CN113920774A - Pulse burst passing method, device and equipment for vehicle detector - Google Patents
Pulse burst passing method, device and equipment for vehicle detector Download PDFInfo
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- CN113920774A CN113920774A CN202111166688.7A CN202111166688A CN113920774A CN 113920774 A CN113920774 A CN 113920774A CN 202111166688 A CN202111166688 A CN 202111166688A CN 113920774 A CN113920774 A CN 113920774A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/14—Traffic control systems for road vehicles indicating individual free spaces in parking areas
- G08G1/149—Traffic control systems for road vehicles indicating individual free spaces in parking areas coupled to means for restricting the access to the parking space, e.g. authorization, access barriers, indicative lights
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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Abstract
The invention discloses a method, a device and equipment for pulse burst passing of a vehicle detector and a computer readable storage medium, wherein the method comprises the steps of receiving an oscillating circuit signal; determining an oscillation frequency from the oscillation circuit signal; judging whether the oscillation frequency exceeds a first threshold value; ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold. According to the invention, by setting the first threshold value, the characteristic that the duration time of the unnatural rising of the oscillation frequency caused by the electric pulse group is short and the oscillation frequency is far greater than the oscillation frequency when the normal vehicle enters the preset area is utilized, the unnatural rising of the oscillation frequency caused by the electric pulse group is ignored, the effect of resisting the interference of the electric pulse group is realized, the detection accuracy of the vehicle detector is improved, and meanwhile, the electric pulse group is filtered out without a hardware filter circuit, so that the production cost is greatly reduced.
Description
Technical Field
The present invention relates to the field of vehicle detection, and in particular, to a method, an apparatus, a device and a computer readable storage medium for passing a pulse burst by a vehicle detector.
Background
With the development of the parking lot industry, cost reduction becomes more important on the premise of not affecting quality. The vehicle detector is an essential part of each parking lot system as one of important parts of the parking lot system, and therefore cost control regarding the vehicle detector is also an important part of the industry.
The main problem of hindering the cost reduction of the vehicle detector is anti-interference, because the vehicle detector determines whether vehicles exist in the preset area at the moment through the frequency change of the oscillating circuit, and the power supply (generally mains supply) can generate an electric pulse group at times, and the electric pulse group can influence the frequency of the oscillating circuit to enable the oscillating frequency to be transient, the vehicles exist in the preset area can be misjudged, and the judgment accuracy of the vehicle detector is reduced
Currently, most of the vehicle detector filtered electric pulse groups on the market adopt hardware filtering, and the cost is quite high in the case of the large volume of the vehicle detector. Therefore, how to reduce the cost on the premise of eliminating the interference of the electric pulse group to the vehicle detector is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a vehicle detector pulse burst passing method, a device, equipment and a computer readable storage medium, which aim to solve the problem that the pulse burst passing method in the prior art interferes with vehicle detection.
To solve the above technical problem, the present invention provides a pulse burst passing method for a vehicle detector, comprising:
receiving an oscillating circuit signal;
determining an oscillation frequency from the oscillation circuit signal;
judging whether the oscillation frequency exceeds a first threshold value;
ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
Optionally, in the vehicle detector pulse burst passing method, the determining an oscillation frequency according to the oscillation circuit signal includes:
determining the period of the oscillating circuit signal by a rising edge interruption method;
the oscillation frequency is determined by the period of the oscillating circuit signal.
Optionally, in the vehicle detector pulse burst passing method, after determining the oscillation frequency, the method further includes:
judging whether the oscillation frequency is lower than a second threshold value;
ignoring the oscillating circuit signal when the oscillating frequency is below the second threshold.
Optionally, in the method for detecting a pulse train passing by a vehicle detector, when the oscillation frequency corresponding to a plurality of consecutive oscillation circuit signals exceeds the first threshold, the method further includes:
and sending an abnormal alarm to a preset terminal.
