US20150003623A1 - Headset having a microphone - Google Patents
Headset having a microphone Download PDFInfo
- Publication number
- US20150003623A1 US20150003623A1 US14/308,973 US201414308973A US2015003623A1 US 20150003623 A1 US20150003623 A1 US 20150003623A1 US 201414308973 A US201414308973 A US 201414308973A US 2015003623 A1 US2015003623 A1 US 2015003623A1
- Authority
- US
- United States
- Prior art keywords
- audio signal
- microphone
- headset
- signal
- equalization filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000005236 sound signal Effects 0.000 claims abstract description 207
- 238000001228 spectrum Methods 0.000 claims abstract description 41
- 230000035945 sensitivity Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000004044 response Effects 0.000 claims description 36
- 230000000694 effects Effects 0.000 claims description 14
- 238000012546 transfer Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 7
- 230000001419 dependent effect Effects 0.000 claims description 7
- 230000009466 transformation Effects 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 12
- 230000006978 adaptation Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101001010782 Drosophila melanogaster Fez family zinc finger protein erm Proteins 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L21/0232—Processing in the frequency domain
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L15/00—Speech recognition
- G10L15/20—Speech recognition techniques specially adapted for robustness in adverse environments, e.g. in noise, of stress induced speech
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/21—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being power information
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/78—Detection of presence or absence of voice signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02166—Microphone arrays; Beamforming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
Definitions
- the present invention relates to noise cancelling headsets and a method of improving audio sensitivity for a headset, by for example determining one or more equalization filter coefficients so as to approximate a power spectrum of the output audio signal to an optimum power spectrum even when the microphones are being mis-positioned with respect to an optimal positioning of the microphone in view of the acoustic source.
- Headsets for communication are becoming increasingly used for voice communication and are used in all environments. Thus, the issue of reducing noise in the transmitted voice signal becomes increasingly relevant.
- Some headsets provide a boom for picking up acoustic sound, the boom may be a long boom for picking up sound directly at the user's mouth, others may have a short boom, or the boom may have an adjustable length.
- the issue of reducing noise while not reducing the signal quality is a challenge.
- headsets having a boom with acoustic pickup near the source of the acoustic signal, such as near a user's mouth, have been provided.
- microphones typically have a directional pattern tailored to receive an acoustic signal at a predetermined distance and under a well-defined angle.
- any mis-positioning of the boom with relation to the acoustic source will due to the directionality of the microphone typically lead to a reduced performance of the microphone, and thereby a reduced quality of the signal provided from the headset.
- the headset may be integrated with a cup provided to align a user's chin to the microphone.
- a cup is bulky and impractical and not comfortable for a user to wear for an extended period of time.
- a headset for voice communication comprising a speaker, a microphone unit comprising at least a first and a second microphone for picking up incoming sound and generating a first audio signal generated at least partly from the at least first microphone, and a second audio signal being at least partly generated from the at least second microphone.
- the headset further comprises a signal processor being configured to receive and analyse the first audio signal and the second audio signal to determine one or more equalization filter coefficients, and an equalization filter configured to receive the second audio signal and the one or more equalization filter coefficients, and to equalize the second audio signal according to the determined one or more equalization filter coefficients to provide an output audio signal.
- the one or more equalization filter coefficients may be determined so as to approximate a power spectrum of the output audio signal to a power spectrum of the first audio signal.
- the one or more equalization filter coefficients may be determined so that a ratio of the power spectrum of the output audio signal and the power spectrum of the first audio signal approximates a predetermined target ratio.
- the signal processor may determine an equalization function H eq (f) by analysing the first audio signal and the second audio signal in a signal processor, and equalize the second audio signal according to the determined equalization function H eq (f) to provide an output audio signal.
- the output audio signal may have a frequency response corresponding to the first audio signal.
- a microphone system comprising a microphone unit comprising at least first and second microphones for picking up incoming sound, and generating respective first and second audio signals, a first audio signal generated at least partly from the at least first microphone, and a second audio signal being at least partly generated from the at least second microphone.
- the headset further comprises a signal processor being configured to receive and analyse the first audio signal and the second audio signal to determine one or more equalization filter coefficients, and an equalization filter configured to receive the second audio signal and the one or more equalization filter coefficients, and to equalize the second audio signal according to the determined one or more equalization filter coefficients to provide an output audio signal.
- the one or more equalization filter coefficients may be determined so as to approximate a power spectrum of the output audio signal to a power spectrum of the first audio signal.
- a method of improving voice sensitivity for a headset comprises a speaker and a microphone unit comprising at least a first and a second microphone, the method comprises generating at least first and second audio signals from the at least first and second microphones and processing the first and second audio signals so as to approximate a power spectrum of an output audio signal to a power spectrum of the first audio signal.
- the method may furthermore comprise the steps of receiving an acoustic signal by the at least first and second microphones, generating a first audio signal and a second audio signal derived from the at least first and second microphones, analysing the first and second audio signals to determine one or more equalization filter coefficients and equalizing the second audio signal according to the determined one or more equalization filter coefficients to provide an output audio signal.
- the one or more equalization filter coefficients may be determined so as to approximate a power spectrum of the output audio signal to a power spectrum of the first audio signal.
- the method may comprise the step of determining a power ratio between the first audio signal and the second audio signal as a function of the frequency, and equalizing the second audio signal using the power ratio.
- the headset may further comprise a boom, such as a microphone boom.
- the boom is typically a longitudinal arm and the boom may extend from the ear of a user and towards the mouth of a user.
- the boom may be a long boom for picking up sound directly at the user's mouth, the boom may be a short boom, or the boom may have an adjustable length.
- the microphone boom may have openings connecting incoming audio to one or more microphones.
- the microphones may be provided in the microphone boom, or the headset may comprise a headphone or ear muff and the one or more microphones may be provided in the headphone.
- the microphone openings may be connected to the at least two microphones via sound tubes or channels, for example within the microphone boom.
