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High-definition television (HDTV) in the United States was introduced in 1998 and has since become increasingly popular and dominant in the television market. Hundreds of HD channels are available in millions of homes and businesses both terrestrially and via subscription services such as satellite , cable and IPTV .
One television ratings point (Rtg or TVR) represents one percent of television households in the surveyed area in a given minute. In 2004, there were an estimated 109.6 million television households in the United States; one national ratings point represented 1,096,000 households for the 2004–05 season.
If 100,000 ad impressions are displayed on multiple episodes or TV stations for a defined population of 100,000 people, the total is 100 GRPs. However, total reach is not always 100%. If an average of 12% of the people view each episode of a television program, and an ad is placed on 5 episodes, then the campaign has 12 × 5 = 60 GRPs.
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For example, a signal (10101010) has 50% duty cycle, because the pulse remains high for 1/2 of the period or low for 1/2 of the period. Similarly, for pulse (10001000) the duty cycle will be 25% because the pulse remains high only for 1/4 of the period and remains low for 3/4 of the period.
In the United States, owned-and-operated television stations (frequently abbreviated as O&Os) constitute only a portion of their parent television networks ' station bodies, due to ownership limits imposed by the Federal Communications Commission (FCC). Currently, the total number of television stations owned by any company (including a ...