Multiplex communications – Wide area network – Packet switching
Patent
1988-07-01
1989-07-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
333173, H04B 150
Patent
active
048520802
ABSTRACT:
In the high-group passband filter of an analog front-end circuit for full-duplex communications, switches enable an all-pass filter, a high-pass filter, and a low-pass filter to be connected in the optimum series for different band assignments, thus improving S/N performance.
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patent: 4558292 (1985-12-01), Sasaki et al.
Roubik Gregorian, Switched-Capacitor Filter Design Using Cascaded Sections, Jun. 1980, pp. 515-521, IEEE Transactions on Circuits and Systems.
R. W. Bigg, A New Modem for the Patel 2412 Service: Patel Modem, No. 12B, Post Off. Electr. Eng. J. (GB), vol. 70, pt 3, pp. 185-193.
IEEE Journal of Solid-State Circuits, vol. SC-21, No. 6, 12/86; "An Analog Front End for 2400-bit/s Split-Band Full-Duplex Modems", Yamamoto et al.
Ohtake Hisao
Yamamoto Kazushige
Jorgenson Frederick R.
OKI Electric Industry Co., Ltd.
Olms Douglas W.
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