Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Reexamination Certificate
2011-04-19
2011-04-19
Le, Lana N (Department: 2614)
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
C455S226100, C455S067110, C455S063100
Reexamination Certificate
active
07929933
ABSTRACT:
Variations in characteristics due to individual differences among RFs cause differences between estimated noise spectrum patterns and actually occurring noise characteristics, resulting in variations in noise suppression capabilities. A pattern table stores, in advance, a spectrum pattern of a noise component contained in an audio signal and which is determined for each electric field strength. A noise estimation unit reads out a noise spectrum pattern corresponding to an electric field strength and estimates a noise component contained in an audio signal. A level calculation unit uses a test signal corresponding to a predetermined electric field strength as input to calculate a noise level contained in an audio signal obtained by an FM demodulation unit. A correction value calculation unit uses the calculated noise level to correct the association between the noise spectrum pattern and the electric field strength. The noise estimation unit reads out a noise spectrum pattern according to the association corrected by the correction value calculation unit.
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Le Lana N
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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