Controlling filter bandwidth based on blocking signals

摘要

In one embodiment, a method includes determining in a controller of a radio receiver whether at least one blocker signal is present in a blocking spectrum surrounding a desired radio channel. If no blocker signal is present, a channel filter of a signal processing path of the radio receiver may be controlled to operate at a first bandwidth. If a first blocker signal is present, the channel filter may be controlled to operate at a second bandwidth less than the first bandwidth. If the first blocker signal and a second blocker signal are present on opposing sides of the desired radio channel, the channel filter may be controlled to operate at a third bandwidth less than the second bandwidth, when a beating signal based on the first and second blocker signals is greater than a threshold level.

主权项

1. A system comprising:
a radio receiver to receive and process a radio frequency (RF) signal to output an audio signal, the radio receiver including:
an analog front end to receive the RF signal and downconvert the RF signal to a second frequency signal,an analog-to-digital converter (ADC) to convert the second frequency signal to a digitized signal, anda digital signal processor (DSP) to receive and demodulate the digitized signal and to provide a digital audio output, the DSP having a signal processing path including a channel filter having a bandwidth to be selectively controlled based at least in part on a frequency deviation signal and a beating signal associated with one or more blocker signals in a blocking spectrum adjacent to a desired signal channel; and a deviation estimator to estimate a peak frequency deviation of a first blocker signal of a first blocking channel adjacent to the desired signal channel.