Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Spectrogram Interaction Component

This component provides an interactive overlay for sonar spectrogram images, enabling users to place harmonic cursors, adjust scaling via a rate input, and switch between multiple analysis modes.

Key Features

Modes: Pan (default), Analysis, Harmonics, Sidebands, Doppler
Harmonic line overlays with frequency labels
Retro-style LED readouts for measurement
Drag-to-place cursor system with unlimited cursors
Embedded via HTML config tables
Fully self-contained JavaScript (no build step)
Developer diagnostics mode available via standalone page

Developer Documentation

Getting Started — Prerequisites, setup, and development workflow
Technical Architecture — System architecture, mode system, rendering pipeline, state management
HTML Integration Guide — Embedding GramFrame in HTML pages
Adding Graphical Features — Code area guide for new visual features
Data and State Guide — State management patterns and data flow
Rendering Troubleshooting — Debugging rendering and coordinate issues
Architecture Decision Records — Design decisions and rationale

Annotation Persistence

Annotations (analysis markers, harmonic sets, sideband sets, and Doppler curves) are saved to browser storage automatically. The storage backend depends on whether the page is detected as a trainer or student context:

Context	Storage	Lifetime
Trainer	`localStorage`	Permanent — survives browser restarts
Student	`sessionStorage`	Cleared when the browser tab/session closes

How the context is detected

A page is treated as a trainer page if either of the following is true:

The page contains an element with id="gf-persistent" (anywhere in the DOM), or
The page contains an anchor (<a>) element whose exact trimmed text is ANALYSIS.

If neither is present, the page is treated as a student page.

To opt a page into permanent (trainer) persistence, add a marker element, e.g.:

<spanid="gf-persistent" hidden></span>

The detection is re-evaluated on every save/load, and the storage key is namespaced per page path (gramframe::<pathname>) — only the storage backend (local vs. session) differs between contexts.

Target Audience

Trainees or students using sonar training manuals in HTML format.

Usage

Include the JavaScript file via <script>, and place a config table with the appropriate class on your HTML page. The component will auto-initialize after page load.

Checking the version

To identify which version of GramFrame an instance is running — useful when reporting or debugging an issue:

In the UI: hover over the Pan button. A tooltip shows GramFrame vX.Y.Z. (The tooltip is available even before zooming in, while the button is disabled.)

Programmatically: read state.version via the public API:

GramFrame.addStateListener(state=>console.log(state.version))

Released builds show the real version (e.g. v0.1.12); local development builds show vDEV until yarn generate-version runs.

Name		Name	Last commit message	Last commit date
.claude		.claude
.github/workflows		.github/workflows
.husky		.husky
.specify		.specify
docs		docs
sample		sample
scripts		scripts
specs		specs
src		src
tests		tests
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
debug-multiple.html		debug-multiple.html
debug-trainer.html		debug-trainer.html
debug.html		debug.html
eslint.config.js		eslint.config.js
hygiene-baseline.json		hygiene-baseline.json
index.html		index.html
package.json		package.json
playwright.config.ts		playwright.config.ts
playwright.smoke.config.ts		playwright.smoke.config.ts
preview-student.html		preview-student.html
preview-trainer.html		preview-trainer.html
test-release.html		test-release.html
tsconfig.json		tsconfig.json
vite.config.js		vite.config.js
vitest.config.js		vitest.config.js
yarn.lock		yarn.lock

Name		Name	Last commit message	Last commit date
.claude		.claude
.github/workflows		.github/workflows
.husky		.husky
.specify		.specify
docs		docs
sample		sample
scripts		scripts
specs		specs
src		src
tests		tests
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
debug-multiple.html		debug-multiple.html
debug-trainer.html		debug-trainer.html
debug.html		debug.html
eslint.config.js		eslint.config.js
hygiene-baseline.json		hygiene-baseline.json
index.html		index.html
package.json		package.json
playwright.config.ts		playwright.config.ts
playwright.smoke.config.ts		playwright.smoke.config.ts
preview-student.html		preview-student.html
preview-trainer.html		preview-trainer.html
test-release.html		test-release.html
tsconfig.json		tsconfig.json
vite.config.js		vite.config.js
vitest.config.js		vitest.config.js
yarn.lock		yarn.lock

Name		Name	Last commit message	Last commit date
.claude		.claude
.github/workflows		.github/workflows
.husky		.husky
.specify		.specify
docs		docs
sample		sample
scripts		scripts
specs		specs
src		src
tests		tests
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
debug-multiple.html		debug-multiple.html
debug-trainer.html		debug-trainer.html
debug.html		debug.html
eslint.config.js		eslint.config.js
hygiene-baseline.json		hygiene-baseline.json
index.html		index.html
package.json		package.json
playwright.config.ts		playwright.config.ts
playwright.smoke.config.ts		playwright.smoke.config.ts
preview-student.html		preview-student.html
preview-trainer.html		preview-trainer.html
test-release.html		test-release.html
tsconfig.json		tsconfig.json
vite.config.js		vite.config.js
vitest.config.js		vitest.config.js
yarn.lock		yarn.lock

Name		Name	Last commit message	Last commit date
.claude		.claude
.github/workflows		.github/workflows
.husky		.husky
.specify		.specify
docs		docs
sample		sample
scripts		scripts
specs		specs
src		src
tests		tests
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
debug-multiple.html		debug-multiple.html
debug-trainer.html		debug-trainer.html
debug.html		debug.html
eslint.config.js		eslint.config.js
hygiene-baseline.json		hygiene-baseline.json
index.html		index.html
package.json		package.json
playwright.config.ts		playwright.config.ts
playwright.smoke.config.ts		playwright.smoke.config.ts
preview-student.html		preview-student.html
preview-trainer.html		preview-trainer.html
test-release.html		test-release.html
tsconfig.json		tsconfig.json
vite.config.js		vite.config.js
vitest.config.js		vitest.config.js
yarn.lock		yarn.lock

Name		Name	Last commit message	Last commit date
.claude		.claude
.github/workflows		.github/workflows
.husky		.husky
.specify		.specify
docs		docs
sample		sample
scripts		scripts
specs		specs
src		src
tests		tests
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
debug-multiple.html		debug-multiple.html
debug-trainer.html		debug-trainer.html
debug.html		debug.html
eslint.config.js		eslint.config.js
hygiene-baseline.json		hygiene-baseline.json
index.html		index.html
package.json		package.json
playwright.config.ts		playwright.config.ts
playwright.smoke.config.ts		playwright.smoke.config.ts
preview-student.html		preview-student.html
preview-trainer.html		preview-trainer.html
test-release.html		test-release.html
tsconfig.json		tsconfig.json
vite.config.js		vite.config.js
vitest.config.js		vitest.config.js
yarn.lock		yarn.lock

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Spectrogram Interaction Component

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Annotation Persistence

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Spectrogram Interaction Component

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Annotation Persistence

How the context is detected

Target Audience

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Spectrogram Interaction Component

Key Features

Developer Documentation

Annotation Persistence

How the context is detected

Target Audience

Usage

Checking the version

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Watchers

Forks

Releases

Packages

Contributors

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Spectrogram Interaction Component

Key Features

Developer Documentation

Annotation Persistence

How the context is detected

Target Audience