CN101076204A - Hearing aid equipment with feedback detection and corresponding method - Google Patents
Hearing aid equipment with feedback detection and corresponding method Download PDFInfo
- Publication number
- CN101076204A CN101076204A CNA200710109756XA CN200710109756A CN101076204A CN 101076204 A CN101076204 A CN 101076204A CN A200710109756X A CNA200710109756X A CN A200710109756XA CN 200710109756 A CN200710109756 A CN 200710109756A CN 101076204 A CN101076204 A CN 101076204A
- Authority
- CN
- China
- Prior art keywords
- feedback
- signal
- hearing
- signal processing
- aid device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
- H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Neurosurgery (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The system has a modifiable signal processing device between a microphone (11) and a handset. A feedback path from the microphone to the handset produces corresponding resonance characteristics of the system dependent on adjustment of the signal processing device. An analysis device analyses the resonance characteristics dependent on modification of the signal processing device, and determines feedback volume, which represents a size for feedback, from a result of the analysis. An independent claim is also included for a method for detecting a feedback in a digital hearing system.
Description
Technical field
The present invention relates to a kind of hearing-aid device, it has signal input apparatus, signal output apparatus, the revisable signal processing apparatus between signal input apparatus and signal output apparatus, and have the feedback path from the signal output apparatus to the signal input apparatus, by the setting generation resonance signal of this feedback path according to signal processing apparatus.In addition, the invention still further relates to the method for a kind of relevant detection feedback in the hearing-aid device.A kind of such hearing-aid device is hearing aids particularly, but also can be telephone headset and similar devices.
Background technology
If in signal processing system, between input and output, have coupling (for example coupling of sound, electromagnetism, electricity, magnetic etc.), then have the danger that feedback effect occurs.An a kind of like this example of equipment is the hearing aids of schematically representing in Fig. 1.This hearing aids can be used as digital system 1 expression, and it is arranged in an environment provided.Microphone 2 for example constitutes input.The signal that is picked up at first is exaggerated and exports again by receiver 3.Carry out from receiver 3 to microphone 2 acoustic feedback by a physical feedback path 4.Because this feedback, feedback singing appears when amplitude and phase condition all are satisfied.The sound artefact has only appearred when above-mentioned condition when satisfying also.
For suppressing feedback effect, known a kind of method, wherein digital copy physical feedback path 4.This duplicates by a sef-adapting filter 5 and is undertaken, for this filter provides the receiver signal.The receiver signal is again from the signal processing unit in the hearing aids 6, and it receives microphone signal and at first amplifies.After the filtering in the adaptive equalization filter, the receiver signal is deducted from microphone signal in adder 7.
Therefore, in this system, there are two paths, the feedback path 4 that first physics exists, another is the digital compensation path of duplicating by sef-adapting filter 5.Because the consequential signal in two paths deducts in the input of this equipment mutually, so the effect in physical feedback path 4 is cancelled in ideal conditions.
At one of the adaptive algorithm that is used for the Compensation Feedback path important part is its step pitch control.Its which type of speeds match physical feedback path 4 of regulation adaptive equalization filter 5 usefulness.Because do not have any significant compromise for the fixing step pitch of setting, so itself and this present each real situation of system is complementary.Must pursue a big step pitch with the quick coupling in physical feedback path 4 for adaptive equalization filter 5 on the principle.Yet shortcoming is to produce perceptible signal artefact under the situation of this big step pitch.
For one far below critical feedback, step pitch should be little to disappearing.In contrast, if critical feedback scenario, step pitch should be big.Guarantee thus, only when the characteristic remarkable in the feature of adaptive equalization filter 5 and physical feedback path 4 not simultaneously that is when existence during to the demand of adjustment again, algorithm is just adjusted adaptive equalization filter 5.
A kind of method that is used in hearing aids identification feedback is disclosed among patent specification DE 199 04 538 C1.At this, determine a frequency band, in this frequency band, determine one first signal level to be decayed by this signal on a segment signal transmission range of hearing aids, and in this frequency band, determine a secondary signal level of the signal after this decay.According to first and second signal levels of determining, can discern feedback.Yet under the situation of the level fluctuation of input signal, be difficult to determine the quantity of feedback.Another shortcoming is that the intervention that the meeting appearance can be heard in forward signal path only can be carried out slow detection feedback, in addition because in turn search frequency band according to desirable mode.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is, can discern the feedback of hearing-aid device reliably.
