Efficient hardware implementation for signal reconstruction...

Details Efficient hardware implementation for signal reconstruction... Efficient hardware implementation for signal reconstruction...

2005-04-26

2005-04-26

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transceivers

Modems

C375S220000, C375S242000

Reexamination Certificate

active

06885698

ABSTRACT:
Method and apparatus for providing an improved quality voice band channel equalization in telecommunication systems employing v.90 transmission standard in which PCM modem signals passing through a digital-to-analog and analog-to-digital conversion processes between a central office switch and a multiple subscriber access system may be reconstructed with improved quality at the A/D converter side by variably adjusting the gain between the digital-to-analog conversion process at the central office switch and the analog-to-digital conversion process at the multiple subscriber access system, and low pass filtering the signal using a second order low pass notch filter to provide a boost of 6 dB at a frequency of 4 KHz.

REFERENCES:
patent: 6052412 (2000-04-01), Ruether et al.
patent: 6067316 (2000-05-01), Amrany et al.
patent: 6151364 (2000-11-01), Ruether et al.
patent: 6404829 (2002-06-01), Sonu

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