System and method for noise cancellation in emergency response vehicles

A noise cancellation system for a vehicle, comprising:

• a controller configured to:
• determine a waveform of a first sound wave at a first location;
• calculate another waveform of the first sound wave at a second location of an operator based on the waveform of the first sound wave at the first location and a first distance between the first location and the second location;
• generate at least one control signal based on the determined another waveform of the first sound wave at the second location;
• and
• at least one sound generator positioned at a third location, configured to:
• generate a second sound wave based on the at least one control signal, a waveform of the second sound wave being formed to cancel out the first sound wave at the second location,
• wherein the first sound wave is generated by a noise source,
• wherein the first sound wave at the second location comprises a directly transmitted portion and a reflected portion,
• wherein the directly transmitted portion corresponds to the first sound wave transmitted directly from the first location without being reflected off a surface of the vehicle, and the reflected portion corresponds to the first sound wave reflected off at least one surface of the vehicle,
• wherein the at least one control signal comprises a first control signal and a second control signal,
• wherein a portion of the second sound wave is generated based on the first control signal to cancel out the directly transmitted portion, and another portion of the second sound wave is generated based on the second control signal to cancel out the reflected portion.

A noise cancellation method for a vehicle, comprising:

• determining;
• by a controller, a waveform of a first sound wave at a first location;
• calculating, by the controller, another waveform of the first sound wave at a second location of an operator based on the waveform of the first sound wave at the first location and a first distance between the first location and the second location;
• generating, by the controller, at least one control signal based on the determined another waveform of the first sound wave at the second location;
• and
• generating, by a sound generator positioned at a third location, a second sound wave based on the at least one control signal,
• wherein a waveform of the second sound wave are formed to cancel out the first sound wave at the second location, and
• wherein the first sound wave is generated by a noise source;
• wherein the generating at least one control signal based on the determined another waveform of the first sound wave at the second location comprises:
• determining an angle at which the first sound wave enters into a cabin of the vehicle through a surface;
• calculating the another waveform of the first sound wave at the second location based on the determined angle,
• wherein when the determined angle gets closer to 90 degrees with respect to the surface of the vehicle, the amplitude of the first sound wave after passing through the surface of the vehicle becomes increased, and
• wherein when the determined angle gets farther away from the 90 degrees with respect to the surface of the vehicle, the amplitude of the first sound wave after passing through the surface of the vehicle becomes decreased.

A non-transitory computer-readable storage medium having computer readable program instructions, the computer readable program instructions read and executed by at least one processor for performing a method for noise cancellation in a vehicle, the method comprises:

• determining a waveform of a first sound wave at a first location;
• calculating another waveform of the first sound wave at a second location of an operator based on the waveform of the first sound wave at the first location and a first distance between the first location and the second location;
• generating at least one control signal based on the determined another waveform of the first sound wave at the second location, and generating, using a sound generator positioned at a third location, a second sound wave based on the at least one control signal, wherein a waveform of the second sound wave are formed to cancel out the first sound wave at the second location, and wherein the first sound wave is generated by a noise source, wherein the generating at least, one control signal based on the determined another waveform of the first sound wave at the second location comprises:
• determining an angle at which the first sound wave enters into a cabin of the vehicle through a surface;
• calculating the another waveform of the first sound wave at the second location based on the determined angle, wherein when the determined angle gets closer to 90 degrees with respect to the surface of the vehicle, the amplitude of the first sound wave after passing through the surface of the vehicle becomes increased, and wherein when the determined angle gets farther away from the 90 degrees with respect to the surface of the vehicle, the amplitude of the first sound wave after passing through the surface of the vehicle becomes decreased.