Multiplex communications – Wide area network – Packet switching
Patent
1978-12-22
1980-12-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
364724, H04J 400
Patent
active
042375517
ABSTRACT:
A transmultiplexer and method for use in a telephone system for translating information between time division and frequency division multiplexed formats. The transmultiplexer includes discrete cosine transform processor means connected to receive a linearly coded time division multiplexed signal representing a plurality of information channels for transforming the time division signal into a frequency division multiplexed signal and also includes weighting network means for weighting the transformed signal with predetermined real coefficients thereby forming a frequency division multiplexed signal corresponding to said time division multiplexed signal. The weighting network means are connected to receive a second multi-channel frequency division multiplexed signal for weighting the frequency signal with predetermined real coefficients thereby forming a weighted signal. An inverse discrete cosine transform processor transforms the weighted signal into a multi-channel time division multiplexed signal corresponding to the frequency division multiplexed signal.
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Granger Associates
Olms Douglas W.
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