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ThinkDSP

LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.

The premise of this book (and the other books in the Think X series) is that if you know how to program, you can use that skill to learn other things. I am writing this book because I think the conventional approach to digital signal processing is backward: most books (and the classes that use them) present the material bottom-up, starting with mathematical abstractions like phasors.

With a programming-based approach, I can go top-down, which means I can present the most important ideas right away. By the end of the first chapter, you can break down a sound into its harmonics, modify the harmonics, and generate new sounds.

Run the code for this book on Binder: Binder

This is a work in progress, so comments are welcome.

The book is under a Creative Commons license:

Attribution-NonCommercial-ShareAlike 3.0 Unported http://creativecommons.org/licenses/by-nc-sa/3.0/

The code is under the GNU GPL: GNU GPLv3 http://www.gnu.org/licenses/gpl.html

Freesound

Special thanks to Freesound (http://freesound.org), which is the source of many of the sound samples I use in this book, and to the Freesound users who uploaded those sounds. I include some of their wave files in the GitHub repository for this book, using the original file names, so it should be easy to find their sources.

Unfortunately, most Freesound users don't make their real names available, so I can only thank them using their user names. Samples used in this book were contributed by Freesound users: iluppai, wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad, bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!

Here are links to the sources:

http://www.freesound.org/people/iluppai/sounds/100475/

http://www.freesound.org/people/wcfl10/sounds/105977/

http://www.freesound.org/people/Thirsk/sounds/120994/

http://www.freesound.org/people/ciccarelli/sounds/132736/

http://www.freesound.org/people/Kleeb/sounds/180960/

http://www.freesound.org/people/zippi1/sounds/18871/

http://www.freesound.org/people/themusicalnomad/sounds/253887/

http://www.freesound.org/people/bcjordan/sounds/28042/

http://www.freesound.org/people/rockwehrmann/sounds/72475/

http://www.freesound.org/people/marcgascon7/sounds/87778/

http://www.freesound.org/people/jcveliz/sounds/92002/

About

Think DSP: Digital Signal Processing in Python, by Allen B. Downey.

