[{"data":1,"prerenderedAt":300},["ShallowReactive",2],{"blog-post-churchill-congress-1941-restored":3},{"slug":4,"path":5,"title":6,"description":7,"publishedAt":8,"updatedAt":8,"author":9,"category":10,"tags":11,"featureImage":14,"ogImage":20,"canonical":21,"seoTitle":22,"seoDescription":23,"keywords":24,"readingTimeMinutes":30,"wordCount":31,"bodySegments":32,"hasMath":152,"headings":153,"mediaClips":169,"showFeatureImage":152,"leadFigureHtml":173,"relatedPosts":189,"citations":299},"churchill-congress-1941-restored","/blog/churchill-congress-1941-restored/","Churchill's address to Congress, 1941: hear it restored","Winston Churchill in the Senate chamber on December 26, 1941, nineteen days after Pearl Harbor: three passages from the CBS broadcast, before and after restoration with Diffio AI.","2026-11-06T20:00:00Z","Nathan Harmon","restoration",[12,13],"Audio restoration","History",{"src":15,"alt":16,"widthPixels":17,"heightPixels":18,"srcset":19},"/media/blog/churchill-congress-1941-restored/churchill-spectrogram.webp","Spectrograms of Winston Churchill saying \"What kind of a people do they think we are?\" to Congress in 1941, original and restored with Diffio AI",1200,600,"/media/blog/churchill-congress-1941-restored/responsive/churchill-spectrogram-480w.webp 480w, /media/blog/churchill-congress-1941-restored/responsive/churchill-spectrogram-800w.webp 800w, /media/blog/churchill-congress-1941-restored/churchill-spectrogram.webp 1200w",{"src":15,"alt":16,"widthPixels":17,"heightPixels":18,"srcset":19},"https://diffio.ai/blog/churchill-congress-1941-restored/","Churchill's 1941 address to Congress, restored: hear it","Hear Winston Churchill address Congress on December 26, 1941: three passages from the CBS broadcast, original and restored, ahead of the 85th anniversary.",[25,26,27,28,29],"Churchill address to Congress 1941","Churchill speech to Congress recording","what kind of a people do they think we are","December 26 1941 broadcast","historical audio restoration",2,557,[33,113,116,137,139,150],{"kind":34,"comparison":35},"audio-comparison",{"passageName":36,"originalSourceNote":37,"originalSrc":38,"restoredSrc":39,"originalWaveformPeaks":40,"restoredWaveformPeaks":93},"Winston Churchill to Congress, December 26, 1941","CBS broadcast, National Archives","/media/blog/churchill-congress-1941-restored/churchill-people-original.mp3","/media/blog/churchill-congress-1941-restored/churchill-people-restored.mp3",[41,42,43,44,45,46,47,48,49,50,51,52,50,53,54,55,50,50,56,57,58,50,50,50,50,59,60,57,50,61,62,63,64,55,50,65,66,50,50,66,50,50,67,68,69,54,50,50,50,50,70,71,53,46,72,50,50,50,50,50,73,74,75,76,61,77,50,76,78,74,62,50,79,80,67,81,50,50,72,82,50,74,83,51,84,85,86,87,88,63,67,89,90,91,92,61],0.53,0.48,0.46,0.41,0.27,0.42,0.79,0.74,0.47,0.06,0.08,0.9,0.4,0.1,0.31,0.38,0.11,0.18,0.14,0.35,1,0.23,0.21,0.3,0.24,0.15,0.39,0.07,0.12,0.89,0.78,0.67,0.61,0.63,0.29,0.56,0.71,0.2,0.69,0.95,0.19,0.59,0.13,0.66,0.44,0.65,0.34,0.33,0.73,0.92,0.93,0.97,[50,50,50,50,50,84,61,94,95,50,78,61,50,76,88,96,50,68,82,97,45,51,50,50,50,66,98,76,99,61,60,55,53,98,50,100,88,83,50,49,51,50,101,64,102,103,50,50,50,50,104,76,105,56,77,50,50,50,50,50,106,106,75,46,61,74,50,107,102,82,62,50,43,108,109,97,50,50,110,111,68,98,78,112,85,56,110,102,109,50,50,50,50,50,50,50],0.88,0.76,0.52,0.22,0.5,0.26,0.49,0.68,0.36,0.16,0.86,0.37,0.51,0.58,0.81,0.28,0.54,0.45,0.09,{"kind":114,"html":115},"html","\u003Cp>Nineteen days after Pearl Harbor, Winston Churchill stood in the United States Senate chamber and addressed both houses of Congress. The National Archives holds the \u003Ca href=\"https://catalog.archives.gov/id/2194729\">Columbia Broadcasting System's recording\u003C/a>, which opens with an announcer explaining that the broadcast has replaced The Romance of Helen Trent. December 26, 2026 is the 85th anniversary. We ran three passages through Diffio AI; each original sits beside its result.