tags: mus-407 sound-reproduction-systems

Electrical Current

Electrical current is used to describe [sound waves] through changes in voltage over time.

There are two types: [direct current (DC)] and [alternating current (AC)]. AC and DC are not interchangeable

Alternating Current

AC flows by periodically reversing direction (60 Hz in the U.S).

Analog [audio signals] is represented using AC

• continuous voltage change is proportional (analogous) to continuous, acoustic pressure change

Direct Current

[Digital audio] signals are represented using DC

• DC current switches on and off, creating binary data for encoding sound wave information

DC flows in one direction along a circuit

Sources

• MUS 407 Sound Reproduction Systems