Alarm immune program signal

Details Alarm immune program signal Alarm immune program signal

1982-08-31

1984-12-11

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

340347DD, H04J 1500

Patent

active

044882955

ABSTRACT:
An audio program signal is converted into 12-bit PCM words and two 12-bit words are inserted into three 8-bit time slots in a T1 line. To avoid interference from a "yellow" alarm in which the second bit positions of all of the 8-bit time slots are pre-empted, the three least significant bits are placed in the second, sixth and tenth bit positions of the 12-bit words, which alone can occupy the second bit position of the 8-bit time slots.
A translator for generating the 12-bit words from 14-bit linear PCM words is described. The six most significant bits of the 14-bit words address a ROM. Stored at each address in the ROM is a table of twelve instruction words. Each instruction word causes a selector switch to choose a bit of the output word from 1, 0 or an input bit. Bit order of the 12-bit words is therefore controlled by the order of instruction words in the tables of the ROM.

REFERENCES:
patent: 3970799 (1976-07-01), Colton et al.
patent: 3988545 (1976-10-01), Kuemmerle et al.
patent: 4205203 (1980-05-01), Mehta et al.

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