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Lecture1 – Sound, Characteristics of sound

Lecture1 – Sound, Characteristics of sound

              So, the important points: What is necessary to have a sound, respectively, the feeling for such phenomenon? 1. vibrating unit; 2. Environment in which these vibrations spread; 3. Someone perceiving the vibrations. Definition for sound: Sound – it’s the feeling, caused by the vibration of a flexible body in versatile medium.   Next, the characteristics of sound: The main characteristics are four. 1.The first characteristic is the frequency of vibrations. This is the number of vibrations per second. It is measured in Herz (Hz). the range between … Read entire article »

Filed under: ESPOL

Lecture 2 – Microphones

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Lecture 3 Part 1 – Analog recording

Lecture 3  Part 1 – Analog recording

     We use electro-acoustic transducers to capture the sound from the field of the recording. Then we use the opposite type of transducers to play the captured sound through the speakers. Thus we transform the acoustic signal into electricity to be able to operate with it. This is important because we can not capture the sound vibrations, so we need a medium. And this medium is the electricity.      But the electricity preserves only … Read entire article »

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Lecture 3 part 2 – Digital representation of the sound

Lecture 3 part 2 – Digital representation of the sound

In the 80’s a significant step in the improvement  of the recording and reproducing of sound was made. The digital technology was born. The principle of the digital sound representation can be different, but the most common is the PCM (Pulse Code Modulation). In it the sound wave, which is continuous, is divided to frames, or, in the digital audio world, SAMPLES.     This process is called quantisation. The number of samples per second can be different, but usually it … Read entire article »

Filed under: digital audio, ESPOL

Лекция 4 – Цифрови stand-alone звукозаписни системи

Filed under: digital audio, Sound theory

Lecture 5 – Equalization – overview

Lecture 5 – Equalization – overview

Here is the presentation from the lesson about equalization … Read entire article »

Filed under: digital audio, ESPOL, Uncategorized

Lecture 6 – Dynamic processors

Lecture 6 – Dynamic processors

The dynamic processors are processors, which are sensitive to the dynamic range. Usually we can say that they don’t care about the frequency range and frequency bands, like the eq (there are exceptions, but we will not talk about them now). All the dynamic processor is detecting and working on, is the dynamic range. The 4 major types of dynamic processing are: Compressor; Limiter; Expander: Gate. The compressor and the limiter are devices, which are reducing the dynamic range. This is how … Read entire article »

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Lecture 6 – Reverberation

Lecture 6 – Reverberation

REVERBERATION   When we have a sound emitted in an enclosed space, upon arrival to the listener it comes with many discrete reflections from the surfaces of the room. These multiple reflections cause auditory impression of “prolongation” of the sound until the reverberation process died down. The amount of reverberation generated by the surfaces of the hall is directly proportional to the magnitude and and inversely proportional to the sound absorption, which is carried out from its surface.     The acoustic … Read entire article »

Filed under: Sound theory

ACOUSTUCS – Part1

ACOUSTUCS – Part1

ACOUSTUCS – Part 1   Propagation of sound. Characterictics of sound waves. Wavefront , acoustic beam. Period and wavelength. Frequency of the sound. Longitudinal and transverse waves. Speed of sound. https://www.youtube.com/watch?v=GkNJvZINSEY     As we know, the sound is the sensation caused by the vibration of the flexible body in agile environment. Parts of the agile environment transmit the vibrations through their mutual connection through intermolecular forces. The oscillation of every part of environment spread throughout the agile environment. Distribution of the periodic pressure variation on agile environment called … Read entire article »

Filed under: ESPOL, Sound theory

Acoustics Part 2

Acoustics Part 2

ACOUSTUCS – Part 2 PHASE CHARACTERISTICS OF SOUND   Initial phase of the signal   This is the position of the body from which it starts its oscillation. It is measured in degrees. If the body has begun fluctuation from equilibrium position, its initial phase is 0. If we deviate it in extremely positive attitude and let him go, the phase is 90. If two strings, membranes, pendulums or air columns begin their movement with a temporary delay to each other, we see a shift … Read entire article »

Filed under: Sound theory