A68

A68 or A-68 may refer to:

Program and System Information Protocol

The Program and System Information Protocol (PSIP) is the MPEG and privately defined program-specific information originally defined by General Instrument for the DigiCipher 2 system and later extended for the ATSC digital television system for carrying metadata about each channel in the broadcast MPEG transport stream of a television station and for publishing information about television programs so that viewers can select what to watch by title and description.

What PSIP does

PSIP defines virtual channels and content ratings, as well as electronic program guides with titles and (optionally) descriptions to be decoded and displayed by the ATSC tuner.

PSIP can also send:

PSIP is defined in ATSC standard A/65, the most recent revision of which is A/65:2013, published in 2013. A/69 is a recommended practice for implementing PSIP in a television station.

A-68930

A-68930 is a synthetic compound that acts as a selective dopamine receptor D₁ partial agonist. It is orally active and has antidepressant and anorectic effects in animals, producing wakefulness and tachycardia, but without stimulant effects, instead producing sedation. The difference in effects between A-68930 and other D₁ agonists such as SKF-82958 may be due to their differing effects on the related D₅ receptor.

References