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FFT Tutorial

Youtube

Tony and Ian from Tektronix present a FFT Tutorial (Fast Fourier Transform) covering what is FFT, an explanation of the FFT function as well as different FFT applications. They explain how the FFT works with a FFT example and show an oscilloscope demo to demonstrate how helpful the FFT can be. What is FFT? In the video, "How to Use an Oscilloscope" (http://youtu.be/tzndcBJu-Ns), an oscilloscope was used to look at a single sine wave. But when you connect an oscilloscope to a live circuit, you rarely see something so simple. On real projects, you're usually looking at combinations of signals. The FFT lets you break down the data you've captured and see what it's made of. FFT Example One FFT example is when you want to understand your own signal. If you're designing a circuit board, and you attach your oscilloscope probe at the antenna, you're expecting the signal at the antenna to be at the frequency you designed it for. What you actually see is an extra signal. That extra signal is at a different frequency, and it's one you didn't expect to see. You'll notice you can't see it on the regular oscilloscope display before the FFT because it's 1/1000th the amplitude of the signal you're expecting. In the video FFT example, the cause is likely harmonic distortion since it's a multiple of the frequency we're expecting. If it were an exact multiple of some known clock board, then the likely cause would be cross-talk. How FFT Works The FFT helps you see what kinds of signals are present in your system. Specifically, it breaks down your complicated signal into separate sine waves. Any signal at all can be thought of as the sum of different sine waves (the Fourier Transform). The oscilloscope's FFT, or Fast Fourier Transform, is just one method of performing this operation. FFT Applications Most oscilloscopes have a FFT built into their math system these days. In the oscilloscope featured in the video, you just press Math and then turn on the FFT option. Then you can set various properties of the analysis, like the frequency range you want to look at. In the video example, you can see that same series of frequency-domain spikes stretching out. This is kind of a pared-down version of what you'd see on a spectrum analyzer. If you wanted something more like a real spectrum analyzer, you could use a mixed domain oscilloscope with a dedicated RF channel. The mixed domain oscilloscope in the video shows a FFT of the signal from a completely separate input. The idea is that you use the regular analog channels to look at the various signals on your board, and use the RF channel to see what's actually coming out of your antenna port. For more FFT Information go to: www.tek.com/fft-basics Also, keep an eye out for the next video in this series, covering a FFT example where the FFT function is used to measure musical signals in front of a live audience.

Last download 9 hours ago

O'Neill Cylinders

Youtube

A look at O'Neill Cylinders, immense space habitats. Visit our sponsor, Brilliant: https://brilliant.org/IsaacArthur/ Far larger than any conventional Space Station, O'Neill Cylinders could potentially serve as as entire city-states or nature preserves. Today we will review how these megastructures might be built and how they may represent a superior option to terraforming planets. Visit our Website: http://www.isaacarthur.net Join the Facebook Group: https://www.facebook.com/groups/1583992725237264/ Support the Channel on Patreon: https://www.patreon.com/IsaacArthur SFIA Merchandise available: http://signil.com/sfia To help us grow your SFIA community, follow https://twitter.com/Isaac_A_Arthur on Twitter and RT our future content. Visit the sub-reddit: https://www.reddit.com/r/IsaacArthur/ Listen or Download the audio of this episode from Soundcloud: https://soundcloud.com/isaac-arthur-148927746/oneill-cylinders Cover Art by Jakub Grygier: https://www.artstation.com/artist/jakub_grygier Writers: Isaac Arthur Script Editors: Darius Said Keith Blockus Konstantin Sokerin Mark Warburton Matthew Acker Michael Gusevsky MolbOrg Sigmund Kopperud Sam McNamara Producer Isaac Arthur Cover Artist Jakub Grygier Graphics Team Jarred Eagley Jeremy Jozwik Justin Dixon Katie Byrne Kris Holland (Mafic Studios) www.maficstudios.com Sam McNamara (Rapid Thrash) Sergio Botero https://www.artstation.com/sboterod?fref=gc Narrator: Isaac Arthur Music Manager: Luca De Rosa - lucaderosa2@live.com Music: Markus Junnikkala, "We Roam the Stars" https://www.markusjunnikkala.com/ Kai Engel, "Endless Story About Sun and Moon" https://www.kai-engel.com/ Brandon Liew, "Mystic Forest Orchestral Fantasy" https://soundcloud.com/brandon-liew Ayreon, "String Theory" http://www.arjenlucassen.com Chris Zabriskie, "Stories About the World That Once Was" https://soundcloud.com/chriszabriskie Markus Junnikkala, "A Memory Of Earth" Phase Shift, "Enigmatic." NJ Mandaville, "The Resting Vale" https://soundcloud.com/nj-mandaville Dracovallis, "The Grave of My Beloved" https://dracovallis.bandcamp.com/ Sergey Cheremisinov, "White Atlantis" https://sergeycheremisinov.bandcamp.com/

Last download 9 hours ago

BAIXAR E INSTALAR SOLIDWORKS 2018 FULL PT BR 64 Bits BAIXAR E INSTALAR + SolidWorksCAM Integrado

