CN106251878A - Meeting affairs voice recording device - Google Patents
Meeting affairs voice recording device Download PDFInfo
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- CN106251878A CN106251878A CN201610743364.8A CN201610743364A CN106251878A CN 106251878 A CN106251878 A CN 106251878A CN 201610743364 A CN201610743364 A CN 201610743364A CN 106251878 A CN106251878 A CN 106251878A
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- 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
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Abstract
In order to improve the active noise reduction accurate scope control ability in recording application and recording tonequality, the invention provides a kind of meeting affairs voice recording device, including: meeting-place noise detection unit, voice recording unit, active noise eliminates unit, described meeting-place noise detection unit is for detecting the decibels of meeting-place noise, described active noise eliminates unit and determines whether the noise including mobile noise source and fixed noise source is carried out active noise reduction according to this decibels, the notification message that described voice recording unit eliminates unit according to described active noise carries out voice recording.The meeting affairs voice recording device of the present invention can carry out active noise reduction to the noise source of autonomous, provides solid foundation for the noise reduction technology in terms of various Speech processing of the prior art, provides solid guarantee for the final tonequality recorded.
Description
Technical field
The present invention relates to noise reduction technology field, more particularly, to a kind of meeting affairs voice recording device.
Background technology
Active noise reduction, refers to gather environmental noise, and produces the signal denoising device playback anti-phase with noise, in order to support
The technology of noiseless.The noise reduction system of typical case's active noise reduction (ANC) earphone is made up of following part: 1) in order to gather the wheat of noise
Gram wind system；2) Electronic Control part, in order to process acoustical signal, and generates de-noising signal；3) horn system, in order to produce fall
Noise tone signal.One in major part ANC system two kinds of primary structures of employing: feed forward type or reaction type.Such as, prior art
In, such as Japanese patent application publication No. JP078558A discloses a kind of comfortable sleeping equipment, including: it is located at head both sides for supervising
Survey the first acoustic pressure monitor of environment acoustic pressure, for monitoring the second acoustic pressure monitor of residual acoustic pressure near ear, for calculating
One computing unit of acoustic signals and send the generation equipment of this acoustic signals.Environment noise can by acoustic signals offset from
And reach the purpose of noise reduction, and the residual acoustic pressure near the second acoustic pressure monitor monitoring ear, sound wave letter can be calibrated further
Number to improve noise reduction.Although the acoustic signals of noise reduction can be calibrated by the second acoustic pressure monitor, so that the second acoustic pressure prison
The acoustic pressure surveying device position is down to minimum.
Existing active noise reduction techniques scheme focuses primarily upon the noise how offsetting stationary sound source.Such as, Application No.
CN201510761883.2 discloses a kind of multi-person synergy recording system based on instant messaging, including collaborative recording module, disappears
Breath processing modules etc., by means of voice de-noising technology.But, in the occasion that some expectation recording quality is higher, such as some is recorded
Read far reaching meeting or meeting-place, it may be desirable to the noise that the noise source wherein moved produces effectively can be located
Reason, especially has portable noise source and fixed noise source and in them in the environment of the echo of at least one.
Summary of the invention
In order to improve the active noise reduction accurate scope control ability in recording application and recording tonequality, the invention provides
A kind of meeting affairs voice recording device, including: meeting-place noise detection unit, voice recording unit, active noise eliminate unit, institute
Stating meeting-place noise detection unit for detecting the decibels of meeting-place noise, described active noise eliminates unit according to this decibels
Determine whether the noise including mobile noise source and fixed noise source is carried out active noise reduction, described voice recording unit
The notification message eliminating unit according to described active noise carries out voice recording.
Further, described active noise elimination unit includes: interaction interface unit, the first noise reduction unit and second
Noise reduction unit, wherein said interaction interface unit is connected with the first noise reduction unit and the second noise reduction unit respectively, described alternately
Interface unit controls described first when the decibels detected according to described meeting-place noise detection unit exceedes predetermined threshold value
Noise reduction unit and/or described second noise reduction unit carry out active noise reduction, and described first noise reduction unit is for mobile noise source
Noise carries out active suppression, and the noise of the noise reduction unit of the described fixed noise source noise source for absolutely not becoming position enters
Row active suppression, fixed noise source described in the absolute invariant representation in described position is fixed in locus, somewhere and this position not
Change over.
Further, described first noise reduction unit includes:
First Noise Acquisition and position associative cell, including the first Noise Acquisition subelement, the first echo obtain subelement,
First electronic chart obtains subelement, the first mark object obtains subelement and associates subelement with primary importance, and wherein said the
One Noise Acquisition subelement is for gathering on described equipment other directions outside the direction of expectation recording in the m-th moment
The noise signal of the whole noise sources in the first surrounding preset range, described first echo obtains subelement for described first
After Noise Acquisition subelement completes above-mentioned collection, launch ultrasonic signal to described first surrounding preset range and to gather this ultrasonic
The echo of ripple signal, described first electronic chart obtains subelement for obtaining predetermined model around described the first of m-th moment
Enclose interior, include the electronic chart can taken action including routing information；Described first mark object obtains subelement for based on institute
State electronic chart and obtain the mark on path, that be identified on described electronic chart of respectively can taking action of routing information instruction of can taking action
Knowing, described primary importance association subelement is for the mark determined according to described first mark object acquisition subelement, based on institute
State the first echo and obtain each noise source that the echo-signal of each noise source that subelement determines determines relative to described meeting affairs voice
The direction of recording device and distance, set up the pass of mapping one to one between each mark on each noise source and electronic chart
System, described M is positive integer；
Removable noise source screening unit, within Z the moment before the Q moment, gathers described whole noise
The change in location information in source, to remove the noise source that position does not changes within this Z moment from described whole noise sources,
The residual noise source in described whole noise source is made to constitute alternative mobile noise source collection；
Specific removable noise source collection determines unit, for being set by band segment interested in described whole noise signals
For particular noise signals, concentrate from described alternative mobile noise source and determine that sending at least one of this particular noise signals moves and make an uproar
Sound source, the most specific removable noise source collection；
Can take action path acquiring unit, predetermined for obtaining around the second of described meeting affairs voice recording device position
In the range of taken action routing information, and before the n-th moment, gather described specific removable noise source collection when n-th
Carve front P the moment primary importance information collection and before the n-th moment collection meeting affairs voice recording device when n-th
The second position information collection in front P the moment carved, described routing information of taking action includes road information, wherein N-M > P, and N and P
Being positive integer, described second surrounding preset range belongs to a part for described first surrounding preset range；
Noise source path determining unit, for the taken action routing information obtained according to described path acquiring unit of taking action
And primary importance information collection, each determining by the way of matching that this specific removable noise source collection includes is specific removable
Noise source the N+1 moment relative to the first estimating position information collection in described path of taking action, described first estimating position
Information collection includes each specific removable noise source estimating position information N+1 moment；
Meeting affairs voice typing device path determines unit, feasible for obtain according to described path acquiring unit of taking action
Dynamic routing information and second position information collection, determine that by the way of matching described meeting affairs voice recording device is at N+1
Moment is relative to the second estimating position information in described path of taking action；
Removable noise reduction starts judging unit, and first for obtaining according to described noise source path determining unit estimates position
Confidence breath collection, calculates each specific removable noise source of including at removable noise source collection specific described in the N+1 moment
At least one difference between second estimating position information of position and described meeting affairs voice recording device, determines this at least one
Comparative result between difference and predeterminable range difference, will be less than described in predeterminable range difference with threshold distance according to this comparative result
The specific removable noise source that specific removable noise source is concentrated is defined as treating the removable noise source of active noise reduction；
First direction adjustment unit, treats the removable of active noise reduction described in concentrating based on the first estimating position information
Noise source at the position in N+1 moment and described meeting affairs voice recording device at second estimating position in N+1 moment
Information, determines that described in the collection of described second Noise Acquisition unit, sound passes when the noise of the removable noise source of active noise reduction
Sensor towards angle；
Second Noise Acquisition unit, including multiple sound transducers, described second Noise Acquisition unit is for according to described
The removable noise controlling to treat described in described sound transducer collection active noise reduction towards angle that first direction adjustment unit determines
The noise signal in source, treat described at least one the noise signal of the removable noise source of active noise reduction constitute treat active noise reduction can
Mobile noises from noise sources collection；
First suppression frequency spectrum signal generating unit, for according to treat that the removable noises from noise sources collection of active noise reduction relates to each
The noise signal of the described removable noise source treating active noise reduction, produces the first anti-phase noise signal collection accordingly, and this is first anti-
Phase noise signal collection includes multiple first anti-phase noise signal, and the phase place of each first anti-phase noise signal and first anti-phase with this
The phase 180 degree of the noise signal of the removable noise source of active noise reduction is treated described in noise signal is corresponding；
First synthesis and suppression unit, be used for the N+1 moment to the described removable noise source collection treating active noise reduction
Each described in treat the removable noise source of active noise reduction, treat active noise reduction according to what described direction adjustment unit determined with this
Removable noise source corresponding towards angle, launch that produced by described first suppression frequency spectrum signal generating unit and described treat actively
The first anti-phase noise signal that the removable noise source of noise reduction is corresponding.