According to the present invention, this technical problem solves by a kind of hearing-aid device, described hearing-aid device has signal input apparatus, signal output apparatus, revisable signal processing apparatus between signal input apparatus and signal output apparatus, feedback path from the signal output apparatus to the signal input apparatus, and analytical equipment, by the corresponding resonance behavior that this feedback path produces this hearing-aid device according to the setting of signal processing apparatus, the feedback size that described analytical equipment is used for depending on the modification analysis resonance behavior of signal processing apparatus and determines the degree of expression feedback from analysis result.
In addition, according to the invention provides a kind of method that is used for detecting the feedback of hearing-aid device, its signal processing is set and feedback determines a kind of resonance behavior together, the signal processing by revising hearing-aid device, analyzes the resonance behavior and determine the feedback size of expression feedback degree from analysis result according to the modification of signal processing.
Input signal, output signal and feedback signal as mentioning when this paper begins, are the signals of character such as sound, electromagnetism, electricity, magnetic.The system features of feedback regulation whole system under each situation, and the working point of system and natural resonance change by system.
For detection feedback, the parameter of signal processing apparatus can automatically be revised all the time.Thus need be about any knowledge of feedback, because all the time in definite feedback degree.
As an alternative, hearing-aid device has a feedback estimation unit, the modification of enabling signal processing unit when it surpasses the degree of regulation in feedback about quantity and/or quality.Particularly this feedback estimation unit can comprise an oscillating detector, can determine a resonance frequency of system with it, and it is targetedly by the analytical equipment analysis.Before detailed detection feedback, estimate feedback according to the vibration that occurs by oscillating detector.Only in the modification that signal processing occurs just carrying out under the situation about feeding back, can audible danger in this total generation.
Preferably, for detection feedback in signal processing apparatus for a signal excute phase to be processed revise, revise and/or amplitude modification running time.This system revises and can carry out simply.
Preferably, this signal processing is being changed between the two states at least, continuous replacing gradually perhaps taken place between these states.Like this, can replace constantly synchronously constantly or gradually with each conversion simply resonance behavior, particularly Analysis of resonance frequency.
Hearing-aid device of the present invention can have feedback compensation filter, and its self adaptation step pitch is by the feedback size decision of analytical equipment.Further reduce the audibility that compensates by this measure.
Description of drawings
Describe the present invention with reference to the accompanying drawings in detail, in the accompanying drawing,
Fig. 1 represent according to the signal processing system that has feedback of prior art and
Fig. 2 represents a kind of reduced representation according to feedback detector of the present invention.
Embodiment
The embodiment that describes in detail below represents preferred embodiment of the present invention.
One self owing to feedback path is in coupling boundary vicinity or the system on it, change signal to be processed or unstable and vibration.
Under the situation of linear time invariant system, the Systems Theory prophesy is vibrated in one or more frequency.This harmonic oscillation needn't distinguished with the vibration that produces as the useful signal in stable system in other observation on the priori.Yet if this its feature of unsettled system changes definitely, this shows in the change of the resonance behavior of system, and shows in the change of harmonic signal thus.Therefore, a kind of feedback has been pointed out in the change in the harmonic signal relevant with the specific change of system action.Detector can correspondingly be observed this signal behavior and react under the situation of feedback.
Revising the basic premise that carries out detection feedback by system is that system revises and self can not be heard.
Correspondingly, the first simple execution mode is to move one all the time in the modification unit of work in the numerical portion of whole system, is unessential in this accurate localization.As long as the signal of corresponding modify occurs having, then there is feedback, and for example can detects according to the change of resonance frequency as system's correction result of system.As system's modification if any:
-phase modification: the phase place of a signal is revised according to the time graph of determining, for example linearity is forward, linearity rotates backward, and linearity forward and backward vibration is rotated,
Revise-running time (being closely connected) with phase modification,
-amplitude modification: temporal envelope is revised as sinusoid.
According to the execution mode of an expansion of the present invention, have only and suspect that just carrying out system when having feedback revises.For example, if in system, recognize one or more harmonic signal, then set up a kind of suspection by the oscillating detector of a routine.In this case, this system once can not be listened insight to revise.For example in the circulation of a sealing of system, phase place once and is definitely rotated to a new feature.Therefore, the resonance-characteristic of system, particularly characteristic frequency disposable and can change with detecting.This shows by the change of singing in tone that usually takes place when the resonance.
The advantage of always revising is not, system is revised only to be needed to work when suspecting.Otherwise this system with introduce modified module before the same performance, perhaps a kind of can retainable variation be static, that is constant on the time.Therefore, can avoid that in entire equipment, to occur and the interactions other system parts.In the example of hearing aids, this may mean, avoided from the modulated signal component of hearing aids and the unmodulated signal component that flows into (Ventzufluss) by a valve undesirable, the time interaction that becomes.
