Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2005-10-26
2010-06-01
Jackson, Blane J (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S226100
Reexamination Certificate
active
07729680
ABSTRACT:
A noise suppresser is provided which does not generate steady noise generated by a drop in the receiving field strength, pulse-type unsteady noise generated in a multipass environment and the like as well as musical noise due to excessive subtraction and the like.The noise suppresser (100) includes a field strength analysis unit (3) which analyzes change in a field strength d of a digital signal x, and a frame generation unit (1) which generates a frame made up of signal values accumulated within a range which does not exceed a predetermined threshold value when the analyzed field strength has changed and exceeds the predetermined threshold value. Further, the noise suppresser (100) includes a noise estimation unit (4) which estimates a noise pattern |N|n′ mixed in the input signal x when the field strength has changed and exceeds the predetermined threshold value, and a noise suppression unit (5) which suppresses the noise included in the generated frame using the estimated noise pattern.
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Jackson Blane J
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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