Title:
A MULTIPLIERLESS INTERPOLATOR FOR A DELTA-SIGMA DIGITAL TO ANALOG CONVERTER
Document Type and Number:
WIPO Patent Application WO2001056167
Kind Code:
A3
Abstract:
A simplified algorithm for digital signal interpolation and a novel architecture to implement the algorithm in an integrated circuit ("IC") with significant space constraints are presented. According to the embodiments of the present invention, the interpolator is divided into two parts. The first part of the interpolator increases the sample rate by a factor of two and smoothes the signal using a half-band Infinite Impulse Response ("IIR") filter. The second part of the interpolator increases the sample rate of the signal by a factor of thirty-two using a zero-order-hold ("ZOH") circuit. In one embodiment, the half-band IIR filter is implemented using an all-pass lattice structure to minimize quantization effects. The lattice coefficients are chosen such that the structure can achieve all filter design requirements, yet is capable of being implemented with a small number of shifters and adders, and no multipliers.
Inventors:
WILSON GERALD
GREEN ROBERT S
GREEN ROBERT S
Application Number:
PCT/US2001/002744
Publication Date:
March 14, 2002
Filing Date:
January 26, 2001
Export Citation:
Assignee:
SONIC INNOVATIONS INC (US)
International Classes:
H03H17/02; H03H17/04; H03H17/06; (IPC1-7): H03H17/04
Domestic Patent References:
WO1999049578A1 | 1999-09-30 |
Other References:
SAMUELI H: "A LOW-COMPLEXITY MULTIPLIERLESS HALF-BAND RECURSIVE DIGITAL FILTER DESIGN", IEEE TRANSACTIONS ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING,US,IEEE INC. NEW YORK, vol. 37, no. 3, 1 March 1989 (1989-03-01), pages 442 - 444, XP000121358
VAIDYANATHAN, P.P.: "Multirate Systems and Filter Banks", 1993, PRENTICE HALL, ENGLEWOOD CLIFFS, US, XP002169917, 242830
VAIDYANATHAN, P.P.: "Multirate Systems and Filter Banks", 1993, PRENTICE HALL, ENGLEWOOD CLIFFS, US, XP002169917, 242830
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