Generally suspecting that the following system features of situation that has feedback can not listen insight to change or replace gradually continuously between two or more states.The response prompting feedback singing of carrying out thus about the feature of harmonic signal, that is point out a kind of (postcritical) feedback scenario.If signal characteristic is constant, then only have and use spectral component, that is do not have any feedback scenario, therefore detect less than any feedback.
According to testing result setting compensation self adaptation of filter step pitch.Detecting under the situation of modification the high setting of step pitch.This point can be for certain, fixing official hour or take place for the time range that detects feedback therein.Otherwise it takes a little value.
Can draw the intensity of feedback from the intensity of detected system's change (for example change of resonance frequency).Step pitch control can be reflected in this intensity on the step pitch according to a function that will define.
Fig. 2 represents a specific embodiment of hearing-aid device of the present invention.This hearing-aid device can be expressed as digital system 10 once more.The microphone 11 of this digital system 10 receives a useful signal and the feedback signal from the receiver 12 of digital system 10.11 feedback is undertaken by the physical feedback path 13 that exists the environment of this digital system from receiver 12 to microphone.
The microphone output signal is directed to a processing unit 14 in the inside of digital system 10.The output signal of processing unit 14 is continued to handle in a plurality of system modules that be arranged in parallel 151,152,15N.Their output signal is selected as the receiver signal to receiver 12 transmission in the alternate cells 16 gradually at one once more.Can take place to replace gradually during from a system module output signal, make two system module output signals manifest with a ratio that self changes in short-term to another conversion.
The receiver signal feeds back to the microphone output signal by an adaptive equalization filter 17, and deducts from the microphone output signal in adder 18 at this.The difference signal that produces is supplied with processing unit 14 as input signal on the one hand, is intercepted by oscillating detector 19 at analysis site A on the other hand.Oscillating detector 19 controls replace device 16 gradually.In addition, the signal of analysis site A is by 20 interceptings of a modification detector, the self adaptation step pitch of its control compensation filter 17.
System module 151,152,15N describe the different module that can selectively be inserted in this system.Each system module is represented the additional components of separating of whole system or the part of signal processing.For example, each system module also can be the part of processing unit 14.
Each module 151,152,15N itself define a definite system features.Yet, in the time of in another module access signal processing that is in the system, do not produce any change of hearing of system action.
System module from current access when detecting vibration by oscillating detector 19 replaces or conversion gradually to the next one.If there is feedback singing, then it changes in a kind of mode consistent with the system change frequency and/or amplitude and/or phse conversion after at system module.This change of resonance behavior is determined by revising detector 20, and is introduced a corresponding feedback compensation.
Replace using a plurality of system modules, also can be used as to replace and use the single system module that its feature is controlled with fixed character.Then, in this module, for example carry out gradually and replace by changing parameter.
Analysis site A needn't force to be positioned at the position shown in the example of Fig. 2.On the contrary, any points in the digital system 10 all can be used for gathering the change of the resonance behavior of whole system.
The concrete time series of representing two kinds of detection case below, at this, system is made up of N=2 the module with out of phase feature.Have a sinusoidal signal corresponding to first kind of situation in input, this system is stable, singing do not occur feeding back.The following then reaction of this system:
1. oscillating detector 19 startings.
2. replace gradually to system module 2 from system module 1.
3. revise the frequency shift of detector 20 identifications less than vibration.
4. result: do not detect feedback.
5. replace gradually to system module 1 is reverse once more.(as an alternative, system also can work on system module 2.When oscillating detector 19 is reset one " inquiry ", that is the singing of conjecture feedback, can take back system module 1 from system module 2.This transition does not cause changing under change that yet causes frequency of oscillation under the situation of feedback singing once more or the situation at the input signal of rule yet).
According to second detection case, in input, there is not any sinusoidal signal, feedback singing appears in this system's instability.So following reaction of this system:
1. oscillating detector 19 startings.
2. replace gradually to system module 2 from system module 1.
3. revise detector 20 and recognize the frequency of oscillation change.
4. result: harmonic signal is unsettled result, therefore has feedback.
As above-mentioned situation system can work on system module 2, only reversely when needed replace gradually, perhaps also can reversely once more immediately behind handshake replace gradually.
In order also to comprise this situation, promptly for example produce in system as useful signal and this vibration has been identified the back as " non-feedback singing " and feedback singing occurs a sinusoidal signal, as long as oscillating detector 19 startings, the system module conversion can repeat after certain time interval.
