Notes
A collection of fragments of understanding in the pursuit of deeper questions.
Contents
- Computational Vision
- Introduction to Data Science
- Translational Neuromodeling
- Deep Learning in Artificial & Biological Neuronal Networks
- Introduction to Neuroinformatics
- Intro to Neuroscience
- Systems Neuroscience
- Readings in Neuroinformatics
- Neurobiology of Consciousness
- Econometrics
- Principles of Finance
- Big Data & Databases
- Game Theory
- Intro to Blockchain
- Marketing Analytics
- Financial Accounting
- Fundamentals of Computer Science
- Foundamentals of Information Technology Law
- Statistics
- Computer Programming
- Macroeconomics
- EU Information Law & Data Economy
- Advanced Mathematics & Statistics
- Principles of Management
- Mathematics
- Microeconomics
The Physics of Sound
Sound is a vibration that propagates as an acoustic wave through a transmission medium such as air. Audition is the ability of the organs evolved by humans to perceive these changes in air pressure which are then translated in our sensation of sounds.
Amplitude and Wavelength are the parameters of the waves generated by the vibrating body.
Measuring Sound Intensity Sound intensity is related to the changes of amplitude of the waves. And the Decibels are a perceptual measurement. We are sensitive to an enormous range of intensities, so a logarithmic scale works well. Intensity in dB = 20 x log(P1/P2) where P2 is 20 Micropascal, which is the reference air pressure, i.e., the minimal air pressure difference that humans can detect.
From the graph above, it can be noticed that cats need lower intensity to be able to hear sounds keeping frequency constant. In addition, the frequencies that require the lowest intensity to be heard in humans are those associated with human speech, because our ear is perfectly tuned for that.
Fourier Analysis
"Any complex waveform can be represented as the sum of a series of sine waves of different frequencies and amplitudes". This is very important to understand how the cochlea works because it seems to be performing a type of Fourier analysis, by decomposing the sound waves."