- the microphone boom has at least two microphone openings and the at least two microphone openings connect to the at least first and second microphones.
- the noise cancelling properties of the microphones are important properties, especially if the headset is used in a noisy environment, for example such as in an office environment or a call center environment. Therefore, the headset microphones are typically noise cancelling microphones.
- Noise cancelling microphones typically have reduced sensitivity to distant sounds, and increased sensitivity to sounds stemming from an acoustic source nearby.
- the sensitivity is directional, so that the sensitivity is dependent on the positioning of the microphone with respect to the acoustic source, i.e. typically with respect to a user's mouth.
- the microphone, or microphone boom is positioned correctly with respect to the acoustic source, and decreased sensitivity is experienced if the microphone, or microphone boom, is positioned off a preferred axis with respect to the acoustic source.
- the frequency response of the acoustic signal may degrade when the microphone is positioned off the preferred axis.
- the microphone boom When a user wears a headset, typically, the microphone boom may be positioned with a certain flexibility to accommodate for example users having different head shapes and sizes, right and left ear use, etc. However, this also allows for mis-positioning of the microphone openings with respect to the user's mouth.
- the microphone(s), such as the at least first and second microphones, may be positioned in the microphone boom in acoustic communication with the microphone openings in the microphone boom.
- the microphone(s) may be electrically connected to other elements of the microphone unit which may be positioned outside the boom, such as in a headphone.
- the microphone boom may have microphone openings, and sound tubes or sound channels may be provided to guide the sound towards the microphone(s) which may be positioned in the headphone, thus the entire microphone assembly may be provided at the ear of a user.
- the microphone openings may be connected to microphones, such as to the at least two microphones, via sound tubes or channels.
- the microphone unit may comprise a microphone which may be a noise cancelling microphone, such as a noise reduced microphone, etc.
- the microphone unit may comprise a directional microphone, and may comprise one or more active or passive noise filters.
- a noise-cancelled microphone may also be provided by using two omnidirectional microphones and derive a directional response from first and second omnidirectional microphones.
- a beam former is provided in the microphone unit and an output audio signal from the microphones, such as the first and second audio signals, may have any directivity pattern which may be derived from the at least two microphones, such as from two or more omnidirectional microphones, from at least an omnidirectional microphone and a directional microphone, etc.
- the beam former may be a passive or an active beam former, and may use spatial filtering to obtain a desired output pattern.
- a microphone unit comprises at least one microphone, such as at least a first and a second microphone, and the microphone unit may further comprise a beam former being configured to receive a microphone output signal, such as first and/or second microphone output signals, and output a beam formed signal, such as a first and/or second audio signal, respectively.
- a microphone output signal such as first and/or second microphone output signals
- a beam formed signal such as a first and/or second audio signal
- the microphone unit may comprise a plurality of microphones, and the beam former may receive the plurality of microphone output signals to form the desired beam, i.e. the desired polar pattern for the output beam.
- a microphone unit may comprise a plurality of microphones and the beam former may receive a plurality of microphone output signals and generate an output beam formed signal, such as the first and/or second audio signal, generated as a weighted sum of audio signals from the plurality of microphones.
- the headset may comprise an A/D converter for converting the analog audio signal to a digital audio signal for processing.
- the A/D converter may be provided in the microphone unit and may be configured to receive a microphone output signal, or if applicable, a beam formed signal and generate a digital output (beamformed) signal, such as the first and second audio signals, respectively.
- the A/D converter may be provided in the signal processor, and convert the signals immediately before the signal processing of the signals.
- the first microphone may exhibit an omni-directional frequency response, and/or the second microphone may exhibit a noise-cancelled frequency response.
- the headset has a headphone, and the microphones, the beam former and/or the signal processor may be provided in the headphone.
- the signal processor may be configured to receive at least the first audio signal generated from the at least first microphone, and the second audio signal may be at least partly generated from the at least second microphone.
- the signal processor may be an adaptation block.
- the first and the second microphones exhibit different frequency responses, thus the polar pattern of the first and second microphones may be non-similar, so that the first microphone may exhibit a first frequency response, and the at least second microphone may exhibit a second frequency response.
- the first audio signal may for example be derived from an omnidirectional microphone
- the second audio signal may for example be derived from either a noise-cancelled microphone, or from a plurality of microphones, wherein output from the plurality of microphones are fed to one or more beamformers to provide a beamformed audio signal having the characteristics of a directional microphone, or noise-cancelled microphone.
- the noise cancelling microphone may retain its noise cancelling behaviour, that is regardless of microphone or boom placement.
- the voice pick-up sensitivity may be degraded by mis-positioning of the microphone or microphone boom, such as microphone openings in the boom.
- the level of the acoustic signal, such as voice may be reduced and also the frequency response of the acoustic signal may be degraded by the mis-positioning.
- the signal processor may be configured to receive and analyse at least the first audio signal and the second audio signal to determine filter coefficients, such as equalization filter coefficients.
- a filter such as a equalization filter, may be configured to receive the second audio signal and the filter coefficients, such as the equalization filter coefficients and to filter, or equalize, the second audio signal according to the determined filter coefficients, such as according to the determined equalization filter coefficients, to provide an output audio signal.
- the filter coefficients, such as the equalization filter coefficients may be determined so as to approximate a power spectrum of the output audio signal to a power spectrum of the first audio signal.
- the filter coefficients, such as the equalization filter coefficients are determined so that a ratio of the power spectrum of the output audio signal and the power spectrum of the first audio signal approximates a predetermined target ratio.
- the signal processor may be configured to adaptively determine the equalization filter coefficients.
- a feedback from for example the output audio signal, or a feedback from the filter may be provided to the signal processor so as to determine the filter coefficients adaptively.
- the signal processor may furthermore be configured to analyse the incoming signals, such as the first audio signal and the second audio signal, to determine an equalization function H eq (f) as dependent on frequency for the at least first and second audio signals.
- the signal processor may receive and analyse the incoming signals, such as the first and second signals.
