High speed voiceband data transmission and reception

Details High speed voiceband data transmission and reception High speed voiceband data transmission and reception

1987-07-21

1989-09-12

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

332106, 34082563, H03K 708

Patent

active

048667374

ABSTRACT:
ASCII characters are coded in the form of 8, 16 or longer digital words. Signal pulses with durations proportional to such digital words are generated and filtered so that the filtered signal has substantially the same duration as the unfiltered signal. The filtered signal fits within the voiceband so that it can be transmitted through a voiceband medium such as a telephone network. At the receiver, zero-crossings of the received signal are detected and from the duration between consecutive zero-crossings, the particular ASCII represented by the duration of such signal may be recovered.

REFERENCES:
patent: 3528011 (1970-09-01), Anderson
patent: 3783412 (1974-01-01), Libby
patent: 4051539 (1977-09-01), Geddes et al.
patent: 4128809 (1978-12-01), Kage
patent: 4207524 (1980-06-01), Purchase
patent: 4608630 (1986-08-01), Schott
patent: 4723308 (1988-02-01), Kobayashi et al.

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