CN104221397A - Headset noise-based pulsed attenuation - Google Patents

Abstract

A headset having a talk-through microphones comprises an audio circuit. The audio circuit compresses a signal representing sounds detected by the talk-through microphones in response to the audio circuit detecting the onset of a peak (positive and/or negative) in the signal that exceeds a predetermined voltage level (positive and/or negative voltage level, perhaps a predetermined magnitude of voltage from a zero voltage level), and that does so with a rate of change in voltage level that exceeds a predetermined rate of change in voltage level. The degree of compression possibly is a compression to or near a zero amplitude (perhaps to or near a zero voltage level). The duration of the compression possibly is controlled by a timing circuit set to a predetermined period of time that may be retriggerable while amidst the predetermined period of time.

Description

Based on the impulse attenuation of earphone noise

the cross reference of related application

The part of the application's Application U.S. Serial No 13/336207 that to be Paul G.Yamkovoy propose on December 23rd, 2011 continues, and its disclosure is incorporated to its entirety by reference at this.

Technical field

The present invention relates to detect by the talk of earphone pass through quick startup environmental noise that microphone detects appearance thus temporarily weaken current audio frequency of talking.

Background technology

Along with for reducing arrival user's ear and user may be hindered to use the ability of one or more earphone characteristic (namely, listen to the music, carry out two-way communication etc.) the appearance of noise reduction earphone of more effective form of environmental noise, confirm to need in some degree, allow the voice of the another person near user still to arrive the ear of user, thus allow user and the other side to have conversation, and earphone can not be lifted down at least partially from least one ear of user.This causes " talk current ", and (TT) function is increased to such earphone, its use one or more filtering techniques be separated the voice of so-called another person and other ambient sounds and no matter such earphone whether provide passive Noise reduce (PNR) or active noise reduce (ANR) function can by those voice delivery to the ear of user.Unfortunately, ANR and the TT function of the electrical noise providing the false triggering of the audio compressor caused by a certain relatively loud ambient sound (that is, bombarding sound, explosive sound etc.) with relative rapid boot-up time simultaneously or be derived from the electrostatic discharge event such as producing the pulse being similar to the ambient sound relatively loud so also with relative rapid boot-up time has difficulties.

Summary of the invention

The earphone with current microphone of talking comprises voicefrequency circuit, detect in response to voicefrequency circuit and (just and/or negative voltage level exceeding predetermined voltage level, it may be the predetermined voltage size from zero voltage level, ) signal peak value (just and/or negative) beginning and there is when there is this situation the voltage level change rate of the predetermined variation rate exceeding voltage level, the signal of the sound that described voicefrequency circuit compression expression is detected by current microphone of talking, compression degree can be to be compressed to or close to zero amplitude (may be close to zero voltage level), the duration of compression can be controlled by the timing circuit being set to predetermined amount of time, and can trigger again within a predetermined period of time.

In an aspect, the method of sound controlling acoustically to be exported by the acoustic driver be arranged in the housing of earphone earplug comprises: compression expression exceedes predetermined voltage level and the peak value outbreak with the signal of the voltage level change rate exceeding predetermined variation rate in response to detecting, the signal of the sound detected by the microphone of earphone of the environment being acoustically coupled to outside.

In one aspect of the method, earphone comprises the first earplug comprising the first housing He be arranged in the first acoustic driver wherein; By communication headset structural bearing and be acoustically coupled to the first microphone of the environment of the first outside; With the voicefrequency circuit being coupled to the first acoustic driver and the first microphone, this voicefrequency circuit receives the signal that represents the sound detected by the first microphone and provides and export the first acoustic driver to.The response of this voicefrequency circuit detects and exceedes predetermined voltage level and have the outbreak of the signal peak of the voltage level change rate exceeding predetermined variation rate and compressed signal.

Accompanying drawing explanation

Fig. 1 a and Fig. 1 b is the perspective view of earphone.

Fig. 2 a and Fig. 2 b is the block diagram of the part of the possible electronic architecture of the earphone of Fig. 1 a.

Fig. 3 is the block diagram of the part of the variant comprising Fig. 2 a of ANR and the electronic architecture of Fig. 2 b.

Fig. 4 a and Fig. 4 b is the block diagram of the part of the possible electronic architecture of the earphone of Fig. 1 b.

Embodiment

The earphone disclosing herein and be required of to be applicable to broad variety, that is, can be worn over user's head or the device around it, wherein at least one acoustic driver is positioned near ear; Be applicable to the communication headset of broad variety, that is, form so in addition and microphone is positioned to towards user's mouth thus can bidirectional audio communication be carried out.Should be noted that; although suitably propose the specific embodiment of the earphone comprising a pair acoustic driver (each driver is used for an ear of user) in detail; but presenting specific embodiment is like this in order to by example promote understanding, should not be considered as the protection range limited the scope of the invention or claim covers.

Disclosing herein and being required of also provides to be applicable to the earphone that active noise reduces (ANR), passive Noise reduces (PNR) or combines both it.The earphone disclosing herein and be required of to be applicable to be coupled to various audio devices, includes but not limited to, talkback system (ICS), broadcast receiver, digital audio-frequency player; With by wired and/or wireless connections.Disclose and be required of the earphone in order to be applicable to have the physical configuration formed near one or two ear that can be worn over user herein, include but not limited to, headphone, behind-the-ear earphone, comprise at least one earplug and entity be worn over discretely the two-piece type earphone of neck or the microphone around it and comprise cap or the helmet of earplug and/or microphone.Those of ordinary skill in the art is applicable to other embodiments of the earphone disclosing and require herein by understanding.

Fig. 1 a and Fig. 1 b describes the embodiment that will be coupled to earphone 1000a and 1000b of audio devices, such as ICS, broadcast receiver, tape player, digital audio-frequency player etc.Earphone 1000a is the communication headset for bidirectional audio communication, comprises head assembly 100, upper cable 200, control box 300 and subjacent cable 400.Earphone 1000b is the simpler earphone being mainly used in listening audio frequency, comprises earphone 100 and the subjacent cable 400 of more simple form.

The head assembly 1000 of earphone 1000a with 1000b comprise a pair earplug 110 of each of having in a pair acoustic driver 115, coupling earplug 110 to together with headband 112 and a pair talk to pass through microphone 185.The microphone jib 122 that the head assembly of earphone 1000a comprises a pair feedforward ANR microphone 195 further, extend from an earplug 110 supports with by microphone jib 122 and comprises the microphone casing body 120 that noise eliminates the microphone 125 that communicates.Be included in further in the housing of at least one earplug 110 and/or another parts of head assembly 100 is the voicefrequency circuit 600 being electrically coupled to acoustic driver 115 (and/or the communication microphone 125 be coupled in earphone 1000a).As above describing, earphone 1000a-b has " wear-type " physical structure.But, although describe this specific physical structure, but those of ordinary skill in the art will easily recognize, head assembly 100 can adopt other physical structures various forms of, comprise the physical structure of the neckstrap of the earplug 110 extended between the physical structure only with an earplug 110 (therefore, only having an acoustic driver 115), the earplug 110 being used in around user's neck rear and/or not there is the physical structure of belt.Depend on the size of earplug 110 relative to the physical size of people's ear auricle, each earplug 110 can be " on ear " (being usually also called " ear-sticking ") or " around ear " (being usually also called " ring ear formula ") form earphone.

