Digital transmultiplexer

Details Digital transmultiplexer Digital transmultiplexer

1982-08-05

1985-04-09

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 70, H04J 400

Patent

active

045105987

ABSTRACT:
A system for the digital conversion of a time division multiplex signal into a frequency division multiplex signal wherein the signals of the individual time multiplex channels are filtered by means of bandpass filters, their sampling rates are increased by the factor N to fA and the output signals of these bandpass filters are combined, by means of a summing member, into the frequency multiplex signal, and/or a system for the digital conversion of a frequency multiplex signal into a time division multiplex signal, wherein the digitalized frequency multiplex signal is divided by means of respective bandpass filters into the signals of the individual frequency multiplex channels and their sampling rate fA is reduced by the factor N. The individual bandpass filters (BP) are designed as recursive filters having the transfer function

REFERENCES:
patent: 4117541 (1978-09-01), Ali
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"International Conference on Communications 1981", Denver, Co., U.S.A., Jun. 14-18, 1981, Per Channel, Memory Oriented, Transmultiplexer with Logarithmic Processing-Lab Model Implementation and Testing, by C. Kurth et al.
"TDM-FDM Converter", by A. Peled et al., IBM Technical Disclosure Bulletin, vol. 20, No. 10, Mar. 1978.
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"Proceedings of the IEEE", vol. 69, No. 3, Mar. 1981, Crochiere et al., Interpolation and Decimation of Digital Signals-A Tutorial Review.
"Per-Channel, Memory-Oriented, Transmultiplexer with Logarithmic Processing--Architecture and Simulation--", Kurth et al., Bell Telephone Laboratories, ICC, IEEE, 1981.
"1982 International Symposium on Circuits and Systems", Rome, Italy (May 10-12, 1982), Goeckler et al., A Per-Channel Transmultiplexer Applying 11R Filters and Logarithmic Processing.
S. L. Freeny, "TDM/FDM Translation as an Application of Digital Signal Processing", IEEE Communications Magazine, vol. 18 (Jan. 1980), pp. 5-15.

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