Memory package system utilizing inductive coupling between memor

Details Memory package system utilizing inductive coupling between memor Memory package system utilizing inductive coupling between memor

1989-08-01

1991-12-03

Heckler, Thomas M.

Multiplex communications

Wide area network

Packet switching

36518902, H04J 100

Patent

active

050705008

ABSTRACT:
The bidirectional transmission to write or read out data is executed between a read/write unit and a memory module by the contactless electromagnetic coupling using induction coils. A spread spectrum communication technique is used in at least the up transmission to transmit data from the memory module to the read/write unit in the bidirectional transmission. Two kinds of chirp waves or M series having little correlation are used in the spread spectrum communication. For instance, in the case of using the chirp waves, on the transmission side, two kinds of chirp waves having little correlation are prepared and either one of the chirp waves is transmitted in correspondence with the data bit 0 or 1. On the reception side, the correlation between the reception signal and each of the reference values of the two kinds of chirp waves which have previously been stored is calculated and the data bits 0 and 1 are demodulated on the basis of the result of the calculation. Further, a frequency code signal including a combination of a preamble, a terminator, data, and a terminator is used in the down transmission from the read/write unit to the memory module.

REFERENCES:
patent: 4855994 (1989-08-01), Takeuchi et al.

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