Superposition of data over voice

Details Superposition of data over voice Superposition of data over voice

2006-12-05

2006-12-05

Ramakrishnaiah, Melur (Department: 2614)

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

C379S093180, C379S093270, C370S493000

Reexamination Certificate

active

07145991

ABSTRACT:
Method and apparatus for transmitting messages between communication devices via a communication channel allowing at least voice messages to be transmitted, the messages including data subdivided in a sequence of basic data units, the method including: a) encoding the basic data units as unique signals (usj) including a predetermined number of basic signals (bi), each basic signal having a unique fixed frequency (fi); b) transmitting a sequence of unique signals (usj) during a sequence of fixed time periods (t1, t2,t3, . . . ); c) receiving and decoding the sequence of unique signals (usj) into the sequence of basic data units; the data being transmitted in superposition over voice.

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