FM radio frequency的問題，透過圖書和論文來找解法和答案更準確安心。 我們找到下列懶人包和總整理

Dial Dancing: Tales of the the Fascinating, Fabulous, Frequency-hopping, Wavelength-Walking, Power Punching, Ionosphere-Scorchin

為了解決FM radio frequency的問題，作者Keith, Don 這樣論述：

Amateur or ham radio is more alive, more vibrant, more exciting and magical than ever. Now award-winning and best-selling author Don Keith, who is an active and enthusiastic amateur radio operator, spins a series of tales that show exactly what this amazing hobby offers. Help save lives with emergen

cy communications and weather spotting. Compete in radiosport. Talk with friends all over the planet, bouncing signals off the ionosphere, through ham radio satellites in orbit, or even using the tail of a comet, the moon, or the Northern Lights. Bring radio to mountaintops, remote islands, or natio

nal parks. And do it all with a station you helped put together. Now, with these exciting, emotional, funny and captivating tales, you can learn about the magic of amateur radio and how you can begin dancing around the dial. Don Keith is an award-winning broadcaster, a best-selling author, and has

been a licensed amateur radio operator since 1961. He was first licensed as WN4BDW in 1961, earned his General class license later that year, and then became an Amateur Extra class licensee in the mid-1970s, changing the call sign then to N4KC. He was twice named Billboard Magazine’s ＂Broadcast Per

sonality of the Year,＂ won every major broadcast journalism award in his state from the Associated Press and United Press International, and was an on-air personality, journalist, station owner, program director, and manager in a broadcasting career that spanned over two decades. Don published his f

irst novel, The Forever Season, in 1995. It has remained in print continuously since and was named ＂Fiction of the Year＂ by the Alabama Library Association. His more than two dozen other published works, fiction and non-fiction, cover such topics as NASCAR racing, broadcasting, college sports, subma

rines, biography, and World War II history. His submarine-thriller novel, Firing Point, will be a major motion picture starring Gerard Butler and Gary Oldman, released under the title Hunter Killer. His non-fiction book on the historic voyage to the North Pole of America’s first nuclear submarine, U

SS Nautilus, in 1958 was titled The Ice Diaries and was submitted for consideration for the Pulitzer Prize. For the fiftieth anniversary of the under-ice mission, Don headed up an amateur radio special operating event from Historic Ship Nautilus in Groton, Connecticut. Don lives in Indian Springs Vi

llage, Alabama, with his wife, Charlene. They have three grown children, and four grandchildren. Don operates all the shortwave amateur radio bands as well as VHF and uses most modes, including CW, SSB, PSK31 and FM. He enjoys DXing, contesting, antenna experimenting, and just plain rag-chewing. Don

’s author web site is www.donkeith.com. His amateur radio web site is www.n4kc.com and features a number of stories and articles about the hobby of interest to hams. Don also blogs on the subject of rapid technological change and its effect on media, society and amateur radio. Visit the blog at http

: //n4kc.blogspot.com.

FM radio frequency進入發燒排行的影片

基於距離都卜勒影像之跌倒偵測系統的設計與實現

為了解決FM radio frequency的問題，作者徐偉倫 這樣論述：

由於近年來深度學習技術的發展及普及，生活中許多的研究與發明，漸漸朝向人工智慧的方向發展，逐漸影響人們的日常體驗與生活，不論是在工商、金融、治安甚至是軍事及教育等等所有都能看到相關應用的出現，根據台灣衛福部統計處資料，在2019年跌倒事故傷害而過世的人竟然位居排行第二，故居家照護等相關應用也成了AI技術的一個重要議題，而跌倒偵測便是此次論文的研究重點。有別於市售的穿戴式裝置如蘋果手錶和項鍊式緊急通報跌倒偵測器，利用設備的陀螺移、三軸加速度計或ECG心電圖等技術來判斷，為了避免人員發生意外時未配戴裝置很引發憾事，我們參考了攝影機影像辨識的技術，在特定場域裝設裝置判斷人員有無跌倒狀況，但礙於隱私權

問題，會讓人有所顧慮，所以我們選擇了在場域架設雷達裝置來發展我們的跌倒偵測系統。透過頻率調變連續波雷達(FMCW)，收集其回傳的原始資料(Raw data)，進行計算，產出範圍都卜勒圖(Range Doppler Image)及長時間間格的都卜勒直方圖(Long Time Interval Range Doppler Histogram)，觀察其資料特徵，對圖片及影像進行資料分析及編輯，並撰寫輔助工具，完成資料的收集及標籤(Label)，最後則是設計觸發(Trigger)模型，辨識圖片距離及速度變化量明顯的圖形，結合根據資料型態所自定義的的演算法完成觸發的判斷，再將有觸發的情形結合都卜勒長方圖

丟至下一層基於雙向長短時記憶循環神經網路(Bi-directional Long Short-Term Memory)模型所設計的深度學習模型來做最後跌倒情形的判斷，並設計的簡易的告警機制，完成了高達90%以上準確率的跌倒偵測系統模型。

PSpice for Analog Communications Engineering

為了解決FM radio frequency的問題，作者Tobin, Paul/ Thornton, Mitchell (EDT) 這樣論述：

In PSpice for Analog Communications Engineering we simulate the difficult principles of analog modulation using the superb free simulation software Cadence Orcad PSpice V10.5. While use is made of analog behavioral model parts (ABM), we use actual circuitry in most of the simulation circuits. For ex

ample, we use the 4-quadrant multiplier IC AD633 as a modulator and import real speech as the modulating source and look at the trapezoidal method for measuring the modulation index. Modulation is the process of relocating signals to different parts of the radio frequency spectrum by modifying certa

in parameters of the carrier in accordance with the modulating/information signals. In amplitude modulation, the modulating source changes the carrier amplitude, but in frequency modulation it causes the carrier frequency to change (and in phase modulation it's the carrier phase). The digital equiva

lent of these modulation techniques are examined in PSpice for Digital communications Engineering where we examine QAM, FSK, PSK and variants. We examine a range of oscillators and plot Nyquist diagrams showing themarginal stability of these systems. The superhetrodyne principle, the backbone of mod

ern receivers is simulated using discrete components followed by simulating complete AM and FM receivers. In this exercise we examine the problems ofmatching individual stages and the use of double-tuned RF circuits to accommodate the large FM signal bandwidth.

使用自我注入鎖定雷達與廣義概似比檢驗法之在場感測

為了解決FM radio frequency的問題，作者許明煥 這樣論述：

本論文使用基於廣義概似比的二種檢定統計量，分別為算術平均與幾何平均法以及訊號子空間特徵值法，應用在2.4 GHz ISM頻帶的自我注入鎖定雷達與相位自我注入雷達。論文中所提出之演算法運用於判斷環境中是否存在移動的物體，透過生理感測雷達以克服其他感測器高誤判率以及無法偵測靜止不動物體的缺點。過程中，對於雷達的輸出訊號僅經過二種矩陣運算方法，分別為共變異數運算與特徵值分解，具有相當高的運算效率，且不受訊號直流位移影響。相對於傳統的方法需要二至三個週期以上的時間，文中所使用的演算法僅需要一個週期內的時間即可判斷。此外，結合序列分析方法與固定時間長度方法，使其具有更高的判斷準確率。在人體存在感測實驗

中，感測距離為1至3公尺，當環境中存在物體時，判斷準確率最高可達97.85 %，且誤判率最低僅為1.21 %，而訊號平均週期約略為5秒時，所需判斷時間僅為1.05秒。