Title:
COMPLEX DIGITAL AEMPLING CONNCTOR
Document Type and Number:
Japanese Patent JPH02249305
Kind Code:
A
Abstract:
PURPOSE: To obtain the complex digital sampling converter by using a mean base band sample so as to average a couple of quadrature phase Q data words thereby almost eliminating the effect of an analog signal input onto a DC bias and/or the effect of a sampling frequency error onto decoded data. CONSTITUTION: The converter is provided with an A/D converter means ADC 22 that receives an IF analog signal 22a, samples it with a signal having a frequency equivalent to a sampling speed nearly equal to a multiple of 4 of an IF signal frequency and converts the analog signal into a digital data stream and a digital mixer means 24 that converts the sampled data into a base band signal, and also with a means 30 that classifies interleaved successive in-phase I data word and quadrature phase Q data word into a couple of simultaneous I, Q data word streams, with a means 28 eliminating the effect of a DC offset of the analog IF signal fed to the ADC, and with a means 34 that corrects a mis-matching error in the simultaneous I and Q streams. Thus, the converter that is not affected substantially with a modulation signal decoded by a digital discriminator is obtained.
Inventors:
GARII JIYUUDO SAURUNIEE
RANDEI JIYOOJI HERERA
TEIMOSHII EDOWAADO SHIERU
RANDEI JIYOOJI HERERA
TEIMOSHII EDOWAADO SHIERU
Application Number:
JP31083089A
Publication Date:
October 05, 1990
Filing Date:
December 01, 1989
Export Citation:
Assignee:
GEN ELECTRIC
International Classes:
H03H17/08; H03D3/00; H04L27/00; H03D7/00; (IPC1-7): H03H17/08; H04L27/00
Attorney, Agent or Firm:
Shusaku Yamamoto