Transmitter for village broadcasting and receiver thereof
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2026-08-12
Smart Images
Figure PAT00002_ABST
Abstract
Description
Technology Field
[0001] The contents disclosed in this specification relate to village broadcasting and transmitters or receivers used therein. Background Technology
[0002] Unless otherwise indicated in this specification, the contents described in this section are not prior art for the claims of this application, and are not to be recognized as prior art simply because they are included in this section.
[0003] Generally, when a microphone broadcast is made from the village hall, the message is broadcast to the entire village through, for example, wired horn speakers placed throughout the village.
[0004] Since there is a certain distance between households in the village, the dissemination of information regarding emergencies to the person in charge of village affairs—for example, regarding various announcements, notices, fires, pipes freezing in midwinter, or other critical situations—may be delayed.
[0005] Therefore, there are many villages that already have broadcasting facilities at the village level; these facilities involve installing a village broadcasting transmitter at the village hall and connecting the receiver and speakers to a separate location.
[0006] For reference, the village broadcast transmitter and receiver can be made into a single unit.
[0007] Existing village broadcasting transmitters and receivers have a problem where the listening quality of broadcast content is degraded by external environmental noise, such as vehicle noise, wind noise, and machinery operation noise.
[0008] This noise causes inconvenience to users, especially those listening to broadcasts through speakers in outdoor environments.
[0009] To date, basic filtering devices have been applied to some transmitters to reduce noise, but technology capable of actively removing external noise is limited.
[0010] The prior art with this background is to the extent of the following. Prior art literature
[0011] Reference 1 Domestic Registration No. 20-0442632
[0012] Reference 2 Domestic Publication No. 10-2019-00235702
[0013] Reference 3 Domestic Registration No. 10-2011002
[0014] Reference 4 European Register No. 00721726 The problem to be solved
[0015] The disclosed invention aims to provide a village radio broadcast transmitter and receiver that improve the quality of transmitted and received audio sources by introducing active noise cancellation technology to the village radio broadcast transmitter and receiver to analyze external noise and generate a corresponding opposite waveform. means of solving the problem
[0016] A village broadcasting transmitter and receiver according to an embodiment are,
[0017] First, it provides technology that improves the clarity and quality of broadcasts by equipping village broadcast transmitters and receivers with an active noise cancellation function that eliminates external noise.
[0018] This enables the transmission of a sound source capable of eliminating noise by detecting external noise through a microphone, analyzing it, and combining the generated inverse waveform with the transmitted sound source.
[0019] Specifically, the village broadcasting transmitter according to the embodiment is,
[0020] Microphone receiving ambient noise signals;
[0021] A signal processor that calculates a compensation signal for a noise signal received from the above microphone;
[0022] An Active Noise Cancellation (ANC) module that generates a noise-compensating village broadcast signal by synthesizing the compensation signal calculated by the above signal processor and the sound source signal for village broadcasting;
[0023] A DAC that converts the signal synthesized by the above ANC module into an analog signal;
[0024] A communication unit that transmits the signal converted by the above DAC; and
[0025] A control unit that controls the microphone or the communication unit; is included,
[0026] The method for calculating a noise signal compensation signal of the above signal processor
[0027] A first step of converting a noise signal received from the above microphone into a digital signal;
[0028] A second step of FFT processing the signal converted in the first step above;
[0029] A third step of extracting the phase of the corresponding noise signal from the signal processed in the second step above; and
[0030] A fourth step of calculating an inverse phase for the phase extracted in the third step above; comprising,
[0031] The method for generating a village broadcast signal for noise compensation of the above ANC module
[0032] Generating by synthesizing the inverse phase noise signal calculated in the above 4th step and the village broadcast sound source signal, and
[0033] When the communication unit transmits the corresponding signal, the calculated inverse phase noise signal and the surrounding noise signal cancel each other out.