\u003C/p>\n\u003Ch2 id=\"how-to-compare-the-original-and-restored-passages\">How to compare the original and restored passages\u003C/h2>\n\u003Cdiv class=\"blog-chart blog-chart--numbers\">\u003Cp class=\"blog-chart__title\">Before you listen\u003C/p>\u003Cul class=\"blog-numbers\">\u003Cli>\u003Cspan class=\"blog-numbers__value\">Matched\u003C/span>\u003Cspan class=\"blog-numbers__label\">each pair has the same loudness, so neither file wins by being louder\u003C/span>\u003C/li>\u003Cli>\u003Cspan class=\"blog-numbers__value\">Tone\u003C/span>\u003Cspan class=\"blog-numbers__label\">the restored voice is brighter than the original, so more than the noise changes\u003C/span>\u003C/li>\u003Cli>\u003Cspan class=\"blog-numbers__value\">Excerpts\u003C/span>\u003Cspan class=\"blog-numbers__label\">three passages, under four minutes in all\u003C/span>\u003C/li>\u003C/ul>\u003C/div>\n\u003Cdetails class=\"blog-details\">\u003Csummary>About our source\u003C/summary>\u003Cdiv class=\"blog-details__body\">\u003Cp>We worked from the MP3 files on the National Archives catalog (identifier 2194729), not the discs themselves, so what you hear in the original is the recording's age and the file's compression together. A speech quality model (SCOREQ) reads the three originals at 2.07 to 2.34 out of 5 and the restored files at 4.53 to 4.76. We compared transcripts of each original and restored file and rechecked the places they differed; we found no changed words.\u003C/p>\u003C/div>\u003C/details>\n\u003Ch2 id=\"what-kind-of-a-people-do-they-think-we-are\">"What kind of a people do they think we are?"\u003C/h2>\n\u003Cblockquote>\n\u003Cp>"What kind of a people do they think we are? Is it possible they do not realize that we shall never cease to persevere against them until they have been taught a lesson which they and the world will never forget?"\u003C/p>\n\u003C/blockquote>\n\u003Cfigure class=\"blog-figure blog-figure--image\">\u003Cdiv class=\"blog-figure__frame\">\u003Cimg src=\"/media/blog/churchill-congress-1941-restored/churchill-spectrogram.webp\" srcset=\"/media/blog/churchill-congress-1941-restored/responsive/churchill-spectrogram-480w.webp 480w, /media/blog/churchill-congress-1941-restored/responsive/churchill-spectrogram-800w.webp 800w, /media/blog/churchill-congress-1941-restored/churchill-spectrogram.webp 1200w\" sizes=\"(max-width: 760px) calc(100vw - 40px), 720px\" alt=\"Spectrograms of 18 seconds of Churchill's address, original above and restored below\" width=\"1200\" height=\"600\" loading=\"lazy\" decoding=\"async\">\u003C/div>\u003Cfigcaption>Restored, the noise between his words goes dark\u003C/figcaption>\u003Ca class=\"blog-figure__full\" href=\"/media/blog/churchill-congress-1941-restored/churchill-spectrogram.webp\">View full size\u003Cspan class=\"blog-visually-hidden\">: Spectrograms of 18 seconds of Churchill's address, original above and restored below\u003C/span>\u003C/a>\u003C/figure>\n\u003Cdetails class=\"blog-details\">\u003Csummary>How to read the spectrogram\u003C/summary>\u003Cdiv class=\"blog-details__body\">\u003Cp>Eighteen seconds of the address, from "What kind of a people" on, original above and restored below. Time runs left to right, pitch rises from bottom to top, and brighter means louder. In the original, noise fills the space between his words; after restoration that space goes dark.