A notebook computer includes a control chip, a speaker, and the fan. The control chip and the fan are disposed inside a chassis of the notebook computer. The method includes: controlling, by the control chip, the speaker to send a first sound signal, where the first sound signal and a first noise signal that is generated by running of the fan have opposite phases and a same frequency. The first sound signal is used to cancel the first noise signal.

A fan noise cancellation device comprises a base with a resonant ring formed with a plurality of resonance channels and a cover coupled to the base. Each resonance channel comprises an inner channel and an outer channel. Each inner channel has an opening to the resonant ring and has a length corresponding to a frequency. A baffle positioned in each inner channel determines an effective length of the inner channel. The inner channel baffles are coupled to the cover, wherein rotation of the cover relative to the resonance ring changes the position of the inner channel baffles to change the effective lengths of the inner channels to adjust the fan noise cancellation waveform frequency. Vanes on the cover are positioned in an airflow such that the airflow rotates the cover, and a spring in each resonance channel counteracts the rotation to adjust the inner channels.

An apparatus includes a computer enclosure with a first fan, a second fan, a fan controller, and an input for receiving a signal from a microphone indicating an amount of noise at a target location. The apparatus further includes a first actuator coupled to the first fan for adjusting an axial position of the first fan, wherein the controller controls the operation of the first actuator to position the first fan to reduce the noise indicated by the signal from the microphone with the first and second fans in operation. The microphone senses sound pressure and the controller automatically adjusts a position of one or more fans using an actuator to change the distance from the fan to the microphone, which may be co-located with a user, to provide destructive interference at the location of the microphone.

A mouse device includes a button switch, a microcontroller, a speaker drive circuitry and a speaker. The button switch is configured to produce a first sound when being actuated. The microcontroller is electrically coupled to the button switch. The button switch is configured to provide an actuation signal to the microcontroller when being actuated. The speaker drive circuitry is electrically coupled to the microcontroller and the speaker is electrically coupled to the speaker drive circuitry. The speaker drive circuitry is configured to drive the speaker to play a second sound that substantially cancels out the first sound.

A mouse device includes a button switch, a microcontroller, a speaker drive circuitry and a speaker. The button switch is configured to produce a first sound when being actuated. The microcontroller is electrically coupled to the button switch. The button switch is configured to provide an actuation signal to the microcontroller when being actuated. The speaker drive circuitry is electrically coupled to the microcontroller and the speaker is electrically coupled to the speaker drive circuitry. The speaker drive circuitry is configured to drive the speaker to play a second sound that substantially cancels out the first sound.

An electronic device having a soundproof structure is provided. The electronic device includes a housing including an internal space, an inlet and an outlet formed on one side of the housing, a cooling fan disposed in the internal space, and configured to create an air-flow introduced from the inlet which is discharged to the outlet, and a sound absorbing member disposed to surround, at least in part, a peripheral area of the cooling fan in a direction to not obstruct the air-flow.

A fan control system applied to N fans inside a computer system is disclosed, comprising: a main microphone, a control circuitry, a wave generation circuitry and a number N of fan controllers. The control circuitry calculates a basic frequency value according to a temperature inside the computer system, and continuously updates a parameter by any known optimization algorithm according to a main audio signal from the main microphone. The wave generation circuitry generates N square waves according to the basic frequency value and the parameter. The N fan controllers respectively form and transmit N modulation signals to the N fans according to the N square waves and N tachometric signals from the N fans. The parameter is one of a frequency variation and a set of phase differences, and the N square waves have the same frequency.

Embodiments may be directed to a codesigned shroud for a chassis comprising a plurality of components and a plurality of fans generating a plurality of airflows to cool the plurality of components. The codesigned shroud may have a plurality of walls defining a plurality of channels, wherein at least two walls of the plurality of walls define each channel of the plurality of channels. Each channel may be aligned with a direction of an airflow of the plurality of airflows. At least one channel includes a set of baffles oriented substantially perpendicular to the direction of an airflow in the channel. Each baffle may be formed with acoustically absorbent material to absorb acoustic energy that could affect performance of a component, wherein a first baffle of the set of baffles is offset from a second baffle of the set of baffles.

In one embodiment, a method for managing a heatsink of an information handling system includes: determining, by a controller unit of the information handling system, that a vibration event is to occur, the vibration event associated with a vibration unit of the information handling system, the controller unit communicably coupled to the vibration unit, the vibration unit removably coupled to the heatsink; and causing, by the controller unit, the vibration unit to generate the vibration event, the vibration event causing the vibration unit to apply one or more vibrations to the heatsink, the one or more vibrations causing a boundary layer of particles to be removed from a surface of the heatsink.

An electronic system includes a fan module, a reference microphone, a micro speaker module, and an active noise cancellation controller. The micro speaker module provides a noise-cancellation signal according to a micro speaker control signal for canceling the noises generated during the operation of the electronic system. The reference microphone outputs a wide-band noise signal associated with the operation of the fan module. The active noise cancellation controller outputs a virtual error signal according to a first transfer function between the reference microphone and a physical microphone when the fan module operates with a predetermined fan speed, a second transfer function between the micro speaker module and the physical microphone when the fan module is not in operation, and the wide-band noise signal. The active noise cancellation controller provides the micro speaker control signal according to a synchronization signal, the wide-band noise signal and the virtual error signal.