CN101222235A - System and method for reducing uplink noise - Google Patents
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Abstract
A system and method for reducing uplink noise in a mobile communications device, the system including: a noise estimator for estimating noise in proximity to the mobile communication device; an adjustable filter for receiving a signal from a microphone of the mobile communication device; an adjustable attenuation block for receiving a filtered signal from the adjustable filter; a controller configured to: monitor the estimated noise; and adjust the adjustable filter and adjustable attenuation block based on the estimated noise. In particular, the controller may be configured to adjust the adjustable filter by increasing the depth of the filtering for higher estimated noise levels and adjust the attenuation by increasing the attenuation for higher estimated noise levels.
Description
Technical field
The application relates generally to noise and reduces, and particularly is used for reducing at noisy environment (for example in vehicle) system and method for the uplink noise of communication equipment.
Background technology
All using mobile communication equipment everywhere in the daily life.The aspect of a common use mobile communication equipment is to use mobile communication equipment usually in noisy environment.Especially, usually in tending to have the compartment such as analogs such as automobile, train, aircrafts of a large amount of low level background noises, use mobile communication equipment.
Therefore, a lot of money and make great efforts to develop the system and method that is used for being reduced in the noise in the signal of communication that noisy environment generates have been dropped into.The scope of these system and methods is to very complicated digital signal processing algorithm from very simple filtering.To generally include signal segmentation be a plurality of frames and each frame carried out multiple calculating than complicated algorithm, attempting removing noise from each frame, thereby removes noise from this signal.Regrettably, simpler method is not typically removed enough noises or has been caused voice signal more unintelligible; And complicated method is computation-intensive typically and disposal ability and processing time need be bigger, and to produce the signal of regulating, it is accompanied by and removes the relevant unpredictable effort of noise usually from signal.
Still need effectively and simple relatively (also promptly, more not computation-intensive) is used to reduce the system and method for the uplink noise on the signal of communication.
Summary of the invention
According to an aspect, a kind of method that is used for reducing the uplink noise of communication equipment is provided, this method comprises: at this communication equipment place receiving inputted signal; Estimate near the noise level that communication equipment is; Based on estimated level of noise this input signal is carried out filtering; And the signal of filtering is applied decay based on estimated level of noise.
Under specific situation, can comprise shelf-type (shelf) filtering based on the filter step of estimated level of noise.
Under another particular case, can comprise:, increase the filtering degree of depth for higher estimated level of noise based on the filter step of estimated level of noise.
Under another particular case, can comprise based on the filter step of estimated level of noise and to carry out filtering according to predefined function.In this case, this predefined function filtering that can be included in the filtering that applies 0dB before the first threshold of estimated level of noise, increase filtering and after second threshold value of estimated level of noise, apply predeterminated level with linear fashion.More particularly, this first threshold can be approximated to be 62dBA, and this second threshold value can be approximated to be 71dBA.
Under another particular case, the step that applies decay based on estimated level of noise can comprise: for higher estimated level of noise, increase decay.More generally, the step that applies decay based on estimated level of noise can comprise according to predefined function and applies decay.For example, this predefined function can comprise: apply predetermined decay after increasing decay and second threshold value in estimated level of noise in the decay that applies 0dB before the first threshold of estimated level of noise, with linear fashion.In addition, this first threshold can be approximated to be 70dBA, and this second threshold value can be approximated to be 76dBA.
According on the other hand, a kind of system that is used for reducing the uplink noise of mobile communication equipment is provided, this system comprises: the noise estimator that is used to estimate near the noise this mobile communication equipment; Be used for from the tunable filter of the microphone received signal of this mobile communication equipment; The adjustable damping module that is used for the signal that accepts filter from this tunable filter; Controller is arranged to the monitoring estimating noise and regulates tunable filter and adjustable damping module based on the noise of estimating.
Under specific situation, tunable filter can comprise the shelf-type filter.
Under another specific situation, controller can be arranged to based on the predefined function of the noise of estimating and regulate in tunable filter and the adjustable damping module each.
Under another specific situation, controller can be arranged to by increasing the filtering degree of depth for higher estimated level of noise and regulate tunable filter.In this case, the predefined function that is used for tunable filter is regulated this tunable filter after can being included in the first threshold of noise of estimation, is increased filtering and apply predetermined decay after second threshold value of the noise of estimating with linear fashion.In addition, this first threshold can be approximated to be 62dBA, and this second threshold value can be approximated to be 71dBA.
Under another specific situation, controller can be arranged to by increase decay for higher estimated level of noise and regulate decay.In this case, the predefined function that is used for the adjustable damping module is regulated decay after can being included in the first threshold of estimated level of noise, is increased decay and apply predetermined decay after second threshold value of estimated level of noise with linear fashion.In addition, this first threshold can be approximated to be 70dBA, and this second threshold value can be approximated to be 76dBA.