In other embodiments, oscillating detector 19 only detects whether there is vibration, and the nonrecognition frequency of oscillation.Modified module 20 must not change at the resultant signal analytic signal after the next one replaces gradually from a system module in this case.
According to a kind of execution mode of replacement, oscillating detector 19 is also determined one or more frequency of oscillation, and its notice is revised detector 20.The latter is ad hoc analyzing this (these) frequency from a system module then when the next one replaces gradually.Can expect the firmer behavior of system thus.
Claims (14)
1. hearing-aid device has:
-signal input apparatus (11),
-signal output apparatus (12),
-between signal input apparatus and signal output apparatus revisable signal processing apparatus (14,151,152,15N, 16) and
-feedback path (13) from signal output apparatus (11) to signal input apparatus (12), a corresponding resonance behavior that produces this hearing-aid device according to the setting of signal processing apparatus by this feedback path (13),
It is characterized in that,
-analytical equipment (20) is used for analyzing the resonance behavior according to the modification of signal processing apparatus (14,151,152,15N, 16), and the feedback size that is used for determining from analysis result the degree of expression feedback.
2. according to the hearing-aid device of claim 1, wherein, input signal, output signal and feedback signal are acoustic propertys.
3. according to the hearing-aid device of claim 1 or 2, wherein, input signal, output signal and feedback signal are electromagnetic properties.
4. according to the hearing-aid device of one of aforesaid right requirement, wherein, the parameter of described signal processing apparatus (14,151,152,15N, 16) is automatically revised all the time.
5. the hearing-aid device that one of requires according to aforesaid right, it has a feedback estimation unit, and the latter starts the modification of described signal processing apparatus (14,151,152,15N, 16) when feedback surpasses the degree of stipulating about quantity and/or quality.
6. according to the hearing-aid device of claim 5, wherein, described feedback estimation unit comprises an oscillating detector (19), can determine the resonance frequency of system with it, and this resonance frequency is analyzed by described analytical equipment (20) targetedly.
7. according to the hearing-aid device of one of aforesaid right requirement, wherein, described signal processing apparatus (14,151,152,15N, 16) allows the phase modification of signal that will be processed, running time to revise and/or amplitude modification.
8. according to the hearing-aid device of one of aforesaid right requirement, wherein, described signal processing apparatus (14,151,152,15N, 16) can be changed between at least two states or replace gradually continuously.
9. according to the hearing-aid device of one of aforesaid right requirement, have a feedback compensation filter (17), its self adaptation step pitch depends on the feedback size of described analytical equipment (20).
10. method that is used for detecting the feedback of hearing-aid device, its signal processing is set with feedback and is determined the resonance behavior, by:
The signal processing of-modification hearing-aid device,
-analyze the resonance behavior according to the modification of signal processing, and
-feedback the size of definite expression feedback degree from analysis result.
11. according to the method for claim 10, wherein, Cai the parameter of described signal processing only is modified in order to analyze the resonance behavior when feedback surpasses predetermined degree about quantity and/or quality.
12. according to the method for claim 10 or 11, wherein, determine a resonance frequency, it is then targetedly according to modification and feedback and analyzed.
13. according to the method for one of claim 10 to 12, wherein, by the conversion of signal processing between at least two states or the continuous modification that hockets gradually.
