Patent ID: 7158583

Claim:
A radio comprising: a first channel for receiving signals at a first carrier frequency; a second channel for receiving and transmitting signals at a second carrier frequency; a multiplexer connected to the first and second channels; an A/D converter and a D/A converter connecting the channels through the multiplexer to a digital signal processor; an oscillator connected to and providing a common sampling rate to the A/D and D/A converters; the digital signal processor controlling the multiplexer and modifying received and transmitted digital signals using the common sampling rate to accommodate for the different carrier frequencies by linear interpolation of the sampling rate; and wherein the linear interpolation for each interpolated sample Y n , at the desired sampling rate T 0 , is calculated from two samples X n+1 , X n at the common sampling rate T s as: Y n =X n +n ( T 0 −T s )/ T s ( X n+1 −X n ) where n is an integer.