tf.signal.irfft

Inverse real-valued fast Fourier transform.

View aliases

Compat aliases for migration

tf.compat.v1.signal.irfft, tf.compat.v1.spectral.irfft, tf.compat.v2.signal.irfft

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

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

The inner-most dimension of input is assumed to be the result of RFFT: the fft_length / 2 + 1 unique components of the DFT of a real-valued signal. If fft_length is not provided, it is computed from the size of the inner-most dimension of input (fft_length = 2 * (inner - 1)). If the FFT length used to compute input is odd, it should be provided since it cannot be inferred properly.

Along the axis IRFFT is computed on, if fft_length / 2 + 1 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: complex64, complex128. A complex tensor.
fft_length: A Tensor of type int32. An int32 tensor of shape [1]. The FFT length.
Treal: An optional tf.DType from: tf.float32, tf.float64. Defaults to tf.float32.
name: A name for the operation (optional).

Returns:

A Tensor of type Treal.