Television captioning system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 12, 1982
Grant Date -
N/A
app pub date -
Aug 24, 1979
filing date -
Aug 24, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Captioning of television presentations is achieved by transmitting digital data superimposed on the normal FM sound signal by modulation of an ultrasonic subcarrier and receiving the digital data at a viewer's television receiver by picking up the ultrasonic signal from the television receiver's loudspeaker; the received digital data being demodulated and applied to the television receiver as readable alphanumeric captions.
First Claim
Family
International Classification(s)
Cited Art Landscape
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