\u003C/p>\u003C/div>\u003C/details>\n\u003Ch2 id=\"i-might-have-got-here-on-my-own\">"I might have got here on my own"\u003C/h2>",{"kind":34,"comparison":117},{"passageName":118,"originalSourceNote":37,"originalSrc":119,"restoredSrc":120,"originalWaveformPeaks":121,"restoredWaveformPeaks":131},"Churchill's opening to Congress","/media/blog/churchill-congress-1941-restored/churchill-opening-original.mp3","/media/blog/churchill-congress-1941-restored/churchill-opening-restored.mp3",[50,50,59,50,54,51,112,59,122,69,50,123,50,110,75,50,42,51,50,122,50,66,50,50,50,50,51,85,112,60,50,62,124,50,125,124,50,66,50,54,50,126,68,112,50,97,81,60,50,103,58,103,50,68,50,127,126,50,58,50,50,112,50,49,50,128,45,50,124,86,50,129,44,130,52,61,61,61,52,77,97,60,88,63,55,69,85,125,50,105,57,122,83,99,109,55],0.32,0.75,0.25,0.57,0.17,0.55,0.83,0.62,0.77,[50,50,124,50,50,50,50,69,60,50,50,104,50,132,96,50,77,68,50,133,50,99,54,50,50,50,50,76,50,96,50,44,49,50,123,44,50,122,50,83,50,44,103,50,50,87,49,53,50,50,50,58,50,50,50,74,126,50,44,50,50,78,50,132,50,61,89,50,125,61,50,134,50,50,50,50,50,50,50,50,50,101,129,50,50,50,135,61,50,73,124,136,50,50,86,96],0.64,0.43,0.98,0.85,0.7,{"kind":114,"html":138},"\u003Cp>He opens with a joke about his American mother, which the National Archives quotes in its own description of the recording: "if my father had been American and my mother British, instead of the other way 'round, I might have got here on my own."\u003C/p>\n\u003Ch2 id=\"in-majesty-in-justice-and-in-peace\">"In majesty, in justice and in peace"\u003C/h2>",{"kind":34,"comparison":140},{"passageName":141,"originalSourceNote":37,"originalSrc":142,"restoredSrc":143,"originalWaveformPeaks":144,"restoredWaveformPeaks":147},"The close of Churchill's address","/media/blog/churchill-congress-1941-restored/churchill-close-original.mp3","/media/blog/churchill-congress-1941-restored/churchill-close-restored.mp3",[50,60,73,50,50,58,57,78,50,50,53,44,103,103,50,50,60,99,50,109,63,58,50,127,50,109,46,50,82,50,50,62,132,55,87,65,50,57,50,50,59,87,75,50,50,43,50,88,60,68,57,50,50,61,101,83,145,112,97,50,61,101,72,69,50,50,145,74,54,50,66,50,86,126,50,50,146,128,81,50,105,96,50,50,68,44,50,126,50,50,54,51,68,68,42,61],0.87,0.99,[50,56,110,50,50,87,68,133,50,50,85,43,62,97,50,50,105,45,50,46,46,45,50,82,50,100,127,50,132,50,50,42,129,87,98,46,50,103,50,50,124,76,46,50,50,82,50,43,133,112,126,50,50,89,77,44,146,50,66,50,61,129,123,50,50,50,61,148,88,50,59,50,74,109,50,50,61,104,124,50,96,149,50,50,65,129,50,99,50,50,59,50,97,50,50,50],0.91,0.6,{"kind":114,"html":151},"\u003Cp>He ends on the hope that "the British and American peoples will for their own safety and for the good of all walk together in majesty, in justice and in peace."\u003C/p>\n\u003Cp>Americans were reacting to the same war in their own voices that month: hear the \u003Ca href=\"/blog/pearl-harbor-1941-man-on-the-street-restored/\">Pearl Harbor street interviews\u003C/a> recorded for the Library of Congress.\u003C/p>\n\u003Ch2 id=\"for-journalists-educators-and-museums\">For journalists, educators and museums\u003C/h2>\n\u003Cp>Link this page and credit the National Archives for the recording. The whole address is on the \u003Ca href=\"https://catalog.archives.gov/id/2194729\">catalog page\u003C/a>.