The control box 300 of earphone 1000a comprises the housing 330 containing control circuit 700.Control box 300 can also comprise one or more manually operated controller 335, and the user of earphone 1000a can be made manually to control the aspect of each function performed by earphone 1000a.Control box may further include cabin (not shown) and/or the battery 345 itself of the battery 345 being coupled to control circuit 700.In contrast, on earphone 1000b, control circuit 700, controller 335 and/or battery 345 (if existence) be included in one of housing 110 or both in.

The upper cable 200 of earphone 1000a is substantially by extend between an earplug 110 and control box 300 of headset assembly 100 and the multi-core power cable be coupled forms.When so doing, at least one subset of the wire of upper cable 200 is coupled and transmits the signal of telecommunication between the voicefrequency circuit 600 and the control circuit 700 of control box 300 of head assembly 100.In the various possibility variants of earphone 1000a, upper cable 200 can be formed as coiled shape, to be user-friendly to earphone 1000a.And, upper cable 200 can be included in the one or more connector (not shown) in upper cable 200 extraly, be coupled in connector place upper cable 200 housing 330 that an earplug 110 and/or upper cable 200 are coupled to control box 300, thus make upper cable 200 can disassemble from head assembly 100 and control box 300 or both.In contrast, make earphone 1000b not comprise control box 300 assuming that both voicefrequency circuit 600 and voicefrequency circuit 700 are included in the part of head assembly 100, then earphone 1000b does not comprise upper cable 200 yet.

Subjacent cable 400 is by extending from the control box 300 on earphone 1000a and/or forming from another multiconductor cable that the earplug of earphone 1000b 100 extends substantially.On earphone 1000a, subjacent cable 400 can disassemble from control box 300 (by one or more connector 480), its different variant terminates with one or more connector 490 (two variants just described), thus enables earphone 1000a removably be coupled to multiple audio devices.On earphone 1000b, the single variant of subjacent cable 400 more for good and all can be coupled to an earplug 110.Coupling between the circuit of any audio devices that at least one subset of the wire of subjacent cable 400 can be coupled at control circuit 700 and connector 490 and transmit the signal of telecommunication.In various possible variant, subjacent cable 400 can be formed as coiled shape, so that user uses earphone 1000.

As more specifically described in Fig. 1 a, earphone 1000a can be coupled to a not only audio devices, may comprise can by wireless signal 985 (namely, infrared signal, radiofrequency signal etc.) be coupled to wireless device 980 (namely, mobile phone, voice reproducing/tape deck, two-way broadcast receiver etc.) wireless transceiver, the user of earphone 1000a thus can be made to be interacted by earphone 1000 and wireless device 980 extraly.Alternatively or extraly, (namely earphone 1000a can comprise satellite interface, for at least receiving the connector of some form of the analog or digital signal representing audio frequency), earphone 1000a is enable to be coupled to non-wireless means 990 (namely by the conduction of the light of some form or conductive cable 995, audio playback, amusement broadcast etc.), enable user at least be listened to the audio frequency provided by non-wireless means 990 by earphone 1000a.When control box 300 comprises manually operated controller 335, the audio transmission that manually operated controller 335 can make the user of earphone 1000a coordinate between any audio devices that earphone 1000, wireless device 980, non-wireless means 990 and earphone 1000a can be coupled to through subjacent cable 400.In contrast, earphone 1000b is not specifically depicted as has such performance, but has an alternative variant of such performance yes possible.

Fig. 2 describes the possible embodiment of earphone 1000a operable electronic architecture 2000a.In order to promote understanding, earphone 1000a is depicted as and is coupled to audio devices 9000, in this example, audio devices be can two way audio transmission communicator, the such as vehicle-mounted radio of ICS or such as aircraft, military vehicle etc.Only describe the part in order to promote the audio devices 9000 required for discussion.As Fig. 1 a, Fig. 2 a imaging head parts 100 through the coupling of upper cable 200 to control box 300, and describes control box 300 through the coupling of subjacent cable 400 to audio devices 9000.Fig. 2 a describes the individual conductor of each cable 200 and 400 further.

Should again it is noted that voicefrequency circuit 600 can be present in completely only have an earplug 110 housing in; Maybe can be divided into multiple part, each part is distributed in the housing interior (in the variant of earphone 1000 with a pair earplug 110) of each earplug 110, other positions in the housing 120 with communication microphone 125 and/or in the structure of earphone 1000a.Therefore, although utilize single block delineations voicefrequency circuit 600 so that discuss, this should not be considered as meaning that all voicefrequency circuits 600 must exist in the single position of the structure of earphone 1000a.

As mentioned above, in electronic architecture 2000a, left audio frequency and right audio signal are used as the public system ground connection that signal returns are extended between audio devices 9000 and corresponding acoustic driver 115 by the wire of the wire in head assembly 100, cable 200 and 400 and the part of circuit 600 and 700 with subsidiary.There is provided independent left audio frequency and right audio signal that stereo audio can be provided to the ear of the user of earphone 1000a.As also described, microphone high pitched signal and microphone bass signal are extended between audio devices 9000 and communication microphone 125 by wire, the wire of cable 200 and 400 and the part of circuit 600 and 700 in head assembly 100 equally.

Those of ordinary skill in the art will be familiar with, (namely the extensive industrial practice of specific industry and/or government regulation generally designate supports bidirectional audio communication, the broadcast receiver represented by audio devices 9000 or ICS) the wire that is associated to the audio devices of such form at coupling ear microphone of the audio devices of concrete form between microphone bias voltage is provided, thus meet the needs of the microphone of some type of bias voltage.Those of ordinary skill in the art will be familiar with, what be considered to best practices is, maintain conductive lines ear microphone to ICS or broadcast receiver (namely, the wire microphone bass described and microphone high pitch) for being totally independent of the wire of coupling headphone acoustic driver and ICS or broadcast receiver (that is, the left audio frequency of the wire described, right audio frequency and system earth).As a part for such best practices, any coupling of any earth lead between the wire be associated with microphone and be associated with acoustic driver only appears in ICS or broadcast receiver (as the dotted line in audio devices 9000 is described), to attempt to avoid to produce the grounded circuit extended along cable couples earphone like this and ICS or wireless length.

Further, with so not consistent in specific industry be, support the various forms of audio devices of bidirectional audio communication can or at least one other wire without coupling audio device and earphone (that is, communicator power line as depicted) provide electrical power to earphone.When providing such power, usually say it is that what earth lead is associated with the acoustic driver of earphone (that is, system earth wire), instead of the wire be associated with the microphone of this earphone.As previously describe and discuss, subjacent cable 400 can disassemble from control box 300, thus allow the subjacent cable 400 using different editions, the connector 490 that subjacent cable has different size adapts to multi-form communicator (that is, the audio devices 9000 of different editions).Those of ordinary skill in the art will be familiar with, and the connector that audio devices 9000 can provide can or not supported to provide electrical power to earphone, and this can be one of difference of the subjacent cable 400 adapting to different editions.