Description of drawings
In order to understand the embodiments described herein better and to clearly show that how to realize these embodiment, now will be with only as the mode of example, reference shows the accompanying drawing of exemplary embodiment, wherein:
Fig. 1 is the block diagram of the exemplary embodiment of mobile communication equipment;
Fig. 2 is the block diagram of exemplary embodiment of communication subsystem component of the mobile communication equipment of Fig. 1;
Fig. 3 is the block diagram of exemplary embodiment of the node of the wireless network that can communicate by letter with the mobile communication equipment of Fig. 1;
Fig. 4 is the functional block diagram of exemplary embodiment that is used to reduce the system of uplink noise;
Fig. 5 shows the diagram of tunable filter;
Fig. 6 shows according to the function of estimating noise level and to the diagram of the adjusting of tunable filter;
Fig. 7 shows according to the function of estimating noise level and to the diagram of the adjusting of adjustable damping module;
Fig. 8 is the table of parameter of having listed an embodiment of the system that is used for Fig. 5;
Fig. 9 shows before the embodiment of the system that uses Fig. 4 and the screen of voice/noise signal afterwards;
Figure 10 shows the diagram of the frequency response of signal when the embodiment of the system of service chart 4; And
Figure 11 is the flow chart of exemplary embodiment that is used to reduce the method for uplink noise.
Embodiment
Should be appreciated that simple and clear for illustration, think fit part in the accompanying drawings repeat reference numerals to indicate corresponding or similar element or step.In addition, many specific details have been proposed so that the complete understanding to exemplary embodiment described herein to be provided.Yet those of ordinary skill in the art should be appreciated that can not have to realize the embodiments described herein under the situation of these specific detail.In other cases, do not describe known method, process and assembly in detail, in order to avoid the embodiments described herein is caused fuzzy.In addition, this explanation should not be considered to limit by any way the scope of the embodiments described herein, and only is the execution mode of describing each embodiment described herein.
Some embodiment uses mobile communication equipment (being expressed as mobile device here sometimes), also promptly has the bi-directional communication device of advanced its communication ability, and this bi-directional communication device has the ability that communicates with wireless or wired mode and other computing equipment.This mobile device also can comprise the ability that is used for voice communication.According to the function that this mobile device provides, this mobile device can be expressed as data-message and transmit equipment, cell phone, wireless the Internet appliance or (having or do not have telephone capability) data communications equipment with data-message transmission capacity.The example of mobile communication equipment comprises cell phone, cellular smart phone, wireless messages organizer, personal digital assistant, handheld wireless communication device, has the notebook of wireless capability etc.Typically, this mobile device is communicated by letter with miscellaneous equipment by the network at transceiver station.This mobile device also can comprise and uses PAN (Personal Area Network) (PAN) technology (for example infrared, bluetooth etc.) and other mobile device or auxiliary device to carry out the ability of radio communication.
At first, show the block diagram of a mobile device 100 in the illustrative embodiments here with reference to Fig. 1.Mobile device 100 comprises many assemblies, and control assembly is the primary processor 102 of the overall operation of controlling mobile equipment 100.Carry out the communication function that comprises data and voice communication by communication subsystem 104.Communication subsystem 104 receives information and sending message from wireless network 200 to wireless network 200.In some execution mode of mobile device 100, come configuration communication subsystem 104 according to global system for mobile communications (GSM) and general packet radio service (GPRS) standard.The GSM/GPRS wireless network worldwide uses.Operable other standard comprises that enhanced data gsm environment (EDGE), global mobile communication business (UMTS), code division multiple access (CDMA) and integrated digital strengthen network (iDEN
TM) standard.Still, still believe that new standard will have and the similar behavior of network behavior described herein, it will be understood by those of skill in the art that the embodiments described herein can use any other suitable standard of following exploitation in the new standard of definition.Communication subsystem 104 is represented one or more different radio frequencies (RF) channel with the Radio Link that wireless network 200 links to each other, and this Radio Link is according to the protocol operation at GSM/GPRS signal post regulation.Use the procotol of upgrading, these channels can support circuit-switched voice communication and packet switched data communication.
Although the wireless network 200 that is associated with mobile device 100 is GSM/GPRS wireless networks in some embodiments, yet other wireless network also can be associated with mobile device 100 in other embodiments.For example, operable dissimilar wireless network comprises data-centered wireless network, is the wireless network at center and the dual-mode network by support voice and the data communication simultaneously of identical physical base station with voice.The dual-mode network of combination includes, without being limited to code division multiple access (CDMA) or CDMA2000 network, iDEN network, GSM/GPRS network (as indicated above) and following third generation (3G) network (as EDGE and UMTS).Other example of some of data-centered network comprises WiFi802.11, Mobitex
TMAnd DataTAC
TMNetwork communicating system.Other is that the example of the data network at center comprises PCS Personal Communications System (PCS) network with voice, as GSM and time division multiple access (TDMA) system.
