Method and system for reducing amplitude modulation (am) noise in am broadcast signals

A system for reducing a noise signal added to an amplitude modulated (AM) broadcast signal while travelling from a broadcasting antenna to a receiving antenna, comprising:

• a receiving unit for capturing a signal representative of the AM broadcast signal corrupted by the noise signal;
• a signal inverting unit for inverting the captured signal;
• a signal frequency determining unit for determining a carrying frequency of the AM broadcast signal and delaying the inverted waveform by a fraction of a cycle of the carrying frequency;
• a first signal differentiating unit for generating a difference signal by subtractively combining the captured signal and the delayed inverted signal;
• a signal amplitude reducing unit for reducing an amplitude of the generated difference signal using a noise-reduction control multiplier to generate an estimate noise signal, wherein the generated estimate noise signal represents an estimate of the corrupting noise signal;
• and
• a second signal differentiating unit for minimizing the corrupting noise signal component of the captured signal by subtractively combining the captured signal and the generated estimate noise signal.

A non-stationary computer readable storage medium having stored therein instructions executable by a computing element to cause the computing element to perform functions configured to reduce a noise signal added to an amplitude modulated (AM) broadcast signal while travelling from a broadcasting antenna to a receiving antenna, the functions comprising:

• capturing a signal representative of the AM broadcast signal corrupted by the noise signal via the receiving antenna;
• inverting the captured signal;
• determining a carrying frequency of the AM broadcast signal and delaying the inverted waveform by a fraction of a cycle of the carrying frequency;
• generating a difference signal by subtractively combining the captured signal and the delayed inverted signal;
• generating an estimate noise signal by reducing an amplitude of the generated difference signal using a noise-reduction control multiplier, wherein the generated estimate noise signal represents an estimate of the corrupting noise signal;
• and
• minimizing the corrupting noise signal component of the captured signal by subtractively combining the captured signal and the generated estimate noise signal.

A computing system comprising:

• at least one memory unit for storing program instructions for reducing a noise signal added to an amplitude modulated (AM) broadcast signal while travelling from a broadcasting antenna to a receiving antenna, and at least one processing unit for executing the program instructions;
• and
• wherein the program instructions comprise:
• capturing a signal representative of the AM broadcast signal corrupted by the noise signal via the receiving antenna;
• inverting the captured signal;
• determining a carrying frequency of the AM broadcast signal and delaying the inverted waveform by a fraction of a cycle of the carrying frequency;
• generating a difference signal by subtractively combining the captured signal and the delayed inverted signal;
• generating an estimate noise signal by reducing an amplitude of the generated difference signal using a noise-reduction control multiplier, wherein the generated estimate noise signal represents an estimate of the corrupting noise signal;
• and
• minimizing the corrupting noise signal component of the captured signal by subtractively combining the captured signal and the generated estimate noise signal.