A vehicle detector pulseburst apparatus, comprising:
the receiving module is used for receiving the oscillating circuit signal;
the frequency module is used for determining the oscillation frequency according to the oscillation circuit signal;
the judging module is used for judging whether the oscillation frequency exceeds a first threshold value;
a filtering module configured to ignore the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
Optionally, in the vehicle detector pulse burst passing apparatus, the frequency module includes:
a rising edge interrupt unit for determining a period of the oscillation circuit signal by a rising edge interrupt method;
and the periodic frequency unit is used for determining the oscillation frequency through the period of the oscillation circuit signal.
Optionally, in the pulse burst passing device of the vehicle detector, the determining module further includes:
a low value judgment unit for judging whether the oscillation frequency is lower than a second threshold value;
a low value filtering unit for ignoring the oscillating circuit signal when the oscillating frequency is lower than the second threshold.
Optionally, the vehicle detector pulse burst passing device further comprises an abnormality warning module;
and the abnormal alarm module is used for sending an abnormal alarm to a preset terminal when the oscillation frequency corresponding to the continuous oscillation circuit signals exceeds the first threshold value.
A vehicle detector pulseburst apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the vehicle detector pulse train passing method as described in any one of the above when the computer program is executed.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the vehicle detector pulse-train passing method as claimed in any one of the above.
The pulse group passing method of the vehicle detector provided by the invention comprises the steps of receiving an oscillating circuit signal; determining an oscillation frequency from the oscillation circuit signal; judging whether the oscillation frequency exceeds a first threshold value; ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold. According to the invention, by setting the first threshold value, the characteristic that the duration time of the unnatural rising of the oscillation frequency caused by the electric pulse group is short and the oscillation frequency is far greater than the oscillation frequency when the normal vehicle enters the preset area is utilized, the unnatural rising of the oscillation frequency caused by the electric pulse group is ignored, the effect of resisting the interference of the electric pulse group is realized, the detection accuracy of the vehicle detector is improved, and meanwhile, the electric pulse group is filtered out without a hardware filter circuit, so that the production cost is greatly reduced. The invention also provides a vehicle detector pulse burst passing device, equipment and a computer readable storage medium with the beneficial effects.
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In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a vehicle detector pulse burst passing method according to the present invention;
FIG. 2 is a schematic flow chart diagram illustrating another embodiment of a vehicle detector pulse burst passing method according to the present invention;
FIG. 3 is a schematic flow chart diagram illustrating another embodiment of a vehicle detector pulse burst passing method according to the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a vehicle detector pulse burst passing device according to the present invention.
Detailed Description
The current principle of the vehicle detector is that the vehicle detector supplies power through 220V commercial power, then supplies power to a main chip, an oscillating circuit and an output control circuit through a rectifier bridge after transforming the voltage through a transformer. The oscillating circuit detects a reference frequency when no vehicle exists, then a threshold value of a vehicle door is set, when the acquired frequency is increased and exceeds the threshold value of the vehicle door, the vehicle is considered to exist, and the vehicle does not exist when the acquired frequency is lower than the threshold value.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the present invention is to provide a method for passing a pulse burst by a vehicle detector, wherein a flow diagram of an embodiment of the method is shown in fig. 1, which is called as a first embodiment, and the method comprises the following steps:
s101: an oscillating circuit signal is received.
The oscillating circuit signal is the electric signal of the oscillating circuit in the foregoing.
S102: an oscillation frequency is determined from the oscillation circuit signal.
The method for determining the oscillation frequency includes a rising edge interrupt method, a falling edge interrupt method, and the like, and the present application is not limited thereto.
S103: and judging whether the oscillation frequency exceeds a first threshold value.
And judging whether the oscillation circuit signal corresponding to the oscillation frequency is a signal influenced by the electric pulse group or not according to the first threshold.
S104: ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
As can be seen from the foregoing, the vehicle detector also determines whether there is a vehicle in the preset area through the increase of the oscillation frequency, and therefore, the first threshold value should be greater than the threshold value, otherwise, it is impossible to detect whether there is a vehicle.
If the oscillation frequency does not exceed the first threshold value all the time, the vehicle detector works normally all the time, and because the reference frequency of the oscillation circuit changes in a normal range along with the fluctuation of the mains supply, the oscillation circuit signal is acquired once every fixed time, and the reference frequency is updated according to the oscillation frequency at the moment.