Therefore, as depicted, control circuit 700 is supplied power to from audio devices 9000 (the communicator power line through subjacent cable 400) and battery 345 one or both.Consistent with other best practicess, the earth lead of battery 345 is also coupled to system earth usually.Similarly, no matter at least one head assembly power line of upper cable 200 will be supplied to the power transimission of control circuit 700 to voicefrequency circuit 600 from which kind of source.Earphone 1000a can use this electrical power to perform various function, include but not limited to, amplify the audio frequency exported by acoustic driver 115, amplify the audio frequency detected by communication microphone 125 in advance, there is provided the ANR of one or more form (therefore, ANR microphone 195 is described with the dotted line that may be coupled of voicefrequency circuit 600), to wireless transceiver energising with send and/or audio reception (namely, wireless transceiver for the formation of communication link 985), the audio frequency that acoustic driver 115 acoustics exports and/or detected by communication microphone 125 performs various forms of signal transacting, and/or current (TT) function of talking is provided, thus the voice of the environment from housing 110 outside optionally can be transmitted by available any passive Noise reduction (PNR) of earphone 1000a and/or ANR, so that (therefore it arrive the ear of user, current microphone 185 of talking is described with the dotted line that may be coupled of voicefrequency circuit 600).

As those of ordinary skill in the art easily recognizes; government regulation requires " fail safe " design supporting to use in the earphone of bidirectional audio communication to a certain degree usually; the basic function performing two-way communication (that is, utilization has its any ICS that can be coupled to or wireless earphone) can not be lost because of the loss of earphone power.Therefore, acoustic driver 115 still must can be used for two-way communication with the microphone 125 that communicates, even if audio devices 9000, battery 345 or any other source do not provide power.Therefore, when there is such power loss, common practice is to provide a kind of mechanism, the signal used in the basic operation of acoustic driver 115 with the microphone 125 that communicates by this mechanism will walk around any amplification or other circuit (that is, connector 490, between acoustic driver 115 and communication microphone 125 without interrupt delivery).

Utilize control box 300 to be loaded with and be coupled to the manual exercisable controller 335 of the control circuit 700 be also positioned at least in part in control box 300, be provided for the signal of the audio-frequency function controlling to be performed by voicefrequency circuit 600 at earphone 1000a, make it be passed to head assembly 100 through upper cable 200 from control box 300.Signal in the process performing one or more function and allow voicefrequency circuit 600 what does manually can be determined and/or can by determining in the mode of more automation in response to available electrical power by operation control 335 by it by user.In a possible method, electrical power is passed to voicefrequency circuit 600 by least one head assembly power line of upper cable 400, and have the mechanism of voltage level as one or more aspects of one or more performances of these each functions of control of selectivity change.In this way, control signal can be passed to voicefrequency circuit 600 from control circuit 700, and do not need to use the different pilots being increased to upper cable 400, do not need to use the data serial signaling system that less desirable complicated encoder circuit may be increased to control circuit 700 and voicefrequency circuit 600 yet.Tending to as the number of conductors of the antenna receiving EMI, by avoiding occurring a lot of voltage level and/or with the conversion of the sense of current using data serial signal by reducing, avoiding increasing different control signal wires and data serial signal can reduce the approach introducing electromagnetic interference (EMI).Further, in the dual role of transmitted power and transfer control signal, use power line to also reduce approach due to its introducing EMI caused as the inherent trend of AC coupling short over the ground.

Fig. 2 b describes a part for the possible execution mode of the voicefrequency circuit 600 be used in the electronic architecture 2000a of Fig. 2 a implementing the current function of talk in more detail.Therefore, for simplicity, the part closer with other characteristic relations of framework 2000a has been omitted.Still for simplicity, describe the parts with the voicefrequency circuit 600 only having an earplug 110 to be associated, but be not a pair earplug 110.Therefore, although what describe can be comprise a pair earplug 110 (therefore, the repetition subset of associated part at least one pair of acoustic driver 115 and voicefrequency circuit 600) the part of earphone 1000a form, but in order to avoid unnecessary VC, the acoustic driver 115 in a description voicefrequency circuit 600 and its parts be associated.

As depicted, the voicefrequency circuit 600 in the variant of electronic architecture 2000a comprise the talk pass circuit 685 being coupled to acoustic driver 115, the pulse attenuator 680 being coupled to talk current microphone 185 and talk pass circuit 685, represent for tap the signal of telecommunication of the audio frequency detected in its input by the microphone 125 that communicates differentiating amplifier 625 and be coupled to the output of differentiating amplifier 625 and the envelope detector 626 of talk pass circuit 685.And then, talk pass circuit 685 be depicted as comprise be coupled to and the controllable attenuator 686 of the output of received pulse attenuator 680, be coupled to the output of controllable attenuator 686 voltage controlled avalanche oscillator 687, be coupled to by its input voltage controlled avalanche oscillator 687 output and export by it the audio frequency amplifier 688 that is coupled to acoustic driver 115 and be also coupled to the output of audio frequency amplifier 688 and be coupled to the envelope detector 689 of control inputs of controllable attenuator 686.Pulse attenuator 680 is depicted as the amplifier of microphone 684 comprising and be coupled to current microphone 185 of talking by its input, the output of amplifier of microphone 684 and the comparator 683 of reference voltage source is coupled in its input by high pass filter (being made up of capacitor and resistor), its input be coupled to comparator 683 output and its export be coupled to the grid of MOSFET can trigger monostable multivibrator 682 again, and the analog switch 681 of MOSFET is coupled to by control inputs, under the control of MOSFET, controllable attenuator 686 is optionally coupled to by this analog switch current microphone 185 of talking.

In addition, it should be noted that in order to visually for purpose of brevity, be only depicted in the single acoustic driver 115 in voicefrequency circuit 600 and its circuit be associated (that is, talk pass circuit 685 and pulse attenuator 680).Therefore, in the embodiment of earphone 1000a with a pair earplug 110, a pair acoustic driver 115 will be had, each acoustic driver has the talk pass circuit be associated in a pair talk pass circuit 685 be coupled on it, and single envelope detector 626 will be coupled to each talk pass circuit 685.Further, this can be had a pair talk of being coupled on it by the associated pulse attenuator of a pair pulse attenuator 680 to each in talk pass circuit 685 and to pass through the current microphone of talking that is associated of microphone 185.Alternatively, the individual pulse attenuator 680 that the microphone 185 that passes through with single talk is associated can be coupled to a pair talk, two of passing through in device 685 talks current device 685.

It should be noted that different from the microphone 125 that communicates, current microphone 185 of talking is not noise cancelling microphone, the difference of the function that this reflection is performed by it.Favourable and preferably, communication microphone 125 is microphones that noise eliminates type, makes it be the near field microphone of the voice of the mouth of the user of the earphone 1000a in the comfortable near field of detection resources, tends to ignore far field sound simultaneously.In contrast, favourable and preferably, current microphone 185 of talking is not the microphone that such noise eliminates type, makes it can detect far field sound (that is, being derived from other people voice except user) and near field sounds.