Further, described path acquiring unit of taking action includes GPS subelement, for gathering before the n-th moment
Described specific removable noise source collection front P the moment in n-th moment primary importance information collection and the n-th moment with
Front collection meeting affairs voice recording device is at the second position information collection in front P the moment in n-th moment.
Further, described second noise reduction unit includes:
Fixed noise source screening unit is within Z the moment before the Q moment, complete in gathering presumptive area
The change in location information of portion's noise source, with making an uproar of removing from described whole noise sources that position within this Z moment changes
Sound source, makes the residual noise source in described whole noise source constitute alternative fixed noise source collection, described fixed noise source
Position does not changes over；
Fixed noise source direction-determining unit, for concentrating from described alternative fixed noise source, it is thus achieved that expects solid
Fixed pattern noise source carries out the assigned direction of active noise reduction；
GIS information acquisition unit, for obtaining described assigned direction according to described meeting affairs voice recording device present position
On the geographical location information of fixed noise source, and then obtain described fixed noise source relative to described meeting affairs voice typing
The angle of equipment, and when described fixed noise source is multiple, this angle is and multiple described fixed noise source one a pair
Should；
Second direction adjustment unit, is used for the angle-determining according to the acquisition of described GIS information acquisition unit and adjusts the 3rd
The Noise Acquisition angle of the sound collection sensor in Noise Acquisition unit；
3rd Noise Acquisition unit, including multiple sound collection sensors, for according to described second direction adjustment unit
Adjustment to the acquisition angles of described sound collection sensor, it is thus achieved that the noise signal of described fixed noise source；
Second suppression frequency spectrum signal generating unit, anti-for producing second according to the output signal of described 3rd Noise Acquisition unit
Phase noise signal, this second anti-phase noise signal differs 180 degree with the noise signal of described fixed noise source in phase place；
Second synthesis and suppression unit, for sending described second anti-phase noise signal to described fixed noise source.
Further, described first suppression frequency spectrum signal generating unit includes acoustic-electric converting unit, the noise source trace being one another in series
Wave attenuation unit, the first filter unit and the second filter unit, wherein said noise source trace wave attenuation unit, described first filtering
Unit and described second filter unit are in sequential series.
Further, described acoustic-electric converting unit uses transducer.
Further, the noise signal of described second Noise Acquisition unit collection is included in the second surrounding preset range
Treating the echo that the removable noise source of active noise reduction produces, described noise source trace wave attenuation unit is for specific removable noise
The echo of source collection is decayed, and exists including: particular noise signals reference spectrum acquiring unit, the echo with particular noise signals
In the frequency spectrum acquiring unit of signal, delay acquisition unit, delay unit poor, and arithmetic element；Wherein said specific noise
Signal reference spectrum acquiring unit produces the prearranged signals being attached to fixed reference feature on the basis of described particular noise signals
Frequency spectrum, this prearranged signals frequency spectrum is imported into described delay acquisition unit；Described delay acquisition unit is for according to described predetermined
The periodic feature of signal spectrum, determines the phase contrast between itself and the frequency spectrum of described particular noise signals, and according to this phase place
Difference determine the time difference between described particular noise signals and its echo, described delay unit according to this time difference to described specific
Noise signal carries out time delay, and the signal obtained after time delay is by common at interior signal with the described echo with particular noise signals
It is input to described difference operation unit, thus the echo that the described particular noise signals that decays includes.
Further, described first filter unit is band filter, and its lower limiting frequency and upper cut off frequency are respectively
5Hz and 1800Hz.
