"""Signal processing functions.
Provides signal processing routines backed by the SciRS2 Rust implementation.
The API mirrors ``scipy.signal`` for easy migration.
Functions
---------
convolve : Convolve two N-dimensional arrays
correlate : Cross-correlate two N-dimensional arrays
fftconvolve : Convolve two arrays using the FFT method
butter : Butterworth digital filter design
cheby1 : Chebyshev type I digital filter design
sosfilt : Filter data along one dimension using second-order sections
filtfilt : Zero-phase digital filter
stft : Short-time Fourier transform
istft : Inverse short-time Fourier transform
spectrogram : Compute a spectrogram with consecutive Fourier transforms
welch : Power spectral density by Welch's method
find_peaks : Find peaks in a 1D array
"""
=