Method and system for reducing noise

System for producing at least one sound, the at least one sound including a desired sound and an anti-phase noise sound, the anti-phase noise sound being in anti-phase relative to a noise, the system comprising:

• at least one electroacoustic transducer for producing said at least one sound;
• at least one reference-acoustoelectric transducer for producing at least one reference noise signal by detecting said noise in a noisy environment;
• and
• an active noise reduction controller coupled with said at least one electroacoustic transducer and said at least one reference-acoustoelectric transducer,
• wherein said active noise reduction controller produces at least one sound signal according to said at least one reference noise signal and according to a desired sound signal respective of said desired sound, and
• wherein said at least one electroacoustic transducer produces said at least one sound, according to a respective one of said at least one sound signal.

System for producing an anti-phase noise sound, the system comprising:

• an electroacoustic transducer;
• a reference-acoustoelectric transducer for producing a reference noise signal by detecting noise in a noisy environment;
• and
• a digital active noise reduction controller coupled with said electroacoustic transducer and said reference-acoustoelectric transducer,
• wherein said digital active noise reduction controller produces a first anti-phase noise signal according to said reference noise signal, said first anti-phase noise signal being in anti-phase relative to said reference noise signal, and
• wherein said electroacoustic transducer produces said anti-phase noise sound, according to said first anti-phase noise signal.

System for producing sound, the sound including a desired sound and an anti-phase noise sound, the anti-phase noise sound being in anti-phase relative to a noise, the system comprising:

• an electroacoustic transducer;
• a reference-acoustoelectric transducer for producing a reference noise signal by detecting said noise in a noisy environment;
• an error-acoustoelectric transducer;
• a feedforward element coupled with said reference-acoustoelectric transducer;
• a feedback element coupled with said feedforward element;
• a first summing element coupled with said feedforward element, said feedback element and with said electroacoustic transducer;
• a second summing element coupled with said feedback element, said feedforward element and with said error-acoustoelectric transducer;
• a third summing element coupled with said feedback element and with said second summing element;
• a first estimated plant response element coupled with said second summing element;
• and
• a second estimated plant response element coupled with said third summing element and with said electroacoustic transducer,
• wherein said first summing element produces a summation signal, by adding a feedback signal received from said feedback element, a feedforward signal received from said feedforward element, and a sound signal respective of said desired sound,
• wherein said electroacoustic transducer produces said sound according to said summation signal,
• wherein said first estimated plant response element produces a first estimated desired sound signal, respective of said desired sound as produced by said electroacoustic transducer,
• wherein said error-acoustoelectric transducer produces an error signal by detecting said sound,
• wherein said second summing element produces a first difference signal, by subtracting said first estimated desired sound signal from said error signal,
• wherein said second estimated plant response element produces an estimated difference signal, according to said summation signal,
• wherein said third summing element produces a second difference signal, by subtracting said estimated difference signal from said first difference signal,
• wherein said feedback element produces said feedback signal according to said first difference signal and said second difference signal, and wherein said feedforward element produces said feedforward signal, according to said reference noise signal and said first difference signal.

Method for producing a noise-free sound signal, the method comprising the procedures of:

• producing a noise bearing sound signal by detecting acoustic sound and noise;
• producing a reference noise signal by detecting noise;
• determining a correction signal according to said reference noise signal;
• and
• producing said noise-free sound signal, according to said noise bearing sound signal and said correction signal.

Method for producing a noise-canceling sound, the method comprising the procedures of:

• producing a reference noise signal by detecting noise;
• determining a noise-canceling signal according to said reference noise signal;
• and
• producing said noise-canceling sound according to said determined noise-canceling signal.

Method for producing an audio-and-noise-canceling sound, the method comprising the procedures of:

• producing a reference noise signal by detecting noise;
• receiving an audio signal;
• determining an audio-and-noise-canceling signal according to said reference noise signal and said audio signal;
• and
• producing said audio-and-noise-canceling sound according to said determined audio-and-noise-canceling signal.