- the analysis of the incoming signals may comprise determining signal correlations, such as cross correlation and autocorrelation of the incoming signal.
- the signal correlations may be performed in the time domain or the frequency domain or in the time-frequency domain.
- the analysis may be performed using any known transformation for analysing audio signals, such as for example a Fourier Transform, such as Fast Fourier Transform, Short-time Fourier transform, Discrete Fourier Transform, etc.
- the cross-correlation and autocorrelation of the incoming signals may establish the similarity of the signals.
- the equalization function H eq (f) may be an equalization function providing a frequency dependent filter function for the audio signals.
- the equalization filter may thus establish a frequency dependent gain, and for example apply a gain, such as a frequency dependent gain to the second audio signal and thereby amplify the second audio signal.
- the output audio signal has a flat frequency response such as a frequency response having limited variation in the relative response in dB over the frequency range in question, such as a variation of less than 1 dB, such as a variation of less than 3 dB.
- the analysis may in some embodiments comprise determining a power ratio between the audio signals, such as a power ratio between the first audio signal and the second audio signal, as a function of the frequency and the processor may determine an equalization function as the power ratio or as a function of the power ratio.
- the equalization function is typically provided to an equalization filter which is configured to receive the second audio signal and the equalization function H eq (f).
- the equalization filter equalizes the second audio signal according to the determined equalization function H eq (f).
- the output of the equalization filter, that is the output audio signal, may thereby obtain a frequency response corresponding to the first audio signal.
- the equalization function may be determined as the ratio between the cross-correlation of the incoming audio signals, such as the cross-correlation of the first and second audio signals, and the autocorrelation of the second audio signal.
- the first audio signal may derived from an omnidirectional microphone assembly and the second audio signal may be derived from a noise cancelling microphone assembly, thus the first and second audio signal may be derived from a plurality of first, respective, second microphones to provide the desired polar pattern.
- reference to a first microphone or a second microphone may refer to one or more assemblies having one or more microphones.
- the audio signal from the noise cancelling microphone is sensitive with regards to the placement of the microphone assembly in relation to the acoustic source, such as to a user's mouth, whereas an omnidirectional microphone is more tolerant with respect to the placement of the microphone, i.e. the microphone openings for the omnidirectional microphone, such as the placement of the microphone boom.
- the second audio signal may retain the noise-reducing or noise-cancelling behaviour irrespective of the placement of the microphone, i.e. such as the placement of the microphone openings of the microphone.
- the noise-sensitivity of the second microphone such as the noise-cancelling microphone may be retained even with a mis-positioning of the microphones, or the microphone boom.
- the audio or voice pick-up sensitivity may be reduced, so that the audio or voice level may be reduced, and furthermore also the frequency response of the audio or voice signal may be degraded by microphone mis-positioning.
- a transfer function such as a ratio between the first and second audio signals, may be determined.
- the second audio signal may be equalized using the transfer function to thereby yield a beam formed output which represent the noise-cancelling of a signal from a current (mis-)positioning of the noise-cancelling microphone assembly, such as microphone openings or microphone boom, and an audio or voice gain which corresponds substantially to the audio or voice gain of an optimally placed microphone, such as of the microphone openings or the microphone boom, of the omnidirectional microphone.
- the signal processor may furthermore comprise a voice activity detector, VAD, configured to detect when a user is speaking, so that the voice activity detector may detect presence and absence of human speech.
- VAD voice activity detector
- a voice activity detection signal may be generated from the first or the second audio signal indicating whether the user is talking into the headset microphone or not.
- the voice activity may be detected in any way as known by the person skilled in the art.
- the voice activity detection unit such as a VAD block, may measure the power P 1 (t) of the first audio signal with a given time constant of e.g. 50 milliseconds, and the VAD signal may be generated as
- vad( t ) true if P 1 ( t )> P th , false otherwise,
- P th is a predetermined constant, corresponding to a predetermined power threshold.
- the signal processor is configured to analyse the first and second audio signals when it is detected, for example by the voice activity detector that a user is speaking.
- the audio signals may be further processed in the signal processor to thereby detect and provide an indication of a sub-optimally placed microphone, such as sub-optimally placed microphone openings or microphone boom. Furthermore, upon detection of the sub-optimally positioning, the audio signal may be compensated accordingly.
- a sub-optimally placed microphone such as sub-optimally placed microphone openings or microphone boom.
- FIG. 1 shows a headset user wearing a headset with a microphone boom
- FIG. 2 shows a side view of a user wearing a headset
- FIG. 3 shows a side view of a headset
- FIG. 4 shows another side view of a headset
- FIG. 5 shows a flow chart of a method according to the present invention
- FIG. 6 shows schematically a microphone unit having two microphones
- FIG. 7 a - 7 c show embodiments of a microphone system according to the present invention
- FIG. 8 shows a flow chart illustrating another method according to the present invention.
- FIG. 9 shows sensitivity of the microphones dependent on microphone configuration and positioning.
- FIG. 1 shows a user 5 wearing an exemplary headset 1 for communication.
- the headset 1 shown is dual or binaural headset, having a headphone 2 at each ear, the two headphones 2 being interconnected through a headband 3 , extending over the user's head 10 , and a microphone boom 7 .
- the headphones 2 each have an ear cushion 9 towards the ear 8 of a user.
- any headset style may be used, i.e. single and dual headphones, using headbands, neckbands, earhooks, and any combination thereof, etc.
- the headphones may be in-ear ear-bud style headphones, over-the-ear style headphones, etc.
- the microphone may be provided in a microphone boom, in the headphone, as an in-line microphone, etc.
- the headset 2 as shown has a microphone boom 7 for picking up acoustic sound
- the microphone boom 7 as shown is a long microphone boom 7 for picking up sound directly at the user's mouth 6
- the microphone boom 7 may be a short boom, or may it may have an adjustable length.
