Pulse or digital communications – Bandwidth reduction or expansion
Reexamination Certificate
2006-04-11
2006-04-11
Chin, Stephen (Department: 2634)
Pulse or digital communications
Bandwidth reduction or expansion
C375S316000, C375S271000, C455S205000
Reexamination Certificate
active
07027505
ABSTRACT:
A system and method for improving radio communication of frequency or phase modulated transmission and reception. Signal transmission is implemented by suppression of the upper and lower sidebands of a narrowband or very narrowband FM/PM signal from the transmission medium such that transmission is limited to the instantaneous frequency varied about the carrier frequency (center frequency). Suppression may be achieved by adding a bandpass filter between the modulator and the power amplifier of the narrowband FM transmitter. Upon receipt of the suppressed sideband signal, the received signal is converted to a first narrowband IF signal, and then the narrowband or very narrowband frequency deviation IF signal is expanded by frequency multiplication to generate a second wideband or very wideband IF signal. A discriminator may be used to convert the frequency-multiplied signal into a low frequency signal or audio signal for further processing. Through sideband suppression, bandwidth requirements are reduced without affecting sound quality and signal-to-noise ratio is improved.
REFERENCES:
patent: 4586174 (1986-04-01), Wong
patent: 5200835 (1993-04-01), Sakamoto
patent: 6205184 (2001-03-01), Al-Eidan
patent: 2002/0030877 (2002-03-01), Way et al.
patent: 0 720 315 (1999-08-01), None
Jacobson & Holman PLLC
Ware Cicely
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