Interpolation pulse duration modulated adder

Details Interpolation pulse duration modulated adder Interpolation pulse duration modulated adder

1984-08-31

1987-02-24

Thomas, James D.

Pulse or digital communications

Repeaters

Testing

332 9R, 364723, H03K 118, H03K 708, H03K 908, G06F 738

Patent

active

046463216

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: 3440566 (1969-04-01), Swanson
patent: 4001728 (1977-01-01), Schneider
patent: 4099109 (1978-07-01), Abbondanti
patent: 4164714 (1979-08-01), Swanson
patent: 4549151 (1985-10-01), Kaneko

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