- the microphone typically has been designed for an optimally placed position with relation to the acoustic source, in this case the mouth 6 of the user 5 . It is an advantage of providing a microphone boom 7 with acoustic pickup near the source of the acoustic signal, such as near a user's mouth 6 , as corresponding microphone may hereby be configured to receive the acoustic signal at a predetermined distance and under a well-defined angle and may typically have a directional polar pattern.
- any miss-positioning of the boom with relation to the acoustic source 6 will due to directionality of the microphone typically lead to a reduced performance of the microphone, and thereby a reduced quality of the signal provided from the headset 1 .
- the microphone boom 7 ′ would be mis-positioned for a normal directional microphone and the acoustic signal would be distorted.
- the microphone boom 7 is shown in an optimally position with the acoustic pickup being right in front of the user's mouth 6 , and angularly displaced microphone booms 7 ′ and 7 ′′ are shown next to the user's mouth. It is an advantage of the present invention that the headset according to the invention is substantially insensitive to such minor misplacements of the acoustic pick-up.
- the headset is shown in more detail, and the microphone boom 7 is shown optimally positioned with the acoustic pick up area 11 positioned substantially in front of the acoustic source (not shown), that is at an optimum microphone position with respect to the acoustic source.
- the microphone booms 7 ′ and 7 ′′ are angularly displaced from the optimum microphone position and it is an advantage of the present invention that the pick-up sensitivity for the microphones is substantially unchanged with an angular displacement, ⁇ 1 , ⁇ 2 , of up to 10°, such as up to 15°, such as up to 20°, or even up to 30°.
- the microphone boom 7 may be mis-positioned regardless of the wearing style.
- the microphone boom 7 may for example be rotatable around a headphone hub 12 , such as a headphone center, and the microphone boom 7 may be mis-positioned when the user 5 puts the headset 1 in place. Also, if the headset is mis-positioned when positioned on the user's head, the microphone boom may become askew.
- FIG. 4 a side view of the headset 1 is shown schematically.
- the headphone 2 is seen from the inside, i.e. from the side which is usually provided towards a user's head or cheek.
- a first acoustic pick up 14 and a second acoustic pick-up 15 are provided in the microphone boom 7 .
- the acoustic pick-up's 14 , 15 are typically openings in the microphone boom, and the openings 14 , 15 may be protected by a protective sheet, such as by a mesh or similar.
- the microphones may be provided directly in the microphone boom 7 and be electrically connected (connections not shown) to the headphone 2 for processing, or the microphone boom 7 may comprise sound channels (not shown) for guiding the sound from the acoustic pick up 14 , 15 to microphone(s) 16 , 17 in the headphone 2 .
- the first and second microphones are provided in microphone unit 29 , and the first and second microphones 16 , 17 pick-up incoming sound, i.e. sound impinging on openings 14 , 15 , and the microphone unit 29 outputs first 21 and second 22 audio signals, respectively.
- the headset 2 further comprises a processor 18 , such as a digital signal processor or adaptation block, being provided in the headphone 2 and configured to receive the first audio signal 21 generated from the at least first microphone opening 14 , and the second audio signal 22 being at least partly generated from the at least second microphone opening 15 .
- the signal processor 18 is configured to receive the first audio signal 21 at first input port 25 and to receive the second audio signal at second input port 26 and to analyse the first audio signal 21 and the second audio signal 22 to determine an equalization function H eq (f) as a function of frequency.
- the equalization function H eq (f) 23 and the second audio signal 22 are provided to an equalizer 19 which equalizes the second audio signal 22 according to the determined equalization function H eq (f) 23 .
- the output audio signal 24 from the equalizer 19 is in turn provided to speaker 20 . It is an advantage of the present invention that the output audio signal typically has a frequency response corresponding to the frequency response of the first audio signal.
- FIG. 5 a flow chart illustrating the method 50 of improving audio sensitivity according to the present invention is shown:
- step 51 acoustic signals are received by the at least first and second microphones 16 , 17
- step 52 first and second audio signals are generated as derived from the at least first and second microphones 16 , 17 .
- step 53 an equalization function H eq (f) is generated by analysing the first audio signal and the second audio signal in signal processor 18 , where after in step 54 , the second audio signal is equalized according to the determined equalization function H eq (f) to provide an output audio signal.
- the output audio signal may have a frequency response corresponding to the first audio signal.
- the output audio signal has a flat frequency response.
- FIG. 6 shows a microphone unit having at least first and second microphones 16 , 17 .
- the microphone unit 29 may comprises a first microphone 30 for receiving incoming sound and the first microphone 30 outputs a first microphone signal 32 .
- the microphone unit 29 further comprises an A/D converter 36 for converting the analog first microphone signal to a digital audio signal, i.e. to the first audio signal.
- the microphone unit 29 may further comprise a second microphone 31 for receiving incoming sound and the second microphone 31 outputs a second microphone signal 33 .
- the second microphone signal as well as the first microphone signal from the first microphone are provided to a beam former 35 .
- the beam former 35 outputs a second analog audio signal 32 .
- the microphone unit 29 further comprises an A/D converter 37 for converting the second analog audio signal to a digital audio signal, i.e. to the second audio signal 22 . It is envisaged that even though first and second A/D converters 36 , 37 are shown in the microphone unit 29 , the A/D converters could also be provided in the signal processor 18 , so that analog audio signals are transmitted from the microphone unit 29 to the signal processor 18 for A/D conversion and analysis.
- the first microphone and the second microphone are omnidirectional microphones.
- the first audio signal is derived from the first omnidirectional microphone, typically the frequency response for the omnidirectional microphone will be a flat frequency response, that is with limited variation in the relative response in dB over the frequency range in question, such as a variation of less than 1 dB, such as a variation of less than 3 dB.
- the first microphone signal and the second microphone signal are provided to the beam former 35 and the second audio signal is derived from the beam formed output of the omnidirectional microphones 30 , 31 .
- FIG. 7 a - c different system configurations, i.e. microphone signal processing system configurations for the headset, are shown.
- a microphone configuration corresponding to the microphones 16 , 17 as shown in FIG. 6 wherein two omnidirectional microphones receive the incoming audio.