Further, described second filter unit includes: 3.7k Ω resistance, 7.9k Ω resistance, 3.2k Ω resistance, 10.94k
Ω resistance, 1.73k Ω resistance, 2.52k Ω resistance, 6.7k Ω resistance, 3.1k Ω resistance, 10.1k Ω resistance, 2k Ω resistance,
4.8k Ω resistance, 7.3k Ω resistance, 10k Ω resistance, 1k Ω resistance, 7k Ω resistance, 2.2k Ω resistance, 4.89k Ω resistance, 2.3k
Ω resistance, 2.32k Ω resistance, 2.5k Ω resistance, 0.51uF electric capacity, 0.21uF electric capacity, 0.38uF electric capacity, 0.82uF electric capacity,
0.35uF electric capacity, 0.23uF electric capacity, 0.12uF electric capacity, 3.1uF electric capacity, 2uF electric capacity, 0.33uF electric capacity, 2.47uF electric capacity,
0.35uF electric capacity, 0.26uF electric capacity, 0.31uF electric capacity, 0.55uF electric capacity, the first operational amplifier, the second operational amplifier,
Three operational amplifiers, four-operational amplifier, the 5th operational amplifier, the 6th operational amplifier, the first Zener diode, second
Zener diode, the 3rd Zener diode, the 4th Zener diode, the 5th Zener diode, the 6th Zener diode, the 7th neat
Receive diode, the first difference operation unit, and the second difference operation unit, wherein, input the input signal end of signal to be filtered
Connect the first end string of the first end of described 3.7k Ω resistance, the second end of described 3.7k Ω resistance and described 7.9k Ω resistance
Connection, the second end of described 7.9k Ω resistance connects the positive input terminal of described first operational amplifier and described 0.51uF electric capacity respectively
The first end, the second end ground connection of described 0.51uF electric capacity, the first end of described 7.9k Ω resistance be also connected with described 0.21uF electricity
The first end held, the second end of described 0.21uF electric capacity connects the outfan of described first operational amplifier, described 3.2k respectively
First end of Ω resistance and the negative input end of described first operational amplifier, the first end of described 3.7k Ω resistance is also respectively connected with
First end of described 2uF electric capacity, the positive pole of the first Zener diode, the second end of described 2uF electric capacity connects described 3.1k respectively
First end of Ω resistance, the positive input terminal of described second operational amplifier, the outfan of described second operational amplifier, described
The outfan of two operational amplifiers connects described via the positive pole of described second Zener diode, the negative pole of the second Zener diode
First end of 2k Ω resistance and the first end of described 3.2k Ω resistance, the second end of described 3.2k Ω resistance connects 10k Ω respectively
First end of resistance, the negative pole of the 3rd Zener diode, first end of described 10.94k Ω, the first of described 0.82uF electric capacity
End, the second end of described 10.94k Ω resistance connects the positive input terminal of the 3rd operational amplifier, described 0.38uF electric capacity respectively
First end, the second end ground connection of described 0.38uF electric capacity, the second end of described 0.82uF electric capacity connects described 3rd computing respectively
The outfan of amplifier, the first end of described 1.73k Ω resistance, the negative input end of described 3rd operational amplifier and described
The positive pole of three Zener diodes, the second end of described 1.73k Ω resistance connect respectively described 2.52k Ω resistance the first end and
First end of described 0.35uF electric capacity, the second end of described 2.52k Ω resistance connects the positive input of four-operational amplifier respectively
End and the first end of 0.23uF electric capacity, the second end ground connection of described 0.23uF electric capacity, the second end of described 0.35uF electric capacity is respectively
Connect the outfan of described four-operational amplifier, the negative input end of described second difference operation unit and described 4th computing to put
The negative input end of big device, the negative pole of described first Zener diode connects the positive input terminal of the first difference operation unit, and described first
The positive pole of Zener diode is also respectively connected with the first end of described 1k Ω resistance, the negative pole of described 4th Zener diode, described
First end of 7.3k Ω resistance, the first end of described 0.33uF electric capacity, the second end of described 7.3k Ω resistance connects described 10k Ω
First end of resistance, the second end of described 10k Ω resistance connects the first end of described 0.35uF electric capacity, described 5th Zener respectively
The negative pole of diode, the first end of described 2.3k Ω resistance, the second end of described 2.3k Ω resistance connects described 0.55uF respectively
First end of electric capacity, the first end of described 0.31uF electric capacity and the first end of 2.32k Ω resistance, described 2.32k Ω resistance
Second end ground connection, the second end of described 0.31uF electric capacity connects the negative input end of described 5th operational amplifier, described respectively
First end of 2.5k Ω resistance, the second end of described 2.5k Ω resistance connect respectively the second end of described 0.55uF electric capacity, the 5th
The outfan of operational amplifier and the positive input terminal of described second difference operation unit, the negative input of described first difference operation unit
End connects the first end of described 0.12uF electric capacity, the first end of described 4.8k Ω resistance and described 6th operational amplifier respectively
Outfan, the second end of described 0.12uF electric capacity connect respectively the first end of described 3.1uF electric capacity, the second of 6.7k Ω resistance
End, the first end of described 10.1k Ω resistance, the second end of described 3.1uF electric capacity connects the second of described 4.8k Ω resistance respectively
End and the negative input end of described 6th operational amplifier, the second end ground connection of described 10.1k Ω resistance, described 6.7k Ω resistance
First end connects the outfan of described second difference operation unit, and the positive input terminal of described 6th operational amplifier connects the described 5th
The positive input terminal of operational amplifier, the outfan of described first difference operation unit connect respectively described 1k Ω resistance the second end,
The positive pole of described 4th Zener diode, the positive pole of described 6th Zener diode, the first end of described 2.47uF electric capacity, described
First end of 7k Ω resistance, the first end of described 2.2k Ω resistance, the negative pole of described 6th Zener diode connects described respectively
The outfan of the 6th operational amplifier, the second end of described 0.33uF electric capacity, the second end of described 2.2k Ω resistance connects respectively
First end of described 0.26uF electric capacity, the positive pole of described 5th Zener diode and the positive pole of described 7th Zener diode and
First end of described 4.89k Ω resistance, the second end of described 4.89k Ω resistance connects the positive input of described 5th operational amplifier
End, the second end of described 2.47uF electric capacity, the second end of described 7k Ω resistance, the second end of described 0.35uF electric capacity, described
Second end of 0.26uF electric capacity and the minus earth of described 7th Zener diode.
The invention has the beneficial effects as follows:
(1) present invention can carry out active noise reduction to the noise source of autonomous, overcomes in prior art and is typically only capable of
Enough technical schemes that fixed noise source carries out noise reduction are unsuitable for the defect of actual application, so that user can be in record
On the basis of the voice de-noising technology that the equipment such as sound pen have, other directions undesirably recorded (are considered as fixed making an uproar
Sound source and the direction at mobile noise source place) noise carry out active suppression, improve recording tonequality, reduce typing on-the-spot its
The probability of his noise；
(2) noise source during other can be moved in movement by the meeting affairs voice recording device of the present invention carries out actively dropping
Make an uproar so that in certain area, (preset range, the second surrounding preset range etc. around the most mentioned above first) is really real
The suppression of existing noise, so that when the meeting affairs voice recording device of the present invention is arranged to suitable number, enter this region
The interior personnel not configuring active noise reduction or passive meeting affairs voice recording device also will not be invaded and harassed by noise；
(3) the making an uproar of the fixed noise source that position can also not changed over by the meeting affairs voice recording device of the present invention
Sound, carries out active noise reduction in meeting affairs voice recording device moving process, thus provides more quietly environment for user；
(4) second filter unit of the present invention combines the process needed for signal spectrum, it is possible to reach following index: set
Put band connection frequency fp1=800Hz, fp2=4300Hz, stop-band frequency fs1=750Hz, Fs2=4400Hz, minimum attenuation in stop band
As=70dB, passband maximum attenuation Ap=3dB, be much better than existing simple FIR and sef-adapting filter.
(7) well-designed filter unit is coordinated the active noise reduction skill of moveable and fixed noise source by the present invention
Art, compares the existing most of technical schemes carrying out active noise reduction only for human ear so that have the meeting affairs voice of the present invention
The device of recording device or system have more high sensitivity and noise suppressed degree.
Accompanying drawing explanation
Fig. 1 shows the composition frame chart of the meeting affairs voice recording device according to the present invention.
Fig. 2 shows the circuit diagram of the second filter unit.
Detailed description of the invention
As it is shown in figure 1, according to a preferred embodiment of the invention, the invention provides a kind of meeting affairs voice recording device, bag
Include: meeting-place noise detection unit, voice recording unit, active noise eliminate unit, and described meeting-place noise detection unit is used for
The decibels of detection meeting-place noise, described active noise eliminates unit and determines whether including mobile noise according to this decibels
Source and fixed noise source carry out active noise reduction at interior noise, and described voice recording unit eliminates according to described active noise
The notification message of unit carries out voice recording.
Described meeting-place noise detection unit includes at least one sonic transducer, for gathering the sound of meeting-place environment (herein
Using the overall decibels of meeting-place environment as the reference index of meeting-place noise).Described voice recording unit includes being one another in series
Such as lower component: at least one acoustic sensor array, voice signal amplify and filter unit, voice signal AD conversion unit and
Voice signal memory element.
Described active noise eliminates unit and includes: interaction interface unit, the first noise reduction unit and the second noise reduction unit,
Wherein said interaction interface unit is connected with the first noise reduction unit and the second noise reduction unit respectively, and described interaction interface unit is used
Control when the decibels detected according to described meeting-place noise detection unit exceedes predetermined threshold value described first noise reduction unit and/
Or described second noise reduction unit carries out active noise reduction, described first noise reduction unit is for carrying out actively the noise of mobile noise source
Suppression, the noise of the noise reduction unit of the described fixed noise source noise source for absolutely not becoming position carries out active suppression,
Fixed noise source described in the absolute invariant representation in described position is fixed in locus, somewhere and this position and does not changes over.
According to a preferred embodiment of the invention, described interaction interface unit includes communicator unit, touch subunit, instruction
Conversion unit of protocol and driver element, described communicator unit is apolegamy.Communicator unit is used for receiving external transmission to described
Meeting affairs voice recording device carries out noise reduction whether control instruction, and (the meeting affairs voice typing being i.e. equivalent to whether open the present invention sets
Standby instruction) and fixed noise source and/or mobile noise source are carried out the instruction of the mode of operations such as active noise reduction, its communication
Circuit can select communication module based on one of GPRS, 3G, 4G.Described touch subunit is used for receiving user input when participating in the cintest
To above-mentioned each instruction of the meeting affairs voice recording device of the present invention, with facilitate user on described meeting affairs voice recording device not
Remain able to control when configuration and the outside communicator unit carrying out telecommunication described meeting affairs voice recording device unlatching and
Mode of operation.Described command protocols converting unit for according to communication protocol set in advance (such as, including compression algorithm, add
The various agreements related in the communication process of close agreement, GPRS/3G/4G etc.) data received are carried out form conversion, with
For described driver element Direct Recognition.This communication Protocol Conversion unit is preferably integrated with the work of these meeting affairs voice recording device
The parsing of the data that operation mode is relevant, to obtain indicating whether open this meeting affairs voice recording device and open the first noise reduction list
Unit and/or open the second noise reduction unit, can be by the control word of described driver element Direct Recognition.Described driver element is used for
It is connected respectively with described first noise reduction unit and described second noise reduction unit, defeated with according to described command protocols converting unit
Go out, described first noise reduction unit and/or described second noise reduction unit are opened.
Drive circuit (the driving of the agreements such as such as RS485, RS232, USB, I2C that above-mentioned agreement and driver element relate to
Circuit) be those skilled in the art according to actual design Demand Design, its role is the base of these agreements and unit
This function does not repeats them here.
Below, the concrete structure of the first noise reduction unit and the second noise reduction unit is described in detail.
Described first noise reduction unit includes:
First Noise Acquisition and position associative cell, including the first Noise Acquisition subelement, the first echo obtain subelement,
First electronic chart obtains subelement, the first mark object obtains subelement and associates subelement with primary importance, and wherein said the
One Noise Acquisition subelement is for gathering on described equipment other directions outside the direction of expectation recording in the m-th moment
The noise signal of the whole noise sources in the first surrounding preset range, described first echo obtains subelement for described first
After Noise Acquisition subelement completes above-mentioned collection, launch ultrasonic signal to described first surrounding preset range and to gather this ultrasonic
The echo of ripple signal, described first electronic chart obtains subelement for obtaining predetermined model around described the first of m-th moment
Enclose interior, include the electronic chart can taken action including routing information；Described first mark object obtains subelement for based on institute
State electronic chart and obtain the mark on path, that be identified on described electronic chart of respectively can taking action of routing information instruction of can taking action
Knowing, described primary importance association subelement is for the mark determined according to described first mark object acquisition subelement, based on institute
State the first echo and obtain each noise source that the echo-signal of each noise source that subelement determines determines relative to described meeting affairs voice
The direction of recording device and distance, set up the pass of mapping one to one between each mark on each noise source and electronic chart
System, described M is positive integer；
Removable noise source screening unit, within Z the moment before the Q moment, gathers described whole noise
The change in location information in source, to remove the noise source that position does not changes within this Z moment from described whole noise sources,
The residual noise source in described whole noise source is made to constitute alternative mobile noise source collection；
Specific removable noise source collection determines unit, for being set by band segment interested in described whole noise signals
For particular noise signals, concentrate from described alternative mobile noise source and determine that sending at least one of this particular noise signals moves and make an uproar
Sound source, the most specific removable noise source collection；
Can take action path acquiring unit, predetermined for obtaining around the second of described meeting affairs voice recording device position
In the range of taken action routing information, and before the n-th moment, gather described specific removable noise source collection when n-th
Carve front P the moment primary importance information collection and before the n-th moment collection meeting affairs voice recording device when n-th
The second position information collection in front P the moment carved, described routing information of taking action includes road information, wherein N-M > P, and N and P
Being positive integer, described second surrounding preset range belongs to a part for described first surrounding preset range；
Noise source path determining unit, for the taken action routing information obtained according to described path acquiring unit of taking action
And primary importance information collection, each determining by the way of matching that this specific removable noise source collection includes is specific removable
Noise source the N+1 moment relative to the first estimating position information collection in described path of taking action, described first estimating position
Information collection includes each specific removable noise source estimating position information N+1 moment；
Meeting affairs voice typing device path determines unit, feasible for obtain according to described path acquiring unit of taking action
Dynamic routing information and second position information collection, determine that by the way of matching described meeting affairs voice recording device is at N+1
Moment is relative to the second estimating position information in described path of taking action；
Removable noise reduction starts judging unit, and first for obtaining according to described noise source path determining unit estimates position
Confidence breath collection, calculates each specific removable noise source of including at removable noise source collection specific described in the N+1 moment
At least one difference between second estimating position information of position and described meeting affairs voice recording device, determines this at least one
Comparative result between difference and predeterminable range difference, will be less than described in predeterminable range difference with threshold distance according to this comparative result
The specific removable noise source that specific removable noise source is concentrated is defined as treating the removable noise source of active noise reduction；
First direction adjustment unit, treats the removable of active noise reduction described in concentrating based on the first estimating position information
Noise source at the position in N+1 moment and described meeting affairs voice recording device at second estimating position in N+1 moment
Information, determines that described in the collection of described second Noise Acquisition unit, sound passes when the noise of the removable noise source of active noise reduction
Sensor towards angle；
Second Noise Acquisition unit, including multiple sound transducers, described second Noise Acquisition unit is for according to described
The removable noise controlling to treat described in described sound transducer collection active noise reduction towards angle that first direction adjustment unit determines
The noise signal in source, treat described at least one the noise signal of the removable noise source of active noise reduction constitute treat active noise reduction can
Mobile noises from noise sources collection；
First suppression frequency spectrum signal generating unit, for according to treat that the removable noises from noise sources collection of active noise reduction relates to each
The noise signal of the described removable noise source treating active noise reduction, produces the first anti-phase noise signal collection accordingly, and this is first anti-
Phase noise signal collection includes multiple first anti-phase noise signal, and the phase place of each first anti-phase noise signal and first anti-phase with this
The phase 180 degree of the noise signal of the removable noise source of active noise reduction is treated described in noise signal is corresponding；
First synthesis and suppression unit, be used for the N+1 moment to the described removable noise source collection treating active noise reduction
Each described in treat the removable noise source of active noise reduction, treat active noise reduction according to what described direction adjustment unit determined with this
Removable noise source corresponding towards angle, launch that produced by described first suppression frequency spectrum signal generating unit and described treat actively
The first anti-phase noise signal that the removable noise source of noise reduction is corresponding.
