Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2003-03-28
2008-11-04
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S229000, C375S316000, C375S350000
Reexamination Certificate
active
07447284
ABSTRACT:
One embodiment of the present invention relates to noise control of one or more signals. In one embodiment, impulsive-type noise events, such as multipath noise events or pops, may be detected and suppressed to reduce signal distortion. For example, in one embodiment related to a radio receiver (100), a predictor (436) having an adaptive filter (402) is used in combination with a fast attack slow decay mechanism (434) to provide noise control signals (352, 358) which may then be used to suppress noise events. In one embodiment, the fast attack slow decay mechanism includes applying a wide bandwidth filter at the onset of a noise event to quickly track variations in an error signal and applying a narrow wide bandwidth filter a peak of the noise event is detected in order to smooth variations in the error signal (410). This allows for improved psycho-acoustic perception. In one embodiment, the radio receiver is a mobile radio receiver.
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Li Junsong
Raj Raghu
Chiu Joanna G.
Fan Chieh M
Freescale Semiconductor Inc.
Hill Susan C.
Lee Siu M
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