Radio receiver for demodulating both wideband and narrowband mod

Details Radio receiver for demodulating both wideband and narrowband mod Radio receiver for demodulating both wideband and narrowband mod

1997-02-28

1998-04-28

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455266, 455340, H04B 138, H04M 100

Patent

active

057458561

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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