Interpolation pulse duration modulation circuit

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

332 9R, 307265, H03K 708

Patent

active

046034250

ABSTRACT:
A pulse duration modulated (PDM) signal is generated from a periodic digitized signal which may be produced by sampling an analog signal of frequency F.sub.s and using a digitizing frequency F where F>>F.sub.s. Linearity of the analog signal between sampling points is assumed. A computer solution of the intercept of the assumed straight line between each pair of successive sample values of the digitized signal and a reference triangular waveform of frequency F/2 provides the time interval between intercepts from which the interpolated pulse duration modulated (IPDM) waveform is generated. A method to add low frequency signals in the IPDM domain, useful for providing Class AD amplifiers with a feedback path and for summations of input signals without converting signals back to analog form, operates on the sum of the respective intercept times of each of the signals. The summed intercept times are used to provide an IPDM signal which represents the sum of the original digitized signals. Multiplication of digitized signals in the nonlinear (IPDM) domain is provided by operating on the product of the intercepts of two IPDM signals to obtain the intercepts of a new IPDM signal whose low frequency content is the product of the low frequency component of the two digitized signals. Interpolated signals thus are able to be modulated and frequency shifted in the IPDM domain to improve the linearity of IPDM for higher frequency signals (F not much greater than F.sub.s).

REFERENCES:
patent: 4016501 (1977-04-01), Jasinski et al.
patent: 4099109 (1978-07-01), Abbondanti
patent: 4502024 (1985-02-01), Nishikawa et al.

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

Interpolation pulse duration modulation circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interpolation pulse duration modulation circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interpolation pulse duration modulation circuit will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-702947

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