Look at Speech!

Distribution release

Look at Speech!Look at Speech! 1.0.0

A self-contained client-side browser application for inspecting and illustrating WAV recordings as synchronized waveforms, spectrograms, AM envelopes and F0 tracks. Processing and data stay on the local computer.

Download ZIP Explore features

Version 1.0.0 · MIT licensed · No account or server required. Authored, designed and specified, based on earlier RFA implementations, by D. Gibbon. Code suggestions by ChatGP5. 2026-07-10

Overview

Speech analysis in one local workspace

Load a WAV file, inspect synchronized time- and frequency-domain views, select intervals, zoom, play audio and tune the analysis exclusively in your own local environment. Nothing is uploaded, no information is collected.

W

Waveform and AM envelope

Pixel-aware waveform rendering with an optional, smoothed AM-envelope overlay.

S

Configurable spectrogram

Five window presets, selectable frequency range, pre-emphasis and three colour map options.

F0

Enhanced AMDF F0 estimation

Worker-based F0 estimation with Low, High and Custom range macros plus detailed controls.

↔

Synchronized interaction

Selection, zoom, absolute-time axes and playback cursor stay aligned across displays.

▶

Context-sensitive playback

Play the current selection when present, otherwise the complete visible interval.

T

Eight interface themes

Whisky, Polar, Ocean, Forest, Burgundy, Aubergine, Elegance and High Contrast.

Audio and processing

  • Local WAV decoding and multichannel averaging to mono
  • DC removal, high-pass and low-pass filtering
  • Selectable 8–16 kHz downsampling rate
  • Optional peak normalization
  • Recordings over 90 seconds accepted with a performance warning

Display and analysis

  • Spectrogram, F0 and combined lower-panel modes
  • Independent spectrogram and F0 frequency scales
  • Cached rendering when changing zoom or panel mode
  • Graph-click and button playback use the same interval rules
  • User settings retained when comparing successive files

Package contents

Source, distribution and tools

The ZIP contains a single-file version for direct use in a modern browser.

Ready-to-use ZIP-packaged distribution

  • lookatspeech-1.0.0.zip
  • One self-contained HTML file
  • Embedded module worker
  • No installation or build step required

Developer package (not yet available)

  • app/ modular HTML, CSS and JavaScript
  • Tools/ build, version, F0-test and packaging scripts
  • README, implementation notes and changelog
  • MIT license

Getting started

Open and analyse

The distribution version is designed to run directly from the downloaded package.

Download and extract

Download the ZIP and extract the lookatspeech-1.0.0.htmlapp file.

Open the app

Open lookatspeech-1.0.0.html in a current desktop browser.

Load a WAV file

Select a recording and explore its waveform, spectrogram, envelope and estimated F0.

Download Look at Speech! 1.0.0

The app is ZIP-packaged for protection from immediate online operation, as it is intended only for local use.

Look at Speech!