Described path acquiring unit of taking action includes GPS subelement, for gathered before the n-th moment described specific can
Mobile noise source collection is at the primary importance information collection in front P the moment in n-th moment and gathers meeting affairs before the n-th moment
Voice recording device is at the second position information collection in front P the moment in n-th moment.
Described second noise reduction unit includes:
Fixed noise source screening unit is within Z the moment before the Q moment, complete in gathering presumptive area
The change in location information of portion's noise source, with making an uproar of removing from described whole noise sources that position within this Z moment changes
Sound source, makes the residual noise source in described whole noise source constitute alternative fixed noise source collection, described fixed noise source
Position does not changes over；
Fixed noise source direction-determining unit, for concentrating from described alternative fixed noise source, it is thus achieved that expects solid
Fixed pattern noise source carries out the assigned direction of active noise reduction；
GIS information acquisition unit, for obtaining described assigned direction according to described meeting affairs voice recording device present position
On the geographical location information of fixed noise source, and then obtain described fixed noise source relative to described meeting affairs voice typing
The angle of equipment, and when described fixed noise source is multiple, this angle is and multiple described fixed noise source one a pair
Should；
Second direction adjustment unit, is used for the angle-determining according to the acquisition of described GIS information acquisition unit and adjusts the 3rd
The Noise Acquisition angle of the sound collection sensor in Noise Acquisition unit；
3rd Noise Acquisition unit, including multiple sound collection sensors, for according to described second direction adjustment unit
Adjustment to the acquisition angles of described sound collection sensor, it is thus achieved that the noise signal of described fixed noise source；
Second suppression frequency spectrum signal generating unit, anti-for producing second according to the output signal of described 3rd Noise Acquisition unit
Phase noise signal, this second anti-phase noise signal differs 180 degree with the noise signal of described fixed noise source in phase place；
Second synthesis and suppression unit, for sending described second anti-phase noise signal to described fixed noise source.
Described first suppression frequency spectrum signal generating unit includes acoustic-electric converting unit, the noise source trace wave attenuation list being one another in series
Unit, the first filter unit and the second filter unit, wherein said noise source trace wave attenuation unit, described first filter unit and institute
State the second filter unit in sequential series.
Described acoustic-electric converting unit uses transducer.
What the noise signal of described second Noise Acquisition unit collection was included in the second surrounding preset range treats actively to drop
The echo that the removable noise source made an uproar produces, described noise source trace wave attenuation unit is for returning specific removable noise source collection
Sound is decayed, include: particular noise signals reference spectrum acquiring unit, the signal having including the echo of particular noise signals
Frequency spectrum acquiring unit, delay acquisition unit, delay unit poor, and arithmetic element；Wherein said particular noise signals reference
Frequency spectrum acquiring unit produces the prearranged signals frequency spectrum being attached to fixed reference feature on the basis of described particular noise signals, and this is pre-
Determine signal spectrum and be imported into described delay acquisition unit；Described delay acquisition unit is for according to described prearranged signals frequency spectrum
Periodic feature, determines the phase contrast between itself and the frequency spectrum of described particular noise signals, and determines according to this phase contrast described
Time difference between particular noise signals and its echo, described particular noise signals is entered by described delay unit according to this time difference
Line delay, the signal obtained after time delay is jointly input to described with the described echo with particular noise signals at interior signal
Difference operation unit, thus the echo that the described particular noise signals that decays includes.
Preferably, described first filter unit is band filter, and its lower limiting frequency and upper cut off frequency are respectively 5Hz
And 1800Hz.
Preferably, described second filter unit includes: 3.7k Ω resistance, 7.9k Ω resistance, 3.2k Ω resistance, 10.94k Ω
Resistance, 1.73k Ω resistance, 2.52k Ω resistance, 6.7k Ω resistance, 3.1k Ω resistance, 10.1k Ω resistance, 2k Ω resistance, 4.8k
Ω resistance, 7.3k Ω resistance, 10k Ω resistance, 1k Ω resistance, 7k Ω resistance, 2.2k Ω resistance, 4.89k Ω resistance, 2.3k Ω electricity
Resistance, 2.32k Ω resistance, 2.5k Ω resistance, 0.51uF electric capacity, 0.21uF electric capacity, 0.38uF electric capacity, 0.82uF electric capacity, 0.35uF
Electric capacity, 0.23uF electric capacity, 0.12uF electric capacity, 3.1uF electric capacity, 2uF electric capacity, 0.33uF electric capacity, 2.47uF electric capacity, 0.35uF electricity
Appearance, 0.26uF electric capacity, 0.31uF electric capacity, 0.55uF electric capacity, the first operational amplifier, the second operational amplifier, the 3rd computing are put
Big device, four-operational amplifier, the 5th operational amplifier, the 6th operational amplifier, the first Zener diode, the second Zener two pole
Pipe, the 3rd Zener diode, the 4th Zener diode, the 5th Zener diode, the 6th Zener diode, the 7th Zener two pole
Pipe, the first difference operation unit, and the second difference operation unit, wherein, the input signal end inputting signal to be filtered connects institute
Stating the first end of 3.7k Ω resistance, the second end of described 3.7k Ω resistance is connected with the first end of described 7.9k Ω resistance, described
Second end of 7.9k Ω resistance connects the positive input terminal and the first of described 0.51uF electric capacity of described first operational amplifier respectively
End, the second end ground connection of described 0.51uF electric capacity, the first end of described 7.9k Ω resistance is also connected with the of described 0.21uF electric capacity
One end, the second end of described 0.21uF electric capacity connects the outfan of described first operational amplifier, described 3.2k Ω resistance respectively
The first end and the negative input end of described first operational amplifier, the first end of described 3.7k Ω resistance is also respectively connected with described
First end of 2uF electric capacity, the positive pole of the first Zener diode, the second end of described 2uF electric capacity connects described 3.1k Ω electricity respectively
First end of resistance, the positive input terminal of described second operational amplifier, the outfan of described second operational amplifier, described second fortune
Calculate the outfan positive pole via described second Zener diode of amplifier, the negative pole of the second Zener diode connects described 2k Ω
