Data transmission system

Details Data transmission system Data transmission system

1987-04-20

1988-08-30

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 19, 332 9R, 340347DD, H03K 302, H03M 520

Patent

active

047682060

ABSTRACT:
In DAV (data above voice)-systems an analog speech signal is transmitted in the low-frequency portion of the spectrum of an encoded data signal. When a data signal encoded by the known WAL2 code is used, the high-pass filters, required for the separation of the two signals produce intersymbol interference extending over a large number of bit intervals, requiring complicated equalisers at the receive end for good detection. When encoding the data signal in accordance with the DAV-code, as illustrated in FIG. 2 this drawback is remedied. In addition, this DAV-code is advantageous in that the amplitude fractions, represented by a and b, can basically be chosen at will, allowing the low-frequency content of the code to be affected. When (a; b)=(11/16; 3/16) the encoded data signal can be generated very accurately and in a simple manner.

REFERENCES:
patent: 2995618 (1961-08-01), Van Duuren et al.
patent: 4313203 (1982-01-01), Van Gerwen et al.
patent: 4521766 (1985-06-01), Vry

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