Spectrogram

Spectrogram

Module	limewire/pages/spectrogram.py
Class	SpectrogramPage(ScrollFrame)

Overview

Frequency visualization page that generates linear, mel-scale, and constant-Q (CQT) spectrograms from audio files. Supports multiple colormaps, configurable FFT sizes, hover-to-inspect frequency/time readout, and image export.

Features

• Spectrogram types: Linear (STFT), Mel, CQT
• FFT size options: 512, 1024, 2048, 4096
• Colormaps: viridis, magma, plasma, inferno
• Interactive canvas with mouse hover showing time and frequency at cursor
• Rendered via librosa + PIL, displayed on tkinter Canvas
• Save spectrogram as PNG image
• Per-page settings: default sample rate, dB floor, dB ceiling

Key Methods

Method	Description
_generate()	Compute and render spectrogram in a background thread
_on_hover(event)	Display time/frequency readout at mouse position
_save_image()	Export spectrogram canvas to PNG file
_browse()	Open file dialog for audio file selection