Transcript PPTX
Balanced Audio, Speakers, and Amplifiers Created by: Sarah Hutchens & Jacob Hanchett What is balanced audio? ● Method of minimizing unwanted noise from interference in audio cables. ● Uses an extra line: Hot line (positive) ○ Cold line (negative) ○ Earth line ○ How does balanced audio work? ● Two identical signals, which are opposite polarities, will cancel each other out. ● Cables used in these systems are designed to: ○ ○ carry two versions of the signals manipulate the polarities of these signals to eliminate noise Unbalanced Audio ● Use only two lines to transmit the audio signal ○ ○ Hot line (which carries the signal) Earth line ● Common in short cables ● Common in less professional applications ● Any single-pin connector used for audio is unbalanced Speakers ● Speakers are the final translation machine ● Voltage and amplitude change the sound ● Takes the amplified electrical signal and translates it back into physical vibrations, by the drivers, to create sound waves Parts of a speaker Types of Drivers ● Woofers ○ Biggest drivers ○ Produce low frequency sounds Types of Drivers Cont. ● Midrange ○ Produce a range of frequencies in the middle of the sound spectrum Types of Drivers Cont. ● Tweeter ○ ○ Smallest driver Produce the highest frequencies Amplifiers ● Amplifies the strength of the electrical signal ● Signal is sent to the speaker ● Changes alternating current (AC) into direct current (DC) to work properly ● The electrical signal from the microphone is not strong enough to make the speakers work Amplifiers Cont. ● Transistors ○ Heart of most amps ○ Uses conductors and semiconductors ○ It boosts the voltage Amplifier Circuit Summary ● Use the correct wires for the best sound and safety of the equipment ● Speakers change the electrical signal back into sound by vibrating the drivers ● Amplifiers amplify the strength of electricity Bibliography ● www.mediacollege.com ● http://www.howstuffworks.com/amplifier.htm ● http://www.howstuffworks.com/speaker.htm Thanks for listening! Hope you learned a little something about balanced/unbalanced audio, speakers and amplifiers!