[spectrogram-basic] Spectrogram Time-Frequency Heatmap

[MarkusNeusinger]

A spectrogram displaying time-frequency representation of a signal as a heatmap. Shows how frequency content changes over time, with color intensity representing amplitude/power. Used for audio, speech, and vibration analysis.

[claude]

✅ Spec ID: spectrogram-basic

Rationale: A spectrogram is a specialized visualization showing time-frequency representation of signals. This is distinct from generic heatmaps as it's specifically designed for signal processing and audio analysis applications.

Add label approved to begin generation.

[github-actions]

✅ Specification Ready: spectrogram-basic

PR: #2931

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specification.md

spectrogram-basic: Spectrogram Time-Frequency Heatmap

Description

A spectrogram displaying time-frequency representation of a signal as a heatmap. It shows how the frequency content of a signal changes over time, with color intensity representing the amplitude or power at each time-frequency point. Essential for analyzing non-stationary signals where frequency characteristics vary, revealing patterns invisible in time-domain or frequency-domain views alone.

Applications

• Audio analysis including speech recognition and music processing
• Vibration monitoring for machinery health and fault detection
• Seismic data analysis for earthquake and geological studies
• Biomedical signal processing such as EEG and ECG analysis

Data

• signal (numeric array) - time-domain signal values
• sample_rate (numeric) - sampling frequency in Hz
• Size: 1000-50000 samples for clear visualization
• Example: chirp signal with increasing frequency, audio waveform, or vibration data

Notes

• Use a perceptually uniform colormap (viridis, inferno) for accurate magnitude representation
• Include colorbar with power/amplitude units (dB scale often preferred)
• Label axes clearly: time (seconds) on x-axis, frequency (Hz) on y-axis
• Consider log scale for frequency axis when spanning multiple octaves
• Window size and overlap affect time-frequency resolution trade-off

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Next: Add approved label to merge this specification to main.

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[github-actions]

🚀 Specification Merged!

Specification: spectrogram-basic
PR: #2931 (merged)

The specification is now in main and synced to PostgreSQL.

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Available libraries: matplotlib, seaborn, plotly, bokeh, altair, plotnine, pygal, highcharts, letsplot

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🤖 spec-create workflow