[0034] A village broadcasting receiver according to an embodiment is,
[0035] A receiver that receives village broadcast signals and ambient noise signals;
[0036] A signal processor that calculates a compensation signal for a noise signal received from the above receiver;
[0037] An ANC module that synthesizes the compensation signal calculated by the signal processor and the village broadcast signal to generate a village broadcast signal for noise compensation;
[0038] A DAC that converts the signal synthesized by the above ANC module into an analog signal;
[0039] A voice output unit that outputs a signal converted by the above DAC; and
[0040] A control unit that controls the receiver to the voice output unit; comprising
[0041] The method for calculating a noise signal compensation signal of the above signal processor
[0042] A first step of converting a noise signal received from the above receiver into a digital signal;
[0043] A second step of FFT processing the signal converted in the first step above;
[0044] A third step of extracting the phase of the corresponding noise signal from the signal processed in the second step above; and
[0045] A fourth step of calculating an inverse phase for the phase extracted in the third step above; comprising,
[0046] The method for generating a village broadcast signal for noise compensation of the above ANC module
[0047] Generating by synthesizing the inverse phase noise signal calculated in the above 4th step and the above village broadcast signal, and
[0048] When the corresponding signal is output from the voice output unit, the calculated inverse phase noise signal and the surrounding noise signal cancel each other out; characterized by this. Effects of the invention
[0049] According to an embodiment, the clarity and quality of the broadcast are improved by equipping the village broadcast transmitter and receiver with an active noise cancellation function that eliminates external noise.
[0050] Active noise cancellation technology is introduced to village wireless broadcast transmitters and receivers to analyze external noise and generate a corresponding inverse waveform, thereby improving the quality of transmitted and received audio sources.
[0051] Accordingly, it improves the clarity of broadcast content even in noisy environments, provides clear broadcasts to listeners in emergency situations, is compatible with existing transmitters, and allows for upgrades with only an additional ANC module. Brief explanation of the drawing
[0052] FIG. 1 is a conceptual diagram of a village broadcasting transmitter according to a first embodiment of the present invention. FIG. 2 is a conceptual diagram of a village broadcasting receiver according to a first embodiment of the present invention. Figure 3 is a configuration diagram of the transmitter of Figure 1. Figure 4 is a configuration diagram of the receiver of Figure 2. FIG. 5 is a flowchart illustrating the operation of the transmitter of FIG. 1. Figure 6 is an example diagram illustrating noise extraction applied to the transmitter of Figure 1. FIGS. 7 to 12 are experimental result diagrams explaining the effects of the transmitter and receiver of FIGS. 1 and 2. Specific details for implementing the invention
[0053] FIG. 1 is a drawing for conceptually explaining a village broadcasting transmitter according to a first embodiment of the present invention.
[0054] As illustrated in FIG. 1, the village broadcasting transmitter (100) according to the first embodiment first improves the clarity and quality of the broadcast by equipping the village broadcasting transmitter (100) with an active noise removal function that removes external noise.
[0055] That is, active noise removal technology is introduced to the village wireless broadcast transmitter (100) to analyze external noise and generate a corresponding opposite waveform, thereby improving the quality of the transmitted and received sound source.
[0056] To this end, the village broadcasting transmitter (100) according to the first embodiment detects external noise through a microphone and analyzes it to generate an opposite waveform, which is then combined with the sound source being transmitted, thereby enabling the transmission of a sound source capable of removing noise.
[0057] More specifically, regarding the active noise removal function of the village broadcasting transmitter (100), first, noise signals around the village broadcasting transmitter (100), that is, around the village, are extracted.
[0058] For example, it extracts vehicle noise, wind noise, machine operation noise, etc.
[0059] Next, the phase of this noise signal is determined, the inverse phase corresponding to it—that is, an inverse phase with a 180-degree difference—is calculated, and a noise signal corresponding to the inverse phase is generated.
[0060] The noise signal and the audio signal for village broadcasting are combined to create a village broadcast signal.
[0061] When the above village broadcast signal is transmitted to village broadcast receivers, that is, to each household within the village, the inverse phase noise signal within the signal and the surrounding noise signals cancel each other out to provide only a high-quality audio signal for village broadcasting.
[0062] The aforementioned audio signal for village broadcasting may, for example, be a voice signal directly providing guidance or announcements by the village head or other person in charge of village affairs. In addition, it may be a recorded voice signal for various guidance, announcements, etc.
[0063] Accordingly, it improves the clarity of broadcast content even in noisy environments, provides clear broadcasts to listeners in emergency situations, is compatible with existing transmitters, and allows for upgrades with only an additional ANC module.
[0064] FIG. 2 is a conceptual diagram of a village broadcasting receiver according to the first embodiment.
[0065] Referring to FIG. 2, the village broadcast receiver (200) according to the first embodiment, in the same way as the village broadcast transmitter (100), analyzes external noise by active noise removal and generates a corresponding opposite waveform to improve the quality of the transmitted and received sound source.