In the process, if the difference value of the oscillation frequencies of the oscillation circuit signals acquired twice in the adjacent process is within a preset range (the acquisition interval of the oscillation circuit signals is usually in millisecond level), the frequency change at the moment is considered to be normal change caused by commercial power, and the reference frequency is normally updated; if the difference value of the oscillation frequencies of the oscillation circuit signals obtained in two adjacent times is out of the preset range, it is indicated that a vehicle enters a corresponding preset area at the moment, the updating of the reference frequency is suspended, the oscillation circuit signals are continuously obtained until the oscillation frequency is stable, whether the stable oscillation frequency is located between the limit value of the vehicle door and the first threshold value is judged, if yes, the vehicle is judged, and the reference frequency is updated according to the last oscillation frequency before the oscillation frequency starts to rise, or the reference frequency is directly updated according to the oscillation frequency before the preset time (usually, before several seconds).
Furthermore, when the oscillation frequency corresponding to a plurality of consecutive oscillation circuit signals exceeds the first threshold, the method further includes:
and sending an abnormal alarm to a preset terminal.
Usually, the electric pulse groups do not occur continuously in a short time (usually 200ms to 300ms), the duration of a single electric pulse group is relatively short (for example, 5ms to 20ms), and the interval of receiving the oscillating circuit signal by the vehicle detector is also short, so that the system does not have the condition that the oscillating frequency corresponding to a plurality of continuous oscillating circuit signals exceeds the first threshold value under normal conditions, and if the oscillating frequency exceeds the first threshold value, the system circuit is in failure with a high probability, and an alarm should be issued in time.
The preset terminal may be an audible and visual alarm, or a mobile terminal carried by a worker, and the invention is not limited herein.
The pulse group passing method of the vehicle detector provided by the invention comprises the steps of receiving an oscillating circuit signal; determining an oscillation frequency from the oscillation circuit signal; judging whether the oscillation frequency exceeds a first threshold value; ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold. According to the invention, by setting the first threshold value, the characteristic that the duration time of the unnatural rising of the oscillation frequency caused by the electric pulse group is short and the oscillation frequency is far greater than the oscillation frequency when the normal vehicle enters the preset area is utilized, the unnatural rising of the oscillation frequency caused by the electric pulse group is ignored, the effect of resisting the interference of the electric pulse group is realized, the detection accuracy of the vehicle detector is improved, and meanwhile, the electric pulse group is filtered out without a hardware filter circuit, so that the production cost is greatly reduced.
On the basis of the first specific embodiment, a method for determining the oscillation frequency is further defined to obtain a second specific embodiment, a flow chart of which is shown in fig. 2, and includes:
s201: an oscillating circuit signal is received.
S202: the period of the oscillating circuit signal is determined by a rising edge interrupt method.
S203: the oscillation frequency is determined by the period of the oscillating circuit signal.
The rising edge interruption method is to record the length, i.e. the period, of each waveform (between two rising edges), and convert the length by taking the reciprocal of the period to obtain the oscillation frequency.
S204: and judging whether the oscillation frequency exceeds a first threshold value.
S205: ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
The specific implementation mode specifically provides a method for determining the oscillation frequency, namely a rising edge interruption method is used, the method is simple in steps, high in accuracy, not prone to being interfered by the outside, more importantly, low in occupied computing power and high in response speed, the reaction speed of the method can be greatly improved, and the computing efficiency is improved. Of course, other methods for determining the frequency may be selected according to actual situations, and the present invention is not limited herein.
On the basis of the second specific embodiment, a method for determining the oscillation frequency is further defined to obtain a third specific embodiment, a flow chart of which is shown in fig. 2, and includes:
s301: an oscillating circuit signal is received.
S302: the period of the oscillating circuit signal is determined by a rising edge interrupt method.
S303: the oscillation frequency is determined by the period of the oscillating circuit signal.
S304: and judging whether the oscillation frequency exceeds a first threshold value.
S305: ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
S306: and judging whether the oscillation frequency is lower than a second threshold value.
S307: ignoring the oscillating circuit signal when the oscillating frequency is below the second threshold.
