| 摘要 |
A method and apparatus for providing direct conversion of baseband digital symbols to a desired frequency (e.g., IF or RF) without the need for analog up conversion. The apparatus of the present invention is a VSB modulator comprising a complex frequency shifter, an interpolation filter, an optional pilot inserter, a DDS quadrature modulator and an optional image rejector and DAC compensator. The architecture of the present VSB modulator can be implemented using digital integrated circuit technologies, thereby significantly reducing the cost of devices that require a VSB modulator.
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