R

A frequency that is higher than the audio frequencies but below the infrared frequencies, usually above 20 KHz.

The "Reach" of a satellite system is the number of Households who are receiving at least one channel of that satellite system.

Compression is based on the principle that all TV pictures contain redundant information and therefore the quantity of data in a digitised signal can be reduced. Redundancy may be: "spatial" - the correlation between adjacent picture elements within the TV frame is used to reduce the data (intraframe compression); "temporal" - only the differences between adjacent frames are processed and encoded (interframe compression); or "statistical" - regularly repeated and therefore predictable information is not transmitted.

Compression is based on the principle that all TV pictures contain redundant information and therefore the quantity of data in a digitised signal can be reduced. Redundancy may be: "spatial" - the correlation between adjacent picture elements within the TV frame is used to reduce the data (intraframe compression); "temporal" - only the differences between adjacent frames are processed and encoded (interframe compression); or "statistical" - regularly repeated and therefore predictable information is not transmitted.

The transmission path issued from the end user and reaching the service provider.