Some subsystem of mobile device 100 is carried out the function relevant with communication, and other subsystem can provide the function on " residing " or the equipment.For example, display 110 and keyboard 116 can be used for the function (for example calculator or task list) with relevant function of communicating by letter (for example input of text messages to be used for transmit) and resident devices on wireless network 200.Typically, the operating system software that primary processor 102 is used is stored in the permanent memory such as flash memory 108, and alternatively, this permanent memory can be read-only memory (ROM) or similar memory element (not shown).It will be understood by those of skill in the art that and this operating system, specific equipment can be used or its part is loaded in the volatile memory such as RAM 106 provisionally.
After having finished required network registry or activation, mobile device 100 can send and receiving communication signal by wireless network 200.Network insertion is associated with the subscriber or the user of mobile device 100.In order to identify the subscriber, mobile device 100 may need SIM/RUIM card 126 (also being subscriber identity module or removable user identity module) is inserted SIM/RUIM interface 128, so that and network service.Therefore, SIM card/RUIM126 and SIM/RUIM interface 128 are optional fully.
SIM card or RUIM126 are a kind of traditional " smart cards ", can be used to identify the subscriber of mobile device 100 and make that mobile device 100 is individualized.Do not having under the situation of SIM card, mobile device 100 is not can operate fully to be used for communicating by letter with wireless network 200.By SIM card/RUIM126 is inserted SIM/RUIM interface 128, the subscriber can visit the service of all orders.Service can comprise: web page browsing and message transmission, for example Email, voice mail, Short Message Service (SMS) and Multimedia Message service (MMS).More advanced persons' service can comprise: point of sales terminal, on-the-spot service and sales force automation.SIM card/RUIM126 comprises processor and is used for the memory of stored information.In case SIM card/RUIM126 is inserted SIM/RUIM interface 128, and SIM card/RUIM126 just is coupled to primary processor 102.In order to discern the subscriber, SIM card/RUIM126 comprises certain user's parameter, for example international mobile subscriber identity (IMSI).Using the advantage of SIM card/RUIM126 is the restriction that the subscriber needn't be subjected to any single physical mobile device.SIM card/RUIM126 can comprise notepad (or calendar) information and nearest call information for the additional subscriber information of mobile device storage.Alternatively, also customer identification information can be programmed in the flash memory 108.
Except operation system function, primary processor 102 can also be on mobile device 100 executive software application program 134.During the manufacturing of mobile device 100, the common subclass (comprising data and voice communication application) of the software application 134 of installation and control basic device operations on mobile device 100.Program 134 can comprise e-mail program, web browser, annex reader etc.
PIM140 has the function of the data items (such as but not limited to Email, calendar event, appointment and task items) that is used for the organization and management subscriber and is paid close attention to.The PIM application program has via the transmit and receive data ability of project of wireless network 200.Can use the corresponding data project of mobile device subscribers that stored and/or relevant with host computer system, seamlessly integrated via wireless network 200, synchronous and renewal pim data project.This function has been created the mirrored host computer about this project on mobile device 100.This is useful especially when this host computer system is the office computer system of mobile device subscribers.
Can also pass through at least one in wireless network 200, auxiliary I/O subsystem 112, FPDP 114, short-range communication subsystem 122 or other the suitable equipment subsystems, additional application program is loaded on the mobile device 100.Flexibility during this application program is installed has increased the function of mobile device 100, and function on the equipment of enhancing and/or the function relevant with communication can be provided.For example, secure communication applications makes it possible to use mobile device 100 to carry out e-business capability and other this financial affairs.
FPDP 114 makes the subscriber preferential selection to be set by external equipment or software application, and by need not to provide information or software download via cordless communication network to mobile device 100, has expanded the ability of mobile device 100.For example, can use standby download path,, encryption key be downloaded on the mobile device 100, so that safe devices communicating to be provided via being connection reliable and trusty therefore directly.
FPDP 114 can be to realize any suitable port of mobile device 100 and another data communications between computing devices.This FPDP can be the serial or parallel port.In some examples, FPDP 114 can be the USB port that comprises the data wire that is used for transfer of data and the power line of charging current to charge to mobile device 100 can be provided.
Short-range communication subsystem 122 is providing communicating by letter between mobile device 100 and other mobile device, computing system or the auxiliary device under the situation of not using wireless network 200.For example, subsystem 122 can comprise the wireless transmitter/receiver that is used for junction service and relevant circuit and assembly.The example of junction service standard comprises the standard developed by Infrared Data Association (IrDA), bluetooth and by 802.11 standard families that IEEE developed.These junction service standards allow between mobile device and the auxiliary device or among form wireless connections, and in some cases, allow to form the PAN (Personal Area Network) (PAN) that comprises a plurality of equipment.Be described in more detail below the foundation of junction service.
