An adaptive notch filter (ANF) module selectively filters a received wideband communication signal to eliminate narrowband interference that lies within the frequency spectrum of the wideband communication signal. To determine the presence of narrowband interference, the ANF module scans various known narrowband channels that lie within the frequency spectrum of the wideband communication signal and determines signal strengths for each of the narrowband channels. The signal strengths from the narrowband channels are compared to a threshold that is derived from the narrowband signal strengths. Narrowband channels having signal strengths that are greater than the threshold are determined to have interference.
CROSS REFERENCES TO RELATED APPLICATIONS
This is a continuation of U.S. application Ser. No. 09/827,641, filed Apr. 6, 2001, which is a continuation-in-part of U.S. application Ser. No. 09/301,477 filed on Apr. 28, 1999, and which claims the benefit of U.S. Provisional Application No. 60/195,387 filed on Apr. 7, 2000.
A distributed call progress tone detection system and method of operation thereof. In one embodiment, the system includes a switching partition having line interface modules, a call progress tone detector configured to perform call progress tone detection analysis, and an input-output distributor configured to employ a circuit to interconnect the call progress tone detector and a first of the line interface modules. The system further includes a main control unit configured to receive requests from an application over a packet network, transmit call and control processing commands to the switching partition, create an interconnection between the first of the line interface modules and a second of the line interface modules based on an indication generated by the call progress tone detector and notify the application of the interconnection.
A method of operating a distributed call progress tone detection system. In one embodiment, the method includes: (1) receiving requests from an application over said packet network and transmitting transmit call and control processing commands to a switching partition via a main control unit, (2) providing an interface to corresponding access nodes via line interface modules, (3) generating a call on a first of said line interface modules, (4) employing an input-output distributor to interconnect a call progress tone detector and said first of said line interface modules to allow said call progress tone detector to perform a call progress tone detection analysis and generate an indication thereof with respect to said first of said line interface modules and (5) creating an interconnection between said first of said line interface modules and a second of said line interface modules based on said indication via said input-output distributor and notifying said application of said interconnection.
A system and method are provided to reduce an interfering signal in a radar return signal for a frequency modulated continuous wave (FMCW) radar. Once the interfering signal is detected, an extent of the interfering signal is determined and the interfering signal is removed from the radar return signal. This allows the radar to detect a target in the presence of the interfering signal. The system and method can benefit any FMCW radar that is within the range of an interfering radar source (e.g. another FMCW radar, a police radar gun, a pulse radar, etc.) operating in the same frequency band as the FMCW radar.
