Method for transmitting multiple downstream CATV channels using a single upconverter
First Claim
1. A method of data transmission, comprising:
- generating a plurality of first digital signals;
digitally combining at least two of the first digital signals to create a first combined digital signal;
converting the first combined digital signal to a first analog signal, the first analog signal having a central frequency; and
shifting the central frequency of the first analog signal to create a transmittable analog signal having a frequency suited for transmission along a desired transmission medium.
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Accused Products
Abstract
A method and device (100, 200) for combining digital data signals, converting them to analog data signals, and transmitting the analog signals downstream via a single up converter (170, 270). The data transmission method includes generating a plurality of digital signals, digitally combining the digital signals, and converting the combined digital signal to an analog signal. The analog signal is up converted to a transmittable analog signal having a frequency suited for transmission along a particular transmission medium, and the transmittable analog signal is transmitted. The data transmission device (100, 200) includes a digital combiner circuit (180, 182, 282), a D/A converter (150, 152, 250), an up converter (170, 270), and an optional analog combiner circuit (190).
14 Citations
27 Claims
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1. A method of data transmission, comprising:
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generating a plurality of first digital signals;
digitally combining at least two of the first digital signals to create a first combined digital signal;
converting the first combined digital signal to a first analog signal, the first analog signal having a central frequency; and
shifting the central frequency of the first analog signal to create a transmittable analog signal having a frequency suited for transmission along a desired transmission medium. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A data transmission device, comprising:
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a first digital combiner circuit having a plurality of digital inputs and a combined digital output, the first digital combiner circuit being adapted to combine a plurality of digital data signals and create a first combined digital data signal;
a first digital-to-analog converter (DAC) having an input and an analog output, the first DAC input being coupled to the combined digital output of the first digital combiner circuit, the first DAC being adapted to convert the first combined digital data signal to a first analog data signal; and
an up converter coupled to the first DAC analog output adapted to up convert the first analog data signal in preparation for transmission. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A data transmission device, comprising:
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a first digital combiner circuit having a plurality of digital inputs and a combined digital output, the first digital combiner circuit being adapted to combine a plurality of digital data signals and create a first combined digital data signal;
a first digital-to-analog converter (DAC) having an input and an analog output, the input being coupled to the combined digital output of the first digital combiner circuit, the first DAC being adapted to convert the first combined digital data signal to a first analog data signal;
a second digital combiner circuit having a plurality of digital inputs and a combined digital output, the second digital combiner circuit being adapted to combine a plurality of digital data signals and create a second combined digital data signal;
a second digital-to-analog converter (DAC) having an input and an analog output, the input being coupled to the combined digital output of the second digital combiner circuit, the second DAC being adapted to convert the second combined digital data signal to a second analog data signal;
an analog combiner circuit having a plurality of inputs and an output, the first DAC output coupled to an input of the analog combiner circuit, the second DAC output coupled to an input of the analog combiner circuit, the analog combiner circuit adapted to combine the first and second analog data signals to create a combined analog signal, the combined analog signal having a central frequency; and
an up converter having an input coupled to the output of the analog combiner circuit, wherein the up converter is adapted to shift the central frequency of the combined analog signal in preparation for transmission. - View Dependent Claims (21, 22, 23, 24, 25, 27)
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26. A data transmission device comprising:
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means for combining a plurality of digital data signals to create a first combined digital data signal;
means for converting the first combined digital data signal to a first analog data signal, the first analog data signal having a central frequency; and
means for shifting the central frequency of the first analog signal to create a transmittable analog signal having a frequency suited for transmission along a desired transmission medium.
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Specification