The people being familiar with the current function of talk will recognize, talk pass circuit 685 works, with the voice delivery of the people that will be derived from except the user of earphone 1000a to acoustic driver 115, as at least one current microphone 185 of talking (to be coupled to by acoustics by earphone 1000a that the part of external environment condition carries, talk pass circuit 685 is indirectly coupled on it by pulse attenuator 680) detect, thus allow user to hear those voice, no matter earphone 1000a provides any PNR and/or ANR, otherwise usually stops user to hear those voice.In order to avoid having been passed out the sound outside voice by such PNR and/or ANR, talk pass circuit 685 has transmitted the sound in the predetermined audio frequency range be associated with people's voice that the current microphone 185 of talk detects.Although the following modification of talk pass circuit 685 can be had: it comprises difference band pass filter (not shown), sound in such scope that this filter will transmit separates (thus they are not passed) with the sound of such scope outside, but use the variant of the talk pass circuit 685 of the finite bandwidth variant of audio frequency amplifier 688 to be also fine like this, make audio frequency amplifier 688 except amplifying perform band-pass filtering function.

In talk pass circuit 685, envelope detector 689 and controllable attenuator 686 cooperation form of audio compressor and may implement, the output size of its monitoring audio frequency amplifier 688, and play response and detect that the output amplitude of the audio frequency amplifier 688 being supplied to acoustic driver 115 exceedes the moment of predetermined threshold and reduces the effect of the audio signal amplitude that audio frequency amplifier 688 receives from current microphone 185 of talking.Therefore, the compressor reducer produced by this cooperation is closed loop compressor reducer.Should be noted that, (namely the input that wherein there is not this audio compressor and audio frequency amplifier 688 is more directly coupled to the current microphone 185 of talk, may only have voltage controlled avalanche oscillator 687 and/or pulse attenuator 680 in-between) the alternate embodiments of talk pass circuit 685 be also fine, should be noted that, wherein such compression provides the alternate embodiments of the talk pass circuit 685 of (that is, open loop compressor reducer) to be also fine by the compressor reducer implemented in a completely different way.But; expect to be provided in audio compression function such in talk pass circuit 685 (namely; its any mode that can implement) as security feature, thus transmit by talk pass circuit 685 hearing that excessive ambient sound arrival user's ear protects the user of earphone 1000a by stoping.

Controllable attenuator 686 is combined to form in the mode of the AC coupling being provided to talk current microphone 185 (analog switch 681 by pulse attenuator 680) and adjustable votage divider by capacitor, resistor and MOSFET, and those of ordinary skill in the art knows this adjustable votage divider.The output of envelope detector 689 is coupled in the grid input of the MOSFET of controllable attenuator 686, thus makes envelope detector 689 operate MOSFET, the decay signal from current microphone 185 of talking being stood with control MOSFET.

Envelope detector 689 to be coupled together in the mode that the those of ordinary skill in audio compression field is known by diode, resistor and capacitor to be formed.The anode of diode is coupled to the output of audio frequency amplifier 688, and its negative electrode is coupled to first resistor.And then first resistor is coupled to capacitor and second resistor device (two resistors coupling grounding all further) further, and the grid of the MOSFET being coupled to controllable attenuator 686 inputs.Diode can make electric current from the output of audio frequency amplifier 688 to be flowed to the mode of capacitor charging by the first resistor (the first resistor controls charge rate), but does not allow subsequently by the output depletion of charge of audio frequency amplifier 688.On the contrary, the second resistor provides controlled consumption charge velocity---and the input of the grid of the MOSFET of controllable attenuator 686 has too high earth impedance and cannot provide can another path of electric current of depletion capacitor.Therefore, envelope detector, be effective as the integrator of the peak value of the audio signal exported by audio frequency amplifier 688, capacitor stores the electric charge that the more high amplitude that exported by this signal builds up, and by the second resistor with in check rate discharge, the result voltage level that capacitor has charged to is provided to the grid input of MOSFET.

It should be noted that the description of the envelope detector in Fig. 3 than the more symbolism of schematic diagram theory of operation, can carry out various parts replacement because easily recognize according to those of ordinary skill in the art.Such as, the passive diode described can be replaced with active circuit, and this active circuit has and is applicable to the behavior that the ideal diode of (or closely) zero falls and be in wherein forward bias voltage more closely.Should also be noted that the coupling order described can overturn because diode and the first resistor series winding are coupled together with the output of transmission of audio amplifier 688.Should be it is further noted that, as depicted, envelope detector 689 is variants of half-wave envelope detector, and half-wave envelope detector only detects positive peak (simultaneously ignoring negative peak), alternatively, can be the all-wave variant simultaneously detecting positive peak and negative peak.In other words, broadly say, envelope detector 689 can by except describe except other modes implement.

By (inputting contrary with this grid that exports to of more directly coupling audio amplifier 688) between the grid input of envelope detector 689 being inserted the output of audio frequency amplifier 688 and the MOSFET of controllable attenuator 686, avoid decay controllable attenuator 686 being provided and the signal provided the microphone that passes through from the talk with each positive peak occurred in the output of audio frequency amplifier 688 is provided.On the contrary, controllable attenuator 686 is occurred wherein, and the time period that multiple peak value exceedes the intended threshold level of the output of audio frequency amplifier 688 provides decay in a more continuous fashion, and after such period in the past, only stop providing decay (threshold value is at least in part by the voltage drop setting of the forward bias voltage at the diode two ends of the threshold voltage of the grid of the MOSFET of controllable attenuator and the envelope detector 689 in the particular implementation of shown envelope detector 689).Show by this way in the process of its behavior making controllable attenuator 686, those of ordinary skill in RC circuit is easily recognized, envelope detector 689 response occurs that the time delay (" start-up time ") of the peak value (first peak value of isolated peak or multiple adjacent peak) exceeding predetermined threshold must by the capacitance settings of the resistance of the first resistor and capacitor.Further, capacitor fully exhausts the required time (also referred to as " die-away time ") making MOSFET not reoffer voltage triggered decay and must be set by the resistance of the electric capacity of capacitor and the second resistor.Therefore, the selection of the electric capacity of capacitor and the resistance of the first resistor and the second resistor determines the behavior that envelope detector 689 and controllable attenuator 686 cooperate the compressor reducer function caused.

Envelope detector 626 be by diode, resistor and capacitor formed to be coupled with the mode describing basic simlarity about envelope detector 689 (but, as the situation in envelope detector 689, envelope detector 626 can be implemented in several ways, includes source circuit).But, replace the signal peak being used for integration audio frequency amplifier 688 output, the signal peak that envelope detector 626 exports for integration communication microphone 125, as envelope detector 626 is received by differentiating amplifier 625.As discussed previously, what be considered to best practices is any coupling of the position of the audio devices (that is, audio devices 9000) realizing any communication type that microphone bass or microphone high pitch wire and ground are only coupled to by connector at earphone 1000a.Therefore, the positive input of coupled differential amplifier 625 and negative input and microphone bass and microphone high pitch wire can its any signals delivered of tap, and wherein arbitrary position at voicefrequency circuit 600 can not be caused to be coupled to ground (ultra-high-impedance utilizing typical differentiating amplifier).But, those of ordinary skill in the art easily recognizes, the single-ended variant of use amplifier replaces differentiating amplifier 625, may be not unimaginable to the single ended input of such amplifier together with microphone bass signal coupling extremely the simultaneously microphone high pitched signal that is coupled in voicefrequency circuit 600.

