Cosine curve decomposition

In this section, we are going to actually use the TensorFlow.js API to run the FFT program. TensorFlow.js provides several derived implementations for FFT:

• tf.spectral.fft
• tf.spectral.ifft
• tf.spectral.rfft
• tf.spectral.irfft

TensorFlow.js also supports short-term Fourier transforms, which are a type of Fourier transformation that takes in a windowed sequence of the original samples:

• tf.singal.stft

By showing the output of these APIs with samples from cosine or sine waves, we will learn how this algorithm behaves.

Complex number type

Fourier transformation is fully generalized in the space of complex numbers. A complex number is a number that's expressed as a pair of real and imaginary numbers...