In use, primary processor 102 be handled and be input to the signal of reception (for example text message, email message or page download) will by communication subsystem 104.Primary processor 102 is handled the signal that receives and is assisted I/O subsystem 112 to export display 110 to or to export to alternatively then.For example, the subscriber can also use keyboard 116 in conjunction with display 110 and (possibly) auxiliary I/O subsystem 112, writes the data items such as email message.Assistant subsystem 112 can comprise such as touch-screen, mouse, trace ball, infrared fingerprint detector or have the equipment of the roller of Dynamic Button ability.Preferably, keyboard 116 is alphanumeric keyboard and/or telephong type keyboard.Yet, also can use the keyboard of other type.Can on wireless network 200, transmit the project of being write via communication subsystem 104.
For voice communication, except the signal that will receive exports loud speaker 118 to and generated the signal that is used to transmit by microphone 120, the overall operation of mobile device 100 comes down to similarly.Also can on mobile device 100, realize optional voice or audio frequency I/O subsystem, for example speech message recording subsystem.Although mainly realize voice or audio signal output, also can use display 110 so that additional message to be provided, for example the duration of the identity of calling party, audio call or other information relevant with audio call by loud speaker 118.
Referring now to Fig. 2, show the block diagram of exemplary embodiment of the communication subsystem of Fig. 1.Communication subsystem 104 comprises receiver 150 and transmitter 152 and relevant assembly, for example one or more embeddings or inner antenna element 154,156, local oscillator (LOs) 158 and the communication processor 160 that is used for radio communication.Communication processor 160 can be digital signal processor (DSP).Technical staff for the communications field it is evident that, the particular design of communication subsystem 104 be can be depending on mobile device 100 be intended to the communication network that uses it to operate.Therefore, should be appreciated that design illustrated in fig. 2 is only as example.
To input to receiver 150 via wireless network 200, the signal that received by antenna 154, receiver 150 can be carried out such as signal amplification, down-conversion, filtering, channel and select and the common receiver function of modulus (A/D) conversion.A/D conversion to received signal allows more complicated communication function, for example will be by the demodulation sign indicating number of communication processor 160 execution.Communication processor 160 is handled the signal that (comprise modulation and coding) will transmit in a similar fashion.These signals of having handled are inputed to transmitter 152 to be used for digital-to-analogue (D/A) conversion, up-conversion, filtering, amplification and to transmit on wireless network 200 via antenna 156.Communication processor 160 is process communication signals not only, and Receiver And Transmitter control is provided.For example, can control the gain/attenuation that the signal of communication in receiver 150 and transmitter 152 applies adaptively by the automatic gain/decay control algolithm that in communication processor 160, realizes.
The related protocol that mobile device 100 can comprise one or more different channels (different typically RF channels) and use between mobile device 100 and wireless network 200 with Radio Link between the wireless network 200.Typically owing to the restriction of overall bandwidth and the limited battery electric power of mobile device 100, the RF channel is the limited resources that must save.
When mobile device 100 complete operations, typically, only when wireless network 200 sends, connect or unlatching transmitter 152, otherwise close transmitter 152 to economize on resources at transmitter 152.Similarly, periodically close receiver 150, unless during the period of appointment, need receiver 150 received signals or information (if any) with conservation of power.
Referring now to Fig. 3, the block diagram of the illustrative embodiments of the node of wireless network 200 is illustrated as 202.In practice, wireless network 200 comprises one or more nodes 202.Mobile device 100 is communicated by letter with node 202.In the illustrative embodiments of Fig. 3, come configuration node 202 according to general packet radio service (GPRS) and global mobile system (GSM) technology.Node 202 comprises base station controller (BSC) 204 with associated column station 206, is added the packet control unit (PCU) 208, mobile switching centre (MSC) 210, attaching position register (HLR) 212, Visited Location Registor (VLR) 214, Serving GPRS Support Node (SGSN) 216, Gateway GPRS Support Node (GGSN) 218 and the DHCP (DHCP) 220 that are used for supporting at GSM GPRS.This component list does not also mean that the exclusive list of the assembly that is each node 202 in the GSM/GPRS network, but the tabulation of the assembly that can in the communication by wireless network 200, use.
