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US 7,120,546 B2Granted
Integrated spectrum analyzer for tuners
AssigneeTexas Instruments Incorporated
InventorsEli Zyss, Uri Garbi, Alon Elhanati
Life of this patent
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Abstract
A scheme to provide a spectral view of the signals present at the customer premises equipment by the network operator and includes a digital signal processor (DSP) or other signal processing apparatus integrated into a customer premises equipment (CPE) tuner in which the DSP or other signal processing apparatus is operational to perform a spectral analysis.
Claims14
An integrated spectrum analysis system comprising:
- a programmable down converter operational to reduce an input signal frequency to a desired frequency;
- a low pass filter operational to filter the reduced frequency input signal and generate a filtered output signal at the desired frequency there from;
- a decimator operational to convert the filtered output signal at the desired frequency to a stream of digital samples at the same or lower rate than the desired frequency;
- a snapshot memory operational to selectively store data corresponding to the stream of digital samples at a lower frequency;
- and
- a digital signal processor (DSP) in communication with the snapshot memory via a data interface bus, wherein the DSP is operational to perform a spectrum analysis of the selectively stored data.
3 more elements
A method of performing spectrum analysis on a data communication input signal, the method comprising the steps of:
- providing a customer premises equipment having an integrated digital signal processor (DSP);
- shifting a data communication input signal frequency to a desired frequency;
- filtering the shifted frequency input signal and generating a filtered output signal at the desired frequency there from;
- converting the filtered output signal at the desired frequency to a stream of digital samples at the same or lower rate than the desired frequency;
- selectively storing a snapshot of the digital samples;
- communicating the stored digital samples to the integrated DSP via a data interface bus;
- and
- performing a spectrum analysis of the selectively stored digital samples via the integrated DSP.
5 more elements
An integrated spectrum analysis system comprising:
- means for programmably frequency converting an input signal frequency to a desired frequency;
- means for filtering the desired frequency input signal and generating a filtered output signal at the desired frequency there from;
- means for converting the filtered output signal at the desired frequency to a stream of digital samples at the same or lower rate than the desired frequency;
- means for selectively storing a snapshot of the stream of digital samples at the same or lower rate than the desired frequency;
- and
- means for performing a spectrum analysis of the selectively stored samples without use of specialized portable testing equipment.
3 more elements
Dependencies are inferred from the claim text.