; and the G.711, G.722, G.723, G.728 and G.729 audio codecs. H.324 H.324 defines a multimedia communication terminal Video Communication: the Whole Picture that operates over POTS lines. It can incorporate H.261 or H.263 video encoding. The H.324 family includes H.223, for multiplexing, H.245 for control, T.120 for audiographics, and the V.90 modem specification. H.332 ITU Recommendation for large multipoint H.323 conferences (defined as "loosely coupled conferences"). H.450.1 ITU Recommendation that defines a generic functional protocol for the support of supplementary services in H.323. H.450.x ITU Recommendation that defines specific supplementary services to H.323 that leverage H.450.1. The switched 384 Kbps dialing standard as defined by an ITU-T Recommendation. The switched 1.544 Mbps dialing standard as defined by an ITU-T Recommendation. The switched 1.920 Mbps dialing standard as defined by an ITU-T Recommendation. handshake The electrical exchange of predetermined signals by devices in preparation of a connection. Once completed, the transmission begins. In video communications, handshake is a process by which codecs interoperate by seeking out a common algorithm. hard disk A sealed mass storage unit that allows archival of large amounts of data and smaller amounts of video or audio information. hardware The mechanical, magnetic and electronic components of a system. Examples are computers, codecs, terminals, and scanners. harmonic distortion A problem caused by the production of nonlinearities in a communications channel in which harmonics of the input frequencies appear in the output channel. harmonics In periodic waves, the component sine waves that are integer multiples-exponents-of the fundamental frequency. Glossary of Terms One of the two analog HDTV standards the EC's Council of Telecommunications Ministers promoted, and which was abandoned in favor of digital formats that were subsequently proposed. High Definition Television. TV display systems with approximately four times the resolution of s