In the GSM network, MSC210 is coupled to BSC204 and ground network (for example public switched telephone network (PSTN) 222) to satisfy the circuit switching demand.The data path that representative is used to have the mobile device of GRPS ability that is connected via PCU208, SGSN216 and GGSN218 and public or dedicated network (internet) 224 (also being expressed as shared network infrastructure here usually).Have in the GSM network of GPRS ability in expansion, BSC204 also comprises the packet control unit (PCU) 208 that links to each other with SGSN216, is used to control segmentation, Radio Channel Assignments and satisfies the packet switching demand.In order to follow the tracks of position of mobile equipment and the availability that is used for circuit switching and packet switched management, sharing HLR 212 between MSC210 and SGSN216.By the visit of MSC210 control to VLR214.
Stand 206 is transceiver stations of fixing.Stand 206 and BSC204 formed this fixing transceiver device jointly.Transceiver device that should be fixing provides the wireless network covering for the particular coverage that is commonly called " sub-district ".Transceiver device that should be fixing transfers to signal of communication via station 206 mobile device in the sub-district of this fixing transceiver device, and the signals of communication that receive from the mobile device in the sub-district of this fixing transceiver device via station 206.Be somebody's turn to do fixing transceiver device usually under the control of its controller, according to specific (normally being scheduled to) communication protocol and parameter, to being transferred to signal execution such as the function of modulating and (possibly) encodes and/or encrypt of mobile device 100.Similarly, if necessary, any signal of communication that this fixing transceiver device receives the mobile device in its sub-district 100 carries out demodulation and (possibly) decoding and deciphering.Communication protocol can be different for different nodes with parameter.For example, node can use the modulation scheme different with other node and with the frequencies operations different with other node.
For all mobile devices 100 in the particular network registration, the permanent configuration data of storage such as user profiles in HLR212.HLR212 also comprises the positional information of the mobile device of each registration, and can inquire about HLR2 12 to determine the current location of mobile device.MSC210 is responsible for one group of band of position, and with the current storage of mobile device in it is responsible for the zone in VLR214.In addition, VLR214 also comprises and the relevant information of mobile device of visiting other network.Information among the VLR214 comprises a part that transfers to the permanent mobile device data of VLR214 from HLR212, so that visit faster.By additional information is moved to VLR214 from long-range HLR212 node, can reduce the traffic carrying capacity between these nodes, therefore the voice-and-data service that has response time faster and need to use computational resource still less simultaneously can be provided.
SGSN216 and GGSN218 are added the element that the GPRS that is used in the GSM supports (also being the packet switched data support).SGSN216 and MSC210 in the wireless network 200 have similar responsibility by the position of following the tracks of each mobile device 100.SGSN216 also carries out safety function and access control to the data service on the wireless network 200.GGSN218 provide with external packet-switched between network be connected, and via in wireless network 200 operation Internet Protocol (IP) backbone network link to each other with one or more SGSN216.In normal operating period, specific mobile device 100 must be carried out " GPRS adheres to " to obtain IP address and access data services.Do not have this demand in the circuit switched voice channel, this is owing to use integrated services digital network network (ISDN) address to come route is carried out in the calling of input and output.Current, all networks with GPRS ability use the IP address of special-purpose dynamic assignment, thereby need Dynamic Host Configuration Protocol server 220 to link to each other with GGSN218.Exist to be used for many mechanism that dynamic IP is distributed, comprise the combination of using remote authentication dial-in customer service (RADIUS) server and Dynamic Host Configuration Protocol server.Adhere in case finished GPRS, just set up from mobile device 100 and arrived being connected of access point (APN) in the GGSN218 via PCU208 and SGSN216.The APN representative can be visited the logic terminal point of the IP tunnel of direct compatible with internet service or dedicated Internet access.APN also represents the security mechanism that is used for wireless network 200, wherein each mobile device 100 must be distributed to one or more APN, and under the situation that the GPRS that does not at first carry out the APN that is authorized to use to mobile device 100 adheres to, mobile device 100 can not swap data.Can think that APN is with similar such as the internet domain name of " myconnection.wireless.com ".
Adhere in case finished GPRS, just created the tunnel, and use the IP supported any agreement of dividing into groups, in standard I P grouping, exchange all business.This comprises tunnel approach, for example the IP-based IP under the situation that some IPSecurity (IPsec) that VPN(Virtual Private Network) uses connects.This tunnel is also referred to as packet data protocol (PDP) context, and has this available tunnel of limited quantity in wireless network 200.In order to maximize the use to PDP Context, wireless network 200 will move idle timer to determine whether using (activity) at each PDP Context.When mobile device 100 does not use its PDP Context, can discharge PDP Context and the IP address is back to IP address pool by Dynamic Host Configuration Protocol server 220 management.
With common mobile device environment mentioned above exemplary environments, the exemplary embodiment of the system and method that is used to reduce uplink noise is described as communication.Should be appreciated that the system and method that is used for reducing uplink noise also is used in other communication systems that noisy environment uses.
