Method and apparatus for generating a probing signal for a syste

Details Method and apparatus for generating a probing signal for a syste Method and apparatus for generating a probing signal for a syste

1997-08-12

1999-10-19

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375254, H04B 138, H04B 1404

Patent

active

059700890

ABSTRACT:
The present invention provides a method of generating a signal that may be used to determine the characteristic response of a communication channel that utilizes the public Digital Telephone Network (DTN). The channel includes the DTN, which may have Network Digital Attenuators (NDA) and/or Robbed Bit Signalling (RBS), and a Digital-to-Analog Converter (DAC), (also known as a codec), as well as the analog characteristics of the local loop, typically a twisted pair of copper wires. The present invention provides a method and apparatus to determine the optimal sampling instant of the received data stream. The present invention provides a probing signal that is well-suited for use in determining the channel's response to a known sequence of PCM codes used as data symbols. This is especially useful in so-called PCM modulation schemes that utilize the DTN, where knowledge of network and DAC distortion predicates the selection of available PCM codes used to represent data. This information is also useful when the data receiver, or PCM modem, makes determinations of which codes were actually sent.

REFERENCES:
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patent: 5715277 (1998-02-01), Goodson et al.
patent: 5825823 (1998-10-01), Goldstein et al.
"Communication Relating to the Results of the Partial International Search" for PCT Application No. PCT/US98/16725.

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