[0066] However, such noise includes noise in the wireless space, as well as noise caused by other components, power supply, etc.
[0067] A village broadcasting receiver (200) according to the first embodiment detects such noise through the receiver and analyzes it to generate an opposite waveform, which is then combined with a sound source to enable the transmission of a sound source capable of removing noise. For reference, the receiver may have a voice input device, a chip, and software for noise detection.
[0068] The above village broadcast receiver (200) first extracts noise signals from the surroundings of the village broadcast receiver (200), that is, noise signals from the surroundings of the village, such as the corresponding components, power supply, etc.
[0069] For example, noise signals around a village include vehicle noise, wind noise, and machine operation noise.
[0070] Next, the phase of this noise signal is determined, the inverse phase corresponding to it—that is, an inverse phase with a 180-degree difference—is calculated, and a noise signal corresponding to the inverse phase is generated.
[0071] The noise signal created in this way is combined with the village broadcast signal transmitted from the village broadcast transmitter (100).
[0072] When the village broadcast signal synthesized in this way is output to each household in the village through speakers, the inverse phase noise signal within the signal and the surrounding noise signals cancel each other out, so that only a high-quality audio signal for village broadcasting is output.
[0073] Figure 3 is a configuration diagram of the village broadcasting transmitter (100) of Figure 1.
[0074] Referring to FIG. 3, the village broadcasting transmitter (100) of FIG. 1 mainly includes a microphone (101), a signal processor (102), an ANC (Active Noise Cancellation) module (103), a DAC (104), a communication unit (105), and a control unit (106).
[0075] The above microphone (101) receives the village broadcast transmitter (100), that is, the ambient noise signal of the village.
[0076] The signal processor (102) calculates a compensation signal for the noise signal received from the microphone (101). That is, it detects external noise and analyzes it to create an inverse phase, i.e., an opposite waveform.
[0077] The above ANC module (103) synthesizes the compensation signal calculated by the signal processor (102) and the sound source signal for village broadcasting to generate a noise-compensating village broadcasting signal.
[0078] The above DAC (104) converts the signal synthesized by the above ANC module (103) into an analog signal.
[0079] The communication unit (105) transmits the signal converted by the DAC (104).
[0080] The control unit (106) controls the microphone (101) to the communication unit (105) to detect external noise through the microphone (101), analyze the noise to create an opposite waveform, and combine the generated opposite waveform with a sound source to enable the transmission of a sound source capable of removing noise.
[0081] Figure 4 is a configuration diagram of the village broadcast receiver (200) of Figure 2.
[0082] Referring to FIG. 4, the village broadcast receiver (200) of FIG. 2 mainly includes a receiver (201), a signal processor (202), an ANC module (203), a DAC (204), a voice output unit (205), and a control unit (206).
[0083] The receiver (201) receives village broadcast signals and ambient noise signals. This noise includes noise in the wireless space, as well as noise caused by other components, power supply, etc.
[0084] The signal processor (202) calculates a compensation signal for the noise signal received from the receiver (201). That is, it detects external noise and analyzes it to create an inverse phase, i.e., an opposite waveform.
[0085] The above ANC module (203) synthesizes the compensation signal calculated by the signal processor (202) and the village broadcast signal.
[0086] The above DAC (204) converts the signal synthesized by the above ANC module (203) into an analog signal.
[0087] The above voice output unit (205) transmits the signal converted by the DAC (204).
[0088] The control unit (206) controls the receiver (201) to the voice output unit (205) to detect external noise through the receiver (201), analyze it to create an opposite waveform, combine the generated opposite waveform with a sound source for village broadcasting, and transmit it through a speaker. Through this, the opposite waveform and surrounding noise within the signal cancel each other out, so that only a high-quality sound source signal for village broadcasting is transmitted to the villagers.
[0089] FIG. 5 is a flowchart illustrating the operation of the village broadcasting transmitter (100) of FIG. 1.
[0090] Referring to FIG. 5, the village broadcasting transmitter (100) of FIG. 1 first receives an ambient noise signal from the microphone (101) under the control of the control unit (106) (S101).
[0091] Next, the signal processor (102) calculates a compensation signal for the noise signal received from the microphone (101).
[0092] The above ANC module (103) synthesizes the compensation signal calculated by the signal processor (102) and the sound source signal for village broadcasting to generate a noise-compensating village broadcasting signal.
