Waste air exhausting device having functionality to abate noise and modulate noise frequency

A waste air exhausting device having functionality to abate noise and modulate noise frequency, comprising:

• a housing, being provided with a first opening and a second opening on two ends thereof;
• a supporting plate, being disposed in the housing for forming a first space and a second space in the housing 10, and having at least one installing hole and one through hole thereon;
• an air exhausting pipe, being disposed in the housing by passing through the through hole of the supporting plate;
• wherein the air exhausting pipe has an air inlet end and an air outlet end respectively extending out of the housing via the first opening and the second opening, and the air inlet end of the air exhausting pipe being used for connecting to an exhaust port of an external engine;
• at least one loudspeaker, being disposed in the second space by connecting to the installing hole, so as to face the second opening of the housing;
• a noise sensing module, being disposed near to the exhaust port of the external engine for receiving an engine speed signal of the external engine or a noise signal produced during the external engine outputting a waste air by the exhaust port;
• an error signal sensing module, being disposed in the second space of the housing and adjacent to the air outlet end of the air exhausting pipe so as to face the least one loudspeaker;
• and
• a noise controller, comprising:
• a first input end, being connected to the noise sensing module;
• an output end, being electrically connected to the loudspeaker;
• and
• a second input end, being electrically connected to the error signal sensing module;
• wherein the noise controller is configured to produce an analog anti-noise signal according to the noise signal, and the analog anti-noise signal being then broadcasted in the second space of the housing by the loudspeaker for reducing, so as to reduce the noise level of the noise signal;
• wherein the error signal sensing module subsequently collects a remaining noise signal after a noise reduction is carried out between the analog anti-noise signal and the noise signal, and then transmits the remaining noise signal to the noise controller, such that the noise controller applies an adaptive modulation to the analog anti-noise signal according to the remaining noise signal;
• wherein noise controller is able to output an analog noise-modulating signal according to a reference signal and the engine speed signal, and broadcasting the analog noise-modulating signal by the loudspeaker, so as to modulate the noise signal to the reference signal.