SDR時代のFM受信 マルチパスモニタとマルチパスフィルタ / FM broadcast reception with SDR - multipath monitor and multipath filter

BCLの集い「秋葉原ミーティング」2019年10月5日 発表原稿

Transcript

1. SDR࣌୅ͷFMड৴
   ϚϧνύεϞχλͱ
   ϚϧνύεϑΟϧλ
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 1
   

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2. Kenji Rikitake
   Γ͖͚ͨ ͚Μ͡
   ྗ෢ ݈࣍
   5-OCT-2019
   BCL Akihabara Mee6ng
   Akihabara T-Space
   Taito, Tokyo, Japan
   @jj1bdx
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 2
   

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3. ٕज़࢜ʢ৘ใ޻ֶ෦໳ʣ
   ྗ෢݈ٕ࣍ज़࢜ࣄ຿ॴ ॴ௕
   ϖύϘݚڀॴ ٬һݚڀһ
   BCLྺ 46೥
   ࠷ۙ͸SDRͷݚڀ։ൃத
   ͖ͤ΍·͞ΜͷإΛݟʹདྷ·ͨ͠
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 3
   

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4. ࠓ೔ͷ࿩୊
   FMͷ඼࣭Լ͛ΔϚϧνύε
   ௚ަมௐ → ϚϧνύεϞχλ
   దԠϑΟϧλ → ϚϧνύεϑΟϧλ
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 4
   

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5. FMͱϚϧνύε
   ෳ਺ܦ࿏Λ௨Δి೾ͷׯব
   ׯবੑϑΣʔδϯάͰৼ෯͕มԽ
   ৼ෯ͷมԽ͸ଈࠁҐ૬ͷ࿪Έ
   Ґ૬͕࿪Ήͱͱͯ΋ෆշͳԻ͕͢Δ
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 5
   

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6. ϚϧνύεϞχλ
   ͳΜͱ͔Ϛϧνύεͷ౓߹͍ΛϞχλʔ͍ͨ͠
   ௚ײతʹଌఆͰ͖ͳ͔ͬͨ
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 6
   

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7. FMͷεςϨΦࠩ৴߸
   Ի੠ଳҬͷDSB
   38kHzͰมௐ
   19kHzͷύΠϩοτ৴߸ʹಉظ
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 7
   

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8. AMͷ௚ަมௐ
   AM͸2ͭͷ৘ใΛӡ΂Δ
   sin͸ͲΜͳʹ͕Μ͹ͬͯ΋cosʹ͸ͳΒͳ͍
   cos͸ͲΜͳʹ͕Μ͹ͬͯ΋sinʹ͸ͳΒͳ͍
   ͳΒcosͱsinͰ2ͭ৘ใ͕ӡ΂ͦ͏
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 8
   

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9. ௚ަมௐϚϧνύεϞχλ(QMM)
   Brian Beezley, K6STIʹΑΓߟҊ
   sinͰมௐͨ͠৴߸͸cosͰ͸ݕग़Ͱ͖ͳ͍ɺ͸ͣ
   ͔࣮͠͠ࡍʹ͸࿪Έ͕ൃੜͯ͠৴߸͕ग़ͯ͘Δ
   ͩͬͨΒͦͷ࿪ΈΛcosͰݕग़ͯ͠Ϟχλͯ͠ΈΑ͏
   Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 9
   

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10. QMMͷར఺
    ΄ͱΜͲͷ์ૹʹద༻Մ
    ԻͰग़ͯ͘ΔͷͰΘ͔Γ΍͍͢
    Իͷେ͖͞ͰϚϧνύεͷࠅ͕͞Θ͔Δ
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 10
    

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11. ࣍ͷ࿩୊
    FMͷϚϧνύεϑΟϧλ
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 11
    

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12. ϚϧνύεϑΟϧλ
    ϚϧνύεͰ࿪Μͩ৴߸Λݩʹ໭͢
    Ͳ͏΍ͬͯ?
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 12
    

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13. FMͷϚϧνύε࿪Έ
    FM͸ૹ৴࣌ৼ෯Ұఆ
    ෳ਺ͷ࣌ؒࠩͰ౸ணͨ͠৴߸͕ׯব
    Ϛϧνύε࿪Έ͸ৼ෯ʹݱΕΔ
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 13
    

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14. ΍ͬͯ͸͍͚ͳ͍͜ͱ
    ৼ෯Ұఆʹڧ੍ͯ͠΋࿪Έ͸ফ͑·
    ͤΜ!
    Ϧϛολ͸ແҙຯͰ͢
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 14
    

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15. ݪཧʹ஧࣮ʹߟ͑Δ
    ෳ਺ͷ஗Ԇ৴߸͕ׯব͍ͯ͠ΔͷͰ͋Ε͹ɺ
    ͦͷׯবͷٯԋࢉΛߦͬͯऔΓআ͍ͯ΍Ε͹
    Α͍
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 15
    

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16. ۩ମతͳํ๏
    ஗Ԇ৴߸Λଧͪফ͢ϑΟϧλΛ࡞Γɺͦͷ
    ϑΟϧλͷޮ͖ํΛ࿪Έ͕ͳ͘ͳΔΑ͏ʹஞ
    ࣍ௐ੔͍ͯ͘͠
    ͦΜͳ͜ͱ͕Ͱ͖Δͷ͔?
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 16
    

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17. దԠϑΟϧλΛ࢖͑͹Ͱ͖Δ
    ໨ඪ: ৼ෯ΛҰఆʹ͢Δ
    ৼ෯ͷࠩΛޡࠩͱ൑அ͢Δ
    ޡࠩ஋Λ࢖ͬͯϑΟϧλΛௐ੔
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 17
    

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18. దԠϑΟϧλͷ࣮૷ྫ
    1980೥୅ʹ࿦จൃද 1
    ྛً඙ࢯʹΑΔFMDDC-3
    ྗ෢ʹΑΔairspy-fmradion
    1 ๬݄ ޹ࢤ, Ӌௗ ޫढ़, దԠσΟδλϧϑΟϧλʹΑΔFMϚϧνύεͻͣΈࣗಈআڈͷҰํࣜ, ςϨϏδϣϯֶձࢽ,
    1985, 39 ר, 3 ߸, p. 228-234, ެ։೔ 2011/03/14, Online ISSN 1884-9652, Print ISSN 0386-6831, h>ps:/
    /doi.org/
    10.3169/itej1978.39.228, h>ps:/
    /www.jstage.jst.go.jp/arHcle/itej1978/39/3/39_3_228/_arHcle/-char/ja
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 18
    

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19. airspy-fmradion 2
    Airspy HF+΍RTL-SDRͱMac΍Raspberry Piͷ૊Έ߹ΘͤͰಈ࡞
    ߴڃFMνϡʔφʹඖఢ
    FMԕڑ཭ड৴ʹ΋ޮՌ
    ઈࢍ։ൃத
    2 h$ps:/
    /github.com/jj1bdx/airspy-fmradion
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 19
    

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20. Thank you
    Ques%ons?
    Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 20
    

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