System for transmitting data simultaneously with audio
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United States of America Patent
Stats
-
Apr 12, 1983
Grant Date -
N/A
app pub date -
Feb 2, 1979
filing date -
Feb 2, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An FM broadcasting system is disclosed for transmitting a data signal simultaneously with an auxiliary audio program on the same subcarriers of an FM transmission channel. The main program is transmitted on the FM transmission channel carrier and the auxiliary audio program, which may be background music, is transmitted on the subcarriers in a conventional manner. According to the present invention, the data signal, which is added to the auxiliary audio program, is a binary digital information signal. This binary digital information signal is used to generate a signal which modulates the phase and amplitude of a data reference signal. The resulting phase transition of the modulated data reference signal represents the binary value of the binary digital information signal. The amplitude of the modulated data reference signal then is adjusted in an automatic gain control amplifier relative to the amplitude of a corresponding frequency range of the auxiliary audio program. This amplitude adjusted signal is combined in a linear summing network with the auxiliary audio program and transmitted over the FM transmission channel. The receiver is capable of receiving one or more of the main program, the auxiliary audio program and the data signal.
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