Pulse or digital communications – Pulse code modulation – Noise or distortion reduction
Reexamination Certificate
2005-08-16
2005-08-16
Tran, Khai (Department: 2637)
Pulse or digital communications
Pulse code modulation
Noise or distortion reduction
C375S285000, C375S296000
Reexamination Certificate
active
06931072
ABSTRACT:
A process transmits digital data to an A/D converter via an analog channel. The process includes generating a sequence of output signals by precoding a sequence of input signal points to precompensate for ISI in the analog channel. In the precoding is matched to the ISI, at least one of the output signals would be distorted by the ISI to a signal representative of a signal point lying between quantization levels of the A/D converter. If the precoding is matched to the ISI, others of the output signals would be distorted by the ISI to signals representative of signal points that are quantization levels of the A/D converter. A majority of the input signal points are quantization levels of the A/D converter.
REFERENCES:
patent: 4713817 (1987-12-01), Wei
patent: 5195107 (1993-03-01), Wei
patent: 5394437 (1995-02-01), Ayanoglu et al.
patent: 5418798 (1995-05-01), Wei
patent: 5559561 (1996-09-01), Wei
patent: 5710790 (1998-01-01), Herzberg et al.
patent: 5790632 (1998-08-01), Antionio et al.
patent: 5854812 (1998-12-01), Huber et al.
patent: 5881108 (1999-03-01), Herzberg et al.
patent: 5953376 (1999-09-01), Wei
patent: 5986596 (1999-11-01), Waldron
patent: 5991278 (1999-11-01), Betts
patent: 6009121 (1999-12-01), Waldron et al.
patent: 6157678 (2000-12-01), Wei
patent: 6198776 (2001-03-01), Eyuboglu et al.
patent: 6363339 (2002-03-01), Rabipour et al.
patent: WO 99/34565 (1999-07-01), None
ITU-T Recommendation G.711, 1993.
Wei, L. F. et al:Combined Coding and Precoding for Recommendation V.92, V. 92, Rapporteur Meeting, Boca Raton, Florida, Jan. 11-14, 2000.
Wei, L. F. et al:Pre-equalization for Recommendation V.90—Issue 2, Telecommunications Industry Association (TIA), Clearwater, Florida, Nov. 29, 1999.
PCT Search Report, Application No. PCT/US01/11162, Oct. 23, 2001.
Lucent Technologies - Inc.
Lugo David B.
McCabe John F.
Tran Khai
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