System for transmitting data simultaneously with audio
First Claim
1. An FM broadcasting system comprising:
- main transmission means for transmitting a main program on an FM channel carrier;
auxiliary transmission means associated with said main transmission means for transmitting an auxiliary audio program on subcarriers of the FM channel carrier;
data means associated with said auxiliary transmission means for adding a data signal to the auxiliary audio program so that said auxiliary transmission means can simultaneously transmit the data signal and the auxiliary audio program on the same subcarriers of the FM channel carrier without interruption of the transmission of either the data signal or the auxiliary audio program; and
receiving means for receiving at least one of the main program, the auxiliary audio program and the data signal.
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Accused Products
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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Citations
24 Claims
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1. An FM broadcasting system comprising:
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main transmission means for transmitting a main program on an FM channel carrier; auxiliary transmission means associated with said main transmission means for transmitting an auxiliary audio program on subcarriers of the FM channel carrier; data means associated with said auxiliary transmission means for adding a data signal to the auxiliary audio program so that said auxiliary transmission means can simultaneously transmit the data signal and the auxiliary audio program on the same subcarriers of the FM channel carrier without interruption of the transmission of either the data signal or the auxiliary audio program; and receiving means for receiving at least one of the main program, the auxiliary audio program and the data signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An FM broadcasting system comprising:
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main transmission means for transmitting a main program on an FM channel carrier; auxiliary transmission means associated with said main transmission means for transmitting an auxiliary audio program on subcarriers of the FM channel carrier; - View Dependent Claims (9, 10)
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8. data means associated with said auxiliary transmission means for adding a binary digital signal in serial form with a predetermined bit rate to the auxiliary audio program so that said auxiliary transmission means can simultaneously transmit the binary digital signal and the auxiliary audio program on the same subcarriers of the FM channel carrier, said data means comprising oscillation means for generating a data reference signal, modulation means connected to said oscillation means for generating a modulated data reference signal by modulating the data reference signal in accordance with the binary digital signal, wherein said modulation means modulates the phase of the data reference signal to indicate the binary value of the binary digital signal by the phase transition of the modulated data reference signal, data clock means for generating a clock signal having a cycle corresponding to the bit rate of the binary digital signal and analog switch means having an input connected to said data clock means and a control gate coupled to the binary digital signal for selectively blocking individual cycles of the clock signal in response to the binary values of the binary digital signal, the output of said analog switch means being connected to said modulation means;
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receiving means for receiving at least one of the main program, the auxiliary audio program and the data signal.
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11. An FM broadcasting system comprising:
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main transmission means for transmitting a main program on an FM channel carrier; auxiliary transmission means associated with said main transmission means for transmitting an auxiliary audio program on subcarriers of the FM channel carrier; data means associated with said auxiliary transmission means for adding a binary digital signal in a parallel form with a predetermined bit rate to the auxiliary audio program so that said auxiliary transmission means can simultaneously transmit the binary digital signal and the auxiliary audio program on the same subcarriers of the FM channel carrier, said data means comprising oscillation means for generating a data reference signal, modulation means connected to said oscillation means for generating a modulated data reference signal by modulating the data reference signal in accordance with the binary digital signal, wherein said modulation means modulates the phase of the data reference signal to indicate the binary value of the binary digital signal by the phase transition of the modulated data reference signal, data clock means for generating a clock signal having a cycle corresponding to the bit rate of the binary digital signal, converter means coupled to receive the binary digital signal for converting the binary digital signal from serial to parallel form and analog switch means connected to said data clock means and a control gate coupled to said converter means for selectively blocking individual cycles of the clock signal in response to the binary values of the binary digital signal, the output of said analog switch means being connected to said modulation means; and receiving means for receiving at least one of the main program, the auxiliary audio program and the data signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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12. In a broadcasting system for transmitting a main program on a channel carrier and an auxiliary audio program such as background music on subcarriers of the channel carrier, data transmission means for transmitting a data signal simultaneously with the auxiliary audio program on the same subcarriers of the channel carrier without interruption of the transmission of either the data signal or the auxiliary audio program.
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20. In a broadcasting system for transmitting a main program on a channel carrier and an auxiliary audio program such as background music on subcarriers on the channel carrier, data transmission means for transmitting a data signal simultaneously with the auxiliary audio program on the same subcarriers of the channel carrier, said data transmission means comprising reference means for generating a data reference signal and modulation means for modulating the data reference signal in accordance with the data signal, the data signal being a binary digital signal and said modulation means comprising a phase/amplitude modulator for modulating the phase and amplitude of the data reference signal in accordance with the data signal, wherein the binary values of the binary digital signal are represented by the phase transition of the modulated data reference signal, said data transmission means further comprising:
amplitude adjusting means for adjusting the amplitude of the modulated data reference signal in relation to the amplitude of a corresponding frequency range of the auxiliary audio program and summing means having one input connected to said amplitude adjusting means for summing the amplitude adjusted signal generated by said amplitude adjusting means and another input connected to receive the auxiliary audio program, wherein said summing means generates an output signal which modulates the subcarriers of the channel carrier. - View Dependent Claims (22)
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21. In an FM broadcasting system for transmitting a main program on an FM channel carrier and an auxiliary audio program such as background music on subcarriers of the FM channel carrier, the method comprising the steps of:
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combining a data signal with the auxiliary audio program by adding the data signal to the auxiliary audio program; and transmitting the combined data signal and auxiliary audio program simultaneously on the same subcarriers of the FM channel carrier without interruption of the transmission of either the data signal or the auxiliary audio program.
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23. In an FM broadcasting system for transmitting a main program on an FM channel carrier and an auxiliary audio program such as background music on subcarriers of the FM channel carrier, the method comprising the steps of:
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generating a data reference signal; modulating the phase of the data reference signal in accordance with the binary values of a binary digital signal to generate a modulated data reference signal; adjusting the amplitude of the modulated data reference signal in relation to the amplitude of a corresponding frequency range of the auxiliary audio program; combining the binary digital signal with the auxiliary audio program by adding the adjusted modulated data reference signal to the auxiliary audio program; and
;transmitting the combined binary digital signal and auxiliary audio program simultaneously on the same subcarriers of the FM channel carrier.
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24. An FM broadcasting system comprising:
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main transmission means for transmitting a main program on an FM channel carrier; auxiliary transmission means associated with said main transmission means for transmitting an auxiliary audio program on subcarriers of the FM channel carrier; data means associated with said auxiliary transmission means for adding a binary digital signal to the auxiliary audio program so that said auxiliary transmission means can simultaneously transmit the binary digital signal and the auxiliary audio program on the same subcarriers of the FM channel carrier, said data means comprising oscillation means for generating a data reference signal, modulation means connected to said oscillation means for generating a modulated data reference signal by modulating the data reference signal in accordance with the binary digital signal, wherein said modulation means modulates the phase of the data reference signal to indicate the binary value of the binary digital signal by the phase transition of the modulated data reference signal, amplitude adjusting means coupled to said modulation means for adjusting the amplitude of the modulated data reference signal in response to the amplitude of a corresponding frequency band of the auxiliary audio program and linear summing means having one input connected to said amplitude adjusting means and another input connected to receive the auxiliary audio program for linearly summing the auxiliary audio program and the modulated data reference signal is transmitted by said auxiliary transmission means over the subcarrier of the FM channel carrier; and receiving means for receiving at least one of the main program, the auxiliary audio program and the binary digital signal.
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Specification