- the first and second audio signal is provided to signal processor 18 and the transfer function H eq (f) is determined.
- a voice activity detector, VAD, 27 is provided between the microphone unit 29 and the signal processing.
- the VAD may be provided in either the first or second audio signal.
- the VAD receives at least a part of the first audio signal 32 and a VAD signal 28 is provided.
- the VAD signal 28 is true if voice is detected, and false otherwise.
- H eq (f) 23 and the second audio signal 33 is provided to equalization filter 19 .
- the output 41 of the equalization filter 19 may optionally be fed back to the signal processor 18 to provide a feedback 42 to the signal processor 18 , so as to provide an adaptive signal processing.
- the signal processor may furthermore calculate a gain to compensate for the mis-positioning so that the output 41 of the equalization filter 19 is amplified by amplifier 38 .
- the output signal is an equalized noise cancelled output 24 .
- the system comprises a first microphone 30 and a second noise cancelled microphone 39 .
- the second microphone signal 33 is provided directly to the signal processor 18 .
- the noise cancelled microphone is a directional microphone, such as a microphone having a directional polar pattern, such as a figure eight polar pattern or a cardioid polar pattern, etc.
- a noise cancelling microphone has a frequency response which varies with the frequency, and for example varies by 10-15 dB when the frequency ranges from 10 2 -10 4 Hz.
- the system comprises a plurality of microphones, 30 , 39 , up to n microphones.
- the system comprises beam formers to ensure that as well a beam having an omnidirectional polar pattern and a beam having a directional polar pattern are formed.
- the first audio signal 32 being derived from a beam having an omnidirectional polar pattern and the second audio signal 33 being derived from a beam having a directional polar pattern.
- VAD 27 and adaptive feedback 42 are only illustrated in FIG. 7 a , these features may be applied to any of microphone setup.
- FIG. 8 a flow chart illustrates another method according to the present invention.
- an acoustic signal is received by the at least first and second microphones
- a first audio signal and a second audio signal is generated as derived from the at least first and second microphones.
- the first and second audio signals are analysed to determine equalization filter coefficients in step 63
- the second audio signal is equalized according to the determined equalization filter coefficients.
- an output audio signal is provided wherein the power spectrum of the output audio signal approximates a power spectrum of the first audio signal.
- the filter coefficients may be determined in any way as known to a person skilled in the art.
- the filter coefficients may be determined from a transfer function using Fourier transform, least mean square, etc.
- the signal processor 18 may estimate the averaged power spectra S11(f) and S22(f) of the first and second audio signals, respectively. Typically, the estimation is only performed when voice activity is detected.
- S11(f,t) and S22(f,t) may be determined as:
- vad(t) is the voice activity detection signal which is true if voice activity is detected and false if voice activity is not detected
- P 1 (f,t) and P 2 (f,t) are the instantaneous power spectra of the first and second audio signals, respectively at time t and T is the interval between updates of S11 and S22.
- the signal processor 18 may generate the equalization transfer function HEQ(f,t) as follows:
- HEQ ( f,t ) sqrt( S 11( f,t )/ S 22( f,t ))* H target ( f )
- H target is a predetermined target response.
- the equalization filter coefficients may then be generated by an inverse discrete Fourier transform, DFT of HEQ(f,t):
- IDFT denotes the inverse digital (or discrete) Fourier transform and heq(t) is the vector of filter coefficients at time t.
- the equalization filter may be implemented as a FIR filter with time varying filter coefficients and may receive heq(t) as its coefficients.
- the equalization filter may be implemented using a fast Fourier Transform, FFT, based convolution, for example according to the overlap-add or overlap-save principles:
- DFT and IDFT denotes the digital Fourier transform and inverse digital Fourier transform, respectively, taken under the constraints of the overlap-add or overlap-save principles
- xb2(t) denotes a block (vector) of samples of the second audio signal taken at time t
- yb(t) denotes a block at time t of the output audio signal.
- equalization filter may use the HEQ(f,t) directly as its filter coefficients:
- the filter coefficients are determined as in any of the examples above, and where the signal processor 18 estimates an averaged cross power spectrum of the first and second audio signals under the condition of voice activity detection:
- X1(f,t) and X2(f,t) are the instantaneous spectra of the first and second audio signals, respectively, and conj( ) denotes complex conjugation.
- the equalization transfer function HEQ(f,t) may then be generated as follows:
- HEQ ( f,t ) S 12( f,t )/ S 22( f,t )* H target ( f ).
- equalization transfer function HEQ(f,T) may be generated as
- HEQ ( f,t ) abs( S 12( f,t )/ S 22( f,t ))* H target ( f ),
- abs( ) denotes the absolute value
- the equalization filter coefficients may be generated as mentioned above.
- the signal processor may 18 may estimate the instantaneous power spectra P 1 (f,t) and P Y (f,t) of the first audio signal and the output audio signal, respectively.
- the equalization transfer response may be generated as follows:
- u 1 and u 2 are adaptation step sizes.
- the initial HEQ is taken as:
- HEQ ( f, 0) H target ( f )
- the signal processor 18 may estimate the instantaneous power spectra P 1 (f,t) and P Y (f,t) of the first audio signal and the output audio signal, respectively.
- the equalization transfer response may then be generated as follows:
- c 1 and c 2 are adaptation step sizes.
- the equalization filter may implement a finite set of different transfer frequency responses H(f,k) and the signal processor may choose from this set so as to minimize a cost function.
- the adaptation block may implement a standard LMS adaptation scheme.
- heq ( t+T ) heq ( t )+ u*e ( t )* xb 2( t ) if vad( t ), heq ( t ) if not vad( t )
- u is the adaptation step size and xb2(t) is a block/vector of samples of the second audio signal taken at time t.
- the equalization filter may be implemented as a FIR filter and may receive heq(t) as its coefficients.