It should be noted that there is no strict precedence relationship between the determination process formed in steps S304 and S305 and the determination process formed in steps S306 and S307, and the positions of the two processes can be changed freely without affecting the final determination result.
In the present embodiment, in addition to the high-frequency pulse (generally above 100 kHz) that increases the oscillation frequency of the oscillation circuit, there is also a low-frequency pulse (generally below 5 kHz) that decreases the oscillation frequency, and in addition to the case of determining that the oscillation frequency is higher than the first threshold value due to the high-frequency pulse, the case of determining that the oscillation frequency is lower than the second threshold value due to the low-frequency pulse is also checked, and if the oscillation frequency is ignored to decrease due to the electric pulse group, it is possible that a vehicle is not present in the corresponding area, and the intercepting bar falls down in advance, causing injury to people or damage to the vehicle, in other words, the present embodiment further reduces the possibility of malfunction of the vehicle detector, and improves the detection accuracy and precision.
In the following, the vehicle detector-passing burst device provided by the embodiment of the present invention is described, and the vehicle detector-passing burst device described below and the vehicle detector-passing burst method described above may be referred to in correspondence.
Fig. 4 is a block diagram of a vehicle detector pulse-train passing apparatus according to an embodiment of the present invention, and the vehicle detector pulse-train passing apparatus according to fig. 4 may include:
a receiving module 100, configured to receive an oscillating circuit signal;
a frequency module 200 for determining an oscillation frequency from the oscillation circuit signal;
a determining module 300, configured to determine whether the oscillation frequency exceeds a first threshold;
a filtering module 400 configured to ignore the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
As a preferred embodiment, the frequency module 200 includes:
a rising edge interrupt unit for determining a period of the oscillation circuit signal by a rising edge interrupt method;
and the periodic frequency unit is used for determining the oscillation frequency through the period of the oscillation circuit signal.
As a preferred implementation manner, the determining module 300 further includes:
a low value judgment unit for judging whether the oscillation frequency is lower than a second threshold value;
a low value filtering unit for ignoring the oscillating circuit signal when the oscillating frequency is lower than the second threshold.
As a preferred embodiment, the system further comprises an abnormality alarm module;
and the abnormal alarm module is used for sending an abnormal alarm to a preset terminal when the oscillation frequency corresponding to the continuous oscillation circuit signals exceeds the first threshold value.
The vehicle detector pulse burst passing apparatus of this embodiment is used to implement the vehicle detector pulse burst passing method, and therefore specific embodiments of the vehicle detector pulse burst passing apparatus may be found in the foregoing example portions of the vehicle detector pulse burst passing method, for example, the receiving module 100, the frequency module 200, the determining module 300, and the filtering module 400 are respectively used to implement steps S101, S102, S103, and S104 in the vehicle detector pulse burst passing method, so that the specific embodiments thereof may refer to descriptions of corresponding respective partial embodiments, and are not repeated herein.
The pulse group passing device of the vehicle detector provided by the invention is used for receiving an oscillating circuit signal through a receiving module 100; a frequency module 200 for determining an oscillation frequency from the oscillation circuit signal; a determining module 300, configured to determine whether the oscillation frequency exceeds a first threshold; a filtering module 400 configured to ignore the oscillating circuit signal when the oscillating frequency exceeds the first threshold. According to the invention, by setting the first threshold value, the characteristic that the duration time of the unnatural rising of the oscillation frequency caused by the electric pulse group is short and the oscillation frequency is far greater than the oscillation frequency when the normal vehicle enters the preset area is utilized, the unnatural rising of the oscillation frequency caused by the electric pulse group is ignored, the effect of resisting the interference of the electric pulse group is realized, the detection accuracy of the vehicle detector is improved, and meanwhile, the electric pulse group is filtered out without a hardware filter circuit, so that the production cost is greatly reduced.
