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US 4,435,804 AGranted
Sub-signal transmitting system
AssigneeFuji Xerox Co., Ltd.
InventorYoichi Tan
Life of this patent
Estimating the term…
Abstract
A data transmitting system where transmission in packet form takes place between several stations includes an encoder converting signals into a transmission waveform where the low frequency components are significantly attenuated. A sub-signal, notably a voice signal from a telephone set is multiplied on the low frequency region and also transmitted between the stations.
Claims7
A data transmission system wherein data is transmitted in packet form between multiple stations, comprising:
- main signal transmitting means for a main signal to be transmitted in the form of a packet, said main signal being directed along a transmission path including an encoder, said encoder converting said main signal into a transmission waveform having a power spectrum with significantly attenuated low frequency components;
- sub-signal transmitting means for a sub-signal to be transmitted, said sub-signal being independent of said main signal and being in the low frequency region of said encoder;
- means for superimposing said main signal and sub-signal and transmitting the combined signals.
Dependencies are inferred from the claim text.