- the adaptation may follow an NLMS algorithm (normalized LMS):
- heq ( t+T ) heq ( t )+ u*e ( t )* xb 2( t )/ p 2 ( t ) if vad( t ), heq ( t ) if not vad( t ),
- p 2 (t) is the power of the second audio signal at time t measured with predetermined time constant.
- the LMS algorithm may be performed in the frequency domain.
- FIG. 9 shows simulations of the sensitivity of a headset having a microphone boom which is designed to be optimally placed at the optimum microphone position (which may be referred to as the mouth reference point, MRP.
- the simulations have been performed with two different microphone configurations, the solid curves are simulated with a standard noise cancelling microphone at the optimum microphone position, curve 91 , at a position 3 cm off the optimum microphone position, curve 92 , and at a position 6 cm off the optimum microphone position, curve 93 .
- the dashed curves are simulated with two omnidirectional microphones and DSP processing according to the present invention, the two omnidirectional microphones being spaced with 7.5 mm.
- the curve 94 shows sensitivity when the microphones are optimally positioned, the curve 95 shows sensitivity 3 cm away from the optimum position and the dotted curves shows sensitivity 6 cm away from the optimum position, and it is seen that the conventional noise cancelling microphone loses sensitivity, especially at lower frequencies, whereas the simulations of a headset according to the present invention exhibits almost constant sensitivity, such as having a sensitivity varying less than 1 dB over the frequency spectrum of 10 2 -10 4 .
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Human Computer Interaction (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Computational Linguistics (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Quality & Reliability (AREA)
- Circuit For Audible Band Transducer (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/349,050 US20170061983A1 (en) | 2013-06-28 | 2016-11-11 | Headset having a microphone |
US15/856,172 US10319392B2 (en) | 2013-06-28 | 2017-12-28 | Headset having a microphone |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13174281.9A EP2819429B1 (en) | 2013-06-28 | 2013-06-28 | A headset having a microphone |
EP13174281.9 | 2013-06-28 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/349,050 Continuation US20170061983A1 (en) | 2013-06-28 | 2016-11-11 | Headset having a microphone |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150003623A1 true US20150003623A1 (en) | 2015-01-01 |
Family
ID=48692382
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/308,973 Abandoned US20150003623A1 (en) | 2013-06-28 | 2014-06-19 | Headset having a microphone |
US15/349,050 Abandoned US20170061983A1 (en) | 2013-06-28 | 2016-11-11 | Headset having a microphone |
US15/856,172 Active US10319392B2 (en) | 2013-06-28 | 2017-12-28 | Headset having a microphone |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/349,050 Abandoned US20170061983A1 (en) | 2013-06-28 | 2016-11-11 | Headset having a microphone |
US15/856,172 Active US10319392B2 (en) | 2013-06-28 | 2017-12-28 | Headset having a microphone |
Country Status (3)
Country | Link |
---|---|
US (3) | US20150003623A1 (zh) |
EP (1) | EP2819429B1 (zh) |
CN (1) | CN104254029B (zh) |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150030173A1 (en) * | 2013-07-23 | 2015-01-29 | Sennheiser Electronic Gmbh & Co. Kg | Headphone and Headset |
US20160073203A1 (en) * | 2014-09-05 | 2016-03-10 | Bernafon Ag | Hearing device comprising a directional system |
USD780378S1 (en) | 2016-07-15 | 2017-02-28 | Julia Chow | Ear muff |
WO2017143067A1 (en) * | 2016-02-19 | 2017-08-24 | Dolby Laboratories Licensing Corporation | Sound capture for mobile devices |
US20180054667A1 (en) * | 2016-08-16 | 2018-02-22 | Bose Corporation | Multi-purpose aviation headsets |
US20180167754A1 (en) * | 2014-10-08 | 2018-06-14 | Gn Netcom A/S | Robust noise cancellation using uncalibrated microphones |
US20190132667A1 (en) * | 2017-10-30 | 2019-05-02 | Panasonic Intellectual Property Management Co., Ltd. | Headset |
US10332519B2 (en) * | 2015-04-07 | 2019-06-25 | Sony Corporation | Information processing apparatus, information processing method, and program |
US10368152B2 (en) * | 2016-09-23 | 2019-07-30 | Sennheiser Communications A/S | Microphone arrangement |
US10455328B2 (en) | 2017-07-14 | 2019-10-22 | Hand Held Products, Inc. | Adjustable microphone headset |
US10694301B2 (en) * | 2016-05-03 | 2020-06-23 | Sonova Ag | Audio transmission system |
US20200214601A1 (en) * | 2014-09-19 | 2020-07-09 | 3M Innovative Properties Company | Acoustically probed over-the-ear hearing assessment devices and methods |
CN112053698A (zh) * | 2020-07-31 | 2020-12-08 | 出门问问信息科技有限公司 | 语音转换方法及装置 |
TWI734171B (zh) * | 2019-08-19 | 2021-07-21 | 仁寶電腦工業股份有限公司 | 聽覺輔助系統 |
US20220312106A1 (en) * | 2019-09-20 | 2022-09-29 | Hewlett-Packard Development Company, L.P. | Noise generator |
US11528556B2 (en) | 2016-10-14 | 2022-12-13 | Nokia Technologies Oy | Method and apparatus for output signal equalization between microphones |
