Sinusoidal signal four parameters testing method and virtual apparatus signal detection device
A signal detection and sinusoidal signal technology, applied in the field of digital signal processing and analysis, can solve the problems of measurement accuracy and clock frequency limitation, cannot meet the accuracy requirements of the industrial field, and does not have the ability to save waveform data and measurement result data, etc.
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[0110] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0111] The signal detection algorithm step that the present invention proposes is as follows:
[0112] Step 1: Continuously sample the signal to be tested to obtain a 2N-1 digital sequence L (numbered 0, 1, ..., 2N-2);
[0113] Step 2: Form the 0~N-1 points of L into a new sequence L1, and form the N-1~2N-2 points of L into a new sequence L2;
[0114] Step 3: Carry out fast Fourier transform (FFT) to sequence L1, L2 respectively, obtain the frequency spectrum of two sequences respectively;
[0115] Step 4: Extract the amplitude and phase angle information of the spectral peak of the two sequences of AC components in the spectrum, and obtain the preliminary measurement values of frequency and phase after preliminary processing to eliminate the spectrum leakage error;
[0116] Step 5: Measure the amplitude, frequency and phase (difference) of the high...
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