Radio receiver for demodulating both wideband and narrowband modulated signals
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United States of America Patent
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Apr 28, 1998
Issued Date -
N/A
app pub date -
Feb 28, 1997
filing date -
Oct 14, 1993
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Abstract
A radio receiver is disclosed for demodulating both wideband and narrowband frequency-modulated signals. The radio receiver improves the capacity of a system by reducing the bandwidth occupancy of analog frequency modulation systems. The radio receiver comprises a superheterodyne frequency device which converts the received frequency-modulated signal to a fixed intermediate frequency signal. A filter then filters the intermediate frequency signal with a first filter bandwidth adapted to a wideband frequency-modulated signal. The filtered wideband frequency-modulated signal is demodulated in a demodulator using a frequency discriminator. The intermediate frequency signal is then filtered using a second and third filter bandwidth adapted to a narrowband frequency-modulated signal. Finally, the further-filtered intermediate frequency signal is demodulated using a frequency discriminator.
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