Abstract: An optimization method for an implementation of mel-frequency cepstral coefficients is provided. The optimization method includes the following steps: performing a framing step, including using a 400×16 static random access memory to temporarily store a plurality of sampling points of a sound signal with overlap, and decomposing the sound signal into a plurality of frames. Each of the plurality of frames is 400 of the sampling points, there is an overlapping region between adjacent two of the plurality of frames, and the overlapping region includes 240 of the sampling points. The optimization method further includes performing a windowing step, which includes multiplying each of the plurality of frames by a window function in a bit-level design, and the optimization method includes performing a fast Fourier transform (FFT) step, which includes applying a 512 point FFT on a frame signal to obtain a corresponding frequency spectrum.

Abstract: An optimization method for an implementation of mel-frequency cepstral coefficients is provided. The optimization method includes the following steps: performing a framing step, including using a 400×16 static random access memory to temporarily store a plurality of sampling points of a sound signal with overlap, and decomposing the sound signal into a plurality of frames. Each of the plurality of frames is 400 of the sampling points, there is an overlapping region between adjacent two of the plurality of frames, and the overlapping region includes 240 of the sampling points. The optimization method further includes performing a windowing step, which includes multiplying each of the plurality of frames by a window function in a bit-level design, and the optimization method includes performing a fast Fourier transform (FFT) step, which includes applying a 512 point FFT on a frame signal to obtain a corresponding frequency spectrum.

Abstract: This invention relates to a windproof cigarette lighter with double flames, producing not only windproof type, but also a visible flame. It comprises: a housing, a gas reservoir, a gas charging valve, a gas discharging valve with discharging amount adjustable and valve opening member. A nozzle of the gas discharging valve is connected to the inlet of a burner through a first conduit. A piezoelectric igniting device is activated upon the opening of the gas discharging valve. The burner consists of a jet pump, a combustion chamber and a flame stabilizer which is composed of a central hub and at least a channel between the central hub and the wall of the combustion chamber. An igniting element is arranged on the downstream portion of the combustion chamber. A second conduit is connected to a nozzle which is located on the top center of the central hub and has its opening vertically upward.