Addressable set-top box
The device in the customer's home that receives the commands sent from the cable office and converts the compressed digital signals to analog video and audio.
A continuously varying signal. Analog signals have an unlimited number of possible values ranging from very soft to very loud (amplitude) and at the same time, from very high to very low tones (frequency). Electrical signals are used to produce analog signals to carry voice and video information and are distinguished one from the other in terms of their frequency. These continuously varying voltages make up an analog voice or video signal. Contrast with DIGITAL.
A device used to descramble the analog signal and sends it to the modulator
Cable TV Penetration
Ratio of the number of customers to the total number of households with televisions that are passed by a cable system.
A cable consisting of a conducting outer metal tube insulated from a central conducting core, used for transmission of electronic signals.
Device that changes the frequency of a television signal. A home converter translates the signal from the frequencies at which they are sent over the cable to channels that the television set can pick up.
The source that receives a digital message and translates it back into an analog message. Converts scrambled TV signals into a viewable picture. Also known as an "descrambler" and "decryptor".
To restore a set of compressed information to its original state
The process of unscrambling an encrypted signal back into its original format
A device that demodulates a modulated wave back into its original state. In CATV systems, a television demodulator derives a baseband video signal from the modulated RF carrier.
Signal with a finite number of discrete values, usually two. Advantages over analog signal transmission and storage include better immunity to noise and ease of computer processing (including signal compression, error detection and correction, and multiplexing).
Reducing the storage space and/or transmission data rate necessary to store or transmit information represented in digital format. Common digital compression methods include the suppression of long strings of "1s" or "0s", delta transmission (that is, only sending information about the difference between signal sampled at two successive periods of time), and, for video applications, matching the characteristics of picture quality to the limitations of the human eye
Digital to Analog
Mechanical or electronic device used to convert converter discrete digital numbers to continuous analog signals
Direct Broadcast Satellite
Satellite that can transmit TV signals directly to individual homes.
Electronic Program Guide (EPG)
An on-screen navigational guide to facilitate selection of programming choices.
The source that changes an analog message into digital code and sends it.
Encryption is a process intended to ensure the security of message or television transmissions.
The antenna coverage pattern, which a satellite directs toward the earth. This defines the geographic area in which satellite signals can be received.
Fiber Optic Cable
Hair-thin continuous glass fibers that allow the transmission of laser-generated light signals with low loss of power or interference.
The physical quantities that vary to produce varying degrees of tone and pitch in a voice signal. The number of times an electromagnetic wave repeats an identical cycle in a unit of time (usually one second). One Hertz (Hz) is one cycle per second. A kHz (kilohertz) is one thousand cycles per second; a MHz (Megahertz) is one million cycles per second; a GHz (Gigahertz) is one billion cycles per second
A facility that contains satellite receivers, has antennas which receive signals from local TV studios, and sometimes has TV studios inside the facility which produce shows and send the signals to other locations by satellite or antenna. When a headend facility receives signals from a satellite, it retransmits the signals (analog and digital) at frequencies the cable plant can use.
Headend In The Sky (HITS)
A business venture aimed to provide services through digital compression. Digitally compressed video and audio are uplinked from the NDTC to one or more satellites and downlinked to cable television headends at various locations
Total number of homes that have the potential for being hooked up to a cable system.
Connectors, transformers and converter (if necessary) on the cable customer's television set.
The sending of a signal from a transmitter
Any of various electrical devices used to originate signals
A combination receiver and transmitter on a satellite that relays signals transmitted to it back to earth on a different frequency. For cable TV customers this means the number of channels available, which is directly related to the number of programming options. For example, a 3-transponder (or 3-pack) system has the space to accommodate 36 digital channels.
When the option on a project expires and the party holding that option chooses not to renew it, the project is said to be in turnaround and can move to another production company or simply go away