Alarm immune program signal

H - Electricity – 04 – J

Patent

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363/15

H04J 3/02 (2006.01) H04J 3/16 (2006.01) H04J 3/18 (2006.01)

Patent

CA 1198528

- 13 - ALARM IMMUNE PROGRAM SIGNAL 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 Tl 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.

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