![]() Lecture 41 - Directivity Pattern, Directivity Factor, Directivity Index Lecture 40 - Interference of n-Sound Sources with Zero Phase Difference Lecture 39 - Interference of Four Sound Sources with Zero Phase Difference Lecture 38 - Interference of Two Sound Sources with Zero Phase Difference Lecture 37 - Interference of Two Sound Sources Lecture 36 - Comparison of Impedances for a Radially Propagating Wave and a Planar Wave Lecture 33 - Specific Acoustic Impedance for a Tube with Imperfect Termination Lecture 32 - Specific Acoustic Impedance for an Open Tube and an Infinitely Long Tube Lecture 31 - Specific Acoustic Impedance for a Closed Tube Lecture 30 - Relations for Outward Travelling Spherical Acoustic Wave Lecture 28 - Power Flow into an Infinitely Long Tube Lecture 27 - Power Factor, and Acoustic Power Lecture 26 - Instantaneous Power in a L-R Circuit Lecture 24 - Sound Propagation in a Open Tube Lecture 23 - Sound Propagation in Closed Tubes Lecture 22 - Sound Propagation in a Closed Tube Lecture 21 - Transmission Line Equations for Pressure and Velocity Lecture 20 - Sound Propagation in a Semi-Infinite Tube Lecture 18 - Solution for 1-D Sound Wave Equation Lecture 16 - Gas Law for 1-D Sound Propagation Lecture 15 - Continuity Equation for 1-D Sound Propagation Lecture 14 - Momentum Equation for 1-D Sound Propagation Lecture 13 - Bode Plots (Magnitude) for Complex Transfer Functions Lecture 12 - Important Mathematical Concepts - Bode Plot for Simple Zero Lecture 11 - Important Mathematical Concepts - Bode Plot for Simple Pole Lecture 10 - Important Mathematical Concepts - Pole Zero Plot Lecture 09 - Important Mathematical Concepts - Transfer Function Lecture 08 - Important Mathematical Concepts - Complex Time Signals Lecture 07 - Important Mathematical Concepts - Complex Algebra Go to the Course Home or watch other lectures: ![]() This lecture covers the following topics: 1) Octave band analysis, 2) Octave band plot, 3) Standard octave bands, 4) Forward and inverse Discrete Fourier Transform (DFT). Lecture 67 - Octave Band Analysis, Part I This course provides the basics of acoustics, and covers topics in the field: the nature of sound, sound terminology, overview of some important mathematical concepts like complex algebra and complex time signals, wave equation, sound propagation in a tube, acoustic power, spherical waves, interference of sound sources, noise reduction by mass attenuation, designing mufflers, Fourier series and (Fast) Fourier Transforms, microphones, weighting, loudness, octave band analysis, reverberation time, sound transmission class, and noise reduction coefficient. Nachiketa Tiwari, Department of Mechanical Engineering, IIT Kanpur. That's pretty much the exact opposite of what the poster wants.Fundamentals of Acoustics. Unfortunately, everybody thinks that in order to differentiate themselves from the world, they have to make a graphics heavy, enormously complicated tool. That's the definitive tool that tells you your show is out of phase. I've been dying for one of those forever. They have a Lissajous pattern which means they have an audio vectorscope in there. I'm interested in this one for the wrong reasons. Clearly a tall Caucasian male wearing a tasteful red dress and patent leather pumps." "Let's apply this Ferris-Trankis Anaylizer to the voice and you can go right out and arrest the culprit." "Ooooooo. The joke with that display is that it's most useful as a prop in cops and robbers TV shows. I think what they consider the spectrum view is that waterfall thing. That one has possibilities, probably because they don't show you any graphics on the web site. ![]()
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