TdT

TDT is an acronym that can refer to several unrelated concepts across broadcasting, genetics, and other fields. In broadcasting, TDT commonly denotes Digital Terrestrial Television, the delivery of digital television signals over terrestrial networks. Digital terrestrial television has replaced analog television in many regions and supports features such as high-definition broadcasts, digital compression, multiple channels, and program guides. The specific technical standards used vary by country, including DVB-T/DVB-T2 in many parts of Europe, ATSC in North America, ISDB-T in Japan and parts of South America, and DTMB in China, among others. The transition often involved spectrum reallocation and consumer equipment upgrades.

In genetics, TDT stands for Transmission Disequilibrium Test, a family-based statistical test used to detect association between genetic variants and diseases while controlling for population structure. The test assesses whether a given allele is transmitted from heterozygous parents to affected offspring more often than expected under Mendelian inheritance. A significant deviation in transmission patterns suggests the presence of linkage disequilibrium between the allele and a disease locus, providing evidence for genetic association.

TDT can have other, context-specific meanings in different disciplines and organizations. As with many acronyms, the intended meaning of TDT depends on the subject matter and setting in which it appears.