US11540038B2 (en) * | 2019-04-30 | 2022-12-27 | Shenzhen Shokz Co., Ltd. | Acoustic device |
USD973627S1 (en) * | 2021-05-17 | 2022-12-27 | B.In.C.A. Llc | Basketball headphone |
US11722821B2 (en) | 2016-02-19 | 2023-08-08 | Dolby Laboratories Licensing Corporation | Sound capture for mobile devices |
US20240029755A1 (en) * | 2022-07-19 | 2024-01-25 | Bose Corporation | Intelligent speech or dialogue enhancement |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10163453B2 (en) | 2014-10-24 | 2018-12-25 | Staton Techiya, Llc | Robust voice activity detector system for use with an earphone |
KR101731714B1 (ko) * | 2015-08-13 | 2017-04-28 | 중소기업은행 | 음질 개선을 위한 방법 및 헤드셋 |
US10013996B2 (en) * | 2015-09-18 | 2018-07-03 | Qualcomm Incorporated | Collaborative audio processing |
US9838783B2 (en) * | 2015-10-22 | 2017-12-05 | Cirrus Logic, Inc. | Adaptive phase-distortionless magnitude response equalization (MRE) for beamforming applications |
US9813833B1 (en) * | 2016-10-14 | 2017-11-07 | Nokia Technologies Oy | Method and apparatus for output signal equalization between microphones |
WO2018081155A1 (en) * | 2016-10-24 | 2018-05-03 | Avnera Corporation | Automatic noise cancellation using multiple microphones |
CN110140171B (zh) * | 2017-01-03 | 2023-08-22 | 皇家飞利浦有限公司 | 使用波束形成的音频捕获 |
US10564925B2 (en) * | 2017-02-07 | 2020-02-18 | Avnera Corporation | User voice activity detection methods, devices, assemblies, and components |
CN107094273A (zh) * | 2017-05-23 | 2017-08-25 | 诸爱道 | 安全的耳机 |
CN107204192B (zh) * | 2017-06-05 | 2020-10-09 | 歌尔科技有限公司 | 语音测试方法、语音增强方法及装置 |
EP3422736B1 (en) * | 2017-06-30 | 2020-07-29 | GN Audio A/S | Pop noise reduction in headsets having multiple microphones |
CN109257672B (zh) * | 2017-07-14 | 2020-10-02 | 东莞宝德电子有限公司 | 一体式环状头戴式耳机 |
DK179837B1 (en) * | 2017-12-30 | 2019-07-29 | Gn Audio A/S | MICROPHONE APPARATUS AND HEADSET |
US10771887B2 (en) * | 2018-12-21 | 2020-09-08 | Cisco Technology, Inc. | Anisotropic background audio signal control |
CN109639916B (zh) * | 2019-01-28 | 2021-07-16 | 合肥联宝信息技术有限公司 | 一种实现电话会议的方法及装置 |
US11206003B2 (en) * | 2019-07-18 | 2021-12-21 | Samsung Electronics Co., Ltd. | Personalized headphone equalization |
GB2626121A (en) | 2019-12-17 | 2024-07-17 | Cirrus Logic Int Semiconductor Ltd | Two-way microphone system using loudspeaker as one of the microphones |
EP4211677A1 (en) * | 2020-10-08 | 2023-07-19 | Huawei Technologies Co., Ltd. | An active noise cancellation device and method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080260175A1 (en) * | 2002-02-05 | 2008-10-23 | Mh Acoustics, Llc | Dual-Microphone Spatial Noise Suppression |
US20100296668A1 (en) * | 2009-04-23 | 2010-11-25 | Qualcomm Incorporated | Systems, methods, apparatus, and computer-readable media for automatic control of active noise cancellation |
EP2426950A2 (en) * | 2010-09-02 | 2012-03-07 | Sony Ericsson Mobile Communications AB | Noise suppression for sending voice with binaural microphones |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7346176B1 (en) | 2000-05-11 | 2008-03-18 | Plantronics, Inc. | Auto-adjust noise canceling microphone with position sensor |
US7561700B1 (en) | 2000-05-11 | 2009-07-14 | Plantronics, Inc. | Auto-adjust noise canceling microphone with position sensor |
US7171008B2 (en) | 2002-02-05 | 2007-01-30 | Mh Acoustics, Llc | Reducing noise in audio systems |
WO2007106399A2 (en) * | 2006-03-10 | 2007-09-20 | Mh Acoustics, Llc | Noise-reducing directional microphone array |
US7813923B2 (en) * | 2005-10-14 | 2010-10-12 | Microsoft Corporation | Calibration based beamforming, non-linear adaptive filtering, and multi-sensor headset |
US7773759B2 (en) * | 2006-08-10 | 2010-08-10 | Cambridge Silicon Radio, Ltd. | Dual microphone noise reduction for headset application |
US8831936B2 (en) * | 2008-05-29 | 2014-09-09 | Qualcomm Incorporated | Systems, methods, apparatus, and computer program products for speech signal processing using spectral contrast enhancement |
US8538749B2 (en) * | 2008-07-18 | 2013-09-17 | Qualcomm Incorporated | Systems, methods, apparatus, and computer program products for enhanced intelligibility |
DE102008055760A1 (de) * | 2008-11-04 | 2010-05-20 | Siemens Medical Instruments Pte. Ltd. | Adaptives Mikrofonsystem für ein Hörgerät und zugehöriges Verfahren zum Betrieb |
JP5407848B2 (ja) * | 2009-12-25 | 2014-02-05 | 富士通株式会社 | マイクロホンの指向性制御装置 |
BR112012031656A2 (pt) * | 2010-08-25 | 2016-11-08 | Asahi Chemical Ind | dispositivo, e método de separação de fontes sonoras, e, programa |
-
2013
- 2013-06-28 EP EP13174281.9A patent/EP2819429B1/en active Active
-
2014
- 2014-06-19 US US14/308,973 patent/US20150003623A1/en not_active Abandoned
- 2014-06-27 CN CN201410302533.5A patent/CN104254029B/zh active Active
-
2016
- 2016-11-11 US US15/349,050 patent/US20170061983A1/en not_active Abandoned
-
2017
- 2017-12-28 US US15/856,172 patent/US10319392B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080260175A1 (en) * | 2002-02-05 | 2008-10-23 | Mh Acoustics, Llc | Dual-Microphone Spatial Noise Suppression |
US20100296668A1 (en) * | 2009-04-23 | 2010-11-25 | Qualcomm Incorporated | Systems, methods, apparatus, and computer-readable media for automatic control of active noise cancellation |