First end of resistance and the first end of described 3.2k Ω resistance, the second end of described 3.2k Ω resistance connects 10k Ω resistance respectively
The first end, the negative pole of the 3rd Zener diode, first end of described 10.94k Ω, the first end of described 0.82uF electric capacity, institute
The second end stating 10.94k Ω resistance connect respectively the positive input terminal of the 3rd operational amplifier, the first of described 0.38uF electric capacity
End, the second end ground connection of described 0.38uF electric capacity, the second end of described 0.82uF electric capacity connects described 3rd operation amplifier respectively
The outfan of device, the first end of described 1.73k Ω resistance, the negative input end of described 3rd operational amplifier and described 3rd neat
Receiving the positive pole of diode, the second end of described 1.73k Ω resistance connects the first end of described 2.52k Ω resistance and described respectively
First end of 0.35uF electric capacity, the second end of described 2.52k Ω resistance connect respectively four-operational amplifier positive input terminal and
First end of 0.23uF electric capacity, the second end ground connection of described 0.23uF electric capacity, the second end of described 0.35uF electric capacity connects respectively
The outfan of described four-operational amplifier, the negative input end of described second difference operation unit and described four-operational amplifier
Negative input end, the negative pole of described first Zener diode connects the positive input terminal of the first difference operation unit, described first Zener
The positive pole of diode is also respectively connected with the first end of described 1k Ω resistance, the negative pole of described 4th Zener diode, described 7.3k
First end of Ω resistance, the first end of described 0.33uF electric capacity, the second end of described 7.3k Ω resistance connects described 10k Ω resistance
The first end, the second end of described 10k Ω resistance connects the first end of described 0.35uF electric capacity, described 5th Zener two pole respectively
The negative pole of pipe, the first end of described 2.3k Ω resistance, the second end of described 2.3k Ω resistance connects described 0.55uF electric capacity respectively
The first end, the first end of described 0.31uF electric capacity and the first end of 2.32k Ω resistance, the second of described 2.32k Ω resistance
End ground connection, the second end of described 0.31uF electric capacity connects the negative input end of described 5th operational amplifier, described 2.5k Ω respectively
First end of resistance, the second end of described 2.5k Ω resistance connects the second end of described 0.55uF electric capacity respectively, the 5th computing is put
The outfan of big device and the positive input terminal of described second difference operation unit, the negative input end of described first difference operation unit is respectively
Connect the first end of described 0.12uF electric capacity, the first end of described 4.8k Ω resistance and the output of described 6th operational amplifier
End, the second end of described 0.12uF electric capacity connects the first end of described 3.1uF electric capacity, the second end of 6.7k Ω resistance, institute respectively
Stating the first end of 10.1k Ω resistance, the second end of described 3.1uF electric capacity connects the second end and the institute of described 4.8k Ω resistance respectively
State the negative input end of the 6th operational amplifier, the second end ground connection of described 10.1k Ω resistance, the first end of described 6.7k Ω resistance
Connecting the outfan of described second difference operation unit, the positive input terminal of described 6th operational amplifier connects described 5th computing and puts
The positive input terminal of big device, the outfan of described first difference operation unit connect respectively the second end of described 1k Ω resistance, described the
The positive pole of four Zener diodes, the positive pole of described 6th Zener diode, the first end of described 2.47uF electric capacity, described 7k Ω electricity
First end of resistance, the first end of described 2.2k Ω resistance, the negative pole of described 6th Zener diode connects described 6th fortune respectively
Calculating the outfan of amplifier, the second end of described 0.33uF electric capacity, the second end of described 2.2k Ω resistance connects described respectively
First end of 0.26uF electric capacity, the positive pole of described 5th Zener diode and the positive pole of described 7th Zener diode and described
First end of 4.89k Ω resistance, the second end of described 4.89k Ω resistance connects the positive input terminal of described 5th operational amplifier,
Second end of described 2.47uF electric capacity, the second end of described 7k Ω resistance, the second end of described 0.35uF electric capacity, described 0.26uF
Second end of electric capacity and the minus earth of described 7th Zener diode.
According to a preferred embodiment of the invention, each difference operation unit described can select subtractor.
The narration made for presently preferred embodiments of the present invention above is the purpose for illustrating, and is not intended to limit present invention essence
Really for disclosed form, learn and make an amendment or change to be possible based on above teaching or from embodiments of the invention
, embodiment is for explaining orally the principle of the present invention and allowing those skilled in the art utilize the present invention to exist with various embodiments
Actual application is upper and selects and narration, and the technological thought attempt of the present invention is determined by claim and equalization thereof.
Claims (10)
1. a meeting affairs voice recording device, it is characterised in that including: meeting-place noise detection unit, voice recording unit, actively
Formula noise eliminates unit, and described meeting-place noise detection unit is for detecting the decibels of meeting-place noise, and described active noise disappears
Except unit determines whether to carry out the noise including mobile noise source and fixed noise source actively dropping according to this decibels
Making an uproar, the notification message that described voice recording unit eliminates unit according to described active noise carries out voice recording.
Meeting affairs voice recording device the most according to claim 1, it is characterised in that described active noise eliminates unit bag
Including: interaction interface unit, the first noise reduction unit and the second noise reduction unit, wherein said interaction interface unit drops with first respectively
Unit and the second noise reduction unit of making an uproar connects, and described interaction interface unit is for detecting according to described meeting-place noise detection unit
Decibels control described first noise reduction unit when exceeding predetermined threshold value and/or described second noise reduction unit carries out active noise reduction,
Described first noise reduction unit is for carrying out active suppression, the noise reduction unit of described fixed noise source to the noise of mobile noise source
The noise of the noise source for absolutely not becoming position carries out active suppression, fixed described in the absolute invariant representation in described position makes an uproar
Sound source is fixed in locus, somewhere and this position and does not changes over.