greenteapress.com/wp/think-dsp/

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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ThinkDSP
LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
The premise of this book (and the other books in the Think X series) is that if you know how to program,
you can use that skill to learn other things. I am writing this book because I think the conventional
approach to digital signal processing is backward: most books (and the classes that use them) present
the material bottom-up, starting with mathematical abstractions like phasors.
With a programming-based approach, I can go top-down, which means I can present the most important
ideas right away. By the end of the first chapter, you can
break down a sound into its harmonics, modify the harmonics, and generate new sounds.
Run the code for this book on Binder: Binder
This is a work in progress, so comments are welcome.
The book is under a Creative Commons license:
Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
The code is under the GNU GPL:
GNU GPLv3 http://www.gnu.org/licenses/gpl.html
Freesound
Special thanks to Freesound (http://freesound.org), which is the source of many of the
sound samples I use in this book, and to the Freesound users who
uploaded those sounds. I include some of their wave files in
the GitHub repository for this book, using the original file
names, so it should be easy to find their sources.
Unfortunately, most Freesound users don't make their real names
available, so I can only thank them using their user names. Samples
used in this book were contributed by Freesound users: iluppai,
wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad,
bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!
Here are links to the sources:
http://www.freesound.org/people/iluppai/sounds/100475/
http://www.freesound.org/people/wcfl10/sounds/105977/
http://www.freesound.org/people/Thirsk/sounds/120994/
http://www.freesound.org/people/ciccarelli/sounds/132736/
http://www.freesound.org/people/Kleeb/sounds/180960/
http://www.freesound.org/people/zippi1/sounds/18871/
http://www.freesound.org/people/themusicalnomad/sounds/253887/
http://www.freesound.org/people/bcjordan/sounds/28042/
http://www.freesound.org/people/rockwehrmann/sounds/72475/
http://www.freesound.org/people/marcgascon7/sounds/87778/
http://www.freesound.org/people/jcveliz/sounds/92002/
About
Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
greenteapress.com/wp/think-dsp/
Resources
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ThinkDSP
LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
The premise of this book (and the other books in the Think X series) is that if you know how to program,
you can use that skill to learn other things. I am writing this book because I think the conventional
approach to digital signal processing is backward: most books (and the classes that use them) present
the material bottom-up, starting with mathematical abstractions like phasors.
With a programming-based approach, I can go top-down, which means I can present the most important
ideas right away. By the end of the first chapter, you can
break down a sound into its harmonics, modify the harmonics, and generate new sounds.
Run the code for this book on Binder: Binder
This is a work in progress, so comments are welcome.
The book is under a Creative Commons license:
Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
The code is under the GNU GPL:
GNU GPLv3 http://www.gnu.org/licenses/gpl.html
Freesound
Special thanks to Freesound (http://freesound.org), which is the source of many of the
sound samples I use in this book, and to the Freesound users who
uploaded those sounds. I include some of their wave files in
the GitHub repository for this book, using the original file
names, so it should be easy to find their sources.
Unfortunately, most Freesound users don't make their real names
available, so I can only thank them using their user names. Samples
used in this book were contributed by Freesound users: iluppai,
wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad,
bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!
Here are links to the sources:
http://www.freesound.org/people/iluppai/sounds/100475/
http://www.freesound.org/people/wcfl10/sounds/105977/
http://www.freesound.org/people/Thirsk/sounds/120994/
http://www.freesound.org/people/ciccarelli/sounds/132736/
http://www.freesound.org/people/Kleeb/sounds/180960/
http://www.freesound.org/people/zippi1/sounds/18871/
http://www.freesound.org/people/themusicalnomad/sounds/253887/
http://www.freesound.org/people/bcjordan/sounds/28042/
http://www.freesound.org/people/rockwehrmann/sounds/72475/
http://www.freesound.org/people/marcgascon7/sounds/87778/
http://www.freesound.org/people/jcveliz/sounds/92002/
About
Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
greenteapress.com/wp/think-dsp/
Resources
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ThinkDSP
LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
The premise of this book (and the other books in the Think X series) is that if you know how to program,
you can use that skill to learn other things. I am writing this book because I think the conventional
approach to digital signal processing is backward: most books (and the classes that use them) present
the material bottom-up, starting with mathematical abstractions like phasors.
With a programming-based approach, I can go top-down, which means I can present the most important
ideas right away. By the end of the first chapter, you can
break down a sound into its harmonics, modify the harmonics, and generate new sounds.
Run the code for this book on Binder: Binder
This is a work in progress, so comments are welcome.
