Method of and system for transmitting two different messages on a carrier wave over a single transmission channel of predetermined bandwidth
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United States of America Patent
Stats
-
Dec 9, 1980
Grant Date -
N/A
app pub date -
Dec 19, 1978
filing date -
Dec 22, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a radio broadcoast channel, an additional message is superimposed on the normal message so as to be inaudible to the listener. To accomplish this, the additional message, consisting of digital signals, is modulated on a subcarrier lying in the ear-physiological masking range of the normal message. During breaks and very quiet intervals of the normal transmission, the signal transmission is interrupted because no masking occurs during those times. To make this possible, the transmission of the normal message is delayed by at least one signal length.
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