accumulated series of signals represents the logarithm of spectrum magnitudes of the input signal.,下面是Log spectrum decoding utilizing symmetry专利的具体信息内容。
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