Methods And Systems For Rapid Detection Of Digital Radio Signals
First Claim
1. A receiver system for detecting digital content in a radio frequency (RF) channel, comprising:
- front-end circuitry configured to receive radio frequency (RF) signals and to output signals associated with a channel within the RF signals;
analog-to-digital conversion (ADC) circuitry configured to receive the output signals and to output digital samples having a real component (I) and an imaginary component (Q);
complex magnitude determination circuitry configured to receive the digital samples and to generate complex magnitudes for the digital samples;
sliding window averaging filter circuitry configured to subsample the complex magnitudes, to apply a sliding window average to the subsampled complex magnitudes, and to output subsampled magnitude values; and
shape detection circuitry configured to utilize subsampled magnitude values over a plurality of symbol times to determine if digital content is present within the channel having a digital content shaping function, the symbol time and the digital content shaping function being associated with digital content to be detected.
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Abstract
Systems and methods are disclosed for rapid detection of digital content within received radio frequency (RF) signals. The disclosed embodiments digitize received RF signals and apply a sliding window average to subsampled complex magnitudes for the digital samples to generate subsampled magnitude values. The subsampled magnitude values are then collected over a small number of symbols for the digital content, and the results are analyzed to determine whether or not digital content is present with the received signals. For example, multi-symbol histograms and magnitude ratios determined over multiple symbols can then be utilized to make the determination of whether digital content is present in the received signals. The resulting detection determination can be utilized further to control operations of systems utilizing the disclosed embodiments. The disclosed embodiments can be used, for example, to detect the presence of HD (High Definition) Radio digital content within broadcast channels.
19 Citations
30 Claims
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1. A receiver system for detecting digital content in a radio frequency (RF) channel, comprising:
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front-end circuitry configured to receive radio frequency (RF) signals and to output signals associated with a channel within the RF signals; analog-to-digital conversion (ADC) circuitry configured to receive the output signals and to output digital samples having a real component (I) and an imaginary component (Q); complex magnitude determination circuitry configured to receive the digital samples and to generate complex magnitudes for the digital samples; sliding window averaging filter circuitry configured to subsample the complex magnitudes, to apply a sliding window average to the subsampled complex magnitudes, and to output subsampled magnitude values; and shape detection circuitry configured to utilize subsampled magnitude values over a plurality of symbol times to determine if digital content is present within the channel having a digital content shaping function, the symbol time and the digital content shaping function being associated with digital content to be detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for detecting digital content in a radio frequency (RF) channel, comprising:
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receiving radio frequency (RF) signals; digitizing signals associated with a channel within the RF signals to generate digital samples having a real component (I) and an imaginary component (Q); determining complex magnitudes for the digital samples; applying a sliding window averaging filter to subsample the complex magnitudes, to average the subsampled complex magnitudes, and to generate subsampled magnitude values; utilizing the subsampled magnitude values over a plurality of symbol times to determine if digital content is present within the channel having a digital content shaping function, the symbol time and the digital content shaping function being associated with digital content to be detected; and outputting a detection signal indicating whether or not digital content is present. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification