Codec supporting PCM modem communications over a universal digit

Details Codec supporting PCM modem communications over a universal digit Codec supporting PCM modem communications over a universal digit

1998-10-30

2000-11-21

Bocure, Tesfaldet

Pulse or digital communications

Pulse code modulation

Noise or distortion reduction

375232, 375222, H04B 1404, H04B 138, H04L 514

Patent

active

061513644

ABSTRACT:
A codec supports PCM modem communications (e.g., V.90, X2, or K56flex protocols) over a universal digital loop carrier (UDLC) having an analog interface to the central office (CO). The codec includes an analog-to-digital converter (ADC) that is synchronized to the CO clock, and an equalizer that has been trained to provide a transfer function to compensate for the distortion introduced by the CO line interface reconstruction filter and connecting circuits, to minimize resampling error. The features allow the codec to output a PCM stream that accurately reproduces the PCM data at the central office, at data rates sufficient to support PCM modem communications, as well as voice and conventional modem communications.

REFERENCES:
patent: 4646289 (1987-02-01), Tsiakas et al.
patent: 5297163 (1994-03-01), Pfeiffer
patent: 5394437 (1995-02-01), Ayanoglu et al.
patent: 5528625 (1996-06-01), Ayanoglu et al.
patent: 5636244 (1997-06-01), Goodson et al.
patent: 5801695 (1998-09-01), Townshend
patent: 5875229 (1999-02-01), Eyuboglu et al.
Ender Ayanoglu et al., "An Equalizer Design Technique for the PCM Modem: A New Modem for the Digital Public Switched Network," IEEE Transactions on Communications, Jun. 1998, pp. 763-774, vol. 46, No. 6.

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