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Set-top box with out-of band modem and cable modem
| Details |
Inventors: Ina, Norihisa;
Assignee: Sony Corporation (Tokyo, JP); Sony Electronics Inc. (Park Ridge, NJ)
Primary Examiner: Srivastava; Vivek
Assistant Examiner: Sheleheda; James
Attorney, Agent or Firm: Miller Patent Services, Miller; Jerry A.
A circuit arrangement for combining signals in a cable set-top box or television receiver. An out-of-band upstream amplifier and a cable modem upstream amplifier have their outputs combined at a combiner before being passed to the cable through a diplexer. The output of the diplexer provides incoming signals for an in-band tuner, a cable modem tuner and an out-of-band tuner that can be passed through a low noise amplifier before passing through a three-way splitter to divide the signals to each of the tuners. |
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DETAILED DESCRIPTION What is claimed is: 1.
An apparatus for combining upstream and downstream signals in a television set-top box, comprising: a cable interface interfacing to a cable television cable; a diplexer coupled to the television cable interface at a diplexer port, the diplexer having a diplexer input for receiving upstream signals and a diplexer output for providing downstream signals; a combiner having an output coupled to the diplexer input, and having a first input receiving a first output from a first upstream modem output, and having a second input receiving a second output from a second upstream modem output; wherein the first upstream modem output comprises an out-of-band modem output, and wherein the second upstream modem output comprises a cable modem output; a splitter having an input coupled to the diplexer output, and having a first output providing signals to a first tuner, and having a second output providing signals to a second tuner, and having a third output providing signals to a third tuner, wherein the first tuner comprises an inband tuner for tuning television programming, wherein the second tuner comprises an out-of-band tuner for tuning out-of-band data, and wherein the third tuner comprises a cable modem tuner; and a wideband low noise amplifier disposed between the diplexer output and the splitter input.
2.
The apparatus according to claim 1, wherein the splitter comprises a transformer having a primary winding and a secondary winding, with center taps for both the primary winding and the secondary winding, the center taps being connected together and grounded through a capacitor, and wherein the primary winding serves as the splitter input and the secondary winding serves as the splitter outputs, with a first end of the primary winding being grounded and a first end of the secondary winding serving as the first output and the second end of the secondary winding serving as the second output.
3.
The apparatus according to claim 2, further comprising a filter disposed between the amplifier and the splitter
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Cell Phones 
