Method and circuit for processing and filtering signals

A method for processing electrical signals comprising the steps of:

• providing a memory having a plurality of addresses for storing a plurality of first digital data signals, each representative of an instantaneous amplitude of a first input signal;
• selecting one of said first digital data signals in response to a second input signal;
• combining the selected one of said first digital data signals with a second digital data signal representative of an additional instantaneous amplitude of said first input signal, to produce a digital difference signal;
• producing a first output signal in response to said digital difference signal;
• and
• combining said digital difference signal and the selected one of said first digital data signals to produce a modified digital data signal and replacing the selected one of said first digital signals with said modified digital data signal in said memory.

A circuit for compensating for amplitude variation in an angle modulated composite signal comprising:

• a memory having a plurality of addresses for storing a plurality of first digital data signals, each representative of an instantaneous amplitude of the composite signal, wherein the composite signal includes a signal of interest and an interfering signal;
• means for selecting one of said first digital data signals in response to a first input signal, said interfering signal being correlated with said first input signal;
• means for combining the selected one of said first digital data signals with a second digital data signal representative of an additional instantaneous amplitude of said composite signal, to produce a digital difference signal;
• means for producing a first analog output signal in response to said digital difference signal;
• and
• means for combining said digital difference signal and the selected one of said first digital data signals to produce a modified digital data signal and for replacing the selected one of said first digital data signals with said modified digital data signal in said memory.

A circuit for compensating for amplitude variation in an angle modulated composite signal comprising:

• a memory having a plurality of addresses for storing a plurality of first digital data signals, each representative of an instantaneous amplitude of the composite signal, wherein the composite signal includes a signal of interest and an interfering signal;
• a first analog to digital converter producing an address signal for selecting one of said first digital data signals in response to a first input signal, said first input signal being correlated with said interfering signal;
• a first adder for combining the selected one of said first digital data signals with a second digital data signal representative of an additional instantaneous amplitude of said composite signal, to produce a digital difference signal;
• a first digital to analog converter for producing a first analog output signal in response to said digital difference signal;
• and
• a second adder for combining said digital difference signal and the selected one of said first digital data signals to produce a modified digital data signal and for replacing the selected one of said first digital data signals with said modified digital data signal in said memory.

A method for compensating for amplitude variation in an angle modulated composite signal, said method comprising the steps of:

• providing a memory having a plurality of addresses for storing a plurality of first digital data signals, each representative of an instantaneous amplitude of the composite signal, wherein the composite signal includes a signal of interest and an interfering signal;
• selecting one of said first digital data signals in response to a first input signal, said first input signal being correlated with said interfering signal;
• combining the selected one of said first digital data signals with a second digital data signal representative of an additional instantaneous amplitude of said composite signal, to produce a digital difference signal;
• producing a first analog output signal in response to said digital difference signal;
• combining said digital difference signal and the selected one of said first digital data signals to produce a modified digital data signal;
• and
• replacing the selected one of said first digital data signals with said modified digital data signal in said memory.