ΔΣ modulation digital-analog converter, digital...

Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C341S118000, C341S120000, C341S144000, C330S010000

Reexamination Certificate

active

07889109

ABSTRACT:
A ΔΣ modulation digital-analogue converter of the present invention includes: a look-up table in which a correspondence relationship between each of a plurality of possible input values of an input signal externally supplied, and each of compensation values individually associated with the possible input values, are stored; and a nonlinear compensation circuit (6) for compensating the input signal externally supplied, based on a compensation value associated with the input signal among the compensation values, and supplying a ΔΣ modulation section (1) the input signal thus compensated. A sine wave is used as the input signal. The compensation value is set based on magnitudes of a spectrum of odd-order harmonics whose frequencies are A times more than a frequency of the sine wave (A is an odd number), the spectrum obtained in such a manner that an output of a D-Class amplifier (2) or an output of the ΔΣ modulation digital-analogue converter is subjected to a frequency analysis without a compensation with respect to the sine wave by the nonlinear compensation circuit (6). Therefore, it is possible to provide a ΔΣ modulation digital-analogue converter which (i) suppresses generation of odd-order harmonics with a simple circuit arrangement, and therefore (ii) is excellent in SNR and THD+N.

REFERENCES:
patent: 6031481 (2000-02-01), Craven
patent: 6414614 (2002-07-01), Melanson
patent: 6441760 (2002-08-01), Albinet et al.
patent: 6473133 (2002-10-01), Twitchell et al.
patent: 6515604 (2003-02-01), Delano
patent: 6795004 (2004-09-01), Masuda et al.
patent: 7317758 (2008-01-01), Alrutz et al.
patent: 7626519 (2009-12-01), Risbo
patent: 7728658 (2010-06-01), Andersen et al.
patent: 2002/0079965 (2002-06-01), Maniwa et al.
patent: 2004/0051654 (2004-03-01), Ohkuri et al.
patent: 2007/0005160 (2007-01-01), Zaucha et al.
patent: 2008/0123873 (2008-05-01), Bjorn-Josefsen et al.
patent: 2008/0278230 (2008-11-01), Kost et al.
patent: 2009/0289705 (2009-11-01), Kobayashi et al.
patent: 2000-307428 (2000-11-01), None
patent: 2003-500876 (2003-01-01), None
patent: 2003-133959 (2003-05-01), None
patent: 2004-088430 (2004-03-01), None
patent: 2004-88430 (2004-03-01), None
patent: 2006-115028 (2006-04-01), None
patent: 2006-121529 (2006-05-01), None
patent: 2003-500876 (2007-01-01), None
patent: WO-00/74232 (2000-12-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

ΔΣ modulation digital-analog converter, digital... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with ΔΣ modulation digital-analog converter, digital..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ΔΣ modulation digital-analog converter, digital... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2630263

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.