Meeting affairs voice recording device the most according to claim 2, it is characterised in that described first noise reduction unit includes:
First Noise Acquisition and position associative cell, including the first Noise Acquisition subelement, the first echo obtain subelement, first
Electronic chart obtains subelement, the first mark object obtains subelement and associates subelement with primary importance, and wherein said first makes an uproar
Sound gathers subelement for gathering first on described equipment other directions outside the direction of expectation recording in the m-th moment
The noise signal of the whole noise sources in preset range around, described first echo obtains subelement at described first noise
After collection subelement completes above-mentioned collection, launch ultrasonic signal to described first surrounding preset range and gather this ultrasound wave letter
Number echo, described first electronic chart obtains subelement in obtaining the described first surrounding preset range in m-th moment
, include the electronic chart can taken action including routing information；Described first mark object obtains subelement for based on described electricity
Sub-map obtains the mark on path, that be identified on described electronic chart of respectively can taking action of routing information instruction of can taking action,
Described primary importance association subelement is for obtaining, according to described first mark object, mark that subelement determines, based on described the
Each noise source that the echo-signal of each noise source that one echo acquisition subelement determines determines is relative to described meeting affairs voice typing
The direction of equipment and distance, set up the mapping relations one to one between each mark on each noise source and electronic chart,
Described M is positive integer；
Removable noise source screening unit, within Z the moment before the Q moment, gathers described whole noise source
Change in location information, to remove the noise source that position does not changes within this Z moment from described whole noise sources, makes institute
The residual noise source in whole noise source of stating constitutes alternative mobile noise source collection；
Specific removable noise source collection determines unit, for band segment interested in described whole noise signals is set to spy
Determine noise signal, concentrate from described alternative mobile noise source and determine that at least one sending this particular noise signals moves noise
Source, the most specific removable noise source collection；
Can take action path acquiring unit, for obtaining the second surrounding preset range of described meeting affairs voice recording device position
Interior taken action routing information, and before the n-th moment, gather described specific removable noise source collection in the n-th moment
The primary importance information collection in front P moment and gathered meeting affairs voice recording device before the n-th moment in the n-th moment
The second position information collection in front P moment, described routing information of taking action includes road information, wherein N-M > P, and N and P is
Positive integer, described second surrounding preset range belongs to a part for described first surrounding preset range；
Noise source path determining unit, for the taken action routing information obtained according to the described path acquiring unit of taking action and
Primary importance information collection, determines each specific removable noise that this specific removable noise source collection includes by the way of matching
Source the N+1 moment relative to the first estimating position information collection in described path of taking action, described first estimating position information
Collection includes each specific removable noise source estimating position information N+1 moment；
Meeting affairs voice typing device path determines unit, for the taken action road obtained according to described path acquiring unit of taking action
Footpath information and second position information collection, determine that by the way of matching described meeting affairs voice recording device is the N+1 moment
The second estimating position information relative to described path of taking action；
Removable noise reduction starts judging unit, for the first estimating position letter obtained according to described noise source path determining unit
Breath collection, calculates the position of each the specific removable noise source included at removable noise source collection specific described in the N+1 moment
And at least one difference between the second estimating position information of described meeting affairs voice recording device, determines this at least one difference
And the comparative result between predeterminable range difference, will be less than the described specific of predeterminable range difference with threshold distance according to this comparative result
The specific removable noise source that removable noise source is concentrated is defined as treating the removable noise source of active noise reduction；
First direction adjustment unit, for based on the removable noise treating active noise reduction described in the first estimating position information concentration
Source at the position in N+1 moment and described meeting affairs voice recording device in the second estimating position information in N+1 moment,
Determine described in described second Noise Acquisition unit collection sound transducer when the noise of the removable noise source of active noise reduction
Towards angle；
Second Noise Acquisition unit, including multiple sound transducers, described second Noise Acquisition unit is for according to described first
The removable noise source controlling to treat described in described sound transducer collection active noise reduction towards angle that direction adjustment unit determines
Noise signal, treats described at least one that the noise signal of the removable noise source of active noise reduction is constituted and treats the removable of active noise reduction
Noises from noise sources collection；
First suppression frequency spectrum signal generating unit, for according to treat that the removable noises from noise sources collection of active noise reduction relates to each described in
Treating the noise signal of the removable noise source of active noise reduction, produce the first anti-phase noise signal collection accordingly, this first anti-phase is made an uproar
Acoustical signal collection includes multiple first anti-phase noise signal, and the phase place of each first anti-phase noise signal and with this first anti-phase noise
The phase 180 degree of the noise signal of the removable noise source of active noise reduction is treated described in signal is corresponding；
First synthesis and suppression unit, for every to the described removable noise source collection treating active noise reduction of the N+1 moment
Treat the removable noise source of active noise reduction described in one, determine according to described direction adjustment unit with this treat active noise reduction can
Mobile noise source corresponding towards angle, launch that produced by described first suppression frequency spectrum signal generating unit and described treat active noise reduction
The first anti-phase noise signal corresponding to removable noise source.
Meeting affairs voice recording device the most according to claim 3, it is characterised in that described path acquiring unit bag of taking action
Include GPS subelement, for gathering described specific removable noise source collection before the n-th moment when first P of n-th moment
Carve primary importance information collection and before the n-th moment gather meeting affairs voice recording device when first P of n-th moment
The second position information collection carved.
5. according to the meeting affairs voice recording device one of claim 1-4 Suo Shu, it is characterised in that described second noise reduction unit bag
Include:
Fixed noise source screening unit, within Z the moment before the Q moment, all makes an uproar in gathering presumptive area
The change in location information of sound source, to remove the noise source that position changes within this Z moment from described whole noise sources,
Making the residual noise source in described whole noise source constitute alternative fixed noise source collection, the position of described fixed noise source is not
Change over；
Fixed noise source direction-determining unit, for concentrating from described alternative fixed noise source, it is thus achieved that expectation is to fixed
Noise source carries out the assigned direction of active noise reduction；
GIS information acquisition unit, for obtaining on described assigned direction according to described meeting affairs voice recording device present position
The geographical location information of fixed noise source, and then obtain described fixed noise source relative to described meeting affairs voice recording device
Angle, and when described fixed noise source is multiple, this angle is and multiple described fixed noise source one_to_one corresponding；
Second direction adjustment unit, is used for the angle-determining according to the acquisition of described GIS information acquisition unit and adjusts the 3rd noise
The Noise Acquisition angle of the sound collection sensor in collecting unit；
3rd Noise Acquisition unit, including multiple sound collection sensors, is used for according to described second direction adjustment unit institute
State the adjustment of the acquisition angles of sound collection sensor, it is thus achieved that the noise signal of described fixed noise source；
Second suppression frequency spectrum signal generating unit, anti-phase makes an uproar for producing second according to the output signal of described 3rd Noise Acquisition unit
Acoustical signal, this second anti-phase noise signal differs 180 degree with the noise signal of described fixed noise source in phase place；
Second synthesis and suppression unit, for sending described second anti-phase noise signal to described fixed noise source.
6. according to the meeting affairs voice recording device described in claim 3 or 4, it is characterised in that described first suppression frequency spectrum generates
Unit includes acoustic-electric converting unit, noise source trace wave attenuation unit, the first filter unit and the second filter unit being one another in series,
Wherein said noise source trace wave attenuation unit, described first filter unit and described second filter unit are in sequential series.
Meeting affairs voice recording device the most according to claim 6, it is characterised in that described acoustic-electric converting unit uses transducing
Device.
Meeting affairs voice recording device the most according to claim 6, it is characterised in that described second Noise Acquisition unit gathers
Noise signal be included in the second surrounding preset range treat active noise reduction removable noise source produce echo, described in make an uproar
Sound source trace wave attenuation unit is used for decaying the echo of specific removable noise source collection, including: particular noise signals reference
Frequency spectrum acquiring unit, there is the echo frequency spectrum acquiring unit at interior signal of particular noise signals, delay acquisition unit, time delay
Unit is poor, and arithmetic element；Wherein said particular noise signals reference spectrum acquiring unit produces to be believed in described specific noise
Being attached to the prearranged signals frequency spectrum of fixed reference feature on the basis of number, this prearranged signals frequency spectrum is imported into described delay acquisition list
Unit；Described delay acquisition unit, for the periodic feature according to described prearranged signals frequency spectrum, determines itself and described specific noise
Phase contrast between the frequency spectrum of signal, and determine the time between described particular noise signals and its echo according to this phase contrast
Difference, described delay unit carries out time delay according to this time difference to described particular noise signals, the signal obtained after time delay by with institute
State the echo with particular noise signals and be jointly input to described difference operation unit at interior signal, thus described specific make an uproar of decaying
The echo that acoustical signal includes.
