Method and apparatus for digital compensation and digital equalization

Time domain apparatus for compensating a digital output signal from a signal processing system, said apparatus having a training phase and an operational phase, said apparatus comprising:

• training function generator means responsive to a trigger signal for generating a training signal for coupling to the signal processing system and to a controller means, during said training phase;
• adaptive digital filter means to be coupled to receive the digital output signal from the signal processing system for producing the compensated digital output signal during both the training and operational phases according to
• control information received from said controller means during said training phase;
• and
• time domain controller means for producing a trigger signal for coupling to said training function generator means, and control information responsive to the training signal and the compensated digital output signal, according to a time domain compensation criteria to couple multiplier coefficients to said adaptive digital filter means during said training phase, said control information being revised until said training signal and said compensated digital output signal are sufficiently similar one to the other to satisfy said compensation criteria.

Time domain apparatus for compensating a digital output signal from a signal processing system having an analog signal input port, said apparatus having a training phase and an operational phase, said apparatus comprising:

• training function generator means for generating a training signal in an analog format for coupling to the analog signal input port, a training signal in a digital format and a trigger signal responsive to the digital training signal each during said training phase;
• adaptive digital filter means to be coupled to receive the digital output signal from the signal processing system for producing the compensated digital output signal during both the training and operational phases according to control information received from a controller means during said training phase;
• and
• time domain controller means responsive to the digital training signal, the trigger signal and the compensated digital output signal for producing control information according to a time domain compensation criteria to couple multiplier coefficients to said adaptive digital filter means during said training phase, said control information being revised until said digital training signal and said compensated digital output signal are sufficiently similar one to the other to satisfy said compensation criteria.

Time domain apparatus for producing an equalized digital output signal from a first signal channel according to information from a digital output signal from a second signal channel, said apparatus having a training phase and an operational phase, said apparatus comprising:

• signal generation means to be coupled to the first and second signal channels for generating a training signal during the training phase;
• adaptive digital filter means coupled to receive the digital output signal from the first signal channel during both the training and the operational phases and control information from a controller means during the training phase for producing the equalized digital output signal during both the training and the operational phases;
• and
• time domain controller means responsive to the digital output signal from the second signal channel and the equalized digital output signal for producing control information according to a time domain equalization criteria to couple multiplier coefficients to said adaptive digital filter means during said training phase, said control information being revised until said digital output signal from the second channel and said equalized digital output signal are sufficiently similar one to the other to satisfy said equalization criteria.

A method for producing an equalized digital output signal from a digital output signal from a first signal channel according to information from a digital output signal from a second signal channel, comprising the steps of:

• coupling a signal to the first and second signal channels;
• producing the equalized digital output signal responsive to the digital output signal from the first signal channel and
• control information;
• and
• producing control information according to an equalization criteria responsive to the digital output signal from the second signal channel and the equalized digital output signal.