[0093] The above DAC (104) converts the signal synthesized by the above ANC module (103) into an analog signal.
[0094] The communication unit (105) transmits the signal converted by the DAC (104).
[0095] Meanwhile, the method for calculating the compensation signal of the noise signal of the signal processor (102) is as follows.
[0096] First, the noise signal received from the microphone (101) is converted into a digital signal (S102).
[0097] The above converted signal is data logged (S103) and Fast Fourier Transform (FFT) is processed (S104).
[0098] For example, the average value is detected from the data-logged signal, and then processed using FFT.
[0099] The phase of the corresponding noise signal is extracted from the processed signal above (S105).
[0100] Calculate the inverse phase for the above-extracted phase (S106).
[0101] The mathematical expression for noise removal is as follows.
[0102] Speech signals, or sound waves, are expressed as functions that change over time.
[0103] Noise signal: S(t) = Assin(ωt + Φs)S(t) = A_s \sin(\omega t + \phi_s)S(t) = Assin(ωt + Φs)
[0104] Generated signal: C(t) = Acsin(ωt + Φc)C(t) = A_c\sin(\omega t + \phi_c)C(t) = Acsin(ωt + Φc)
[0105] Here, As, AcA_s, A_cAs, and Ac are the amplitudes of the noise signal and the generated signal, respectively, ω ω is the angular frequency (2π × frequency), and Φs, Φc Φs, Φc Φs, and Φc are the phases of the noise signal and the generated signal, respectively.
[0106] The cancellation condition is that the two signals must be in opposite phase for complete cancellation. That is, Φc = Φs + π φ_c = φ_s + π Φc = Φs + πAc = AsA_c = A_sAc = As.
[0107] Accordingly, the composite signal, that is, the signal when noise and the opposite signal are added, is as follows.
[0108] R(t) = S(t) + C(t) = Assin(ωt + Φs) + Assin(ωt + Φs + π)R(t) = S(t) + C(t) = A_s \sin(\omega t + \phi_s) + A_s \sin(\omega t + \phi_s + \pi)R(t) = S(t) + C(t) = Assin(ωt) + Φs) + Assin(ωt + Φs + π).
[0109] In the above equation, due to the opposite phase (π π) property, the two signals cancel each other out, so R(t) = 0, meaning noise can be removed.
[0110] Accordingly, the method for generating a village broadcast signal for noise compensation of the above ANC module (103) is as follows.
[0111] The above-calculated inverse phase noise signal and the above-calculated village broadcast sound source signal are combined to generate (S107).
[0112] Through this, the signal produced by the synthesis is converted into an analog signal by the DAC (104), and the corresponding signal is transmitted from the communication unit (105) (S108).
[0113] According to an embodiment, in such a case, the calculated inverse phase noise signal and the surrounding noise signal cancel each other out, and the sound source signal for village broadcasting can be transmitted to the receiver side with high quality.
[0114] FIG. 6 is an example diagram illustrating noise signal extraction applied to the transmitter (100) of FIG. 1.
[0115] Referring to FIG. 6, the transmitter (100) of FIG. 1 collects surrounding noise signals through the microphone (101), and FIG. 6 assumes a situation where a person in charge of village affairs may input a voice signal through the microphone (101).
[0116] In this case, it must be possible to distinguish between noise signals and voice signals received through the microphone (101).
[0117] To this end, an adaptive signal processing method is applied.
[0118] In the above adaptive signal processing technique, first, the ambient noise signal (x(k)) and the target signal (d(k)) originate from the same noise source, and microphone 1 (101-1) collects them. However, x(k) = x(kT s ) and T s is the sampling period.
[0119] A desired signal d(k) and noise x(k) are simultaneously input to a microphone 1 (101-1) located close to a noise source (101-1), and only the target signal (d(k)) is input to a microphone 2 (101-2) located relatively far from it.
[0120] The transfer functions of path 1 and path 2 are unknown, and if we define them as H1(z) and H2(z), respectively, then x(k) = H1(q)n(k) and d(k) = H2(q)n(k), so we establish the relationship x(k) = [H1(q) / H2(q)]d(k). The above n(K) is the target signal.
[0121] Therefore, the actual configuration can be obtained from the figure below. In the figure below, as the adaptive filter converges from B(z) to H1(q) and 1-A(z) to H2(q), it follows that y(k) to s(k), and thus only the noise signal can be obtained by converging from e(k) to d(k).