The book is under a Creative Commons license:
Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
The code is under the GNU GPL:
GNU GPLv3 http://www.gnu.org/licenses/gpl.html
Freesound
Special thanks to Freesound (http://freesound.org), which is the source of many of the
sound samples I use in this book, and to the Freesound users who
uploaded those sounds. I include some of their wave files in
the GitHub repository for this book, using the original file
names, so it should be easy to find their sources.
Unfortunately, most Freesound users don't make their real names
available, so I can only thank them using their user names. Samples
used in this book were contributed by Freesound users: iluppai,
wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad,
bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!
Here are links to the sources:
http://www.freesound.org/people/iluppai/sounds/100475/
http://www.freesound.org/people/wcfl10/sounds/105977/
http://www.freesound.org/people/Thirsk/sounds/120994/
http://www.freesound.org/people/ciccarelli/sounds/132736/
http://www.freesound.org/people/Kleeb/sounds/180960/
http://www.freesound.org/people/zippi1/sounds/18871/
http://www.freesound.org/people/themusicalnomad/sounds/253887/
http://www.freesound.org/people/bcjordan/sounds/28042/
http://www.freesound.org/people/rockwehrmann/sounds/72475/
http://www.freesound.org/people/marcgascon7/sounds/87778/
http://www.freesound.org/people/jcveliz/sounds/92002/
About
Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
greenteapress.com/wp/think-dsp/
Resources
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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ThinkDSP
LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
The premise of this book (and the other books in the Think X series) is that if you know how to program,
you can use that skill to learn other things. I am writing this book because I think the conventional
approach to digital signal processing is backward: most books (and the classes that use them) present
the material bottom-up, starting with mathematical abstractions like phasors.
With a programming-based approach, I can go top-down, which means I can present the most important
ideas right away. By the end of the first chapter, you can
break down a sound into its harmonics, modify the harmonics, and generate new sounds.
Run the code for this book on Binder: Binder
This is a work in progress, so comments are welcome.
The book is under a Creative Commons license:
Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
The code is under the GNU GPL:
GNU GPLv3 http://www.gnu.org/licenses/gpl.html
Freesound
Special thanks to Freesound (http://freesound.org), which is the source of many of the
sound samples I use in this book, and to the Freesound users who
uploaded those sounds. I include some of their wave files in
the GitHub repository for this book, using the original file
names, so it should be easy to find their sources.
Unfortunately, most Freesound users don't make their real names
available, so I can only thank them using their user names. Samples
used in this book were contributed by Freesound users: iluppai,
wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad,
bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!
Here are links to the sources:
http://www.freesound.org/people/iluppai/sounds/100475/
http://www.freesound.org/people/wcfl10/sounds/105977/
http://www.freesound.org/people/Thirsk/sounds/120994/
http://www.freesound.org/people/ciccarelli/sounds/132736/
http://www.freesound.org/people/Kleeb/sounds/180960/
http://www.freesound.org/people/zippi1/sounds/18871/
http://www.freesound.org/people/themusicalnomad/sounds/253887/
http://www.freesound.org/people/bcjordan/sounds/28042/
http://www.freesound.org/people/rockwehrmann/sounds/72475/
http://www.freesound.org/people/marcgascon7/sounds/87778/
http://www.freesound.org/people/jcveliz/sounds/92002/
About
Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
greenteapress.com/wp/think-dsp/
Resources
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ThinkDSP
LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
The premise of this book (and the other books in the Think X series) is that if you know how to program,
you can use that skill to learn other things. I am writing this book because I think the conventional
approach to digital signal processing is backward: most books (and the classes that use them) present
the material bottom-up, starting with mathematical abstractions like phasors.
With a programming-based approach, I can go top-down, which means I can present the most important
ideas right away. By the end of the first chapter, you can
break down a sound into its harmonics, modify the harmonics, and generate new sounds.
Run the code for this book on Binder: Binder
This is a work in progress, so comments are welcome.
The book is under a Creative Commons license:
Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
The code is under the GNU GPL:
GNU GPLv3 http://www.gnu.org/licenses/gpl.html
Freesound
Special thanks to Freesound (http://freesound.org), which is the source of many of the
sound samples I use in this book, and to the Freesound users who
uploaded those sounds. I include some of their wave files in
the GitHub repository for this book, using the original file
names, so it should be easy to find their sources.
Unfortunately, most Freesound users don't make their real names
available, so I can only thank them using their user names. Samples
used in this book were contributed by Freesound users: iluppai,
wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad,
bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!
Here are links to the sources:
http://www.freesound.org/people/iluppai/sounds/100475/
http://www.freesound.org/people/wcfl10/sounds/105977/
http://www.freesound.org/people/Thirsk/sounds/120994/
http://www.freesound.org/people/ciccarelli/sounds/132736/
http://www.freesound.org/people/Kleeb/sounds/180960/
http://www.freesound.org/people/zippi1/sounds/18871/
http://www.freesound.org/people/themusicalnomad/sounds/253887/
http://www.freesound.org/people/bcjordan/sounds/28042/
http://www.freesound.org/people/rockwehrmann/sounds/72475/
http://www.freesound.org/people/marcgascon7/sounds/87778/
http://www.freesound.org/people/jcveliz/sounds/92002/
About
Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
greenteapress.com/wp/think-dsp/
Resources
Readme
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Stars
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ThinkDSP
LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
The premise of this book (and the other books in the Think X series) is that if you know how to program,
you can use that skill to learn other things. I am writing this book because I think the conventional
approach to digital signal processing is backward: most books (and the classes that use them) present
the material bottom-up, starting with mathematical abstractions like phasors.
With a programming-based approach, I can go top-down, which means I can present the most important
ideas right away. By the end of the first chapter, you can
break down a sound into its harmonics, modify the harmonics, and generate new sounds.
Run the code for this book on Binder: Binder
This is a work in progress, so comments are welcome.
The book is under a Creative Commons license:
Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
The code is under the GNU GPL:
GNU GPLv3 http://www.gnu.org/licenses/gpl.html
Freesound
Special thanks to Freesound (http://freesound.org), which is the source of many of the
sound samples I use in this book, and to the Freesound users who
uploaded those sounds. I include some of their wave files in
the GitHub repository for this book, using the original file
names, so it should be easy to find their sources.
Unfortunately, most Freesound users don't make their real names
available, so I can only thank them using their user names. Samples
used in this book were contributed by Freesound users: iluppai,
wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad,
bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!
Here are links to the sources:
http://www.freesound.org/people/iluppai/sounds/100475/
http://www.freesound.org/people/wcfl10/sounds/105977/
http://www.freesound.org/people/Thirsk/sounds/120994/
http://www.freesound.org/people/ciccarelli/sounds/132736/
http://www.freesound.org/people/Kleeb/sounds/180960/
http://www.freesound.org/people/zippi1/sounds/18871/
http://www.freesound.org/people/themusicalnomad/sounds/253887/
http://www.freesound.org/people/bcjordan/sounds/28042/
http://www.freesound.org/people/rockwehrmann/sounds/72475/
http://www.freesound.org/people/marcgascon7/sounds/87778/
http://www.freesound.org/people/jcveliz/sounds/92002/
About
Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
greenteapress.com/wp/think-dsp/
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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ThinkDSP
LaTeX source and Python code for Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
The premise of this book (and the other books in the Think X series) is that if you know how to program,
you can use that skill to learn other things. I am writing this book because I think the conventional
approach to digital signal processing is backward: most books (and the classes that use them) present
the material bottom-up, starting with mathematical abstractions like phasors.
With a programming-based approach, I can go top-down, which means I can present the most important
ideas right away. By the end of the first chapter, you can
break down a sound into its harmonics, modify the harmonics, and generate new sounds.
Run the code for this book on Binder: Binder
This is a work in progress, so comments are welcome.
The book is under a Creative Commons license:
Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
The code is under the GNU GPL:
GNU GPLv3 http://www.gnu.org/licenses/gpl.html
Freesound
Special thanks to Freesound (http://freesound.org), which is the source of many of the
sound samples I use in this book, and to the Freesound users who
uploaded those sounds. I include some of their wave files in
the GitHub repository for this book, using the original file
names, so it should be easy to find their sources.
Unfortunately, most Freesound users don't make their real names
available, so I can only thank them using their user names. Samples
used in this book were contributed by Freesound users: iluppai,
wcfl10, thirsk, docquesting, kleeb, landup, zippi1, themusicalnomad,
bcjordan, rockwehrmann, marchascon7, jcveliz. Thank you all!
Here are links to the sources:
http://www.freesound.org/people/iluppai/sounds/100475/
http://www.freesound.org/people/wcfl10/sounds/105977/
http://www.freesound.org/people/Thirsk/sounds/120994/
http://www.freesound.org/people/ciccarelli/sounds/132736/
http://www.freesound.org/people/Kleeb/sounds/180960/
http://www.freesound.org/people/zippi1/sounds/18871/
http://www.freesound.org/people/themusicalnomad/sounds/253887/
http://www.freesound.org/people/bcjordan/sounds/28042/
http://www.freesound.org/people/rockwehrmann/sounds/72475/
http://www.freesound.org/people/marcgascon7/sounds/87778/
http://www.freesound.org/people/jcveliz/sounds/92002/
About
Think DSP: Digital Signal Processing in Python, by Allen B. Downey.
greenteapress.com/wp/think-dsp/
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages