KR102209553B1 - Method and apparatus for high sensitivity signal sensing - Google Patents

Abstract

Disclosed is a high-sensitivity signal processing method for detecting a fine signal, and a high-sensitivity signal detection device using the same. In the high-sensitivity signal processing apparatus for detecting a fine signal, the high-sensitivity signal processing apparatus for detecting a fine signal according to an embodiment includes: a first sampling frequency that is smaller than a target frequency of a target signal to be detected. 1 sampling unit, a peak value detection unit that detects a peak value having the largest voltage level among values sampled through the first shankling, and a second sampling frequency equal to the target frequency from a target signal sampling time point to the input signal. A second sampling unit that performs a second sampling for the second sampling unit, a signal detection unit that determines whether the input signal corresponds to a detection target signal based on the power level magnitude of the sampling values in the second sampling, and a time when the peak value occurs And a sampling control unit that determines the target signal sampling time point for sampling at the same frequency as the target frequency, and controls the first sampling unit, the second sampling unit, and the signal detection unit.

Description

High-sensitivity signal processing method for fine signal detection, and high-sensitivity signal detection device using the same {METHOD AND APPARATUS FOR HIGH SENSITIVITY SIGNAL SENSING}

The present invention relates to high-sensitivity signal processing for fine signal detection, and to a high-sensitivity signal processing method for fine signal detection and a high-sensitivity signal detection device using the same.

The performance of a system that receives analog signals and performs digital signal processing is often very limited in the speed of converting analog signals to digital, and systems that require high-speed signal sampling technology use a high-speed ADC (Analog to Digital Converter) in real time. Samples of the received data but using a high-speed ADC can increase the cost.

Meanwhile, a method of using a plurality of low-speed ADCs may be considered to prevent an increase in cost due to the use of high-speed ADCs. As the number of ADCs increases, the hardware structure may become complicated.

In addition, in the case of a system that performs digital signal processing according to the prior art, it is generally for processing a radio frequency (RF) signal, and is suitable for detecting a signal of high output power in a specific frequency band, but from an electronic device that does not perform communication. It is not suitable for detecting radiated microscopic signals.

Korean Patent Laid-Open Patent No. 10-2018-0007930, "Phase Control Device for Time Interleaved Sampling ADC" Korean Patent Application Publication No. 10-2014-0127119, "Digital resampling device using partial delay generator" Korean Patent Application Publication No. 10-2011-0092197, "Subsampling-based receiver using frequency selective noise canceller"

Embodiments of the present invention are intended to provide an apparatus and method capable of detecting a fine signal by performing sampling using a target frequency of a detection target signal without the need for a high-speed ADC for signal restoration.

In addition, embodiments of the present invention aim to provide an apparatus and method capable of determining that a specific electronic device exists by detecting a minute signal radiated from an internal circuit of an electronic device, such as a smart phone and a micro camera.

Further, embodiments of the present invention are intended to provide an apparatus and method capable of supporting various operation modes capable of accurately detecting an electronic device including an image sensor or determining a situation in which an image sensor is suspected to exist.

A high-sensitivity signal processing apparatus for detecting a fine signal according to an embodiment includes a first sampling unit for performing a first sampling at a first sampling frequency smaller than a target frequency of a detection target signal, and the first sampling unit. A peak value detection unit that detects a peak value having the largest voltage level among values sampled through and a second sampling unit that performs a second sampling on the input signal at a second sampling frequency equal to the target frequency from a target signal sampling point And, a signal detector for determining whether the input signal corresponds to a detection target signal based on the magnitude of the power level of the sampling values in the second sampling, and for sampling at the same frequency as the target frequency based on the time when the peak value occurs. And a sampling control unit that determines the target signal sampling time point and controls the first sampling unit, the second sampling unit, and the signal detection unit.

The sampling control unit includes a mode for detecting a vertical clock frequency of an image sensor provided in a device that generates a detection target signal as a target frequency and a vertical clock frequency and a horizontal clock frequency of the image sensor. Among modes for detecting all two or more clock frequencies that may occur in the sensor, a currently selected operation mode may be checked, and the first and second sampling frequencies may be controlled based on the currently selected operation mode.

The sampling control unit controls the first sampling unit to perform the first sampling at a frequency that is 100 Hz smaller than the target frequency when the target frequency is in the kHz band, and when the target frequency is in the MHz band, 1000 Hz is higher than the target frequency. The first sampling unit may be controlled to perform the first sampling at a small frequency.

The peak value detector detects the peak value for each sampling section determined by the following equation,

The sampling control unit may determine a target signal sampling time point based on a time point at which each peak value occurs for each sampling section from a first sampling start time point.

The sampling control unit

Controlling the first sampling unit to perform the first sampling n times (n is an integer greater than or equal to 1), and determining a time point at which the peak value is detected in the n+1th execution of the first sampling as the target signal sampling time point I can.

The high-sensitivity signal processing method for detecting a fine signal according to an embodiment includes performing a first sampling on an input signal at a first sampling frequency smaller than a target frequency of the detection target signal, and among values sampled through the first sampling. Detecting a peak value having the highest voltage level; determining a target signal sampling time for sampling at the same frequency as the target frequency based on the time when the peak value occurs; and the target signal from the target signal sampling time Performing a second sampling on the input signal at a second sampling frequency equal to the frequency, and determining whether the input signal corresponds to a detection target signal based on a power level magnitude of sampling values in the second sampling. do.

According to an embodiment of the present invention, a fine signal can be detected by performing sampling using a target frequency of a detection target signal without the need for a high-speed ADC for signal restoration.

In addition, it can be determined that a specific electronic device exists by detecting a minute signal radiated from an internal circuit of an electronic device such as a smart phone and a micro camera.

In addition, it is possible to support various operation modes capable of accurately detecting an electronic device including an image sensor or determining a situation in which the image sensor is suspected to exist.

1 is a diagram for describing a configuration of a signal sensing device according to an exemplary embodiment.
2 is a diagram illustrating a configuration of a high-sensitivity signal sensing device for detecting a fine signal according to an exemplary embodiment.
3 is a diagram illustrating a configuration of a reception signal processing unit according to an embodiment.
4 to 6 are exemplary diagrams for explaining a signal detection principle of a high-sensitivity signal processing apparatus according to an exemplary embodiment.
7 is a flowchart illustrating a method of processing a high-sensitivity signal according to an exemplary embodiment.
8 is a flowchart illustrating a method of processing a high-sensitivity signal and detecting a signal according to an exemplary embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and contents described in the accompanying drawings, but the present invention is not limited or limited by the embodiments.

The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, actions and/or elements, and/or elements, steps, actions and/or elements mentioned. Or does not exclude additions.

As used herein, "embodiment", "example", "side", "example" and the like should be construed as having any aspect or design described better or advantageous than other aspects or designs. Is not.

In addition, the term'or' means an inclusive OR'inclusive or' rather than an exclusive OR'exclusive or'. That is, unless otherwise stated or clear from the context, the expression'x uses a or b'means any one of natural inclusive permutations.

In addition, the singular expression ("a" or "an") used in this specification and the claims generally means "one or more" unless otherwise stated or unless it is clear from the context that it relates to the singular form. Should be interpreted as.

In addition, terms such as first and second used in the specification and claims may be used to describe various elements, but the elements should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless explicitly defined specifically.

Meanwhile, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms used in the present specification are terms used to properly express an embodiment of the present invention, which may vary depending on the intention of users or operators, or customs in the field to which the present invention belongs. Accordingly, definitions of these terms should be made based on the contents throughout the present specification.

1 is a diagram for describing a configuration of a signal sensing device according to an exemplary embodiment.

Referring to FIG. 1, the signal detection device 100 includes an antenna unit 110, a reception signal processing unit 120, a high-sensitivity signal processing unit 130, a display unit 140, a control unit 150, and a storage unit 160. Include.

The antenna unit 110 may be an antenna for receiving a fine signal generated from an electronic device. For example, the antenna unit 110 may include a ferrite rod type antenna.

The reception signal processing unit 120 may include an analog front end circuit for processing a received signal, an analog signal circuit for generating an intermediate frequency signal, removing noise, and adjusting a signal gain.

In this case, the reception signal processing unit 120 may further include a mixer, and may further include an anti-aliasing filter unit (not shown) for removing aliasing of an intermediate frequency signal.

For example, a signal output from the anti-aliasing filter unit may be referred to as an input signal of the high sensitivity signal processing unit 130.

On the other hand, the signal detection device according to an embodiment of the present invention is for receiving and filtering a frequency component of a 1 to tens of kHz band or a frequency component of a 1 to tens of MHz band radiated from an oscillator built into an image sensor for a video camera. Circuitry.

Accordingly, the signal detection apparatus according to an exemplary embodiment may detect a corresponding frequency band using a high-sensitivity antenna and a frequency selection circuit.

The high-sensitivity signal processing unit 130 detects a fine signal using a sampling method and a signal detection method according to an exemplary embodiment of the present invention to detect a signal using a detection target frequency.

The display unit 140 performs a function of displaying various types of information for controlling the detection result of the signal, the strength of the detected signal, and processing of a high-sensitivity signal.

The controller 150 includes at least one processor and performs a function of controlling the overall operation of the signal sensing device 100.

The storage unit 160 performs a function of storing information input from a user, a signal detection history, and information on a frequency band of a detection target signal.

2 is a diagram illustrating a configuration of a high-sensitivity signal sensing device for detecting a fine signal according to an exemplary embodiment.

Referring to FIG. 2, the apparatus for detecting a high-sensitivity signal according to an embodiment may be applied to the high-sensitivity signal processing unit 130 of FIG. 1.

Referring to FIG. 2, the high-sensitivity signal detection device includes a sampling unit 231, a peak value detection unit 235, a sampling control unit 237, and a signal detection unit 239.

The sampling unit 231 may perform a first sampling or a second sampling according to a sampling clock and a sampling frequency control signal input from the sampling control unit 237.

In addition, the sampling unit 231 may include a first sampling unit 232 performing a first sampling and a second sampling unit 233 performing a second sampling.

The first sampling unit 232 performs first sampling on the input signal at a first sampling frequency smaller than the target frequency of the detection target signal.

The peak value detector 235 detects a peak value having the highest voltage level among values sampled through the first sampling.

In this case, the first sampling may be performed to find a starting point for performing the second sampling at the same sampling frequency as the target frequency. That is, according to an embodiment of the present invention, the exact starting point for performing sampling at the same sampling frequency as the target frequency is found through the first sampling, and through the second sampling, high-speed ADC or sampling is performed even when the power level of the input signal is fine. It is possible to detect a signal to be detected without the need for a sampling rate.

The first sampling frequency may be performed at a frequency finely adjusted than the target frequency. For example, when the target frequency is 15.75KHz, the fine tuning value is 100Hz, and the first sampling frequency is 15.65KHz (=15650Hz).

In this case, the detection target signal may be a clock pulse signal generated from a specific sensor, for example, an image sensor, not a radio frequency (RF) signal for communication purposes.

For example, the image sensor may radiate a frequency component of 15.75KHz from the built-in Horizontal Oscillator, and in this case, the detection target signal is a horizontal clock pulse signal generated from the image sensor, and the target frequency may be 15.75KHz.

In addition, the image sensor may use different clock pulses for each manufacturer and model.

In addition, in the case of an image sensor, a vertical clock pulse may be used, and in this case, the vertical clock pulse may be a frequency component of 15.75KHz or a different frequency.

For example, clock pulses different for each manufacturer and model of an image sensor may be referred to as'clock pulse frequency for each image sensor type'.

The sampling frequency corresponds to a sampling rate, that is, a sampling rate, and when the sampling rate is determined, the number of samples per second is determined.

Therefore, the theoretical number of samples for detecting the peak value through the first sampling is LCM(f1, f2)/2. Here, LCM(f1, f2) means the least common multiple of f1 and f2. For example, when f1 is 157Hz and f2 is 156Hz, LCM(f1, f2) is 24492, and when sampling at 156Hz to detect the peak value of the input signal at 157Hz, 12246 sampling times may be required.

In the embodiment of the present invention, the sampling is not for the purpose of accurately recovering the signal, but for detecting the peak value of the input signal to find the start point of the second sampling. Therefore, the high-speed sampling rate required by a typical ADC is not required. In addition, it is sufficient to find the point at which a value close to the peak value is detected without finding an exact peak value. Therefore, the number of samples required to sample with the first sampling may be set as shown in Equation 1 below.

[Equation 1]

Here, Roundup(A, 0) represents a function that rounds up from the first decimal place of A value to return an integer, LCM(f _s1 , f _t ) is the least common multiple of f _s1 , and f _t , f _t is the target frequency , f _s1 denotes a first sampling frequency. At this time, the units of f _s1 and f _t for calculating the LCM are numbers in Hz, not KHz. For example, if f _s1 and f _t are 15.65 KHz and 15.75 Hz, respectively, the number of samples can be calculated using the least common multiple of 1565 and 1575.

The peak value detector 235 may detect a peak value for each sampling period determined as in Equation 1. For example, when the number of samples determined by Equation 1 is 246538, the peak value may be calculated every 158 seconds when the first sampling is performed at 15.65 KHz.

The second sampling unit 233 performs second sampling on the input signal at a second sampling frequency equal to the target frequency from a target signal sampling time point.

Accordingly, before the peak value is detected by the peak value detector 235, the second sampling unit 233 may be in an inactive state and may be maintained in a standby state without performing any operation.

In the case of a typical analog-to-digital conversion circuit, high-speed sampling is performed twice or more faster than the target frequency for the purpose of restoring a signal, but the high-sensitivity signal detection device according to an embodiment performs first sampling to detect the presence or absence of the corresponding signal. And by performing the second sampling, a high-speed sampling circuit may not be required.

The sampling control unit 237 may provide a sampling clock for the first sampling to the first sampling unit 232, and may provide a sampling clock for performing the second sampling to the second sampling unit 233. In other words, the sampling control unit 237 may control the sampling operation of the first sampling unit 232 and the second sampling unit 233.

The sampling control unit 237 may select one of a clock pulse frequency (CPF) for each image sensor type and determine a first sampling frequency and a first sampling period for the selected CPF.

In this case, the sampling control unit 237 may store and manage the clock pulse frequency for each image sensor type in a lookup table for each manufacturer, for each manufacturing model, and for each clock frequency type.

Depending on the electronic device or the type of the clock frequency, the clock frequency component may or may not be radiated to the outside.

Typically, in the case of a camera device, since an image sensor including an electronic circuit and a lens are provided, it is difficult to completely shield a clock frequency component between the image sensor and the lens.

For example, an image sensor may use a horizontal clock, a vertical clock, a pixel clock, etc., and a horizontal clock and a vertical clock may be radiated to the outside.

Accordingly, the sampling control unit 237 may select the target frequency of the detection target signal as at least one of a horizontal clock and a vertical clock. At this time, the frequency bands of the horizontal clock and vertical clock may vary greatly depending on the manufacturer or model of the image sensor.

If the vertical clock of the image sensor is 10 MHz band (or 10 kHz band) and the horizontal clock is 1 MHz band (or 1 kHz band), the reception signal processor 120 of FIG. 1 uses two different frequency bands to process these signals. It may also include two or more filtering circuits for processing.

Meanwhile, the sampling control unit 237 may select any one of a clock pulse frequency (CPF) for each image sensor type, and control the first sampling unit 232 and the second sampling unit 233.

In this case, information on the timing at which the first peak value occurs (ie, the number of samples) of the first sampling may be provided to the sampling control unit 237 and the signal detection unit 239.

For example, if the target frequency is 15.75 kHz, it is assumed that the first sampling frequency is 15.65 kHz, and 246,538 samples are performed n times at a sampling rate of 15.65 kHz to detect a peak value. In this case, when a peak value is detected in the 200,000th sample, the peak value may be detected near the 200,000th sample even in the n+1th sampling.

Consequently, according to an embodiment of the present invention, the peak value may be detected for each time interval in which the first sampling is performed, and the detection time point of the peak value may have a certain period.

Accordingly, the sampling control unit 237 determines the target signal sampling time point based on the time point at which each peak value occurs for each of the sampling intervals from the first sampling start time point, or the peak value at the n+1th execution of the first sampling period. The detected time point may be determined as a starting point of target signal sampling.

The sampling control unit 237 may determine the first sampling frequency for the CPF selected by Equation 2 below.

[Equation 2]

는 제1 샘플링 주파수,

는 검출 대상 신호의 타겟 주파수,

는 제1 샘플링 구간의 실행 횟수(

)에 따라 결정되는 상수,

는 타겟 주파수의 단위에 따라 결정되는 미세 조정 값을 나타낸다. here,

Is the first sampling frequency,

Is the target frequency of the signal to be detected,

Is the number of executions of the first sampling interval (

Constant determined according to ),

Represents a fine adjustment value determined according to the unit of the target frequency.

는(i=1, 2, 3,…) 제1 샘플링 구간의 실행 횟수에 따라 1보다 큰 상수로 결정될 수 있다. At this time,

(I=1, 2, 3,...) may be determined as a constant greater than 1 according to the number of executions of the first sampling period.

For example, the number of executions of the first sampling period may be 1, and when the power level of the signal received through the antenna unit 110 of FIG. 1 is less than a preset reference value, the number of executions of the first sampling period is less than 1 Can be set to a large value.

At this time, C ₁ , C ₂ , C ₃ may be set to 1, 1.1, and 1.2, for example.

Meanwhile, when the number of times of execution of the first sampling period is plural, the detection and generation time of the peak value through the first sampling may be determined as follows.

For example, a peak value is detected at the 120th sampling point in the first period of the first sampling, the peak value is detected at the 122nd sampling point in the second period, and the peak value is determined at the 123th sampling point in the third period. In this case, when all of the peak values are smaller than a preset reference value (for example, 0.1 mWatt), the first sampling may be further performed.

In this case, if any of the peak values is greater than a preset reference value, it may be determined that the corresponding peak value is detected.

In addition, when all of the peak values are larger than a preset reference value, it may be determined that the peak value is detected at the position where the largest peak value is detected, and when the execution of the first sampling section is repeated 10 or more times. It may be determined that the peak value is detected at the sampling time point where the largest number of peak value occurrence locations are shown.

In addition, when measuring while moving a signal detection device to detect an electronic device that generates a detection target signal in an arbitrary three-dimensional space, when the movement of the signal detection device is greater than or faster than the reference value, the number of executions of the first sampling section is 10. A value greater than and less than 100 can be set.

In addition, when the signal detection device slowly moves to detect an electronic device that generates a detection target signal in an arbitrary three-dimensional space, the motion of the signal detection device may be less than or slower than the reference value, and in this case, the number of executions of the first sampling section May be set to a value of 10 or less.

In this case, the signal sensing device may further include a sensor for measuring a movement speed and acceleration of the device itself.

는 타겟 주파수가 kHz 대역인 경우 0.1로 설정되고, 타겟 주파수가 MHz 대역인 경우 1로 설정될 수 있다. 따라서, 타겟 주파수가 15.75kHz인 경우

[kHz]는 0.1[kHz]일 수 있다. E.g,

May be set to 0.1 when the target frequency is in the kHz band, and may be set to 1 when the target frequency is in the MHz band. Therefore, if the target frequency is 15.75 kHz

[kHz] may be 0.1 [kHz].

The signal detector 239 determines whether the input signal corresponds to the detection target signal based on the magnitude of the power level of the sampling values in the second sampling.

The signal detector 239 may compare the power level magnitude of the sampling values with the peak value in the second sampling, and determine that the input signal is the detection target signal if it is equal to the peak value or is maintained within a preset error range.

The sampling control unit 237 determines a target signal sampling time for sampling at the same frequency as the target frequency based on the time at which the peak value occurs, and the first sampling unit 2332, the second sampling unit 233 and the signal detection unit ( 239).

The sampling control unit 237 includes a mode for detecting a vertical clock frequency of an image sensor provided in a device that generates a detection target signal as a target frequency, and a vertical clock frequency and a horizontal clock frequency of the image sensor. Among modes for detecting all two or more clock frequencies that may occur in the image sensor of, the currently selected operation mode may be checked, and the first sampling frequency and the second sampling frequency may be controlled based on the currently selected operation mode.

Using the high-sensitivity signal detection device shown in FIG. 2, it is possible to detect a modified form of an illegal photographing device. Recently, illegal photographing devices are called "hidden cameras" or "hidden cameras" and are being abused for crime. A detector according to the prior art for detecting such an illegal photographing device uses an infrared laser method and an RF signal detection method.

In the case of the infrared laser method, light is emitted from the laser sensor to identify the lens, and detection is possible in the form of facing the camera lens and the detector built into the illegal photographing device. However, there is a problem that detection is impossible when the camera lens is hidden in the blind spot.

Meanwhile, the RF signal detection method uses a wireless transmission method in the 2.45GHz or 1.2GHz band, and recently, since the frequency band is changed to the 2.1055GHz band, there is a problem that it cannot be detected with a conventional detector.

In addition, since the illegal photographing detector of the RF signal detection method is applied to the case of transmitting the photographed image by the wireless transmission method, there is a problem that the microscopic illegal photographing device with a built-in memory card that does not transmit wirelessly cannot be detected.

However, since the high-sensitivity signal detection apparatus according to an embodiment can detect the clock frequency of the image sensor instead of detecting the RF wireless communication signal, it is possible to detect a microscopic illegal photographing device with a built-in memory card.

3 is a diagram illustrating a configuration of a reception signal processing unit according to an embodiment.

1 to 3, an input signal input to the high-sensitivity signal processing unit 130 may be input through the reception signal processing unit 120.

The reception signal processing unit 321 illustrated in FIG. 3 may be a specific configuration of the reception signal processing unit 120 illustrated in FIG. 1.

The reception signal processing unit 321 includes a first processing unit 323 processing a vertical clock pulse frequency band for each type of image sensor, and a second processing unit 323 processing horizontal clock pulse frequency band for each type of image sensor ( 325).

In this case, the reception signal processing unit 321 may transfer information on the currently processed frequency band to the sampling control unit 237 and the signal detection unit 239.

The signal detection unit 239 may determine whether each of the first input signal input from the first processing unit 323 and the second input signal input from the second processing unit 323 is a detection target signal.

For example, the signal detection unit 239 may determine that the detection target signal has been detected when both the vertical and horizontal clock frequencies of the image sensor are satisfied, and at least one of the vertical and horizontal clock frequencies of the image sensor When one frequency component is detected, it may be determined that a signal to be detected has been detected.

4 to 6 are exemplary diagrams for explaining a signal detection principle of a high-sensitivity signal processing apparatus according to an exemplary embodiment.

이고, 제1 샘플링 주파수 f_s1는 f_t 보다 미세 조정 값

만큼 느리기 때문에 제1 샘플링의 샘플링 주기는

이다. 4, the frequency of the input signal 410 is assumed to be a detection target signal as f _t . Therefore, the period of the input signal 410 is

And the first sampling frequency f _s1 is a finer adjustment value than f _t

Is slow, so the sampling period of the first sampling is

to be.

second 마다 샘플 값을 획득하고, 피크 값은 참조 부호 401, 403, 405의 시점에서 획득된 전력 레벨 값들 중 403에서 검출 될 수 있다. Therefore, every

A sample value is acquired every second, and the peak value may be detected at 403 among power level values acquired at points 401, 403, and 405.

만큼 빠르게 설정한 경우를 나타낸다. 이때, 제1 샘플링 주파수 f_s1를 f_t 보다 미세 조정 값

만큼 빠르게 설정한 경우 매

second 마다 샘플 값을 획득할 수 있다. On the other hand, Figure 5 shows the first sampling frequency f _s1 finely adjusted than f _t

It indicates the case of setting as fast as possible. At this time, the first sampling frequency f _s1 is a fine adjustment value than f _t

If set as fast as

Sample values can be obtained every second.

In the example illustrated in FIG. 5, the peak value may be determined as any one of power level values obtained at the time points 501, 503, and 505.

6 is a diagram for describing an example of performing a second sampling in the example shown in FIG. 4.

Referring to FIG. 6, the n-th first sampling may proceed from a measurement start point to a time point 610. In this case, the peak value detector 235 of FIG. 2 may determine a value measured in the sampling performed at the time point 403 as the peak value.

At this time, the sampling control unit 237 no longer performs the first sampling, and after the end of the n-th first sampling, the sampling control unit 237 performs the second sampling from the time point 603 past the time point 610 from the measurement start point. 2 The sampling unit 233 can be controlled.

In addition, the n+1st first sampling is performed once more up to the point 620, but if the power level measured at 403 and the value within a certain range are measured near the point 603, the second sampling is performed from that point. The second sampling unit 233 may be controlled.

When the peak value is found through the first sampling, the second sampling is performed at the same rate as the target frequency of the detection target signal, so as shown in reference numeral 605, the power level equal to the peak value or within a certain range is continuously measured. I can.

In this way, by using the first sampling frequency that is different from the target frequency of the detection target signal by the fine adjustment value, and using the time when the peak value is detected, the detection target signal can be detected without high-speed sampling. .

As the peak value found through the first sampling has less error than the peak value of the input signal, the sensitivity of signal detection increases.

7 is a flowchart illustrating a method of processing a high-sensitivity signal according to an exemplary embodiment.

The method shown in FIG. 7 may be performed by the high-sensitivity signal sensing device of FIG. 2.

In step 710, the apparatus samples the input signal at a first sampling frequency that is different from the target frequency of the detection target signal by a fine adjustment value.

That is, it is possible to use a sampling frequency that is larger than the target frequency by a fine adjustment value as the first sampling frequency as described in FIG. 5.

In step 720, the device detects a peak value having the largest voltage level among values sampled through the first sampling.

In step 730, the device determines a target signal sampling time for sampling at the same frequency as the target frequency based on the time when the peak value occurs, and the input signal at a second sampling frequency equal to the target frequency from the target signal sampling time. A second sampling is performed on.

In step 740, the apparatus determines whether the input signal corresponds to the detection target signal based on the magnitude of the power level of the sampling values in the second sampling.

8 is a flowchart illustrating a method of processing a high sensitivity signal and detecting a signal according to an exemplary embodiment.

The method illustrated in FIG. 8 may be performed by a high-sensitivity signal sensing device including the reception signal processing unit 321 illustrated in FIG. 3.

In step 810, the device checks the currently selected operation mode.

In this case, the operation mode is, for example, a first mode in which the vertical clock frequency of the image sensor is detected as a target frequency, and two or more clocks that can occur in one image sensor including the horizontal clock frequency as well as the vertical clock frequency of the image sensor. It may include a second mode and a third mode for detecting all frequencies.

In step 820, the device determines whether the selected operation mode is the first mode.

When the selected mode is the first mode, in step 830, the device may set the first processing unit 323 to perform an operation, and deactivate the second processing unit 325 so that it does not operate.

In step 840, the device may determine whether to detect a detection target signal by performing steps 710 to 740 of FIG. 7.

Meanwhile, when the selected mode is the second mode or the third mode, in step 650, the device may set both the first processing unit 323 and the second processing unit 325 to perform an operation.

In step 860, the device inputs the output signal of the first processing unit 323 as an input signal of the high-sensitivity signal processing unit 130, and performs steps 710 to 740 of FIG. 7 on the output signal of the first processing unit 323. I can. In this case, the first processing unit 323 may perform an operation of processing a vertical clock pulse frequency band for each type of image sensor.

In step 870, the device inputs the output signal of the second processing unit 325 as the input signal of the high-sensitivity signal processing unit 130, and performs steps 710 to 740 of FIG. 7 on the output signal of the second processing unit 325. I can.

In step 880, the device may determine whether to detect a detection target signal according to whether the currently selected mode is the second mode or the third mode.

In this case, the low specification signal detection device may support only the first mode, and the high specification signal detection device may support both the second mode and the third mode.

The determination of the first to third modes may be selected by the user, and the control unit ( 150).

For example, the second mode may be a mode in which a detection target signal is determined when both the horizontal clock frequency component and the vertical clock frequency component of the image sensor are detected.

For example, the third mode may be a mode in which a detection target signal is determined when at least one of a horizontal clock frequency component and a vertical clock frequency component of the image sensor is detected. Accordingly, when operating in the second mode, the determination of the existence of the electronic device that generates the detection target signal may be more accurate than that in the third mode.

The apparatus described above may be implemented as a hardware component, a software component, and/or a combination of a hardware component and a software component. For example, the devices and components described in the embodiments include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), It can be implemented using one or more general purpose computers or special purpose computers, such as a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications executed on the operating system. In addition, the processing device may access, store, manipulate, process, and generate data in response to the execution of software. For the convenience of understanding, although it is sometimes described that one processing device is used, one of ordinary skill in the art, the processing device is a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of these, configuring the processing unit to behave as desired or processed independently or collectively. You can command the device. Software and/or data may be interpreted by a processing device or to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodyed in a transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those produced by a compiler but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the embodiment, and vice versa.

As described above, although the embodiments have been described by the limited embodiments and the drawings, various modifications and variations are possible from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and claims and equivalents fall within the scope of the claims to be described later.

Claims (6)

A first sampling unit that performs first sampling on the input signal at a first sampling frequency that is smaller than the target frequency of the detection target signal;
A peak value detector configured to detect a peak value having the largest voltage level among values sampled through the first sampling;
A second sampling unit performing second sampling on the input signal at a second sampling frequency equal to the target frequency from a target signal sampling point;
A signal detector for determining whether the input signal corresponds to a detection target signal based on a power level of sampling values in the second sampling; And
And a sampling control unit determining the target signal sampling time point for sampling at the same frequency as the target frequency based on the time point at which the peak value occurs, and controlling the first sampling unit, the second sampling unit, and the signal detection unit. doing
Signal detection device using high-sensitivity signal processing. The method of claim 1,
The sampling control unit
It can occur in one image sensor, including a mode that detects the vertical clock frequency of the image sensor provided in the device generating the detection target signal as the target frequency, and the vertical and horizontal clock frequencies of the image sensor. Check the currently selected operation mode among modes that detects all two or more clock frequencies,
Controlling the first sampling frequency and the second sampling frequency based on the currently selected operation mode
Signal detection device using high-sensitivity signal processing. The method of claim 2,
The sampling control unit
When the target frequency is a kHz band, controlling the first sampling unit to perform the first sampling at a frequency less than the target frequency 100 Hz,
When the target frequency is in the MHz band, controlling the first sampling unit to perform the first sampling at a frequency lower than the target frequency by 1000 Hz
Signal detection device using high-sensitivity signal processing. The method of claim 2,
The peak value detector detects the peak value for each sampling section determined by the following equation,

(Where LCM(f _s1 , f _t ) is the LCM of f _s1 , and f _t , f _t is the target frequency, and f _s1 is the first sampling frequency)
The sampling control unit determines a target signal sampling time point based on a time point at which each peak value occurs for each sampling section from a first sampling start time point.
Signal detection device using high-sensitivity signal processing. The method of claim 2,
The sampling control unit
The first sampling unit is controlled to perform the first sampling n times (n is an integer greater than or equal to 1), and a time point at which the peak value is detected in the n+1th execution of the first sampling is determined as the target signal sampling time point doing
Signal detection device using high-sensitivity signal processing. Performing first sampling with a first sampling frequency different from the target frequency of the detection target signal by a fine adjustment value;
Detecting a peak value having the largest voltage level among values sampled through the first sampling;
Determining a target signal sampling time point for sampling at the same frequency as the target frequency based on the time point at which the peak value occurs;
Performing a second sampling on the input signal at a second sampling frequency equal to the target frequency from the target signal sampling time point; And
And determining whether the input signal corresponds to the detection target signal based on the power level magnitude of the sampling values in the second sampling.
High-sensitivity signal processing method performed by a signal detection device.

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