Data receiver having variable rate symbol timing recovery with non-synchronized sampling

An adaptable, variable rate symbol timing recovery system for a digital signal receiver comprising:

• an analog to digital signal converter having analog signal input and digital data signal output terminals;
• a source of selectable data sampling clock signals coupled to said digital signal converter for sampling a signal received at said input terminal at a rate depending on a data rate and modulation characteristics of said signal received;
• digital signal processing loop means coupled to said digital data signal output terminal for adjustably producing interpolant signals in synchronism with data signals at said output terminal which are synchronous with respect to said selected rate clock signal, said digital signal processing loop means including interpolating means for interpolating among data signals which are asynchronous with respect to said data sampling clock signals for producing said interpolant signals, said interpolant signals having timing intervals between adjacent ones thereof which are adjusted by said loop to provide strobes substantially in synchronism with data symbols of said digital data signal;
• and
• controller means for selectively configuring said data sampling clock signal source and said digital signal processing loop according to the data rate and modulation characteristics of said signal received.

A variable rate timing symbol recovery system for a signal receiver comprising:

• an analog to digital converter configured to receive analog signals;
• a clock configured to produce clock signals for the analog to digital converter to sample the analog signals to produce digital signals, a rate of the clock signals depending on a data rate and modulation characteristics of the received analog signals;
• an interpolator configured to produce symbols from the sampled analog signals;
• and
• a controller for setting the rate of the clock signals and the rate of producing the symbols depending on the data rate and modulation characteristics of the received signals.

A method for recovering symbols having variable timing in a signal receiver, comprising the steps of:

• receiving analog signals in an analog to digital converter;
• selecting a rate of a clock signal depending on a data rate and modulation characteristics of the received analog signals;
• sampling the received analog signals at the rate of the clock signal in the analog to digital converter to produce digital signals;
• interpolating the digital signals to produce the symbols at the rate depending on the data rate and modulation characteristics of the received signals.