Return-Path Data Lexicon: Drifting

by Jane Clarke, Mar 29, 2012, 7:24 AM

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CIMM is taking a pro-active role in advancing new media nomenclature and processes with both its Lexicon (terms and definitions associated with return-path data measurement) and Asset Identification Primer (glossary of asset terms). These documents form the basis of this column, which offers a common language for RPD nomenclature that can expedite the rollout of the data for its many industry applications.

How often do we look at a clock and realize that the time is slightly off? This occurs on occasion with computer clocks and set-top boxes (which are also computers to a certain extent). The cause of Clock Drift may have to do with the speed of processors, or service gaps or tuner mistakes. While next week we will review terms to correct this phenomenon, this week we list all the terms related to Drift in its many forms:

Clock Drift

See also: Drift, Clock Slippage, Frequency Drift

CIMM DEFINITION: When the built-in clock within the Set-Top Box or other device slowly deviates from the actual time.

Clock Slippage

See also: Clock Drift, Drift, Frequency Drift

CIMM DEFINITION: A term used to describe the situation in which clocks of separate electronic devices run at slightly different speeds. Clock slippage is the difference an individual clock departs from true time. (Source: Nielsen)

Drift

See also: Clock Drift, Clock Slippage, Frequency Drift

CIMM DEFINITION: When a tuner mistakenly tunes into another, therefore inaccurate frequency. There is also "clock drift" when the Set-Top Box (or computer) clock deviates from actual time

NOTE - How do we know when this occurs and then how to compensate in measurement

Frequency Drift

See: Clock Drift, Drift, Clock Slippage

CIMM DEFINITION: When a tuner mistakenly tunes into another, therefore inaccurate frequency. There is also "clock drift" when the Set-Top Box (or computer) clock deviates off from actual time.

Please refer to the CIMM Lexicon online at http://www.cimm-us.org/lexicon.htm for additional information on these and other terms.

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