EP2426950A2 (en) * | 2010-09-02 | 2012-03-07 | Sony Ericsson Mobile Communications AB | Noise suppression for sending voice with binaural microphones |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9247337B2 (en) * | 2013-07-23 | 2016-01-26 | Sennheiser Electronic Gmbh & Co. Kg | Headphone and headset |
US20150030173A1 (en) * | 2013-07-23 | 2015-01-29 | Sennheiser Electronic Gmbh & Co. Kg | Headphone and Headset |
US20160073203A1 (en) * | 2014-09-05 | 2016-03-10 | Bernafon Ag | Hearing device comprising a directional system |
US9800981B2 (en) * | 2014-09-05 | 2017-10-24 | Bernafon Ag | Hearing device comprising a directional system |
US20200214601A1 (en) * | 2014-09-19 | 2020-07-09 | 3M Innovative Properties Company | Acoustically probed over-the-ear hearing assessment devices and methods |
US11707210B2 (en) * | 2014-09-19 | 2023-07-25 | 3M Innovative Properties Company | Acoustically probed over-the-ear hearing assessment devices and methods |
US10225674B2 (en) * | 2014-10-08 | 2019-03-05 | Gn Netcom A/S | Robust noise cancellation using uncalibrated microphones |
US20180167754A1 (en) * | 2014-10-08 | 2018-06-14 | Gn Netcom A/S | Robust noise cancellation using uncalibrated microphones |
US10332519B2 (en) * | 2015-04-07 | 2019-06-25 | Sony Corporation | Information processing apparatus, information processing method, and program |
WO2017143067A1 (en) * | 2016-02-19 | 2017-08-24 | Dolby Laboratories Licensing Corporation | Sound capture for mobile devices |
US11863952B2 (en) | 2016-02-19 | 2024-01-02 | Dolby Laboratories Licensing Corporation | Sound capture for mobile devices |
US11722821B2 (en) | 2016-02-19 | 2023-08-08 | Dolby Laboratories Licensing Corporation | Sound capture for mobile devices |
US10694301B2 (en) * | 2016-05-03 | 2020-06-23 | Sonova Ag | Audio transmission system |
USD780378S1 (en) | 2016-07-15 | 2017-02-28 | Julia Chow | Ear muff |
US10051358B2 (en) * | 2016-08-16 | 2018-08-14 | Bose Corporation | Multi-purpose aviation headsets |
US20180054667A1 (en) * | 2016-08-16 | 2018-02-22 | Bose Corporation | Multi-purpose aviation headsets |
US10368152B2 (en) * | 2016-09-23 | 2019-07-30 | Sennheiser Communications A/S | Microphone arrangement |
US11528556B2 (en) | 2016-10-14 | 2022-12-13 | Nokia Technologies Oy | Method and apparatus for output signal equalization between microphones |
US10455328B2 (en) | 2017-07-14 | 2019-10-22 | Hand Held Products, Inc. | Adjustable microphone headset |
US10484778B2 (en) * | 2017-10-30 | 2019-11-19 | Panasonic Intellectual Property Management Co., Ltd. | Headset |
US20190132667A1 (en) * | 2017-10-30 | 2019-05-02 | Panasonic Intellectual Property Management Co., Ltd. | Headset |
US11540038B2 (en) * | 2019-04-30 | 2022-12-27 | Shenzhen Shokz Co., Ltd. | Acoustic device |
US11930314B2 (en) | 2019-04-30 | 2024-03-12 | Shenzhen Shokz Co., Ltd. | Acoustic device |
TWI734171B (zh) * | 2019-08-19 | 2021-07-21 | 仁寶電腦工業股份有限公司 | 聽覺輔助系統 |
US11290829B2 (en) | 2019-08-19 | 2022-03-29 | Compal Electronics, Inc. | Hearing assistance system |
US20220312106A1 (en) * | 2019-09-20 | 2022-09-29 | Hewlett-Packard Development Company, L.P. | Noise generator |
CN112053698A (zh) * | 2020-07-31 | 2020-12-08 | 出门问问信息科技有限公司 | 语音转换方法及装置 |
USD973627S1 (en) * | 2021-05-17 | 2022-12-27 | B.In.C.A. Llc | Basketball headphone |
US20240029755A1 (en) * | 2022-07-19 | 2024-01-25 | Bose Corporation | Intelligent speech or dialogue enhancement |
Also Published As
Publication number | Publication date |
---|---|
CN104254029B (zh) | 2017-07-18 |
EP2819429B1 (en) | 2016-06-22 |
CN104254029A (zh) | 2014-12-31 |
US10319392B2 (en) | 2019-06-11 |
EP2819429A1 (en) | 2014-12-31 |
US20170061983A1 (en) | 2017-03-02 |
US20180122400A1 (en) | 2018-05-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10319392B2 (en) | Headset having a microphone | |
US11056093B2 (en) | Automatic noise cancellation using multiple microphones | |
US11109163B2 (en) | Hearing aid comprising a beam former filtering unit comprising a smoothing unit | |
US9723422B2 (en) | Multi-microphone method for estimation of target and noise spectral variances for speech degraded by reverberation and optionally additive noise | |
CN112334972B (zh) | 耳机系统、个人声学设备以及用于检测反馈不稳定性的方法 | |
EP3057337B1 (en) | A hearing system comprising a separate microphone unit for picking up a users own voice | |
CN107071674B (zh) | 配置成定位声源的听力装置和听力系统 | |
US11134348B2 (en) | Method of operating a hearing aid system and a hearing aid system | |
US11330358B2 (en) | Wearable audio device with inner microphone adaptive noise reduction | |
US20160142815A1 (en) | Headset with end-firing microphone array and automatic calibration of end-firing array | |
EP3422736B1 (en) | Pop noise reduction in headsets having multiple microphones | |
CA2574793A1 (en) | Headset for separation of speech signals in a noisy environment | |
CN110169083B (zh) | 以波束形成进行控制的系统 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GN NETCOM A/S, DENMARK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RASMUSSEN, ERIK WITTHOEFFT;REEL/FRAME:033631/0996 Effective date: 20140703 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |