H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/68
H03M 7/30 (2006.01) H03M 7/50 (2006.01) H04B 14/04 (2006.01)
Patent
CA 1093211
TANDEM BLOCK DIGITAL PROCESSOR FOR USE WITH NONUNIFORMLY ENCODED DIGITAL DATA Abstract of the Disclosure In a PCM system, character compression using nearly instantaneous companding (NIC) is known to obtain a reduction in the number of bits transmitted. Unfortun- ately, in tandem digital PCM-to-NIC-to-PCM conversions, a signal delay results because a maximum segment value is usually unknown until a block of PCM characters, which are to be converted to make up a block of NIC characters, has been received. Further, if the PCM block is received out-of-phase, a signal degradation may result because the incorrect maximum segment value may be used during a subsequent conversion. To mitigate delay, the disclosed processor discards certain least significant bits of a PCM character and substitutes therefor a predetermined bit pattern corresponding to the difference between the maximum segment value and the segment value of the first character of the block. To mitigate degradation, the processor adjusts the block phase upon detection of the absence of a predetermined difference between the maximum segment value and the segment value of another character in the block.
260603
Kirby Eades Gale Baker
Western Electric Company Incorporated
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