Abstract: A stringed instrument, such as a semi-acoustic electric guitar, can employ a resonance system that consists of a body having at least one internal cavity accessed by a soundhole continuously extending from a top cover. The soundhole may have a continuously curvilinear transition from the top cover and a length corresponding with an altered resonance frequency of the instrument body.

Abstract: An information handling system EMI shield system couples to a circuit board to enclose an electronic device in a Faraday cage and includes a surface painted with a graphene paint to aid in dissipation of excess thermal energy from the electronic device. The EMI shield system has a frame that couples to the circuit board and interfaces with ground to define a boundary around an electronic device connector and has a shield that couples as a separate piece over the frame to enclose the electronic device. Graphene paint applied to some or all of the shield encourages rejection of excess thermal energy from within shield.

Abstract: An information handling system supports multi-radio and multi-antenna wireless communication by routing coaxial cables between the radios and antennas through a cable clip of a conductive material coupled to system ground and interfaced with the coaxial cable ground sheath through an opening formed in the coaxial cable outer casing. A current source of the radio frequency applies a current in phase with the radio signal to the coaxial cable outer casing to suppress crosstalk with coaxial cables of different frequencies.

Abstract: An information handling system includes an motion sensor, an embedded controller, and a battery charge indicator. The motion sensor detects a battery charge request, and provides a trigger signal in response to the battery charge request being detected. The embedded controller receives the trigger signal from the motion sensor, and requests a relative state of charge of a battery in response to the trigger signal. The embedded controller then receives the relative state of charge of the battery, and provides a relative state of charge indication signal. The battery charge indicator receives the relative state of charge indication signal, and outputs an indication of the relative state of charge of the battery based on relative state of charge indication signal.

Abstract: An information handling system manages operation of an infrared time of flight sensor to provide accurate and timely user presence and absence detection through monitoring of the time of flight distance detection for indications of object velocity that validates or invalidates a transition between the user presence and user absence states. An integrated sensor hub in a central processing unit stores distances received from the infrared time of flight sensor in a distance table in association with a time stamp of the distance measurement. During monitoring of distances received from the infrared time of flight sensor, if the integrated sensor hub detects a user absence or presence, validation of the transition is performed by analyzing the stored distances to determine a vector of velocity at the state transition.

Abstract: An information handling system to wirelessly transmit and receive data may include a base chassis including a processor, a memory, and a wireless adapter; a metal C-cover of the base chassis to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover, the speaker grill including a slot formed around a portion of a perimeter of the speaker grill that physically separates the portion of the speaker grill as a peninsula in the C-cover; a millimeter wave antenna element coupled to a back side of the speaker grill; and a sub-6 GHz antenna element to transmit via the slot formed around the perimeter of the speaker grill; wherein the speaker grill has a mesh pattern of grill openings sized to be transparent to millimeter wave frequencies emitted by the millimeter wave antenna element.

Abstract: An information handling system may detect fan blockage for one or more fans using a target value such as the rotational rate of a fan or a duty cycle value of the pulse width modulation (PWM) signal for a fan, and a monitored value includes at least the other one of the rotational rate of the fan or the duty cycle value of the PWM signal for the fan. The information handling system may determine whether either the duty cycle value of the PWM signal for a fan or the rotational rate of the fan meets or crosses a threshold value. The threshold value, for example, may include an intake blocking warning limit or a rotational rate limit. The information handling system may then generate a notification to the user, such as a re-positioning notification. The methods described or illustrated may be entirely implemented in an embedded controller.

Abstract: An information handling system to wirelessly transmit and receive data may include a base chassis including a metal C-cover and metal D-cover to house a processor, a memory, and a wireless adapter, the metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover to emit a target radio frequency (RF) including a slot formed around a portion of the speaker grill forming a peninsula on the speaker grill that is physically separated from the C-cover; an antenna element placed behind the speaker grill and operatively coupled to the wireless adapter; an electromagnetic interference (EMI) shield forming a cavity enclosing the speaker and the antenna element, including a plurality of metallic shielding walls extending from the C-cover to a D-cover of the information handling system; and a conductive rubber gasket placed between the plurality of conductive walls and the D-cover to shield the cavity from EMI sources.

Abstract: An information handling system supports multi-radio and multi-antenna wireless communication by routing coaxial cables between the radios and antennas through a cable clip of a conductive material coupled to system ground and interfaced with the coaxial cable ground sheath through an opening formed in the coaxial cable outer casing. A current source of the radio frequency applies a current in phase with the radio signal to the coaxial cable outer casing to suppress crosstalk with coaxial cables of different frequencies.

Abstract: An information handling system EMI shield system couples to a circuit board to enclose an electronic device in a Faraday cage and includes a surface painted with a graphene paint to aid in dissipation of excess thermal energy from the electronic device. The EMI shield system has a frame that couples to the circuit board and interfaces with ground to define a boundary around an electronic device connector and has a shield that couples as a separate piece over the frame to enclose the electronic device. Graphene paint applied to some or all of the shield encourages rejection of excess thermal energy from within shield.

