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HD Radio SDR Receiver

This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.

How to use this software

The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.

Why write this software

Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.

This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).

HDC sample audio

In the example subdirectory there is a dump of HDC data in text format.

About

HD Radio SDR Receiver

Topics

audio-packetscodecdigital-transmissionshdcibiquityradiosdr

Resources

Readme
GPL-3.0 license
Activity

Stars

22 stars

Watchers

1 watching

Forks

5 forks
Report repository

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - philburr/hdradio: HD Radio SDR Receiver · GitHub
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HD Radio SDR Receiver
This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.
How to use this software
The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.
Why write this software
Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.
This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).
HDC sample audio
In the example subdirectory there is a dump of HDC data in text format.
About
HD Radio SDR Receiver
Topics
audio-packetscodecdigital-transmissionshdcibiquityradiosdr
Resources
Readme
GPL-3.0 license
Activity
Stars
22 stars
Watchers
1 watching
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Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - philburr/hdradio: HD Radio SDR Receiver · GitHub
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Repository files navigation
HD Radio SDR Receiver
This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.
How to use this software
The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.
Why write this software
Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.
This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).
HDC sample audio
In the example subdirectory there is a dump of HDC data in text format.
About
HD Radio SDR Receiver
Topics
audio-packetscodecdigital-transmissionshdcibiquityradiosdr
Resources
Readme
GPL-3.0 license
Activity
Stars
22 stars
Watchers
1 watching
Forks
5 forks
Report repository
Releases
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - philburr/hdradio: HD Radio SDR Receiver · GitHub
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Repository files navigation
HD Radio SDR Receiver
This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.
How to use this software
The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.
Why write this software
Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.
This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).
HDC sample audio
In the example subdirectory there is a dump of HDC data in text format.
About
HD Radio SDR Receiver
Topics
audio-packetscodecdigital-transmissionshdcibiquityradiosdr
Resources
Readme
GPL-3.0 license
Activity
Stars
22 stars
Watchers
1 watching
Forks
5 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - philburr/hdradio: HD Radio SDR Receiver · GitHub
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Repository files navigation
HD Radio SDR Receiver
This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.
How to use this software
The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.
Why write this software
Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.
This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).
HDC sample audio
In the example subdirectory there is a dump of HDC data in text format.
About
HD Radio SDR Receiver
Topics
audio-packetscodecdigital-transmissionshdcibiquityradiosdr
Resources
Readme
GPL-3.0 license
Activity
Stars
22 stars
Watchers
1 watching
Forks
5 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - philburr/hdradio: HD Radio SDR Receiver · GitHub
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Repository files navigation
HD Radio SDR Receiver
This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.
How to use this software
The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.
Why write this software
Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.
This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).
HDC sample audio
In the example subdirectory there is a dump of HDC data in text format.
About
HD Radio SDR Receiver
Topics
audio-packetscodecdigital-transmissionshdcibiquityradiosdr
Resources
Readme
GPL-3.0 license
Activity
Stars
22 stars
Watchers
1 watching
Forks
5 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
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var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - philburr/hdradio: HD Radio SDR Receiver · GitHub
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Repository files navigation
HD Radio SDR Receiver
This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.
How to use this software
The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.
Why write this software
Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.
This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).
HDC sample audio
In the example subdirectory there is a dump of HDC data in text format.
About
HD Radio SDR Receiver
Topics
audio-packetscodecdigital-transmissionshdcibiquityradiosdr
Resources
Readme
GPL-3.0 license
Activity
Stars
22 stars
Watchers
1 watching
Forks
5 forks
Report repository
Releases
Packages
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
GitHub - philburr/hdradio: HD Radio SDR Receiver · GitHub
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Repository files navigation
HD Radio SDR Receiver
This project is a partial implemention of the NSRC-5 HD Radio Air Interface for FM IBOC digital transmissions. The specification does not (sadly) include a description of the iBiquity HDC codec. As a result, it is not possible at this time to listen to IBOC digital transmissions.
How to use this software
The executable expects a single parameter to a file which contains the IQ data captured with the FM station tuned in sampled at a sampling rate of 744187.5 samples per second. The software only support service mode MP1 (all of the FM stations transmitting IBOC near me were using this mode). It will dump out to the console the audio packets of the first (primary) logical channel. There will be one line per audio packet with the data dumped in hex format. If there is an asterisk (*) at the end of the line, it failed the CRC checksum.
Why write this software
Admittedly this software has little practical use. For me it was a tool for learning about digital transmissions, OFDM, convolutional coding, viterbi decoding, etc.
This software may be of interest to anyone interested in the iBiquity HDC codec. If you figure out how to decode HDC audio, let me know and I'll be happy to make the software more robust (additional modes, more efficient decoding, soft viterbi decoding, etc).
HDC sample audio
In the example subdirectory there is a dump of HDC data in text format.
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HD Radio SDR Receiver
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audio-packetscodecdigital-transmissionshdcibiquityradiosdr
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GPL-3.0 license
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