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  • Fundamentals of Sound.
  • Sound Levels and the Decibel.
  • Sound in the Free Field.

 All of us speak and hear people blabber every day [Sigh...]. Those of us who are lucky also listen to music every day and some of us even play music. However, very few understand the theory behind music and sound.

Let me blow your mind and take you on a journey into Acoustics - a branch of physics concerned with the properties of sound.

Let us dive deep into the human ear and brush against the Stereocilia. By the end of this course you will know how to measure the exact frequency and amplitude of sound when your spouse yells at you, which we will term 'objectionable information carrying sound'.  More specifically:

In section 1: 'Fundamentals of Sound' we will explore The Sine Wave, Sound in Media, Particle Motion, Propagation of Sound, Speed of Sound, Wave 'length' and Frequency, Complex Waves, Harmonics, Phase, Partials, Octaves, Spectrum, Electrical, Mechanical, and Acoustical Analogs.

In section 2: 'Sound Levels and the Decibel' we will explore Ratios versus Differences, Expressing Numbers, Logarithms, Decibels, Reference Levels, Logarithmic and Exponential Forms Compared, Acoustic Power, Using Decibels, Sound-Pressure Level, Loudspeaker SPL, Microphone Specifications, Line Amplifier, General-Purpose Amplifier, Concert Hall, Combining Decibels, Measuring Sound-Pressure Level, and Sine-Wave Measurements.

In section 3: 'Sound in the Free Field' we will explore The Free Field, Sound Divergence, Sound Intensity in the Free Field, Sound Pressure in the Free Field, Examples: Free-Field Sound Divergence, Sound Fields in Enclosed Spaces, and Hemispherical Field and Propagation.

In section 4: 'The Perception of Sound' we will explore Sensitivity of the Ear, Ear Anatomy, The Outer Ear, Directional Cues, The Ear Canal, The Middle Ear, The Inner Ear, Stereocilia, Loudness versus Frequency, Loudness Control, Area of Audibility, Loudness versus Sound-Pressure Level, Loudness and Bandwidth, Loudness of Impulses, Audibility of Loudness Changes, Pitch versus Frequency, Pitch, The Missing Fundamental, Timbre versus Spectrum, Localization of Sound Sources, Binaural Localization, Law of the First Wavefront, The Franssen Effect, The Precedence Effect, Perception of Reflected Sound, The Cocktail-Party Effect, Aural Nonlinearity, Subjective versus Objective, and Occupational and Recreational Deafness.

In section 5: 'Signals, Speech, Music, and Noise' we will explore Sound Spectrograph, Speech, Vocal Tract Molding of Speech, Formation of Voiced Sounds, Formation of Unvoiced Sounds, Frequency Response of Speech, Directionality of Speech, Music, String Instruments, Wind Instruments, Nonharmonic Overtones, Dynamic Range of Speech and Music, Power in Speech and Music, Frequency Range of Speech and Music, Auditory Area of Speech and Music, Noise, Noise Measurements, Random Noise, White and Pink Noise, Signal Distortion, Harmonic Distortion, Resonance, and Audio Filters.

In section 6: 'Reflection' we will explore Specular Reflections, Flutter Echoes, Doubling of Pressure at Reflection, Reflections from Convex Surfaces, Reflections from Concave Surfaces, Reflections from Parabolic Surfaces, Whispering Galleries, Standing Waves,The Corner Reflector, Mean Free Path, Perception of Sound Reflections, The Effect of Single Reflections, Perception of Spaciousness, Images, and Echoes, Effect of Angle of Incidence, Signal Type, and Spectrum on Audibility of Reflection.

  • Come with an open mind.
  • Anyone interested in Acoustics
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  • Section 1 : Fundamentals of Sound 5 Lectures 00:32:30

    • Lecture 1 :
    • Lecture 2 :
    • Particle Motion
    • Lecture 3 :
    • Wavelength and Frequency
    • Lecture 4 :
    • Partials
    • Lecture 5 :
    • Spectrum
  • Section 2 : Sound Levels and the Decibel 4 Lectures 00:37:41

    • Lecture 1 :
    • Ratios versus Differences
    • Lecture 2 :
    • Logarithms
    • Lecture 3 :
    • Acoustic Power
    • Lecture 4 :
    • Combining Decibels
  • Section 3 : Sound in the Free Field 2 Lectures 00:09:51

    • Lecture 1 :
    • Sound Divergence
    • Lecture 2 :
    • Free-Field Sound Divergence
  • Section 4 : The Perception of Sound 11 Lectures 01:05:25

    • Lecture 1 :
    • The Perception of Sound
    • Lecture 2 :
    • The Outer Ear
    • Lecture 3 :
    • The Inner Ear
    • Lecture 4 :
    • Loudness Control
    • Lecture 5 :
    • Loudness versus Sound-Pressure Level
    • Lecture 6 :
    • Loudness and Bandwidth
    • Lecture 7 :
    • Summary
    • Lecture 8 :
    • Binaural Localization
    • Lecture 9 :
    • The Precedence Effect
    • Lecture 10 :
    • The Cocktail-Party Effect
    • Lecture 11 :
    • Occupational and Recreational Deafness
  • Section 5 : Signals, Speech, Music, and Noise 6 Lectures 00:51:56

    • Lecture 1 :
    • Signals, Speech, Music, and Noise
    • Lecture 2 :
    • Formation of Unvoiced Sounds
    • Lecture 3 :
    • Nonharmonic Overtones
    • Lecture 4 :
    • Noise
    • Lecture 5 :
    • Signal Distortion
    • Lecture 6 :
    • Resonance
  • Section 6 : Reflection 3 Lectures 00:17:34

    • Lecture 1 :
    • Reflection
    • Lecture 2 :
    • Reflections from Convex Surfaces
    • Lecture 3 :
    • Mean Free Path
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Hi :) I hope you'll let me share with you some wonderful teachings. I hold a PhD in Mythology & Occultism from Bircham University. I've been researching different spiritual and religious teachings, ancient and modern texts and the occult for the past decade. I specialize in channeled teachings. These are teachings that were transmitted to people from beings on the other side! I travelled the world in my quest to uncover hidden knowledge. I celebrated the new moon at a witch coven in New Zealand, I witnessed how a blind person begins to see in Mexico and helped ghosts complete their transition in Colombia. Research for me is not only about reading books, it's about people and culture. I uncover hidden knowledge about different planes of existence, enhancing psychic abilities, manipulating energies, how to heal and perform miracles, what happens after death, how to initiate an out of body experience and even extraterrestrial teachings and philosophies. These teachings are timeless and can help us find peace, tranquility and evolve spiritually. My goal in my courses is to help students find that inner peace and expand their consciousness. I hope you'll let me become a friend and a guide to this crazy world of hidden and sacred knowledge.
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