Abstract: An information handling system to wirelessly transmit and receive data may include a base chassis including a metal C-cover and a D-cover, the metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves; a speaker grill platform antenna formed within the C-cover from a portion of the speaker grill to emit a target radio frequency (RF), including: a slot formed around the portion of the speaker grill to form a peninsula on the speaker grill that is physically separated from the C-cover; a cavity formed behind the peninsula between the C-cover and the D-cover, the cavity including walls formed around the back side of the peninsula to electrically isolate the cavity; a printed circuit board assembly (PCBA) including: an antenna front end circuit operatively coupled to the speaker grill to excite the speaker grill and dynamically switch frequencies based on the target frequency to be emitted by the speaker grill platform antenna; and a contact pin directly coupling an excitati

Abstract: An information handling system may include a processor; a battery to supply power to the information handling system, the battery comprising a voltage regulator to power a battery management unit (BMU) on the battery and set a system present pin of the BMU to a high voltage; the BMU to: detect a voltage indicator indicating a change in voltage state at a system present pin of the BMU that is externally connectable to a ground or voltage source at the information handling system, the voltage indicator indicative of an electrical coupling of the battery to the information handling system while the information handling system is in an off state; and register the voltage indicator within a battery register of the BMU; and a microcontroller, upon powering on of the information handling system, to read the voltage indicator at the battery register and determine that the battery has been coupled to the information handling system.

Abstract: A portable information handling system has dynamic foot disposed at a bottom surface of a housing that extends and retracts to adjust cooling airflow impedance at vents disposed at the bottom surface. The dynamic foot includes an actuator in an internal cavity having opposing ramp structures interfaced by a nickel titanium wire that changes phase when heated to move the ramp structures. In the example embodiment, a push-push lock engages and disengages the ramp structures at each activation of the nickel titanium wire so that an embedded controller controls foot extension and retraction by applying current to the nickel titanium wire that heats the wire based upon detection of predetermined thermal conditions in the housing.

Abstract: A portable information handling system integrates an infrared time of flight sensor to detect end user presence and absence. The portable information handling system has a portable housing with rotationally coupled housing portions so that the infrared time of flight sensor orientation relative to an end user changes its alignment axis based upon an expected end user position relative to the end user. An actuator interfaces with the infrared time of flight sensor to adjust its field of view based upon sensed housing position or configuration and adjusts end user presence/absence detection at actuation to change the orientation of the time of flight sensor, such as by resetting the sensor are re-aligning the scan field of view.

Abstract: An information handling system may detect fan blockage for one or more fans using a target value such as the rotational rate of a fan or a duty cycle value of the pulse width modulation (PWM) signal for a fan, and a monitored value includes at least the other one of the rotational rate of the fan or the duty cycle value of the PWM signal for the fan. The information handling system may determine whether either the duty cycle value of the PWM signal for a fan or the rotational rate of the fan meets or crosses a threshold value. The threshold value, for example, may include an intake blocking warning limit or a rotational rate limit. The information handling system may then generate a notification to the user, such as a re-positioning notification. The methods described or illustrated may be entirely implemented in an embedded controller.

Abstract: An information handling system to wirelessly transmit and receive data may include a base chassis including a processor, a memory, and a wireless adapter; a metal C-cover of the base chassis to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover, the speaker grill including a slot formed around a portion of a perimeter of the speaker grill that physically separates the portion of the speaker grill as a peninsula in the C-cover; a millimeter wave antenna element coupled to a back side of the speaker grill; and a sub-6 GHz antenna element to transmit via the slot formed around the perimeter of the speaker grill; wherein the speaker grill has a mesh pattern of grill openings sized to be transparent to millimeter wave frequencies emitted by the millimeter wave antenna element.

Abstract: An information handling system to wirelessly transmit and receive data may include a base chassis including a processor, a memory, and a wireless adapater; a metal C-cover of the base chassis to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover, the speaker grill including a slot formed around a portion of a perimeter of the speaker grill that physically separates the portion of the speaker grill as a peninsula in the C-cover; a millimeter wave antenna element coupled to a back side of the speaker grill; and a sub-6 GHz antenna element to transmit via the slot formed around the perimeter of the speaker grill; wherein the speaker grill has a mesh pattern of grill openings sized to be transparent to millimeter wave frequencies emitted by the millimeter wave antenna element.

Abstract: An information handling system to wirelessly transmit and receive data may include a processor; a memory; an input/output (I/O) device; a wireless adapter; a metal C-cover to house a speaker grill, the speaker grill covering a speaker to emit audio waves; the speaker grill formed within the C-cover to emit a target radio frequency (RF), including: a slot formed around an operative antenna portion of the speaker grill forming a peninsula of the speaker grill in the C-cover; an antenna cavity formed on a back side of the peninsula, the antenna cavity including walls formed around the cavity in the back side of the peninsula; and a tuning module operatively coupled to the speaker grill to excite the speaker grill and dynamically switch frequencies based on the target frequency to be emitted by the speaker grill.

Abstract: An information handling system to wirelessly transmit and receive data at an antenna may include a processor; a memory; a wireless adapter; a base metal chassis containing components of the information handling system, the base metal chassis including a C-cover and D-cover housing the components; a display metal chassis containing components of the information handling system, the display metal chassis including an A-cover and a B-cover housing the components; a hinge cavity formed at a hinge used to couple the base metal chassis and display metal chassis; a first antenna element formed within the C-cover near the hinge; a second antenna element formed within the C-cover near the hinge; and an edge resonant isolator formed into the A-cover to disrupt an electrical ground coupling path formed between the base metal chassis and display metal chassis at the hinge cavity, wherein the edge resonant isolator includes a plurality of slits formed into the A-cover.