Fig. 4 is the block diagram of illustrative embodiments that is used to reduce the system 300 of uplink noise.This system 300 comprises noise estimator 305, tunable filter 310, adjustable damping module 315 and controller 320.System 300 is arranged between the microphone 120 and the other treatment element (not shown among Fig. 4) in the mobile device 100 of mobile device 100.
As shown in Figure 4, microphone 120 receives the composite signal of speech plus noise and this signal is passed to tunable filter 310, also this signal is sent to noise estimator 305 simultaneously.Noise estimator 305 these signals of monitoring are to create the estimation to the signal level in the environment of microphone 120.The estimation to noise of self noise estimator 305 in the future offers controller 320, and controller 320 is regulated tunable filter 310 based on the predefined function of the Noise Estimation that is provided.Tunable filter 310 is applied to signal from microphone, and the signal of filtering is sent to adjustable damping module 315.Also regulate adjustable damping module 315 based on the predefined function of estimated level of noise.Send the signal of adjusting then to be used for further processing.For example should be appreciated that, the part of the communication subsystem 104 that system 300 described herein can be a mobile device 100, and further processing can comprise the preparation of the signal that is used to transmit etc.
Fig. 6 shows and can be used to regulate the simple linear function of tunable filter 310 by controller 320.Generally speaking, when noise level is low, do not apply filtering to signal.After reaching first threshold, filtering begins and increases gradually, and up to reaching second threshold value, after second threshold value, filtering will remain on predetermined degree.
For example, as shown in Figure 5, filter will allow higher frequency to carry out decay such as 20dB by (decay of 0dB) and to lower frequency.Should be appreciated that controller 320 also can regulate the transition frequency of tunable filter 310 or by frequency based on noise level.Therefore, at lower noise level place, can apply filtering with less frequency range and lower amplitude, and at higher noise level place, filtering can cover bigger frequency range and and be in higher amplitude.When controller 320 was just controlled tunable filter 310 in a scope, the simplest function is linear function normally, so that along with noise level increases, increased filter amplitude and the lower frequency of filtering gradually.Yet various other functions also are possible, and the amplitude of the type of employed tunable filter 320 and filtering and frequency can change according to the type of the noise in the environment.
Under the particular case about the noise (tending to is low-frequency noise) of the vehicles, using the high pass tunable filter to reduce that low-frequency noise is considered to is being shockingly effective aspect the voice intelligibility that increases on the up link.
As tunable filter 310, adjustable damping module 315 also can be an assembly traditional or that after this develop.Controller 320 provides adjustable damping module 315 so that can be regulated the decay of the signal of filtering based on the predefined function of noise level.The predefined function that is used to regulate adjustable damping module 315 can be identical, similar or inequality with the predefined function that is used to regulate tunable filter 310.In traditional system, use gain module with increase/amplifying signal usually, still, suitable execution mode is opposite with being considered to, and in the present embodiment, in fact increases decay with noise level.Therefore, in more low noise environment, decay is set to medium (neutral).Along with the noise level in the environment increases, controller 320 is regulated adjustable damping module 315, regulates De Genggao will decay according to the predefined function of noise level, and continues to increase decay until reaching predetermined threshold.Fig. 7 shows and can controlled device 320 use to regulate the exemplary simple linear function of decay based on estimated level of noise.
Although paying close attention to, this illustrative embodiments comprises two threshold values being used between estimated level of noise (ENL) and the filtering degree of depth and decay conversion and the filtering and the attenuation function of linearity (in the log/dB territory) function, it will be understood by those of skill in the art that and have operable various other function or variation.For example, in order under the prerequisite that does not excessively increase computation complexity, to provide more complicated function, can consider a class piecewise linear function.Can also realize continuous function or sectional-continuous function.In addition, should be appreciated that " transition " frequency and/or the cut-off frequency that to regulate tunable filter according to the function of ENL.In addition, can use and/or change other filter shape, for example, can carry out preemphasis to tunable filter 310 according to the function of ENL based on ENL.
The reason that increases decay according to the function of cumulative noise is relevant with the phenomenon that is called as the Lombard effect.The Lombard effect is that human talker will typically improve the title of the phenomenon of his/her volume in noisy environment.The aspect of being paid close attention to that helps this Lombard effect of the exemplary embodiment here is, human speakers usually with his/her voice with respect to their common level that conversational speech improved than noise with respect to higher level that muting environment exceeded.Therefore, will when reducing The noise, improve the definition of voice to the increase of the decay of the signal that comprises voice and noise.
Be, experiment shows with attracting people's attention, and in noisy environment, the system 300 of exemplary embodiment with combination of shelf-type filtering and cumulative decay has surprising effect aspect the noise reduction.