The output of the integration performed by envelope detector 626 is coupled to the gain input of voltage controlled avalanche oscillator 687, thus allows the signal of the integration of the signal peak representing the audio frequency detected by communication microphone 125 to be used to optionally reduce the signal gain being supplied to the sound of the input of audio frequency amplifier 688 representing and detected by current microphone 185 of talking.Should be noted that, although what describe is the mechanism using the attenuator of independent from audio frequency amplifier 688 and different parts to be used as can reduce gain under the control of envelope detector 626, but also can be other embodiments, wherein the gain of audio frequency amplifier 688 is controllable and envelope detector 626 is more directly coupled to audio frequency amplifier 688 (that is, with the gain control inputs being coupled to audio frequency amplifier 688 in some manner) thus uses audio frequency amplifier 688 to reduce gain.Describe in fact to realize the independence of gain reduction at least in part and different parts, thus illustrate and to mean in gain reduction and to perform under the control of envelope detector 626, instead of gain increases.

In this way, when the gain reduction of the link between the differential signal activity that microphone bass and microphone high pitch wire two ends occur and current audio frequency of talking is formed as making to speak as the user of earphone 1000a, represent gain reduction a period of time of the signal of the sound detected by current microphone 185 of talking, this time, from start-up time, is being terminate the die-away time controlled at least in part by the electric capacity of the capacitor of envelope detector 626 and the resistance of resistor.Therefore, open loop compressor reducer is formed by the interaction implemented between the envelope detector 626 of this link and voltage controlled avalanche oscillator 687.Which solve no matter when user speaks, the user of earphone 1000a listens the sound of oneself to be greater than the problem of normal degree by the talk of earphone 1000a function of passing through.Be familiar with the physiology of human language and the people of acoustics will easily recognize, hear that when people speaks its oneself voice are very normal, part due to voice by Eustachian tube, osteoacusis and by other structures in neck and head from internal delivery to people's ear; And partly because voice (supposes that the entrance arriving its duct is not capped) near transfer of air to two ear near its mouth.But, although user hears that itself to mention such degree very normal, but the talk of earphone 1000a is passed through, function probably causes the sound of user oneself to be passed to its ear with factitious high amplitude and/or with change that is unhappy and/or some other mode distractive, coverage user is expected other sound (that is, the sound of another person) heard.

Further, depending on that current microphone 185 of talking has much relative to the position near the mouth of user and/or user sound of speaking, the voice of user oneself can be detected as fully loud by the current microphone 185 of talk, what make audio frequency amplifier 688 causes in the amplification of normal gain level the compression function triggering and provided by the combination of envelope detector 689 and controllable attenuator 686.Therefore, replace user with factitious loud and/or heard the problem of its oneself sound by factitious mode in other modes of current function of talking, may exist user's experience speaking as user and piping down user duration lasts die-away time of compression function after moment time talk to pass through the problem of momentary loss of function.Depend on the length of die-away time, this can actually by no matter when user speak and after user pipes down during some extra time period (that is, die-away time) cause user can not hear other people what is said and stop user and other people talk.In fact, such as, the user of earphone 1000a can ask other people problem, but can not hear itself ask questions or at least other people answer beginning.To speak the gain of the signal representing the sound detected by current microphone 185 of talking by reducing the user to no matter when being supplied to audio frequency amplifier 688, current function of talking maintains on the gain level of reduction, and prevent user from hearing it arrives at the naturally loud sound of level and the output of prevention audio frequency amplifier 688 amplitude triggering compression simultaneously.

In order to increase by the open loop compressor reducer be combined to form of envelope detector 626 and voltage controlled avalanche oscillator 687 thus effectively prevent the closed loop compressor reducer be combined to form that triggers undesirably by envelope detector 689 and controllable attenuator 686, by the start-up time that must be shorter than the start-up time of the open loop compressor reducer be combined to form of envelope detector 626 and voltage controlled avalanche oscillator 687 by the closed loop compressor reducer be combined to form of envelope detector 689 and controllable attenuator 686.But preferably, open loop compressor reducer general work must be faster than this closed loop compressor reducer, therefore, has choosing, be also shorter than the die-away time of this closed loop compressor reducer the die-away time of this open loop compressor reducer.

In pulse attenuator 680, current microphone 185 of talking is coupled in the input of amplifier of microphone 684, with the signal that represent sound after testing of tap from current microphone 185 of talking, because those signal-selectivity ground are passed to controllable attenuator 686 by analog switch 681.As depicted, the input of amplifier of microphone 684 is not be coupled to the current microphone 185 of talking (input as audio frequency amplifier 688 is coupled to current microphone 185 of talking by capacitor AC) by capacitor AC, but other embodiments can be such.Capacitor is coupled in the output of amplifier of microphone 684, and capacitor is coupled to the first input and resistor of comparator 683 further simultaneously, and resistor is coupling to ground further.Capacitor and resistor cooperation form high pass filter, the signal of the output from amplifier of microphone 684 of the sound (that is, having the sound of the frequency being greater than concrete preset frequency) of expression higher frequency is only allowed to pass through and arrive the first input of comparator 683.Second input of comparator 683 is coupled to voltage source, the further coupling grounding of voltage source.Voltage source provides reference voltage level to comparator, and voltage level high pass filter being supplied to the signal of comparator 683 is compared with this reference voltage level.The input that can trigger monostable multivibrator 682 is again coupled in the output of comparator 683, and the grid input of the MOSFET of pulse attenuator 680 is coupled in the output that can trigger monostable multivibrator again.MOSFET is coupling to ground the control inputs with analog switch 680 further, thus can trigger the control inputs of this analog switch 681 optionally ground connection under the control of the output of monostable multivibrator 682 again.Cause analog switch 681 to open by the control inputs of analog switch 681 described in MOSFET ground connection, the signal thus interrupting the current microphone 185 of talk exports and controllable attenuator 686 being coupled by analog switch 681.

Amplifier of microphone 684, comparator 683, the signal that monostable multivibrator 684 and miscellaneous part cooperation monitoring export by current microphone 185 of talking can be triggered again, the input of the controllable attenuator 686 of current microphone 185 to talk pass circuit 680 and control simulation switch 681 is talked to be optionally coupled.Therefore, pulse attenuator 680 is still to another circuit worked from the audio signal that current microphone 185 of talking receives by audio frequency amplifier 680.A little as the compressor reducer formed by envelope detector 689 and controllable attenuator 686 cooperation, current audio frequency of talking monitored by pulse attenuator 680, and works in response to the specified conditions detected in the signal of the current audio frequency of expression talk.But pulse attenuator 680 works quickly than compressor reducer, and responds different condition.By using the envelope detector 689 that there is start-up time and be selected as the peak value of integration audio frequency die-away time, thus avoid each independent peak value of response to provide compression, closed loop compressor reducer is only compressed in talk that the duration has a too high amplitude of multiple peak value is passed through audio frequency, therefore, the specific features of the single peak value (just and/or negative) of the sound that current microphone 185 of talking detects can not be responded fast enough, thus avoid allowing single peak value to be amplified by audio frequency amplifier 688 and totally tansitive to the ear of the user of earphone 1000a.

