Apparatus and method for digital combination of delta modulated

Details Apparatus and method for digital combination of delta modulated Apparatus and method for digital combination of delta modulated

1980-01-21

1982-01-26

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

179 1B, 370 62, 370112, 375 28, H03K 1322, H04J 304, H04M 356, H04Q 1104

Patent

active

043130330

ABSTRACT:
Apparatus and method for processing sound as delta modulated digital data bits. A speaker console communicates with a listener console through a central switching unit. Tri-state generators within the central switching unit convert bipolar data modulated speaker data to tri-state logic which is then multiplexed onto a bus. The bus is sampled by a plurality of listener modules of a majority detector unit according to desired speaker combinations and a majority output is thereby determined for each time slot. A data generator modifies a bipolar delta modulated idle waveform according to the state of the idle waveform and the historical output of a listener module, incrementing and decrementing a carry register and a borrow register in the data generator to reflect storage, insertion or cancelling of majority "ones" or "zeros". The combining logic of the data generator enables the central switching unit to produce a combined output having the initial speaker data bit rate.

REFERENCES:
patent: 3566038 (1971-02-01), Slavin
patent: 3748394 (1973-07-01), Thomas
patent: 3872255 (1975-03-01), Nance et al.
patent: 3883697 (1975-05-01), Brown
patent: 3937898 (1976-02-01), Presto et al.
patent: 3949298 (1976-04-01), Boxall

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