Audio coding systems compress signals to fit limited channels and storage

Evidence

Many of the advances in the distribution of audio material via film, DVD, television and the Internet, and even on DVD-Audio or Super Audio CD (SA-CD) have been made possible because of developments in audio coding systems. Audio coding systems are methods that reduce the overall data rate of the audio signal so that it may be transmitted via a limited data rate channel, such as the Internet, or stored in a data limited storage medium, like a DVD. In all cases the ability to reduce the data rate is essential for the system. There are two types of audio coding system: n Lossless audio coding systems: In these systems the data rate, or data quantity, is reduced but in such a way that no information is lost. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2572

Audio coding systems are methods that reduce the overall data rate of the audio signal so that it may be transmitted via a limited-data-rate channel, such as the Internet, or stored in a data limited storage medium, like a DVD. In all cases, the ability to reduce the data rate is essential for the system. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2578

Categorization

• DEFINE: Defines audio coding as data-rate reduction enabling modern audio distribution — foundational concept for the applied-psychoacoustics section.
• corroborated: 2 independent passages support this claim — David Howard, Jamie Angus, coustics and Psychoacoustics, 2572; David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2578