spectrum signal refresh

In general, the sine-cosine signal is sampled and the DfT is calculated, and the spectrum is shown to be not clean. This phenomenon is called spectral leakage. Because the DFT operation can only be a finite sequence, a sudden truncation creates a leak. There is a special case where the spectrogram is particularly clean when the sampling intercept is exactly the whole number of cycles. Can be understood as

Sine Cosine Signal DFT Spectrum Analysis (continued), cosine dft As mentioned in the previous article, the sequence length can be increased by adding zeros, so that the final increase of N can be used to increase the video resolution. However, it cannot solve the problem of frequency leakage. The root cause of frequency leakage is the selection of windows. Due to the abrupt truncation of the rectangular win

Label: MATLAB spectrum leakage DFT Window FunctionAs mentioned in the previous article, the sequence length can be increased by adding zeros, so that the final increase of N can be used to increase the video resolution. However, it cannot solve the problem of frequency leakage. The root cause of frequency leakage is the selection of windows.Due to the abrupt truncation of the rectangular window, the relatively large amplitude of the spectral Side Lobe

The UI Signal display on the android interface is implemented by sending AT commands to the communication module through RIL. For example, at + CSQ, we can obtain real-time RIL information through logcat-B radio. So how long does the signal display refresh on the interface? Frameworks/base/telephony/Java/COM/Android/Internal/telephony/servicestatetracker. Java /