Patent ID: 6539064
Filing Date: 2003-03-25
Classification: H04L

Abstract:
A multi-rate data modulation circuit comprising:a multi-rate data conversion circuit that receives digital data at varying data rates, that receives a data rate input corresponding to the digital data and that converts the digital data to a filtered output based upon the data rate input; a modulator circuit that receives the converted output and that synthesizes a modulated output signal based upon the converted output, the multi-rate data conversion circuit comprising: a multi-rate converter that receives the digital data, the data rate input and a clock signal and converts the digital data to converted digital data; a multi-rate digital data filter that receives the converted digital data and produces a filtered digital output; an output scaler that receives the filtered digital output and produces a scaled and filtered digital output; and an adder that combines the scaled and filtered digital output with a center frequency input and produces the converted output.