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Patexia Research

Patent 07342614 - Methods and apparatus for tuning signals > Claims

  • 1. A method for tuning a television signal, comprising acts of:nreceiving an analog signal from a signal source;translating the analog signal to a first frequency;filtering the analog signal to remove a portion of the analog signal;converting the analog signal to quadrature analog signals;converting the quadrature analog signals to digital signals;filtering the digital signals to substantially isolate a channel of interest;wherein the act of filtering comprises switching between an audio/video filter and a digital filter in response to a control signal.
    • 2. The method of claim 1, wherein the act of converting the quadrature analog signals to digital signals comprises inputting the quadrature analog signals to a sigma delta converter and outputting the digital signals from the sigma delta converter.
    • 3. The method of claim 1, wherein the act of filtering the digital signals comprises acts of:nprogramming parameters of a filter; andfiltering the digital signals with the filter.
      • 4. The method of claim 3, wherein the act of programming comprises programming the parameters based on a source of the analog signal.
        • 5. The method of claim 4, wherein the act of programming comprises programming a first set of parameters if the source is a terrestrial source and programming a second set of parameters if the source is a cable source.
      • 6. The method of claim 3, wherein the act of programming comprises programming the parameters based at least in part on whether the analog signal is encoded in digital or analog format.
      • 7. The method of claim 3, wherein the act of programming comprises programming the parameters based at least in part on a standard of the analog signal.
      • 8. The method of claim 3, wherein the act of programming requires adapting the parameter without user intervention.
      • 9. The method of claim 3, wherein the act of programming comprises programming a bandwidth of the filter.
      • 10. The method of claim 3, wherein the act of programming comprises programming a frequency characteristic of the filter.
    • 11. The method of claim 1, wherein the act of filtering generates filtered digital signals, and wherein the method further comprises an act of:noutputting the filtered digital signals from the tuner.
      • 12. The method of claim 11, wherein the act of outputting comprises outputting a real signal and an imaginary signal.
      • 13. The method of claim 11, wherein the act of outputting comprises outputting a signal that includes both audio and video data.
      • 14. The method of claim 11, wherein the act of outputting comprises outputting a single real signal.
    • 15. The method of claim 1, wherein the act of filtering generates filtered quadrature digital signals, and wherein the method further comprises an act of:noutputting the filtered quadrature digital signals from the tuner.
    • 16. The method of claim 1, wherein the act of filtering generates filtered digital signals, and wherein the method further comprises acts of:nconverting the filtered digital signals to analog signals; andoutputting the analog signals from the tuner.
    • 17. The method of claim 1, wherein the act of receiving an analog signal comprises receiving a broadband analog signal, and wherein the method further comprises an act of amplifying the broadband signal in response to a property of the broadband signal.
      • 18. The method of claim 17, wherein the act of amplifying the broadband signal comprises amplifying the broadband signal in response to a power level of the broadband signal.
    • 19. The method of claim 1, wherein the act of receiving an analog signal comprises receiving a television signal comprising data.
    • 21. The method of claim 1, further comprising an act of:nafter the act of filtering the analog signal, translating the analog signal at the first frequency to a second frequency.
      • 22. The method of claim 21, wherein:nthe act of translating the analog signal to a first frequency comprises upconverting the analog signal to a first frequency; andthe act of translating the analog signal to a second frequency comprises downconverting the analog signal to a second frequency.
  • 20. A method for tuning a television signal, comprising acts of:nreceiving an analog signal from a signal source;translating the analog signal to a first frequency;filtering the analog signal to remove a portion of the analog signal;converting the analog signal to quadrature analog signals;converting the quadrature analog signals to digital signals; andfiltering the digital signals to substantially isolate a channel of interest; andupconverting the filtered digital signals based on a standard of the analog signal.
  • 23. A television tuner, comprising:na front-end that receives an analog signal and outputs quadrature analog signals;an analog-to-digital converter that inputs the quadrature analog signals and outputs digital signals; anda filter adapted to substantially isolate a channel of interest of the digital signals, wherein the filter comprises:nan audio/video filter;a digital filter; anda switch coupled to the audio/video filter and digital filter, wherein the switch is switchable between the audio/video filter and digital filter in response to a control signal.
    • 24. The tuner of claim 23, wherein the analog-to-digital converter is a sigma delta converter.
    • 25. The tuner of claim 23, wherein the front-end, analog-to-digital converter, and filter are formed in a single module.
      • 26. The tuner of claim 25, wherein the front-end is formed on a first die of the module.
        • 27. The tuner of claim 26, wherein the analog-to-digital converter and filter are formed on a second die of the module.
    • 28. The tuner of claim 23, further comprising a mixer and a numerically controlled oscillator coupled between the analog-to-digital converter and the filter to translate the output of the analog-to-digital converter to baseband.
    • 29. The tuner of claim 23, wherein the filter further comprises a modulation detector that outputs the control signal.
    • 30. The tuner of claim 23, wherein the filter further comprises a carrier demodulator coupled at an input of the audio/video filter.
    • 31. The tuner of claim 23, wherein the filter is programmable.
      • 32. The tuner of claim 31, wherein the filter has at least one parameter that is responsive to a parameter control signal.
        • 33. The tuner of claim 32, wherein a bandwidth of the filter is responsive to the parameter control signal.
    • 34. The tuner of claim 23, wherein the filter is adaptive.
    • 35. The tuner of claim 23, further comprising:nfirst and second digital-to-analog converters coupled to the filter; andfirst and second analog tuner outputs respectively coupled to the first and second digital-to-analog converters.
      • 36. The tuner of claim 35, further comprising:na mixer coupled between the filter and the first and second digital-to-analog converters, wherein the mixer is coupled to an oscillator having an input to receive a frequency control signal.
      • 37. The tuner of claim 35, further comprising:nfirst and second digital outputs coupled to the filter.
    • 38. The tuner of claim 23, wherein:nthe front-end comprises an output for the quadrature analog signals;the analog-to-digital converter comprises an input for the quadrature analog signals; andthe output of the front-end is directly connected to the input of the analog-to-digital converter.
      • 39. The tuner of claim 38, wherein the quadrature analog signals comprise current signals.
  • 40. A television tuner, comprising:na front-end that receives an analog signal and outputs quadrature analog signals;an analog-to-digital converter that inputs the quadrature analog signals and outputs digital signals;a filter adapted to substantially isolate a channel of interest of the digital signals; anda mixer and a numerically controlled oscillator coupled between the analog-to-digital converter and the filter to translate the output of the analog-to-digital converter to baseband;wherein the numerically controlled oscillator has a step size of approximately 62.5 KHz or less.
  • 41. A television tuner, comprising:na front-end that receives an analog signal and outputs quadrature analog signals;an analog-to-digital converter that inputs the quadrature analog signals and outputs digital signals;a filter adapted to substantially isolate a channel of interest of the digital signals; anda mixer coupled between the filter and first and second digital outputs, wherein the mixer is coupled to an oscillator having an input to receive a frequency control signal.
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