\u003C/p>\n\u003Cdetails class=\"blog-details\">\u003Csummary>Credit line and questions\u003C/summary>\u003Cdiv class=\"blog-details__body\">\u003Cdiv class=\"blog-table blog-table--notes\" role=\"region\" aria-label=\"Table 1: Reuse, Details\" tabindex=\"0\">\u003Ctable>\n\u003Cthead>\n\u003Ctr>\n\u003Cth>Reuse\u003C/th>\n\u003Cth>Details\u003C/th>\n\u003C/tr>\n\u003C/thead>\n\u003Ctbody>\n\u003Ctr>\n\u003Ctd>Source\u003C/td>\n\u003Ctd>\u003Ca href=\"https://catalog.archives.gov/id/2194729\">National Archives: Prime Minister Winston Churchill's Address to a Joint Session of Congress\u003C/a>\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Credit line\u003C/td>\n\u003Ctd>"Recording: CBS broadcast, National Archives; restored with Diffio AI (diffio.ai)"\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Questions\u003C/td>\n\u003Ctd>Write to me at \u003Ca href=\"mailto:nathan.harmon@diffio.ai\">nathan.harmon@diffio.ai\u003C/a>\u003C/td>\n\u003C/tr>\n\u003C/tbody>\n\u003C/table>\n\u003C/div>\u003Cp>The same kind of restoration works on recordings closer to home: a grandfather's cassette, a reel of a town meeting, an oral history taped in a noisy hall. You can hear the result on three free uploads at \u003Ca href=\"/\">diffio.ai\u003C/a>; downloads need a paid plan.\u003C/p>\u003C/div>\u003C/details>",false,[154,157,160,163,166],{"id":155,"text":156,"label":156},"how-to-compare-the-original-and-restored-passages","How to compare the original and restored passages",{"id":158,"text":159,"label":159},"what-kind-of-a-people-do-they-think-we-are","\"What kind of a people do they think we are?\"",{"id":161,"text":162,"label":162},"i-might-have-got-here-on-my-own","\"I might have got here on my own\"",{"id":164,"text":165,"label":165},"in-majesty-in-justice-and-in-peace","\"In majesty, in justice and in peace\"",{"id":167,"text":168,"label":168},"for-journalists-educators-and-museums","For journalists, educators and museums",[170,176,179,182,184,187],{"kind":171,"src":38,"name":172,"caption":173,"posterSrc":173,"comparisonRole":174,"durationSeconds":175},"audio","Original (CBS broadcast, National Archives), Winston Churchill to Congress, December 26, 1941",null,"original",38,{"kind":171,"src":39,"name":177,"caption":173,"posterSrc":173,"comparisonRole":178,"durationSeconds":175},"Restored with Diffio, Winston Churchill to Congress, December 26, 1941","restored",{"kind":171,"src":119,"name":180,"caption":173,"posterSrc":173,"comparisonRole":174,"durationSeconds":181},"Original (CBS broadcast, National Archives), Churchill's opening to Congress",134,{"kind":171,"src":120,"name":183,"caption":173,"posterSrc":173,"comparisonRole":178,"durationSeconds":181},"Restored with Diffio, Churchill's opening to Congress",{"kind":171,"src":142,"name":185,"caption":173,"posterSrc":173,"comparisonRole":174,"durationSeconds":186},"Original (CBS broadcast, National Archives), the close of Churchill's address",49,{"kind":171,"src":143,"name":188,"caption":173,"posterSrc":173,"comparisonRole":178,"durationSeconds":186},"Restored with Diffio, the close of Churchill's address",[190,213,237,267],{"slug":191,"path":192,"title":193,"description":194,"publishedAt":195,"updatedAt":195,"author":9,"category":10,"tags":196,"featureImage":197,"ogImage":203,"canonical":204,"seoTitle":205,"seoDescription":206,"keywords":207,"readingTimeMinutes":30,"wordCount":212,"relatedNote":173},"edward-viii-abdication-1936-restored","/blog/edward-viii-abdication-1936-restored/","Edward VIII's abdication broadcast, 1936: hear it restored","The speech the BBC says its engineers recorded in defiance of orders: Edward VIII giving up the throne on December 11, 1936, before and after restoration with Diffio