Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2006-01-31
2006-01-31
Nguyen, Simon (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S234100, C455S239100, C455S250100, C375S345000
Reexamination Certificate
active
06993305
ABSTRACT:
An AM receiver includes an audio filter that is configured to selectively narrow the audio bandwidth of the demodulated signal when a signal with a low signal-to-noise ratio is received. By suitably bandpass-filtering the signal, for example, to 200–5000 Hertz, the intelligibility of the demodulated audio signal is not substantially reduced, whereas this bandpass-filtering substantially suppresses the audio noise that is typically found to be most annoying when listening to an full-bandwidth audio signal with a low signal-to-noise ratio. Optionally, the audio filter also provides gain to the bandpass-filtered signal.
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McDermott, Esq. R. M.
Nguyen Simon
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