14. according to the method for one of claim 10 to 13, wherein, the sef-adapting filter (17) that uses its adaptive speed to depend on feedback is carried out feedback compensation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006023723.4 | 2006-05-19 | ||
| DE200610023723 DE102006023723A1 (en) | 2006-05-19 | 2006-05-19 | Hearing device with feedback detection and corresponding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101076204A true CN101076204A (en) | 2007-11-21 |
Family
ID=38515368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200710109756XA Pending CN101076204A (en) | 2006-05-19 | 2007-05-21 | Hearing aid equipment with feedback detection and corresponding method |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1858289A1 (en) |
| CN (1) | CN101076204A (en) |
| AU (1) | AU2007202232B2 (en) |
| DE (1) | DE102006023723A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102422654A (en) * | 2009-05-11 | 2012-04-18 | 奥迪康有限公司 | Bone anchored hearing aid with adjustable resonance damping |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008036803B3 (en) * | 2008-08-07 | 2009-12-17 | Siemens Medical Instruments Pte. Ltd. | Arrangement and method for controlling a feedback suppression in hearing devices |
| US8144909B2 (en) * | 2008-08-12 | 2012-03-27 | Cochlear Limited | Customization of bone conduction hearing devices |
| DE102009012162A1 (en) * | 2009-03-06 | 2010-09-09 | Siemens Medical Instruments Pte. Ltd. | Method for operating a hearing device and hearing device with a feedback suppression |
| DE102009016845B3 (en) * | 2009-04-08 | 2010-08-05 | Siemens Medical Instruments Pte. Ltd. | Arrangement and method for detecting feedback in hearing devices |
| AT522625B1 (en) * | 2019-06-14 | 2022-05-15 | Avl List Gmbh | Procedure for security screening of a technical unit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19904538C1 (en) * | 1999-02-04 | 2000-07-13 | Siemens Audiologische Technik | Method of detecting feedback in hearing aid |
| EP1191814B2 (en) | 2000-09-25 | 2015-07-29 | Widex A/S | A multiband hearing aid with multiband adaptive filters for acoustic feedback suppression. |
| DE10244184B3 (en) * | 2002-09-23 | 2004-04-15 | Siemens Audiologische Technik Gmbh | Feedback compensation for hearing aids with system distance estimation |
| US20060093173A1 (en) * | 2004-10-14 | 2006-05-04 | Volkmar Hamacher | Method and signal processor for reducing feedback in an audio system |
| DE102004050304B3 (en) * | 2004-10-14 | 2006-06-14 | Siemens Audiologische Technik Gmbh | Method for reducing feedback in an acoustic system and signal processing device |
-
2006
- 2006-05-19 DE DE200610023723 patent/DE102006023723A1/en not_active Ceased
-
2007
- 2007-04-19 EP EP07106508A patent/EP1858289A1/en not_active Ceased
- 2007-05-18 AU AU2007202232A patent/AU2007202232B2/en not_active Ceased
- 2007-05-21 CN CNA200710109756XA patent/CN101076204A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102422654A (en) * | 2009-05-11 | 2012-04-18 | 奥迪康有限公司 | Bone anchored hearing aid with adjustable resonance damping |
| CN102422654B (en) * | 2009-05-11 | 2014-08-13 | 奥迪康医疗有限公司 | Bone anchored hearing aid with adjustable resonance damping |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2007202232A1 (en) | 2007-12-06 |
| AU2007202232B2 (en) | 2009-11-05 |
| DE102006023723A1 (en) | 2007-11-22 |
| EP1858289A1 (en) | 2007-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101076204A (en) | Hearing aid equipment with feedback detection and corresponding method | |
| US8045721B2 (en) | Dynamic distortion elimination for output audio | |
| AU2020202682B2 (en) | Extracting and enhancing a watermark signal from an output signal of a watermarking encoder | |
| US20060159282A1 (en) | Method for suppressing electroacoustic feedback | |
| DK1718110T3 (en) | Audio feedback and suppression means | |
| US6434247B1 (en) | Feedback cancellation apparatus and methods utilizing adaptive reference filter mechanisms | |
| US20110249847A1 (en) | Methods and apparatus for early audio feedback cancellation for hearing assistance devices | |
| WO2018047643A1 (en) | Device and method for sound source separation, and program | |
| CN1877517A (en) | Audio data processing apparatus and method to reduce wind noise | |
| CN103037289A (en) | Control of a loudspeaker output | |
| CN102104821B (en) | Shotgun microphone is utilized to carry out method and the hearing aids of feedback identifying and suppression | |
| CN1612640A (en) | Adaptive feedback canceller | |
| EP1848110A3 (en) | Audio output device and method for calculating parameters | |
| EP3236677B1 (en) | Tonality-driven feedback canceler adaptation | |
| CN1774144A (en) | Method and device for reducing the feedback in acoustic systems | |
| US8259974B2 (en) | Configuration and method for detecting feedback in hearing devices | |
| JP2004289820A (en) | Method and instrument for evaluating performance of optical system | |
| US8280088B2 (en) | Hearing apparatus with feedback detection and corresponding method | |
| CN112866873B (en) | Method for suppressing howling, training method and device of related model, and medium | |
| CN108305635B (en) | Method for distorting the frequency of an audio signal | |
| JP2005257805A (en) | Periodic noise suppression method, periodic noise suppressor, and periodic noise suppression program | |
| WO2009138754A1 (en) | Anti-feedback device | |
| CN117354676B (en) | Sound superposition amplifying method based on long distance | |
| DE102010007336A1 (en) | Method for compensating a feedback signal and hearing device | |
| CN110247723B (en) | Device and method for noise identification and parameter adjustment in PTP (precision time protocol) clock network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20071121 |