Have in the experiment that the example system 300 of the parameter shown in the table of Fig. 8 carried out in use, as shown in Figure 9, this system 300 can produce the noise that is similar to 10dB and reduce in the Noise Background (floor) of signal.Fig. 9 shows before application system 300 and voice signal afterwards and noise.In this particular example, tunable filter 310 is shelf-type filters of the side-play amount of the maximum attenuation of the minimal attenuation of cut-off frequency (Fc) with 1200Hz, 0dB and 9dB and 62dBA.Controller 320 control tunable filters 310, so that at all frequencies that are lower than Fc, the every increase of estimated level of noise 1dB, decay increases 1.5dB.Aspect frequency, tunable filter 310 is set to begin and finish at the Fc place at the section start of voice wave band.Similarly, be set to provide the minimal attenuation of 0Db and the maximum attenuation of 3dB, and have the side-play amount of 70dB adjustable damping module 315.The side-play amount of adjustable damping module 315 is higher than the side-play amount of tunable filter 310, and this is because whole wave band is applied decay.Controller 320 control adjustable damping modules 315, so that the every increase of estimated level of noise 1dB, decay increases 0.5dB.Figure 10 shows the typical uplink frequency response of the system 300 that experiment as mentioned enables.
Figure 11 is the flow chart of illustrative methods 1100 that is used for reducing the uplink noise of communication equipment.Usually can be according to above this method 1100 being understood in the description of system 300.Then, provide Figure 11 so that clearer.This method 1100 begins (1110) when receiving signal, for example receive signal at the microphone place of this communication equipment.At 1120 places, detect the ambient noise level in the environment of this communication equipment.At 1130 places, come this signal is carried out filtering based on detected noise level.At 1140 places, come this signal is decayed then based on detected noise level.Transmit this signal at 1150 places by this communication equipment then.Should be appreciated that preferably, carry out this method in adaptive mode so that this signal that will transmit the duration be similar to and carry out this filtering and decay continuously.
Should be appreciated that can by (for example in the memory or computer-readable medium on) certain of software or hardware or software and hardware makes up this system 300 and the method 1100 implemented.Similarly, can in the communication subsystem 104 of microprocessor 102 or mobile device 100 or its assembly, provide system 300, and/or by the communication subsystem 104 of microprocessor 102 or mobile device 100 or its assembly come manner of execution 1100 (for example, communication subsystem 104 can comprise can corresponding modify the adjustable damping module).In addition, the assembly of system 300 can be simulated assembly or digital assembly.It will be understood by those of skill in the art that under the situation of digital assembly, between simulation microphone and system 300, provide analog to digital converter usually.
Should be appreciated that and can carry out various modifications here the illustrative embodiments of describing and illustrating, and the general range that does not deviate from appended claim.Especially, though should be appreciated that and described the execution mode that is used for mobile communication equipment, execution mode can be applied to the communication equipment that uses at large in noisy environment.
Claims (18)
1. method that is used for reducing the uplink noise of communication equipment, described method comprises:
At described communication equipment place receiving inputted signal;
Estimate near the noise level that communication equipment is;
Come described input signal is carried out filtering based on estimated level of noise; And
Come the signal of filtering is applied decay based on estimated level of noise.
2. method according to claim 1, wherein, described step of carrying out filtering based on estimated level of noise comprises any one in following: shelf-type filtering, increase the filtering degree of depth or carry out filtering according to predetermined function for higher estimated level of noise.
3. method according to claim 2, wherein, the described predetermined function filtering that is included in the filtering that applies 0dB before the first threshold of estimated level of noise, increases filtering and after second threshold value of estimated level of noise, apply predeterminated level with linear fashion.
4. method according to claim 3, wherein, described first threshold is approximately 62dBA, and described second threshold value is approximately 71dBA.
5. method according to claim 1, wherein, the described step that applies decay based on estimated level of noise comprises: for higher estimated level of noise, increase decay; Perhaps apply decay according to predetermined function.
6. method according to claim 5, wherein, described predetermined function is included in the decay that applies 0dB before the first threshold of estimated level of noise, increases decay and apply predetermined decay after second threshold value of estimated level of noise with linear fashion.
7. method according to claim 6, wherein, described first threshold is approximately 70dBA, and described second threshold value is approximately 76dBA.
8. system that is used for reducing the uplink noise of mobile communication equipment, described system comprises:
Be used to estimate near the noise estimator of the noise the described mobile communication equipment;
Be used for from the tunable filter of the microphone received signal of described mobile communication equipment;
The adjustable damping module that is used for the signal that accepts filter from described tunable filter;
Controller is arranged to:
The noise that monitoring is estimated; And
Regulate described tunable filter and described adjustable damping module based on the noise of estimating.
9. system according to claim 8, wherein, described tunable filter comprises the shelf-type filter.
