Electroacoustics is the bridge between electricity and sound. It studies how an electrical signal is converted into audible sound (as in loudspeakers), and how sound is transformed into an electrical signal (as in microphones). Thanks to these principles, it is possible to design systems that amplify, process, and transmit audio in a precise and controlled manner.
In this section, you will discover the basic concepts behind this transformation, how it affects sound quality, and why understanding them is essential for correctly installing and adjusting equipment.
Every audible message begins as electricity, and every electrical impulse can become sound.
What is noise in audio systems?
Noise is any unwanted sound that mixes with the audio we want to hear. It can come from electrical equipment, interference, or the physical environment.
A good audio system minimizes noise so the message sounds clean. A well-designed public address system ensures that the broadcasted audio overcomes the noise and is clearly understood.
What is speech intelligibility?
It is the clarity with which a voice is understood through a sound system. It’s not about volume, but about making each word recognizable and not muddled by noise or echo.
It is crucial in emergency public address systems: if the message isn’t understood, it’s useless.
What does distortion mean in sound?
It is the difference between the original sound and what is actually heard. It can occur due to excessive volume, poor equipment quality, or interference.
When a speaker distorts, the sound becomes altered and loses clarity.
What is sensitivity in audio equipment?
Sensitivity indicates how loud a loudspeaker sounds with a given input signal. It is measured in decibels (dB): higher sensitivity = more volume with less energy.
A sensitive loudspeaker doesn’t need much power to sound loud (as is the case with exponential loudspeakers or acoustic projectors).
What does “frequency response” mean in a loudspeaker or microphone?
It is the range of sounds (from low to high frequencies) that a device can reproduce or capture. The wider and more uniform the frequency response, the more natural and complete the sound will be.
It’s like the spectrum a loudspeaker covers: if it responds well to many frequencies, the audio will be more faithful.
What is a transducer in the world of sound?
A transducer is a device that converts one form of energy into another. In sound, it typically transforms electrical energy into sound waves (as a loudspeaker does), or vice versa: it converts sound waves into electrical signals (as a microphone does).
It is the key component that lets us hear what comes out of a system... or record what we say.