Sound in multimedia systems

The Personal Computers are nowadays complex multimedia system. In the real everyday usage the sound card, or audio device, became the very important part of the system. It is used to record and reproduce the sound, whether the music is listened, the film is shown, or someone is talking with another party through the Internet, and so on. The most of modern PC motherboards already have audio device included on the board, but if someone wants to have better sound quality, then external sound cards/audio devices are used. It is possible to connect them through the slots on the board, like PCI interface, or via external ports, like USB. In this article the measuring methods, measuring results and their comparison are shown.