AI.","2026-11-06T18:00:00Z",[12,13],{"src":198,"alt":199,"widthPixels":200,"heightPixels":201,"srcset":202},"/media/blog/edward-viii-abdication-1936-restored/abdication-spectrogram.webp","Spectrograms of Edward VIII saying \"the woman I love\" in his 1936 abdication broadcast, original and restored with Diffio AI",1400,640,"/media/blog/edward-viii-abdication-1936-restored/responsive/abdication-spectrogram-480w.webp 480w, /media/blog/edward-viii-abdication-1936-restored/responsive/abdication-spectrogram-800w.webp 800w, /media/blog/edward-viii-abdication-1936-restored/responsive/abdication-spectrogram-1200w.webp 1200w, /media/blog/edward-viii-abdication-1936-restored/abdication-spectrogram.webp 1400w",{"src":198,"alt":199,"widthPixels":200,"heightPixels":201,"srcset":202},"https://diffio.ai/blog/edward-viii-abdication-1936-restored/","Edward VIII abdication speech restored: hear the 1936 talk","Hear Edward VIII's 1936 abdication broadcast, \"the woman I love\", original and restored side by side, ahead of its 90th anniversary.",[208,209,210,211,29],"Edward VIII abdication speech","abdication speech recording","the woman I love speech","December 11 1936 broadcast",513,{"slug":214,"path":215,"title":216,"description":217,"publishedAt":218,"updatedAt":218,"author":9,"category":10,"tags":219,"featureImage":222,"ogImage":228,"canonical":229,"seoTitle":173,"seoDescription":173,"keywords":230,"readingTimeMinutes":235,"wordCount":236,"relatedNote":173},"podcast-audio-quality-study-2026","/blog/podcast-audio-quality-study-2026/","We measured the sound of 1,438 podcasts: the charts don't sound better than the long tail","A measured study of speech quality in 3,525 podcast episodes: chart shows match long-tail shows, genres differ, and the same shows have barely changed since 2017.","2026-11-06T14:51:00Z",[220,221],"Podcasting","Research",{"src":223,"alt":224,"widthPixels":225,"heightPixels":226,"srcset":227},"/media/blog/podcast-audio-quality-study-2026/podcast-quality-by-genre.webp","Bar chart of median speech quality score by podcast genre, from Technology at 4.27 down to Kids and Family at 3.54",1430,1040,"/media/blog/podcast-audio-quality-study-2026/responsive/podcast-quality-by-genre-480w.webp 480w, /media/blog/podcast-audio-quality-study-2026/responsive/podcast-quality-by-genre-800w.webp 800w, /media/blog/podcast-audio-quality-study-2026/responsive/podcast-quality-by-genre-1200w.webp 1200w, /media/blog/podcast-audio-quality-study-2026/podcast-quality-by-genre.webp 1430w",{"src":223,"alt":224,"widthPixels":225,"heightPixels":226,"srcset":227},"https://diffio.ai/blog/podcast-audio-quality-study-2026/",[231,232,233,234],"podcast statistics 2026","podcast audio quality","podcast audio quality statistics","podcast sound quality by genre",6,1409,{"slug":238,"path":239,"title":240,"description":241,"publishedAt":242,"updatedAt":243,"author":9,"category":10,"tags":244,"featureImage":245,"ogImage":251,"canonical":255,"seoTitle":256,"seoDescription":257,"keywords":258,"readingTimeMinutes":265,"wordCount":266,"relatedNote":173},"jfk-fort-worth-1963-last-speeches-restored","/blog/jfk-fort-worth-1963-last-speeches-restored/","Hear JFK's last two speeches, Fort Worth, November 22, 1963, restored","President Kennedy's rally in the rain and his Chamber of Commerce breakfast on the morning of November 22, 1963, from the JFK Library's recordings, before and after restoration with Diffio AI.","2026-11-05T01:30:00Z","2026-11-05T07:21:06Z",[12,13],{"src":246,"alt":247,"widthPixels":248,"heightPixels":249,"srcset":250},"/media/blog/jfk-fort-worth-1963-last-speeches-restored/jfk-rally-spectrogram-v2.webp","Spectrograms