Title: Frequency-division multiplexed signal transmission system

Abstract: A frequency division multiplexing system is disclosed having a plurality of individual modulators which modulate respective modulating signals onto respective carrier frequencies. The carrier frequencies are selected to have a frequency separation so that when modulated signals are combined, significant parts thereof do not overlap in frequency. The combined modulated signals are filtered by comb filters which suppress portions of the frequency spectra intermediate the significant portions.

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Inventors: Shida, Seiya (Tokyo, JP)
Fushimi, Shigeo (Tokyo, JP)
Sato, Masao (Tokyo, JP)

Application Number: 843917
Filing Date: 1977-10-20
Publication_date: 1979-03-20
Assignee: Nippon Electric Co., Ltd. (Tokyo, JP)
Primary Class(es): 370/482 370/488, 370/497
Other Classes:
US Patent Ref:

3079464	Feb, 1963	Baumel	179/15.
3364311	Jan, 1968	Webb	179/15.
3605019	Sep, 1971	Cutter	179/15.
3969585	Jul, 1976	Boulanger	179/15.
3991277	Nov, 1976	Hirata	179/15.

Other Refs:
Primary Examiner: Cooper, William C.
Assistant Examiner: Popek, Joseph A.
Attorney: Sughrue, Rothwell, Mion, Zinn and Macpeak