10. system according to claim 8, wherein, described controller is arranged to based on the predefined function of the noise of estimating and regulates in described tunable filter and the described adjustable damping module each.
11. system according to claim 8, wherein, described controller is arranged to by increasing the filtering degree of depth for higher estimated level of noise or based on the predefined function of the noise of estimating, regulating described tunable filter.
12. system according to claim 11, wherein, the predefined function that is used for described tunable filter is arranged to: regulate described tunable filter after the first threshold of the noise of estimating, increase filtering and apply predetermined decay after second threshold value of the noise of estimation with linear fashion.
13. system according to claim 12, wherein, described first threshold is approximately 62dBA, and described second threshold value is approximately 71dBA.
14. system according to claim 8, wherein, described controller is arranged to: regulate described decay by increase decay for higher estimated level of noise, perhaps be used for regulating described decay according to the predefined function of the noise of estimating.
15. system according to claim 14, wherein, the predefined function that is used for described adjustable damping module is arranged to: regulate decay after the first threshold of estimated level of noise, increase decay and apply predetermined decay after second threshold value of estimated level of noise with linear fashion.
16. system according to claim 15, wherein, described first threshold is approximately 70dBA, and described second threshold value is approximately 76dBA.
17. a computer-readable medium that stores instruction makes described processor enforcement of rights require the arbitrary described method of 1-7 when carrying out described instruction on processor.
18. communication equipment with the arbitrary described system of claim 8-16.
Applications Claiming Priority (2)
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| EP06124725.0 | 2006-11-24 | ||
| EP06124725A EP1926085B1 (en) | 2006-11-24 | 2006-11-24 | System and method for reducing uplink noise |
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| CN101222235A true CN101222235A (en) | 2008-07-16 |
| CN101222235B CN101222235B (en) | 2012-07-04 |
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| EP (1) | EP1926085B1 (en) |
| CN (1) | CN101222235B (en) |
| AT (1) | ATE487214T1 (en) |
| CA (1) | CA2611222C (en) |
| DE (1) | DE602006018030D1 (en) |
| SG (1) | SG143204A1 (en) |
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|---|---|---|---|---|
| CN117040625A (en) * | 2023-09-26 | 2023-11-10 | 福建金石电子有限公司 | 5G-based noise control method and system for optical fiber distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9058819B2 (en) | 2006-11-24 | 2015-06-16 | Blackberry Limited | System and method for reducing uplink noise |
| EP2232703B1 (en) | 2007-12-20 | 2014-06-18 | Telefonaktiebolaget LM Ericsson (publ) | Noise suppression method and apparatus |
| WO2009082302A1 (en) * | 2007-12-20 | 2009-07-02 | Telefonaktiebolaget L M Ericsson (Publ) | Noise suppression method and apparatus |
| KR101475864B1 (en) | 2008-11-13 | 2014-12-23 | 삼성전자 주식회사 | Apparatus and method for eliminating noise |
| GB2519117A (en) | 2013-10-10 | 2015-04-15 | Nokia Corp | Speech processing |
| US10157627B1 (en) * | 2017-06-02 | 2018-12-18 | Bose Corporation | Dynamic spectral filtering |
| CN114650072B (en) * | 2022-03-24 | 2024-04-09 | 维沃移动通信有限公司 | Signal processing method, signal processing device, electronic apparatus, and readable storage medium |
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| JP3626492B2 (en) * | 1993-07-07 | 2005-03-09 | ポリコム・インコーポレイテッド | Reduce background noise to improve conversation quality |
| ATE306781T1 (en) | 2000-05-18 | 2005-10-15 | Ericsson Inc | NOISE-ADAPTIVE COMMUNICATION SIGNAL LEVEL CONTROL |
| WO2004068467A1 (en) * | 2003-01-31 | 2004-08-12 | Oticon A/S | Sound system improving speech intelligibility |
| CN100426378C (en) * | 2005-08-04 | 2008-10-15 | 北京中星微电子有限公司 | Dynamic noise eliminating method and digital filter |
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2006
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117040625A (en) * | 2023-09-26 | 2023-11-10 | 福建金石电子有限公司 | 5G-based noise control method and system for optical fiber distribution system |
| CN117040625B (en) * | 2023-09-26 | 2023-12-08 | 福建金石电子有限公司 | 5G-based noise control method and system for optical fiber distribution system |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1926085B1 (en) | 2010-11-03 |
| EP1926085A1 (en) | 2008-05-28 |
| DE602006018030D1 (en) | 2010-12-16 |
| CN101222235B (en) | 2012-07-04 |
| ATE487214T1 (en) | 2010-11-15 |
| CA2611222C (en) | 2011-12-20 |
| SG143204A1 (en) | 2008-06-27 |
| CA2611222A1 (en) | 2008-05-24 |
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