離散時間フーリエ変換（DFT）やFFT処理ってさ、時間のデータが「そのまま」周波数のデータになるわけじゃないんだ。いろんな前後処理が必要なんだ。 でもさ、たまにしか使わないからいつも「あれ？どんな処理するんだっけ？」って忘れちゃうんだよね。

信号処理では「FFT」と言う技術が色々なところで使われています。プログラム言語ではライブラリーとしてFFTが準備されていますし、エクセルですらFFTがサポートされています。 FFTを使ってみようとFFT入門書などを探してみても、FFTの基本原理や基本的な ...

The output signal of the actual voltage across the tube of a high-frequency generator was measured using the built-in voltage sense taps that are used for voltage regulation feedback in X-ray ...

Annotated Spectrogram and FFT plotter with frequency bin analysis. Source code from gmarlton from met office, many thanks for your help with this Graham! start_time = "2022-01-11T12:40:00"# Edit this ...

Abstract: The complete Fast Fourier Transform (FFT) technique for the computation of the spectrum amplitude of step-like waveforms is presented in this paper. The complete FFT technique offers an ...

Modern pulsed radar systems use advanced waveform and modulation characteristics to obtain greater range resolution, enhanced clutter suppression and superior target recognition. Specifically, ...

Abstract: Fast Fourier transform (FFT)-domain signal processing has been considered recently as an effective tool for spectrum enhancement of orthogonal frequency-division multiplexing (OFDM)-based ...

Add noise to a simple signal given by a sum of two sine waves. Plot the spectrograms for the clean and noisy signals to campare. Compute FFT and plot the power spectral density(PSD) of the noisy ...