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tf.signal.rfft

TensorFlow 1 version View source on GitHub

Real-valued fast Fourier transform.

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

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. Must be one of the following types: float32, float64. A float32 tensor.
  • fft_length: A Tensor of type int32. An int32 tensor of shape [1]. The FFT length.
  • Tcomplex: An optional tf.DType from: tf.complex64, tf.complex128. Defaults to tf.complex64.
  • name: A name for the operation (optional).

Returns:

A Tensor of type Tcomplex.

Compat aliases