Pulse or digital communications – Pulse code modulation
Patent
1995-05-31
1998-08-11
Bocure, Tesfaldet
Pulse or digital communications
Pulse code modulation
375222, H04B 1404
Patent
active
057938091
ABSTRACT:
A transmitting Mu-law modem creates a probe signal by modifying the 7th bit of each of a number of PCM samples during the "hand-shaking" phase of a data connection. Furthermore, the transmitting Mu-law modem only makes this modification on those PCM samples that fall into the range of segment 1 as defined in CCITT Recommendation G.711. Similarly, a receiving Mu-law modem searches for this known pattern. Upon detection of this pattern, the receiving Mu-law modem provides an acknowledgment signal and both modems subsequently switch to a digital-mode of operation. On the other hand, if, in fact, there is a least one analog link in the data connection, the probe signal becomes distorted and, since the receiving Mu-law modem does not detect the probe signal, handshaking is completed in the standard fashion.
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patent: 5311578 (1994-05-01), Bremar et al.
patent: 5347539 (1994-09-01), Sridhar et al.
patent: 5448574 (1995-09-01), Yamaguchi
patent: 5463661 (1995-10-01), Moran, III et al.
patent: 5528679 (1996-06-01), Taarud
Bocure Tesfaldet
Paradyne Corporation
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