A vehicle detector pulseburst apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the vehicle detector pulse train passing method as described in any one of the above when the computer program is executed. The pulse group passing method of the vehicle detector provided by the invention comprises the steps of receiving an oscillating circuit signal; determining an oscillation frequency from the oscillation circuit signal; judging whether the oscillation frequency exceeds a first threshold value; ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold. According to the invention, by setting the first threshold value, the characteristic that the duration time of the unnatural rising of the oscillation frequency caused by the electric pulse group is short and the oscillation frequency is far greater than the oscillation frequency when the normal vehicle enters the preset area is utilized, the unnatural rising of the oscillation frequency caused by the electric pulse group is ignored, the effect of resisting the interference of the electric pulse group is realized, the detection accuracy of the vehicle detector is improved, and meanwhile, the electric pulse group is filtered out without a hardware filter circuit, so that the production cost is greatly reduced.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the vehicle detector pulse-train passing method as claimed in any one of the above. The pulse group passing method of the vehicle detector provided by the invention comprises the steps of receiving an oscillating circuit signal; determining an oscillation frequency from the oscillation circuit signal; judging whether the oscillation frequency exceeds a first threshold value; ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold. According to the invention, by setting the first threshold value, the characteristic that the duration time of the unnatural rising of the oscillation frequency caused by the electric pulse group is short and the oscillation frequency is far greater than the oscillation frequency when the normal vehicle enters the preset area is utilized, the unnatural rising of the oscillation frequency caused by the electric pulse group is ignored, the effect of resisting the interference of the electric pulse group is realized, the detection accuracy of the vehicle detector is improved, and meanwhile, the electric pulse group is filtered out without a hardware filter circuit, so that the production cost is greatly reduced.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The present invention provides a method, apparatus, device and computer readable storage medium for detecting vehicle passing pulse group. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A vehicle detector pulse burst passing method, comprising:
receiving an oscillating circuit signal;
determining an oscillation frequency from the oscillation circuit signal;
judging whether the oscillation frequency exceeds a first threshold value;
ignoring the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
2. The vehicle detector pulseburst method of claim 1, wherein said determining an oscillation frequency from the oscillating circuit signal comprises:
determining the period of the oscillating circuit signal by a rising edge interruption method;
the oscillation frequency is determined by the period of the oscillating circuit signal.
3. The vehicle detector pulseburst method of claim 1, further comprising, after determining the oscillation frequency:
judging whether the oscillation frequency is lower than a second threshold value;
ignoring the oscillating circuit signal when the oscillating frequency is below the second threshold.
4. The vehicle detector pulseburst passing method of claim 1, wherein when the oscillation frequency for a consecutive plurality of said oscillating circuit signals exceeds said first threshold, further comprising:
and sending an abnormal alarm to a preset terminal.
5. A vehicle detector pulseburst apparatus, comprising:
the receiving module is used for receiving the oscillating circuit signal;
the frequency module is used for determining the oscillation frequency according to the oscillation circuit signal;
the judging module is used for judging whether the oscillation frequency exceeds a first threshold value;
a filtering module configured to ignore the oscillating circuit signal when the oscillating frequency exceeds the first threshold.
6. The vehicle detector pulseburst device of claim 5, wherein the frequency module comprises:
a rising edge interrupt unit for determining a period of the oscillation circuit signal by a rising edge interrupt method;
and the periodic frequency unit is used for determining the oscillation frequency through the period of the oscillation circuit signal.
7. The vehicle detector pulseburst device of claim 5, wherein the determining module further comprises:
a low value judgment unit for judging whether the oscillation frequency is lower than a second threshold value;
a low value filtering unit for ignoring the oscillating circuit signal when the oscillating frequency is lower than the second threshold.
8. The vehicle detector pulser-crossing according to claim 5, further comprising an anomaly alert module;
and the abnormal alarm module is used for sending an abnormal alarm to a preset terminal when the oscillation frequency corresponding to the continuous oscillation circuit signals exceeds the first threshold value.
9. A vehicle detector pulseburst device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the vehicle detector pulse burst method as claimed in any one of claims 1 to 4 when executing said computer program.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the vehicle detector pulse-train passing method according to any one of claims 1 to 4.
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| CN202111166688.7A CN113920774A (en) | 2021-09-30 | 2021-09-30 | Pulse burst passing method, device and equipment for vehicle detector |
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| CN111740716A (en) * | 2020-07-16 | 2020-10-02 | 江西科技学院 | Device and method for filtering power frequency interference |
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