# tf.spectral.rfft

tf.spectral.rfft(
input_tensor,
fft_length=None,
name=None
)


See the guide: Spectral Functions > Discrete Fourier Transforms

Real-valued fast Fourier transform.

Computes the 1-dimensional discrete Fourier transform of a real-valued signal over the inner-most dimension of input.

Since the DFT of a real signal is Hermitian-symmetric, RFFT only returns the fft_length / 2 + 1 unique components of the FFT: the zero-frequency term, followed by the fft_length / 2 positive-frequency terms.

Along the axis RFFT is computed on, if fft_length is smaller than the corresponding dimension of input, the dimension is cropped. If it is larger, the dimension is padded with zeros.

#### Args:

• input: A Tensor of type float32. A float32 tensor.
• fft_length: A Tensor of type int32. An int32 tensor of shape [1]. The FFT length.
• name: A name for the operation (optional).

#### Returns:

A Tensor of type complex64.