of President Kennedy's Fort Worth rally recording, November 22, 1963, original and restored with Diffio AI",940,616,"/media/blog/jfk-fort-worth-1963-last-speeches-restored/responsive/jfk-rally-spectrogram-v2-480w.webp 480w, /media/blog/jfk-fort-worth-1963-last-speeches-restored/responsive/jfk-rally-spectrogram-v2-800w.webp 800w, /media/blog/jfk-fort-worth-1963-last-speeches-restored/jfk-rally-spectrogram-v2.webp 940w",{"src":252,"alt":240,"widthPixels":17,"heightPixels":253,"srcset":254},"/media/blog/jfk-fort-worth-1963-last-speeches-restored/social-card.png",630,"/media/blog/jfk-fort-worth-1963-last-speeches-restored/responsive/social-card-480w.webp 480w, /media/blog/jfk-fort-worth-1963-last-speeches-restored/responsive/social-card-800w.webp 800w, /media/blog/jfk-fort-worth-1963-last-speeches-restored/social-card.png 1200w","https://diffio.ai/blog/jfk-fort-worth-1963-last-speeches-restored/","JFK's last speeches restored: Fort Worth, November 22, 1963","Hear President Kennedy's Fort Worth rally and breakfast speech from November 22, 1963, original and restored side by side, from JFK Library recordings.",[259,260,261,262,263,264,29],"JFK last speech","Kennedy Fort Worth speech","November 22, 1963","Hotel Texas rally","Fort Worth Chamber of Commerce breakfast","JFK Library White House audio",3,798,{"slug":268,"path":269,"title":270,"description":271,"publishedAt":272,"updatedAt":273,"author":9,"category":274,"tags":275,"featureImage":277,"ogImage":283,"canonical":286,"seoTitle":287,"seoDescription":288,"keywords":289,"readingTimeMinutes":297,"wordCount":298,"relatedNote":173},"save-a-loved-ones-voice-recording","/blog/save-a-loved-ones-voice-recording/","How to save a loved one's voice from a voicemail or old family video, and clean it up","A practical guide to saving a loved one's voice from a phone voicemail, a cassette or an old family video, keeping the original safe, and making the voice easier to hear.","2026-11-04T09:00:00Z","2026-11-05T06:54:57Z","guides",[12,276],"Family history",{"src":278,"alt":279,"widthPixels":280,"heightPixels":281,"srcset":282},"/media/blog/save-a-loved-ones-voice-recording/lead-diagram.webp","Diagram of four steps: save the recording to a file, keep the original in two places, clean up a copy and compare it by ear, share the clean copy with family.",1440,810,"/media/blog/save-a-loved-ones-voice-recording/responsive/lead-diagram-480w.webp 480w, /media/blog/save-a-loved-ones-voice-recording/responsive/lead-diagram-800w.webp 800w, /media/blog/save-a-loved-ones-voice-recording/responsive/lead-diagram-1200w.webp 1200w, /media/blog/save-a-loved-ones-voice-recording/lead-diagram.webp 1440w",{"src":284,"alt":270,"widthPixels":17,"heightPixels":253,"srcset":285},"/media/blog/save-a-loved-ones-voice-recording/social-card.png","/media/blog/save-a-loved-ones-voice-recording/responsive/social-card-480w.webp 480w, /media/blog/save-a-loved-ones-voice-recording/responsive/social-card-800w.webp 800w, /media/blog/save-a-loved-ones-voice-recording/social-card.png 1200w","https://diffio.ai/blog/save-a-loved-ones-voice-recording/","How to save a loved one's voice from a voicemail or video","How to save a loved one's voice from a voicemail, cassette or old family video, keep the original safe, and make the voice easier to hear.",[290,291,292,293,294,295,296],"save a voicemail","save voicemail from iPhone","export voicemail on Android","digitize cassette tapes","transfer VHS family videos","back up family recordings","clean up old voice recordings",4,1028,[],1794173866909]