`functional_phase_vocoder.Rd`

Given a STFT tensor, speed up in time without modifying pitch by a factor of `rate`

.

`functional_phase_vocoder(complex_specgrams, rate, phase_advance)`

- complex_specgrams
(Tensor): Dimension of

`(..., freq, time, complex=2)`

- rate
(float): Speed-up factor

- phase_advance
(Tensor): Expected phase advance in each bin. Dimension of (freq, 1)

`tensor`

: Complex Specgrams Stretch with dimension of `(..., freq, ceiling(time/rate), complex=2)`

```
if(torch::torch_is_installed()) {
library(torch)
library(torchaudio)
freq = 1025
hop_length = 512
# (channel, freq, time, complex=2)
complex_specgrams = torch_randn(2, freq, 300, 2)
rate = 1.3 # Speed up by 30%
phase_advance = torch_linspace(0, pi * hop_length, freq)[.., NULL]
x = functional_phase_vocoder(complex_specgrams, rate, phase_advance)
x$shape # with 231 == ceil (300 / 1.3)
# torch.Size ([2, 1025, 231, 2])
}
#> [1] 2 1025 231 2
```