Connecting the computer to some other technological realm involves some kind of specialized interface. For audio, a "Sound Card" is used. For telephones, an "Analog Telephone Adapter (ATA)". For video, Analog and ATSC tuner cards are available.

Note that these "Technology Transducers" provide much more than the simple "Signal transducer" role. Sound cards add mixing and switching features in addition to analog-to-digital and digital-to-analog conversion. Video cards often have digital compression and encoding features in addition to VHF/UHF radio receivers and analog-to-digital conversion.

Today's story: Operations systems

sound cards

A/D, D/A, full-duplex, mixers, digitizer input selection, I/O

telephone cards

zapata interface, TDM trunking, ATA, SIP, IAX, PBX

video cards

analog TV, MPEG encoding, DTV, Set-top computing

software radio

sound card redux, USB A/D D/A high speed conversion, RF block converters