A wireless receiver includes a down converter module operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module having a filter bandwidth and fed by said down converter module, and a measurement module operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module responsive to said measurement module to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

Portable communication device and method for mitigating interference. One example portable communication device includes a frequency-modulated (FM) communication subsystem, a cellular communication subsystem, a first electronic processor, and a second electronic processor. The FM communication subsystem includes an FM modem and at least one FM antenna. The cellular communication subsystem includes a plurality of cellular antennas, a plurality of antenna tuners, and a cellular modem. The first electronic processor is configured to generate an alert signal responsive to detecting one of an audio signal reception by the FM communication subsystem and an audio signal transmission by the FM communication subsystem. The second electronic processor is configured to receive the alert signal from the first electronic processor. The second electronic processor is also configured to responsively cause the cellular communication subsystem to set substantially constant impedances for the plurality of cellular antennas.

Portable communication device and method for mitigating interference. One example portable communication device includes a frequency-modulated (FM) communication subsystem, a cellular communication subsystem, a first electronic processor, and a second electronic processor. The FM communication subsystem includes an FM modem and at least one FM antenna. The cellular communication subsystem includes a plurality of cellular antennas, a plurality of antenna tuners, and a cellular modem. The first electronic processor is configured to generate an alert signal responsive to detecting one of an audio signal reception by the FM communication subsystem and an audio signal transmission by the FM communication subsystem. The second electronic processor is configured to receive the alert signal from the first electronic processor. The second electronic processor is also configured to responsively cause the cellular communication subsystem to set substantially constant impedances for the plurality of cellular antennas.

A wireless receiver (10) includes a down converter module (210) operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module (200) having a filter bandwidth and fed by said down converter module (210), and a measurement module (295) operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module (200) responsive to said measurement module (295) to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module (200) is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

A wireless receiver (10) includes a down converter module (210) operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module (200) having a filter bandwidth and fed by said down converter module (210), and a measurement module (295) operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module (200) responsive to said measurement module (295) to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module (200) is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

A receiving device includes: a receiver which receives a broadcast signal including an audio signal and obtains a baseband signal of a received signal; a demodulator which obtains the audio signal by demodulating the baseband signal; a middle frequency range detector which detects a signal level of a middle frequency component in a frequency range of the baseband signal; a high frequency range detector which detects a signal level of a high frequency component in the frequency range of the baseband signal; and a processing circuit which sets an effect amount of high-cut processing based on a level difference between the signal level of the middle frequency component and the signal level of the high frequency component. The receiving device further includes a high-cut filtering device which performs the high-cut processing on the audio signal in accordance with a set value of the effect amount.

A receiving device includes: a receiver which receives a broadcast signal including an audio signal and obtains a baseband signal of a received signal; a demodulator which obtains the audio signal by demodulating the baseband signal; a middle frequency range detector which detects a signal level of a middle frequency component in a frequency range of the baseband signal; a high frequency range detector which detects a signal level of a high frequency component in the frequency range of the baseband signal; and a processing circuit which sets an effect amount of high-cut processing based on a level difference between the signal level of the middle frequency component and the signal level of the high frequency component. The receiving device further includes a high-cut filtering device which performs the high-cut processing on the audio signal in accordance with a set value of the effect amount.

A receiving device includes: a receiver which receives a broadcast signal including an audio signal and obtains a baseband signal of a received signal; a demodulator which obtains the audio signal by demodulating the baseband signal; a middle frequency range detector which detects a signal level of a middle frequency component in a frequency range of the baseband signal; a high frequency range detector which detects a signal level of a high frequency component in the frequency range of the baseband signal; and a processing circuit which sets an effect amount of high-cut processing based on a level difference between the signal level of the middle frequency component and the signal level of the high frequency component. The receiving device further includes a high-cut filtering device which performs the high-cut processing on the audio signal in accordance with a set value of the effect amount.

A receiving device includes: a receiver which receives a broadcast signal including an audio signal and obtains a baseband signal of a received signal; a demodulator which obtains the audio signal by demodulating the baseband signal; a middle frequency range detector which detects a signal level of a middle frequency component in a frequency range of the baseband signal; a high frequency range detector which detects a signal level of a high frequency component in the frequency range of the baseband signal; and a processing circuit which sets an effect amount of high-cut processing based on a level difference between the signal level of the middle frequency component and the signal level of the high frequency component. The receiving device further includes a high-cut filtering device which performs the high-cut processing on the audio signal in accordance with a set value of the effect amount.

A communications device includes aspects for improving reception of transmissions with first-adjacent co-channel interference signals corresponding to digitally-modulated side-bands of in-band on-channel (IBOC) broadcasted signals. The communications device may include a radio frequency (RF) signal-reception circuit including two RF-signal paths driven in response to signals received via at least two respective antennas, and configured to respond to signals carried in the respective RF-signal paths by providing pre-processed RF output signals. The communications device may further include a beam-forming circuit driven in response to signals received at the at least two respective antennas and configured and arranged to facilitate first-adjacent interference cancellation (FAC). The communications device can also include an interference-cancelling circuit configured and arranged to reduce the first-adjacent co-channel interference signals by combining a beam-forming output signal provided by the beam-forming circuit with the pre-processed RF output signals as part of a maximum ratio combining (MRC) process.