Removing Impulsive Noise In A Radio
AssigneeSilicon Laboratories Inc.
InventorsJavier Elenes, Dana Taipale, Alex Hakkola
Life of this patent
Estimating the term…
Abstract
In one example, an apparatus includes: a delay unit to delay a demodulated signal obtained from an input radio frequency (RF) frequency modulation (FM) signal; a filter to filter the demodulated signal and output a filtered demodulated signal; an impulse detection circuit to receive the filtered demodulated signal and detect presence of an impulse in the demodulated signal; and an impulse removal circuit to remove the detected impulse from the demodulated signal.
Claims19
An apparatus comprising:
- a delay unit to delay a demodulated signal obtained from an input radio frequency (RF) frequency modulation (FM) signal;
- a filter to filter the demodulated signal and output a filtered demodulated signal;
- an impulse detection circuit to receive the filtered demodulated signal and detect presence of an impulse in the demodulated signal;
- and
- an impulse removal circuit to remove the detected impulse from the demodulated signal;
- wherein the delay unit comprises:
- a plurality of delay elements to receive, delay and output a sample of the demodulated signal;
- and
- a plurality of selectors controllable to substitute a sample output from the filter for a sample of the demodulated signal, responsive to detection of the impulse.
9-10. (canceled)
A non-transitory computer readable medium including instructions that when executed enable a system to:
- obtain, in a first filter of a receiver, a first filter sum of a plurality of phase samples of an incoming frequency modulation (FM) signal;
- obtain, in a second filter of the receiver, a second filter value based on the first filter sum and a selected phase sample of the plurality of phase samples;
- determine, in an impulse detection circuit of the receiver, whether the second filter value exceeds a threshold value;
- and
- responsive to a determination that the second filter value exceeds the threshold value, replace one or more selected phase samples of the plurality of phase samples with the first filter sum.
A system comprising:
- a receiver to receive and process a frequency modulation (FM) signal, the receiver comprising:
- a delay circuit including a plurality of delay units to delay a plurality of phase samples;
- a filter to filter at least some of the plurality of phase samples and generate a filter output;
- a detector to determine whether the FM signal includes impulsive noise, based at least in part on the filter output;
- and
- a control circuit to replace one or more of the plurality of phase samples within the delay circuit with the filter output if the detector determines that the FM signal includes the impulsive noise, to remove at least some of the impulsive noise from the FM signal;
- wherein the delay circuit comprises:
- a plurality of delay elements to receive, delay and output a sample of the plurality of phase samples;
- and
- a plurality of selectors, wherein at least one of the plurality of selectors is controllable to substitute the filter output for a sample of the plurality of phase samples, responsive to detection of the impulsive noise.
(canceled)
Dependencies are inferred from the claim text.