Time division digital multiplexer apparatus

Details Time division digital multiplexer apparatus Time division digital multiplexer apparatus

1977-06-14

1978-10-17

Claffy, Kathleen

179 15BS, H04J 900

Patent

active

041210565

ABSTRACT:
A synchronous time division digital multiplexer apparatus utilizing frequency shift keying to transmit data from a plurality of parallel input channels that are sequentially sampled and converted to serial data having non-return to zero (NRZ) characteristics. Frequency shift keying is used to modulate the obtained serial data with a sinusoidal audio carrier. Simultaneously, the system clock is automatically modulated by means of frequency shift keying with another sinusoidal audio carrier, or manually by a repetitive frame synchronization pulse. The data carrier and clock carrier are linearly combined, bandpass filtered, and level adjusted for over a voice grade transmission media.

REFERENCES:
patent: 3746794 (1973-07-01), Stifle
patent: 4025720 (1977-05-01), Pachynski

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