Pulse or digital communications – Pulse code modulation – Correcting or reducing quantizing errors
Reexamination Certificate
2008-06-24
2008-06-24
Ha, Dac V. (Department: 2611)
Pulse or digital communications
Pulse code modulation
Correcting or reducing quantizing errors
C375S245000, C375S246000, C341S110000, C341S200000, C704S230000
Reexamination Certificate
active
07391814
ABSTRACT:
An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of effective ADC bits by compressing the baseband input analog signal using a logarithmic circuit. After the compressed analog signal is converted into a digital signal, a digital anti-log process or look-up table (LUT) is used to expand the digital signal back to the original linear scale. The word size of the output of the anti-log process is larger than the input word size due to the nature of the anti-log function. To reduce the word size of the digital signal an open loop normalization technique can be applied.
REFERENCES:
patent: 4025732 (1977-05-01), Traunmüller
patent: 4124773 (1978-11-01), Elkins
patent: 4132985 (1979-01-01), Kitaura
patent: 4189625 (1980-02-01), Strandberg
patent: 4250470 (1981-02-01), Szarvas
patent: 4903020 (1990-02-01), Wermuth et al.
patent: 5287556 (1994-02-01), Cahill
patent: 5446761 (1995-08-01), Nag et al.
patent: 5572452 (1996-11-01), Ostman et al.
patent: 6459889 (2002-10-01), Ruelke
patent: 6510188 (2003-01-01), Isaksen et al.
patent: 6577262 (2003-06-01), Veillette
patent: 7233624 (2007-06-01), Kazakevich et al.
patent: 2003/0002576 (2003-01-01), Whitehead et al.
patent: 2003/0181179 (2003-09-01), Darabi
patent: 0 595 406 (1993-10-01), None
patent: 06-164390 (1994-06-01), None
patent: 06-244887 (1994-09-01), None
patent: 09-098036 (1997-04-01), None
patent: 12-236276 (2000-08-01), None
patent: 2000 236276 (2000-08-01), None
Kazakevich Leonid
Yang Rui
Ha Dac V.
InterDigital Technology Corporation
Volpe and Koenig P.C.
LandOfFree
Gain control method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gain control method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gain control method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2805509