Communication apparatus automatically selecting one of two opera

Details Communication apparatus automatically selecting one of two opera Communication apparatus automatically selecting one of two opera

1995-06-06

1996-12-17

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359152, 34082544, 379 56, H04J 1408

Patent

active

055859526

ABSTRACT:
A communication apparatus includes a memory. The memory stores the protocol of an ASK system and the protocol of an IrDA system. These protocols require predetermined time periods of T1 and T2 prior to establishing a connection with a station of the other party. The memory further stores time periods of Ra, Rb, Sa, and Sb, where the relationship of (Ra+Rb).noteq.(Sa+Sb), Sa>T1, Sb>T2, Rb>T2 is established. The communication apparatus further includes a transmission circuit and a reception circuit for the ASK system, a transmission circuit and a reception circuit for the IrDA system, a timer, and a control circuit. The control circuit controls the transmission circuit, the reception circuit, and the timer while referring to the stored contents of the memory. The control circuit carries out a "handshaking" procedure with the station of the other party, alternately trying the ASK protocol and the IrDA protocol until it is determined which of the two protocols the two stations have in common, and setting a flag signal to select the fastest transmission protocol which the two stations have in common. The selected protocol is thereafter used for communication between the two stations.

REFERENCES:
patent: 5444438 (1995-08-01), Goldberg
patent: 5459457 (1995-10-01), Sharpe
English-language abstract of Wakimoto/Sony Corp. JP 5-292 146-A.

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