Youtube

Veja nesse vídeo como baixar e instalar o Solidworks 2018 64 Bits FULL PORTUGUÊS BR "Download Solidworks 2018 PT Br FULL " LINK PARA DOWNLOAD DO TORRENT======================= https://mega.nz/#!oCQmWADS!C3EX2slALZZdOXcgRPtjhH56m6zy71Ud6BiKeI5buMs ==================================================== Como baixar solidworks 2018 Fazer Download Solidworks 2018 Como instalar solidworks 2018 Como ativar Solidworks 2018 Novidades do Solidworks 2018 Qualquer dúvida entrem em contato comigo pelas minhas redes sociais caso tenha alguma dúvida ou sugestão para o canal e acompanhe o meu dia a dia, em casa, no trabalho, em férias, gravando vídeos e muito mais é só clicar nos links abaixo: PLAY LIST SOLIDWORKS BÁSICO========================== https://goo.gl/Ks3Cgg - Módulo Básico de SolidWorks ====================================================== PLAY LIST CHAPAS METÉLICAS============================ https://goo.gl/Iwx3vp - Módulo Chapas Dobradas SolidWorks ====================================================== FACEBOOK ============================================ https://goo.gl/9zQUJt - SolidWorks Cursos @solidworkscursos ====================================================== INSTAGRAM=========================================== https://goo.gl/8ZgvPA - rchiozzini ====================================================== SNAPCHAT============================================ rchiozzini - Rodrigo Chiozzini ====================================================== TWITTER============================================== https://goo.gl/oSzJSc - @rchiozzini ====================================================== YOUTUBE============================================== https://goo.gl/gVo7Ml - SOLIDWORKS CURSOS ====================================================== LINKEDIN============================================== https://goo.gl/pBalJ6 - Rodrigo E. Chiozzini ======================================================

Last download moments ago

Amazing Animation of a Fetus Growing in the Womb

Youtube

Music: Jujitsu Flow by Dhruva Aliman https://dhruvaaliman.bandcamp.com/album/road-of-fortunes Spotify - https://open.spotify.com/artist/5XiFCr9iBKE6Cupltgnlet http://www.dhruvaaliman.com/ ........An Fx studio's Video production showing human development from a sperm to a baby. This video performs you the process of a fertilized egg to a baby in 3D!! Excerpt from French documentary L'Odyssée de la Vie. ...Explanations - After sexual intercourse, sperm travels through the cervix and uterus and into the Fallopian tubes. Conception usually takes place in the outer third of the Fallopian tube. A single sperm penetrates that egg and a joining of the genetic information occurs. This resulting single cell is called a zygote. The zygote spends the next few days traveling down the Fallopian tube and rapidly multiplying the number of cells through division. A mulberry-like mass, like a hollow rubber ball, 1/100 inch wide, results from the cell division. This ball of cells in the Fallopian tube is called a morula. The embryonic stage begins on the 15th day after conception and continues until about the 8th week, or until the embryo is 1.2 inches in length. Week 3 we see the formation of the heart, the beginning development of the brain and spinal cord, and the beginning of the gastrointestinal tract. Weeks 4 and 5 -1/4 inch long: Here we see the beginnings of the vertebra, the lower jaw, the larynx ("voice box"), and the rudiments of the ear and eye. The heart, which is still outside body, now beats at a regular rhythm. Although arm and leg "buds" are visible with hand and foot "pads," the embryo still has a tail and cannot be distinguished from pig, rabbit, elephant, or chick embryo by an untrained eye. Week 6 - 1/2 inch, 1/1000 of an ounce: In week 6, we see the formation of the nose, jaw, palate, lung buds. The fingers and toes form, but may still be webbed. The tail is receding, and the heart is almost fully developed. Week 7 - 7/8 inch, 1/30 ounce (less than an aspirin): This week, the eyes move forward on the face, and the eyelids and tongue begin to form. All essential organs have begun to form. Week 8 -1 inch, 1/15 ounce: The embryo now resembles a human being. The facial features continue to develop and the external ear appears. Also, we see the beginnings of external genitalia. By now, the circulation through the umbilical cord is well developed. The long bones begin to form and the muscles are able to contract. At this point the embryo is developed enough to call a fetus. All organs and structures found in a full-term newborn are present. Weeks 9 to 12 - 3 inches, 1 ounce: The head comprises nearly half of the fetus' size and the face is well formed. The eyelids close now and will not reopen until about the 28th week. The tooth buds for the baby teeth appear. The genitalia are now clearly male or female. Weeks 13 to 16 - 6 inches: These weeks mark the beginning of the second trimester. Although the skin of the fetus is almost transparent, fine hair develops on the head called lanugo. The fetus makes active movements, including sucking, which leads to some swallowing of the amniotic fluid. A thin dark substance called meconium is made in the intestinal tract. The heart beats120-150 beats per minute and brain waves detectable. Weeks 17 to 20 - 8 inches: Eyebrows and lashes appear and nails appear on fingers and toes. This is an exciting time for the parents: The mother can feel the fetus moving ("quickening") and the fetal heartbeat can be heard with a stethoscope. Weeks 21 to 24 - 11.2 inches, 1 lb. 10 oz.: All the eye components are developed, footprints and fingerprints are forming, and the entire body covered in cream-cheese-like vernix caseosa. The fetus now has a startle reflex. Weeks 25 to 28 - 15 inches, 2 lbs. 11 oz.: Now we are entering the third trimester. During these weeks, we see rapid brain development. The nervous system is developed enough to control some body functions, and the eyelids open and close. A baby born at this time may survive, but the chances of complications and death are high. Weeks 29 to 32 - 15 to 17 inches, 4 lbs. 6 oz.: These weeks see further development towards independent life: There is a rapid increase in the amount of body fat and the fetus begins storing its own iron, calcium, and phosphorus. The bones are fully developed, but still soft and pliable. There are rhythmic breathing movements present, the fetal body temperature is partially self-controlled, and there is increased central nervous system control over body functions. Weeks 33 to 36 - 16 to 19 inches, 5 lbs. 12 oz. to 6 lbs. 12 oz.: The lanugo (body hair) begins to disappear. A baby born at 36 weeks has a high chance of survival. Weeks 37 to 40 - 19 to 21 inches 7 or 8 pounds: At 38 weeks, the fetus is considered full term.

Last download 17 minutes ago