# US 2021/0243523 A1 · Helmet for communication in extreme wind and environmental noise > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243523 A1 - Document ID: US20210243523A1 - Status: Published application - Kind: A1 - Application number: 17/162,645 - Filed: 2021-01-29 - Published: 2021-08-05 - Earliest claimed: 2020-02-01 - Assignees: Bitwave Pte Ltd. - Applicants: BITwave Pte Ltd - Inventors: Siew Kok HUI; Au Ming; Ng Jiefeng Bryan - Web page: https://patentgrep.com/patent/US20210243523A1 ## CPC - H04R 1/46: Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope (throat mountings H04R1/14) - H04B 1/385: {Transceivers carried on the body, e.g. in helmets} - H04R 1/083: {Special constructions of mouthpieces} - H04R 1/1075: {Mountings of transducers in earphones or headphones} - H04R 3/005: {for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407)} - H04B 2001/3866: {carried on the head} - H04R 2201/023: Transducers incorporated in garment, rucksacks or the like - H04R 2201/10: Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups - H04R 2201/107: Monophonic and stereophonic headphones with microphone for two-way hands free communication - H04R 2460/13: Hearing devices using bone conduction transducers - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - H04B: TRANSMISSION ## Abstract A protective headgear including a multi-sensor array having a bone conduction microphone, air conduction microphone, signal processor, and speakers; a signal processor that processes vibration signal data and tonal signal data to produce combined data representative of the vocal communication to substantially reduce or eliminate noise; and a method of applying a signals optimized combination algorithm to optimize the output by intelligently combining the outputs from the two different types of sensors for both working in a noisy environment and quiet environment. ## Claims ### Claim 1 An apparatus integral with, or attachable to, a protective headgear, comprising: a cushioned bendable material integral with, or attachable to, an inside of a top part of the protective headgear; a bone conduction microphone, at a first position within the cushioned bendable material, that obtains vibration signal data representative of a vibration signal associated with vibration of a user vertex area of skull bone of a user, wherein the user vertex area of skull bone is located at a top part of skin of a head of the user that contacts or substantially contacts the bone conduction microphone, and wherein the vibration signal results from vocal communication of the user; an air conduction microphone integral with, or attachable to, the protective headgear at a second position away from the first position of the bone conduction microphone by at least a defined distance, wherein the air conduction microphone obtains tonal signal data representative of a tonal signal, received by the air conduction microphone via air and representative of the vocal communication of the user; and a signal processor that processes the vibration signal data and the tonal signal data, to produce combined data representative of the vocal communication that substantially reduces or eliminates at least one of a first noise associated with the vibration signal data or a second noise associated with the tonal signal data. ### Claim 2 (depends on 1) The apparatus of claim 1, further comprising: a wind sensor that senses wind signal data representative of an air noise signal resulting from incident air flow on the protective headgear, and wherein the signal processor processes the vibration signal data, the tonal signal data, and the wind signal data to produce the combined data representative of the vocal communication that substantially reduces or eliminates at least one of the first noise associated with the vibration signal data, the second noise associated with the tonal signal data, or a third noise associated with the wind signal data. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the second position is toward a front of the protective headgear relative to the first position by at least the defined distance, wherein, at the first position within the cushioned bendable material at the inside of the top part of the protective headgear, the bone conduction microphone is substantially isolated from other vibrational signals, wherein the other vibration signals comprise signals resulting from wind impacting the headgear or from external environment sound generated outside of the headgear impacting the headgear, and wherein the external environment sound comprises motor sound generated by a motor or engine. ### Claim 4 (depends on 1) The apparatus of claim 1, further comprising: a radio frequency transmitter to transmit the vocal communication by the user to another device; and a radio frequency receiver to receive other communications from the other device, wherein the other device is a user equipment or Internet of Things device. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the position of the bone conduction microphone within the cushioned bendable material and the bone conduction sensor facing the top part of the head corresponding to the user vertex isolates the bone conduction microphone from interference from the radio frequency transmitter or the radio frequency receiver. ### Claim 6 (depends on 1) The apparatus of claim 1, further comprising: a first speaker that outputs a first audio signal received from the signal processor representative of first audio for a first region associated with a left ear associated with the head; and a second speaker that outputs a second audio signal from the signal processor representative of second audio for a second region associated with a right ear associated with the head. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein, prior to producing the combined signal, a gain equalization is applied to the bone conduction microphone and the air conduction microphone to ensure a consistency of gain of respective outputs with respect to one another. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the signal processor comprises an acoustic echo canceller that removes or substantially removes, from the combined signal, echo signals that result from acoustic coupling between at least one of the bone conduction microphone and a speaker that renders the vocal communication of the user, or the air conduction microphone and the speaker. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the cushioned bendable material comprises at least one of at least one rubberized foam layer or at least one silicon casing layer. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the vibration signal data is represented as a first fast fourier transform of the vibration signal, wherein the tonal signal data is represented as a second fast fourier transform of the tonal signal, and wherein the signal processor processing the vibration signal data and the tonal signal data to produce the combined data comprises the signal processor determining whether a first running average energy of the vibration signal is greater than a second running average energy of the tonal signal. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the signal processor processing the vibration signal data and the tonal signal data to produce the combined data further comprises, in response to the first running average energy being determined to be greater than the second running average energy, applying a non-linear Fuzze function of the second running average energy divided by the first running average energy. ### Claim 12 (depends on 10) The apparatus of claim 10, wherein the signal processor processing the vibration signal data and the tonal signal data to produce the combined data further comprises, in response to the first running average energy being determined to be less than the second running average energy, applying a non-linear Fuzze function of the first running average energy divided by the second running average energy. ### Claim 13 A headgear apparatus, comprising: compressible foam material attachable to a top part of gear that is wearable by a head of a user, the compressible foam material comprising: a bone conduction microphone embedded in the compressible foam material and positioned to face a user vertex at a top portion of a skull of the user, wherein the bone conduction microphone senses a vibration signal, representative of vocal sound from the user, from a corresponding vibration of the user vertex at the top portion of the skull, wherein the bone conduction microphone being embedded at the top portion substantially isolates the vibration signal sensed by the bone conduction microphone from mechanical vibrations resulting from wind on the gear or air vibrations resulting from external sound on the gear from external environment sound generated outside of the gear; an air conduction microphone that senses a sound signal representative of the vocal sound received from the user by air, wherein the air conduction microphone is not comprised in the compressible foam material, and wherein the air conduction microphone is positioned away from the bone conduction microphone in order to receive the vocal sound of the user by air; and a signal processing unit that processes the vibration signal and the sound signal, to generate a combined signal representative of the vocal sound that substantially reduces at least one of a first noise associated with the vibration signal or a second noise associated with the sound signal, and that outputs the combined signal from the headgear apparatus to a device for further use or processing. ### Claim 14 (depends on 13) The headgear apparatus of claim 13, wherein the signal processing unit processing the vibration signal data and the tonal signal data to produce the combined data comprises the signal processing unit enhancing a defined high frequency band of frequencies represented in at least the vibration signal data. ### Claim 15 (depends on 13) The headgear apparatus of claim 13, wherein the combined signal is output from the headgear apparatus to the device for at least one of performing a command by the device associated with a voice command determined to be present in the vocal sound of the combined signal, storing the vocal sound by the other device, or communicating the vocal sound to at least one other device in communication with the device. ### Claim 16 (depends on 13) The headgear apparatus of claim 13, wherein the bone conduction microphone being embedded in the compressible foam material comprises the bone conduction microphone being encased by at least one silicon layer, resulting in an encased bone conduction microphone in the compressible foam material that makes contact with the user vertex through a cutout in the compressible foam material. ### Claim 17 (depends on 16) The headgear apparatus of claim 16, wherein the encased bone conduction microphone protrudes from the cutout in the compressible foam material to make a pressured contact with the head at the user vertex. ### Claim 18 A method, comprising: determining, by a signal processor of a headwear system, vibration signal data from a vibration signal representative of vocal sound from a user sensed via a bone conduction microphone positioned with respect to a user vertex on a top part of a head of the user; determining, by the signal processor, sound signal data from a sound signal received representative of the vocal sound that was sensed by an air conduction microphone by air, wherein the air conduction microphone is positioned at a front of the headwear system to receive the sound signal via air, and away from the bone conduction microphone to decrease an interference between the bone conduction microphone and the air conduction microphone relative to closer positioning of the bone conduction microphone and the air conduction microphone; processing, by the signal processor, the vibration signal data and the sound signal data to generate combined signal data representative of the vocal sound that increases a signal to noise ratio of the vocal sound of the combined signal data relative to the vocal sound as represented in the vibration signal data or the vocal sound as represented in the sound signal data, the processing comprising suppressing residual noise represented in the combined signal, resulting in processed combined signal data; and outputting, by the signal processor via radio frequency circuitry, the processed combined signal data to a user device for further usage by an application or service executed in connection with the user device. ### Claim 19 (depends on 18) The method of claim 18, further comprising applying, by the signal processor, adaptive noise suppression to defined frequency bands of the combined signal for further suppression of noise represented in the combined signal. ### Claim 20 (depends on 18) The method of claim 18, further comprising applying, by the signal processor, high frequency enhancement of frequencies represented in the combined signal that are in a defined high frequency range.