Patent ID: 6144712
Filing Date: 2000-11-07
Classification: H04L

Abstract:
A modulator, comprising:first means for providing data inputs at a variable frequency,second means for providing clock signals at a sample clock frequency,a numerically controlled oscillator responsive to further data inputs representing the variable frequency and the clock signals at the sample clock frequency for providing clock signals at a fixed output sampling rate, and including third means for providing a signal representing an offset in phase between the clock signals at the fixed output sampling rate and the clock signals at the variable frequency, andan interpolator responsive to the offset in phase signals at the sample clock frequency for converting the variable frequency data input to an interpolated signal at a fixed sampling frequency, andwherein the interpolator includes fourth means for providing offsets between pairs of the data inputs at the variable frequency in accordance with the signal representing the phase offset between the clock signals at the fixed sampling rate and the clock signals at the variable frequency.