Pulse attenuator 680 is by using the high pass filter formed by resistor and capacitor to solve this inefficiency problem, this resistor and capacitor-coupled input to first of comparator 683 with the effect playing differentiator, select resistance value with capacitance can detect the beginning of the single peak value wherein starting the relative Rapid Variable Design rate with the voltage level exceeding predefined speed.In addition, the voltage level that when such comparator 683 detect beginning exceedes predetermined voltage level.Particularly, differentiator forms differentiator and comparator combination in described mode in conjunction with described comparator, and this combination detects the beginning of positive peak with relative fast rise time (not being relative voltage level negative sense rate of change fast).Using this differential with in the process compared, the peak value supposing to have the beginning of the relative fast rise time having simultaneously and exceed the predetermined rise time and the voltage level exceeding predetermined voltage level will be the final peak value arriving amplitude (that is, voltage level) too high undesirably.In other words, although envelope detector 689 Integrated peak, thus the more long-period event (therefore needing the peak value of multiple amplitude too high undesirably to occur before testing) expecting more high amplitude with compression ratio can be detected, but the combine detection of differentiator and comparator seems to be likely and will arrive the beginning of undesirably crossing high amplitude ground peak value, thus can take action before in fact it arrive.In essence, the such peak value of prediction attempted by pulse attenuator 680, should can first make sound.

Again, should be understood that, the variant of differentiator and comparator circuit is also passable, replaces or except the beginning detecting such positive peak, will detect the beginning with the negative peak of voltage level negative sense rate of change relatively fast and voltage level and where exceed the amplitude of predetermined negative voltage level.Therefore, this pulse attenuator 680 describe variant and should be considered as only example and implement, can be considered as in some situation more expecting to implement a kind of pulse attenuator 680, (namely its response undesirably crosses the positive peak of high amplitude or negative peak, the peak value crossing high amplitude of the voltage level of final arrival positive voltage level or negative voltage level) beginning, way is that no matter, it is that situation of negative sense rate of change or positive change rate is by detecting the high rate of change that exceedes the voltage level of predetermined variation rate and being no matter positive voltage level or the situation of negative voltage level is by detecting the predetermined voltage level exceeded relative to reference ground level.

In the enforcement of described pulse attenuator 680, to the response of the beginning seemingly such (just) peak value being detected be: by the current microphone 185 of talk from controllable attenuator 686 (therefore, pass through microphone 185 of final talk disconnected with the moment of the input of audio frequency amplifier 688) moment of signal of exporting disconnect (effectively downward be compressed to instantaneously zero or close to zero amplitude), thus stop the peak value of (just) predicted to be passed to audio frequency amplifier 688 like this, make it forever can not be passed to the ear of the user of earphone 1000a.But, should be noted that, other enforcements of pulse attenuator 680 are also fine, wherein response compresses instantaneously in less degree, make the peak value amplitude in predetermined limits can being heard predicted (just), instead of disconnect (that is, be compressed to instantaneously zero or close to zero amplitude) downwards instantaneously.

But, (namely in fact pulse attenuator 680 implemented, no matter it detects or both beginnings in plus or minus peak value, preferably be chosen as enough fast in their operations at any parts implementing to use in the process of pulse attenuator 680, to such an extent as to analog switch 681 (or in other are implemented its equivalent) will enough operate rapidly, thus the peak value of prediction is prevented to be passed to the input of audio frequency amplifier 688.Therefore, preferably, pulse attenuator 680 have relatively fast so-called " start-up time ", the start-up time of the compressor reducer particularly formed with controllable attenuator 686 cooperation with envelope detector 689 is compared.Duration of disconnecting the instantaneously compression of less degree (or in the enforcement that other are possible) will be set as determining with the time period of signal driven MOS FET by triggering monostable multivibrator 682 (or in other are implemented its equivalent) again, and described driving makes MOSFET operation simulation switch 681 open to interrupt to talk the coupling of current microphone 185 and controllable attenuator 686.Can trigger monostable multivibrator 682 again and be preferably set to predetermined amount of time, described predetermined amount of time is selected for tight fit and expects from expecting that the sound detected by current microphone 185 of talking produces and expects the expected duration of at least one peak value blocked.Desirably, it is almost the effect that the independent peak value of such peak value arrives audio frequency amplifier 688 that pulse attenuator 680 plays obstruction, thus is minimized in the interruption be passed to by other the current audio sounds of talking from current microphone 185 of talking in the process of audio frequency amplifier 688.Therefore, further preferably, pulse attenuator 680, with same so-called " die-away time " action relatively fast, is particularly compared with the die-away time of the compressor reducer formed with controllable attenuator 686 cooperation by envelope detector 689.Finally, by current microphone 185 of talking, the user being intended that earphone 1000a can hear that another person speaks, and only experience brief interruption in the process of speaking listening other people, described interruption is necessary to stop the sound with the peak value of less desirable high amplitude to be passed to user's ear through audio frequency amplifier 688 and acoustic driver 115.

In fact, to to have faster than the startup of envelope detector 689 with the start-up time of die-away time with die-away time so that play that to stop the sound of user oneself may trigger out the envelope detector 626 of compression (by the cooperation of envelope detector 689 with controllable attenuator 686) similar as previously discussed, preferably, the start-up time of pulse attenuator 680 and die-away time are also enough fast, can similarly stop have similar single cross high amplitude peak value (namely, prediction arrive just too high/or the peak value of negative amplitude) the talk sounds trigger that microphone 185 detects of passing through go out compression.In other words, just as desired, such peak value of such sound arrives audio frequency amplifier 688 never, thus avoid it be exaggerated and be passed to user's ear, it is also contemplated that, such peak value of such sound arrives audio frequency amplifier 688 never, thus avoids allowing the peak value of amplification form arrive envelope detector 689 with the capacitor fully charged wherein to trigger compression.When not comprising pulse attenuator 680, there is following possibility: having the single sound crossing the peak value of high amplitude can be detected by the current microphone of talk, then amplified by audio frequency amplifier 688 and forming by envelope detector 689 and controllable attenuator 686 cooperation the ear acoustically being exported to user before compressor reducer can respond by acoustic driver 115, but have sufficiently high amplitude make individual pulse can fully charge envelope detector 689 capacitor and trigger compression like this, making current function of talking has been deprived of for the time period user represented by start-up time of envelope detector 689 and die-away time---this result cannot provide the protection of the peak value to talk traffic sounds for user, and cause extraly user in the brief time after this peak value can not hear near other people content of saying.

An embody rule of the earphone 1000a considered is that infantry personnel have the battlefield surroundings of gunshot and explosive sound in expection.Special concern be when utilizing earphone 1000a infantry personnel to trigger the rifle of oneself.The communication microphone 125 of previously described noise cancelling microphone will attempt the gunshot of refusal from the rifle of user, can not be like this but talk current microphone 185.Analyze typical gunshot to show, gunshot forms (namely by the peak value subsequently of the amplitude and then greatly reduced after the initial spike of unusual high amplitude, the high attenuation rate of amplitude is there is after initial spike), what make to cause maximum worry is initial high amplitude peak value.The compressor reducer formed by envelope detector 689 and controllable attenuator 686 cooperation will fully respond lentamente, to such an extent as to will such peak value be allowed before compressing to be passed to acoustic driver 115 from the current microphone 185 of talk by audio frequency amplifier 688, but, such peak value will probably have sufficiently high amplitude, and some time period in fact after such peak value triggers the compression to sound (comprising the sound irrelevant with gunshot) subsequently.