Meeting affairs voice recording device the most according to claim 8, it is characterised in that described first filter unit is the logical filter of band
Ripple device, its lower limiting frequency and upper cut off frequency are respectively 5Hz and 1800Hz.
Meeting affairs voice recording device the most according to claim 9, it is characterised in that described second filter unit includes:
3.7k Ω resistance, 7.9k Ω resistance, 3.2k Ω resistance, 10.94k Ω resistance, 1.73k Ω resistance, 2.52k Ω resistance, 6.7k Ω
Resistance, 3.1k Ω resistance, 10.1k Ω resistance, 2k Ω resistance, 4.8k Ω resistance, 7.3k Ω resistance, 10k Ω resistance, 1k Ω electricity
Resistance, 7k Ω resistance, 2.2k Ω resistance, 4.89k Ω resistance, 2.3k Ω resistance, 2.32k Ω resistance, 2.5k Ω resistance, 0.51uF electricity
Appearance, 0.21uF electric capacity, 0.38uF electric capacity, 0.82uF electric capacity, 0.35uF electric capacity, 0.23uF electric capacity, 0.12uF electric capacity, 3.1uF electricity
Appearance, 2uF electric capacity, 0.33uF electric capacity, 2.47uF electric capacity, 0.35uF electric capacity, 0.26uF electric capacity, 0.31uF electric capacity, 0.55uF electric capacity,
First operational amplifier, the second operational amplifier, the 3rd operational amplifier, four-operational amplifier, the 5th operational amplifier,
Six operational amplifiers, the first Zener diode, the second Zener diode, the 3rd Zener diode, the 4th Zener diode, the 5th
Zener diode, the 6th Zener diode, the 7th Zener diode, the first difference operation unit, and the second difference operation unit, its
In, the input signal end inputting signal to be filtered connects the first end of described 3.7k Ω resistance, the of described 3.7k Ω resistance
Two ends are connected with the first end of described 7.9k Ω resistance, and the second end of described 7.9k Ω resistance connects described first computing respectively and puts
The positive input terminal of big device and the first end of described 0.51uF electric capacity, the second end ground connection of described 0.51uF electric capacity, described 7.9k Ω
First end of resistance is also connected with the first end of described 0.21uF electric capacity, and the second end of described 0.21uF electric capacity connects described respectively
The outfan of one operational amplifier, the first end of described 3.2k Ω resistance and the negative input end of described first operational amplifier, institute
The first end stating 3.7k Ω resistance is also respectively connected with the first end of described 2uF electric capacity, the positive pole of the first Zener diode, described
Second end of 2uF electric capacity connects the first end of described 3.1k Ω resistance, the positive input terminal of described second operational amplifier, institute respectively
Stating the outfan of the second operational amplifier, the outfan of described second operational amplifier is via described second Zener diode just
Pole, the negative pole of the second Zener diode connect the first end and first end of described 3.2k Ω resistance of described 2k Ω resistance, described
Second end of 3.2k Ω resistance connects the first end of 10k Ω resistance, the negative pole of the 3rd Zener diode, described 10.94k Ω respectively
The first end, the first end of described 0.82uF electric capacity, the second end of described 10.94k Ω resistance connects the 3rd operation amplifier respectively
The positive input terminal of device, the first end of described 0.38uF electric capacity, the second end ground connection of described 0.38uF electric capacity, described 0.82uF electric capacity
The second end connect the outfan of described 3rd operational amplifier, the first end of described 1.73k Ω resistance, described 3rd fortune respectively
Calculating negative input end and the positive pole of described 3rd Zener diode of amplifier, the second end of described 1.73k Ω resistance connects respectively
Connecing the first end and first end of described 0.35uF electric capacity of described 2.52k Ω resistance, the second end of described 2.52k Ω resistance divides
Do not connect the positive input terminal of four-operational amplifier and the first end of 0.23uF electric capacity, the second termination of described 0.23uF electric capacity
Ground, the second end of described 0.35uF electric capacity connects the outfan of described four-operational amplifier, described second difference operation list respectively
The negative input end of unit and the negative input end of described four-operational amplifier, the negative pole of described first Zener diode connects first
The positive input terminal of difference operation unit, the positive pole of described first Zener diode be also respectively connected with described 1k Ω resistance the first end,
The negative pole of described 4th Zener diode, the first end of described 7.3k Ω resistance, the first end of described 0.33uF electric capacity, described
Second end of 7.3k Ω resistance connects the first end of described 10k Ω resistance, and the second end of described 10k Ω resistance connects described respectively
First end of 0.35uF electric capacity, the negative pole of described 5th Zener diode, the first end of described 2.3k Ω resistance, described 2.3k Ω
Second end of resistance connects the first end of described 0.55uF electric capacity, the first end of described 0.31uF electric capacity and 2.32k Ω respectively
First end of resistance, the second end ground connection of described 2.32k Ω resistance, the second end of described 0.31uF electric capacity connects described respectively
The negative input end of five operational amplifiers, the first end of described 2.5k Ω resistance, the second end of described 2.5k Ω resistance connects respectively
Second end of described 0.55uF electric capacity, the outfan of the 5th operational amplifier and the positive input of described second difference operation unit
End, the negative input end of described first difference operation unit connects the first end of described 0.12uF electric capacity, described 4.8k Ω resistance respectively
The first end and the outfan of described 6th operational amplifier, the second end of described 0.12uF electric capacity connects described 3.1uF respectively
First end of electric capacity, the second end of 6.7k Ω resistance, the first end of described 10.1k Ω resistance, the second end of described 3.1uF electric capacity
Connect the second end and the negative input end of described 6th operational amplifier of described 4.8k Ω resistance, described 10.1k Ω resistance respectively
The second end ground connection, described 6.7k Ω resistance first end connect described second difference operation unit outfan, described 6th fortune
The positive input terminal calculating amplifier connects the positive input terminal of described 5th operational amplifier, the outfan of described first difference operation unit
Just connect the second end of described 1k Ω resistance, the positive pole of described 4th Zener diode, described 6th Zener diode respectively
Pole, the first end of described 2.47uF electric capacity, the first end of described 7k Ω resistance, the first end of described 2.2k Ω resistance, described
The negative pole of six Zener diodes connects the outfan of described 6th operational amplifier, the second end of described 0.33uF electric capacity respectively,
Second end of described 2.2k Ω resistance connects the first end of described 0.26uF electric capacity, the positive pole of described 5th Zener diode respectively
And the positive pole of described 7th Zener diode and the first end of described 4.89k Ω resistance, the second end of described 4.89k Ω resistance
Connect the positive input terminal of described 5th operational amplifier, the second end of described 2.47uF electric capacity, the second end of described 7k Ω resistance,
The negative pole of the second end of described 0.35uF electric capacity, the second end of described 0.26uF electric capacity and described 7th Zener diode connects
Ground.
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