Glossary - A Practical Guide to Video and Audio Compression - page 739

Topic Description

T.120 A standard that describes data conferencing. It includes

references to T.121, T.122, T.123, T.124, T.126, and T.127.

TCP/IP Transmission Control Protocol/Internetworking Protocol

describes the message format and connection mechanisms
that make the Internet possible. It is built on top of UDP. It
contains ack/nak (acknowledge/negative acknowledge)
protocols to ensure that all packets have arrived It does this at
the expense of timeliness.

Theora The open-source video-compression counterpart to the Ogg

Vorbis encoder.

TiVo A company that developed the first widely available PVR

product. Their name is becoming synonymous with PVR
products in the same way that the word Xerox is often used to
describe any copy machine. Strictly speaking, you should not
describe something as a TiVo unless it is a TiVo-manufactured
PVR, and describing products by other manufacturers as 'TiVo
like' is also considered detrimental. These PVR devices are also
sometimes known as DVR devices, since they operate with
digitized video even when their I/O is analogue.

Transponder On a Digital Satellite system (DSat), the transport stream is

delivered one per transponder. Each transponder is quite
separate from the others.

Transport stream A stream that carries one or more video programs from the

broadcaster to the client.

Trigger Data messages embedded in streams can carry event-based

information to cause things to happen in the client device.

Triple play Video, telephony, and broadband services delivered via a single

cable. Also used in other contexts to describe TV receivers that
play VHS cassettes and DVDs.

Truespeech Truespeech is a codec used for low-bandwidth encoding of

speech (not music). It was created by the DSP Group.

TV-AF TV-Anytime Forum.

TV-Anytime A standard that describes the metadata required to make a

distributed PVR service work.

UDP Universal Datagram Protocol. This is a lower-level protocol

under TCP/IP that guarantees immediate transfer of data but
may lose some packets.

VC-1 The SMPTE standards work that is preparing Windows Media

Series 9 for ratification is known as VC-1.

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