But, pulse attenuator 680 in position time, the beginning of initial spike is received from the current microphone 185 of talk by amplifier of microphone 684, and amplifies before being supplied to the high pass filter formed by resistor and capacitor, is then supplied to comparator 683.Suppose the rate of change starting to have the predetermined variation rate exceeding voltage level of initial spike, high pass filter allows current exaggerated first input starting to be passed to comparator 683 of initial spike, in comparator 683, it is compared by with predetermined voltage level, and described predetermined voltage level inputs at second of comparator 683 reference voltage level provided by reference voltage source and sets.That supposes the current amplification of initial spike begins to exceed predetermined voltage level, comparator 683 triggers can trigger monostable multivibrator 682 again, the grid of its driven MOS FET is inputted, make for triggering the control inputs of the predetermined amount of time MOSFET coupled simulation switch 681 that monostable multivibrator has set again to ground, thus interrupt the final coupling sufficiently long time of the input of the current microphone 185 of talk and audio frequency amplifier 688, thus stop initial spike to arrive audio frequency amplifier 688.

As its name, monostable multivibrator 682 can be triggered again can " be triggered ", made before current generation such a time period terminates in response to the beginning another peak value with aforementioned essential feature being detected, period can be restarted, the described period is its period being set to cause analog switch 681 to open (by driven MOS FET, as has been described).Therefore, if (namely existence has an example of the first peak value of preceding feature, the initial spike of the first gunshot) be and then an example of second peak value also with preceding feature (namely, the initial spike of the second gunshot), the action making the predetermined amount of time that can trigger monostable multivibrator 682 again respond the beginning of the first peak value does not also terminate, and so the beginning of response second peak value restarts by predetermined amount of time in the middle of the predetermined amount of time of current generation.Therefore, monostable multivibrator can be triggered again and cause the time quantum that analog switch 681 interrupts the coupling of the current microphone 185 of talk and audio frequency amplifier 688 to extend, thus avoid the first peak value or peak value to be subsequently passed to the input of audio frequency amplifier 688.Although wherein can trigger again monostable multivibrator 682 by some other forms of can not triggered timing mechanism replace embodiment also passable, preferably retriggerable timing device.Get back to infantry scenario, the timing device of activation pattern again pulse attenuator 680 can will be allowed to adapt to infantry's shooting " machine gun " better or shoot other full automatics of series of cartridges in rapid succession, make to occur quick continuous print gunshot, each gunshot has such initial spike crossing high amplitude.Detect the beginning of each such peak value, monostable multivibrator can be triggered again triggered again thus repeatedly extend the described time period, can trigger monostable multivibrator 682 again in this time period causes analog switch 681 (passing through MOSFET) to stay open, so that stop all such peak values in quick continuous print gunshot to be passed to the input of audio frequency amplifier 688.

The part of another possibility variant of the electronic architecture 2000a introduced in Fig. 3 depiction 2a and 2b.This variant is different from the variant described in Fig. 2 a and 2b, and current function of wherein talking is in conjunction with ANR function.In addition, for simplicity, the parts of the voicefrequency circuit 600 be only associated with an earplug 110 (therefore, only having an acoustic driver 115) are described.In view of the extensive treatments providing many implementation details about Fig. 2 a and 2b, such details repeats no more in figure 3, and therefore, Fig. 3 presents the description of higher level.

Describe about Fig. 2 b and discuss, voicefrequency circuit 600 comprises differentiating amplifier 625, pulse attenuator 680, talk pass circuit 685 and envelope detector 626.But, as also described, be different from about Fig. 2 b describe and discuss, voicefrequency circuit 600 comprises summing junction 615, pulse attenuator 690 and ANR circuit 695 further.A feedforward microphone 195 is coupled in the input of pulse attenuator 690, and ANR circuit 695 is coupled in its output.And then ANR circuit 695, as talk pass circuit 685, is coupled to envelope detector 626 thus receives the integral result to the amplification form representing the signal of sound detected by communication microphone 125.Further, summing junction 615 inserts between the output of acoustic driver 115 and talk pass circuit 685 and ANR circuit 695, thus these is exported in the individual signals be attached to by its driving acoustic driver 115.

The those of ordinary skill being familiar with ANR will be recognized, need to utilize one or more microphone to detect less desirable noise, generation anti-noise sound, then in position acoustically export those anti-noise sound based on feedback and the ANR based on feedforward form, choose the right moment to cause the acoustic interference that disappears mutually to undesirably noise simultaneously, thus at least reduce its acoustic magnitude.In the embodiment that earphone 1000a comprises based on the ANR of feedforward, at least one feedforward microphone 195 is performed by the part of earphone 1000a, make it be acoustically coupled to the environment of the volume outside closed by earphone near people's ear 110, thus detect the less desirable noise in external environment condition.ANR circuit 695 receives the signal of telecommunication representing the noise detected, and uses this noise as producing the reference sound being supplied to the anti-noise sound of acoustic driver 115 (by summing junction 615) thus.

Be not as previously discussed compress under the control of envelope detector 626 from the talk in talk pass circuit 685 pass through microphone 185 receive signal, similarly, ANR circuit 695 compresses the signal that feedback microphone 195 in the past receives under the control of envelope detector 626.The gain that the user of response earphone 1000a speaks and reduces the signal representing the noise detected by feedforward microphone 195 may be considered to expect, as the situation of current function of talking, can avoid the voice of user oneself with cross high amplitude and/or other not natural trend features convey to the ear of user oneself.Although commonly, wherein use many audio frequency ranges of ANR to a great extent lower than the frequency range be associated with people's voice, between these two scopes, there is the overlap of some degree.Result, the voice (particularly having the user of deep sound) of the user of the communication headset 1000 detected by feedforward microphone 195 can be treated to less desirable ambient noise by ANR circuit 695, and produce for it anti-noise sound that acoustic driver 115 is acoustically exported.Mean that the acoustics of this anti-noise sound of the more low frequency part that will reduce its voice exports and may produce undesirably acoustic phenomenon user being felt under the weather or diverts one's attention.The gain reducing the signal representing the noise detected by feedforward ANR microphone 195 when a user speaks keeps the ANR function of at least some degree, reduces at least based on the amplitude of the anti-noise sound of such voice simultaneously.

Be coupled to by pulse attenuator 680 current microphone 185 of talking as talk pass circuit 685 the same, ANR circuit 695 is coupled to by pulse attenuator 690 microphone 195 that feedovers.Pulse attenuator 690 is preferably substantially identical with pulse attenuator 680, and performs identical function.Although ANR circuit 695 is attempted using the noise comprising single too high amplitude peak detected by feedforward microphone 195 to produce anti-noise sound, when doing like this, ANR circuit 695 can fail to produce the distortion anti-noise sound with too high amplitude peak in the process of counteracting initial noisc.The those of ordinary skill be familiar with based on the ANR of feedforward is easily recognized, there is the sound of abundant high amplitude, very possible feedforward microphone 195 is no longer linear behavior, therefore, attempts producing the anti-noise sound with such high amplitude peak value and probably in fact produces more noises.Further, there is nothing different from the closed loop compressor reducer in talk pass circuit 685, all think that probably the interior corresponding compressor reducer of ANR circuit 695 can not occur this situation to stop by fast-acting.Therefore, corresponding pulse attenuator 690 is comprised.

Although it should be noted that talk current microphone 185 and feedforward ANR microphone 195 are depicted as is independent and different microphones, alternate embodiment is fine, wherein share microphone replace both thus provide public sound detection to input for two functions.Owing to talking, both current microphone 195 and feedforward ANR microphone 195 are acoustically coupled to external environment condition, because both are not preferably that noise eliminates the microphone of type to such an extent as in fact both can detect far field sound and (be different from the previously discussed microphone 125 that communicates with near field sounds, the noise while that it being configured to detect near field sounds, certain degree being ignored far field sound eliminates the microphone of type), more than substitute and be fine.Whether this structure depending on communication headset at least in part exists the one or more positions can locating single microphone (surrounding the external environment condition of earphone 1000a and the head of its user so that be acoustically coupled to), it allows to detect external voice to all effective mode of two functions.If should, it is further noted that use single such microphone, then only need individual pulse attenuator to insert single microphone and talk pass circuit 685 and ANR circuit 695 between the two.

In addition, it should be noted that in order to visually for purpose of brevity, only describe single acoustic driver 115 and its associated circuits in voicefrequency circuit 600 (that is, talk pass circuit 685 and ANR circuit 695).Therefore, have in the embodiment of a pair earplug 110 at communication headset 1000, there is a pair acoustic driver 115, each acoustic driver has be associated talk pass circuit and the ANR circuit that is associated in a pair ANR circuit 695 be coupled on it in a pair talk pass circuit 685, and single envelope detector 626 will be coupled to each talk pass circuit 685 and each ANR circuit 695.

The variant of operable voicefrequency circuit 600 in the earphone 1000b operable electronic architecture 2000b of Fig. 4 a and 4b depiction 1b and electronic architecture 2000b.In Fig. 4 a and 4b describe and describe mode be in order to respectively with Fig. 2 a and 2b basic simlarity.In fact, as depicted, electronic architecture 2000b and electronic architecture 2000a basic simlarity, especially, many aspects basic simlarity of two framework sound intermediate frequency circuit 600, and work in a substantially similar manner.But, electronic architecture 2000b and the Main Differences of electronic architecture 2000a lack communicate microphone and other holding componentss for implementing two-way communication in electronic architecture 2000b, reflects earphone 2000a support bidirectional audio communication and earphone 2000b does not support this fact of bidirectional audio communication.Another essence difference is in the head assembly 100 that is jointly positioned in earphone 1000b of control circuit 700 and voicefrequency circuit 600, thus no longer needs independent control box 300 and the upper cable 200 of the earphone 1000a in earphone 1000b.

Therefore, the microphone bass and the microphone high pitch wire that are depicted as the part of the electronic architecture in Fig. 2 a-2b do not exist in electronic architecture 2000b, therefore no longer describe in Fig. 4 a-4b.Pulse attenuator 680 is only depicted as box-like in fig. 4b, because probably implement with the mode of the mode basic simlarity described about Fig. 2 b.In contrast, describe talk pass circuit 685 in more detail in fig. 4b, thus clearly describe the variant lacking the talk pass circuit 685 described in voltage controlled avalanche oscillator 687 and Fig. 2 b.

Other embodiments and execution mode all can be endowed in the protection range of other rights of right in claim and applicant.

Claims (19)

1. one kind controls by the method for the acoustic driver in the housing of the earplug being arranged on earphone at the sound acoustically exported, comprise: exceed predetermined voltage level and the beginning with peak value in the signal of the voltage level change rate exceeding predetermined variation rate in response to detecting, and the described signal of sound that compression expression is detected by the microphone of described earphone in the external environment condition being acoustically coupled to described housing.

2. method according to claim 1, wherein compresses described signal and comprises the input stoping described peak value to be passed to the parts of described earphone.

3. method according to claim 2, the input wherein stoping described peak value to be passed to parts comprises console switch to disconnect described signal from the input of amplifier.

4. method according to claim 1, wherein compresses described signal and comprises Signal Compression predetermined amount of time.

5. method according to claim 4, wherein said predetermined amount of time is retriggerable.

6. method according to claim 5, wherein selects described predetermined amount of time to compress the peak value be associated with gunslinging sound.

7. method according to claim 1, wherein selects at least one peak value be associated with gunslinging sound with compression in described predetermined voltage level and described predetermined variation rate.

8. method according to claim 1, wherein said microphone is that the talk of described earphone is passed through microphone.

9. method according to claim 1, comprises further: in response to detecting by the voice being arranged on the user eliminating the described earphone that communication microphone detects towards the noise on the described earphone near the mouth of described user, and reduce the gain of described signal.

10. an earphone, comprising:

First earplug, comprising:

First housing; And

Be arranged on the first acoustic driver wherein;

To be carried by the structure of communication headset and at the first microphone being acoustically coupled to described first outside environment;

Be coupled to the voicefrequency circuit of described first acoustic driver and described first microphone, described voicefrequency circuit receives the signal that represents the sound detected by described first microphone and provides and exports described first acoustic driver to; And

Wherein said voicefrequency circuit exceedes predetermined voltage level and the beginning with peak value in the signal of the voltage level change rate exceeding predetermined variation rate in response to detecting, and compresses described signal.

11. earphones according to claim 10, wherein said voicefrequency circuit compresses described signal and comprises: the first component of described voicefrequency circuit stops peak value to be passed to the input of the second component of described voicefrequency circuit.

12. earphones according to claim 11, comprise further as the switch of described first component and the amplifier as described second component, wherein compress described signal and comprise the described switch of operation to disconnect described signal from the input of described amplifier.

13. earphones according to claim 10, wherein said voicefrequency circuit compresses described signal and comprises described voicefrequency circuit by described Signal Compression predetermined amount of time.

14. earphones according to claim 13, comprise further and can trigger monostable multivibrator again, it can be set predetermined amount of time, described signal can be operated to be compressed described predetermined amount of time and can be triggered again to restart described predetermined amount of time in the middle of described predetermined amount of time.

15. earphones according to claim 14, wherein select described predetermined amount of time to compress the peak value be associated with gunslinging sound.

16. earphones according to claim 10, wherein select at least one peak value be associated with gunslinging sound with compression in described predetermined voltage level and predetermined variation rate.

17. earphones according to claim 10, wherein said first microphone is current microphone of talking, and described voicefrequency circuit comprises talk pass circuit.

18. earphones according to claim 10, comprise communication microphone further, it locates relative to described first housing and is coupled to described voicefrequency circuit near the mouth of the user of described earphone, wherein said communication microphone is noise cancelling microphone, and wherein said voicefrequency circuit reduces the gain of described signal in response to the voice example user of described communication headset being detected by described communication microphone.

19. earphones according to claim 10, comprise further:

Second earplug, comprising:

Second housing; And

Be arranged on the second acoustic driver wherein;

Carried by the structure of described communication headset and be acoustically coupled to the second microphone of environment of described second outside;

Wherein said voicefrequency circuit is coupled to described second acoustic driver and described second microphone, and described voicefrequency circuit receives another signal of representing the sound detected by described second microphone and provides and exports described second acoustic driver to; And

Wherein said voicefrequency circuit exceedes predetermined voltage level and the beginning with peak value in other signals of the voltage level change rate exceeding predetermined variation rate in response to detecting, and compression other signals described.