[0122] The above adaptive signal processing technique can, for example, exclude only the original speech signal from ambient noise.
[0123] The above adaptive signal processing technique excludes noise similar to the reference noise from the original signal mixed with noise through an adaptive filter. In other words, the desired motor sound wave is acquired by mixing it with the surrounding noise.
[0124] Accordingly, the pre-acquired ambient noise is fed as the input to the adaptive filter. When this reference signal enters the adaptive filter, it minimizes the error between the original signal and the algorithm's output.
[0125] The most commonly used algorithms include the LMS (Least Mean Square) algorithm and the NLMS (Normalized Least Mean Square) algorithm.
[0126]
[0127] The adaptive filter H(n) is a vector of M samples received through the input buffer at some time n, and this vector contains the adaptive filter coefficients for some time n. Here, μ is a value that determines the degree of convergence. This algorithm feeds back to the adaptive filter to minimize the filter's output, e(n).
[0128] FIGS. 7 to 12 are experimental result diagrams showing the effects of the transmitter and receiver (100, 200) of FIGS. 1 and 2.
[0129] Referring to FIGS. 7 to 12, the transmitter and receiver (100, 200) according to the embodiment have a signal-to-noise ratio (SNR) of 9dB to 10dB when noise is removed, and a signal-to-noise ratio of 26dB to 27dB when noise is removed.
[0130] In addition, when fine noise was removed, good frequency SWEEP measurement results were obtained at 1K ~ 1.5KHz, 0.3 ~ 1.0HKHz, and 1.5K ~ 2.0KHz.
[0131] For reference, Fig. 7 is a signal-to-noise ratio measurement configuration diagram, and Fig. 9 is a frequency SWEEP measurement configuration diagram.
[0132] Meanwhile, in the aforementioned embodiment, when synthesizing a noise signal and a sound source signal for village broadcasting, there may be a signal delay resulting therefrom.
[0133] To this end, the following operations are performed to prevent signal delay caused by the inclusion of noise signals.
[0134] In particular, it separately identifies sections of the audio signal for village broadcasting where significant noise occurs, and applies compression to the signal in those sections to protect the original sound and effectively prevent signal delay.
[0135] Specifically, the method for generating a village broadcast signal for noise compensation of the above ANC module (103) is as follows.
[0136] First, measure the signal strength of the above-mentioned village broadcast audio signal.
[0137] Detects a signal above the set level using the above-mentioned measured signal strength.
[0138] The range of signal strength change for the above-detected signal is detected for each section of the corresponding sound source signal.
[0139] Among the above-detected intervals, intervals in which the range of change in signal strength of the corresponding sound source signal exceeds a set value are detected.
[0140] Therefore, the intensity and length of the inverse phase noise signal calculated above are extracted.
[0141] The compression strength and length are set in correspondence with the extracted strength and length above.
[0142] Accordingly, the detected section is compressed according to the set compression strength and length, and the remaining section is not compressed.
[0143] The above-calculated out-of-phase noise signal and the village broadcast audio signal of the above-compressed and uncompressed sections are combined.
[0144] Meanwhile, in another embodiment, when detecting the range of signal strength variation of a sound source in each of the aforementioned embodiments, noise is generally exhibited; however, this is reduced using a cycle control method to obtain precise data, thereby enabling high-quality signal processing.
[0145] In addition, this protects the original sound and prevents signal delay caused by compression processing.
[0146] The above cycle control method detects the change in signal strength of a sound source by extracting a surface that repeats an on / off cycle at a constant rate during a certain arbitrary period. Since this turns on or off at the zero point of the AC when turning on or off, it can significantly reduce noise compared to the phase control method and has good linearity in load control.
[0147] The above cycle control method utilizes the fact that the signal strength variation range of a sound source has an arbitrary variation range at a certain level, divides the period into N equal parts according to the variation range, and extracts based on the deviation within them.
[0148] Specifically, in the example described above, when a signal with a strength greater than or equal to the set strength is detected, the signal strength change range for the detected signal is leveled to a set unit level for each corresponding sound source signal segment, and the number of levelings is detected.
[0149] Therefore, the signal strength variation range is calculated as the signal strength variation range for each section divided by the number of leveling points for each section.
[0150] For example, the signal strength status is continuously monitored to calculate the signal strength variation range that varies as + or - at a certain level.
[0151] Signal strength conditions include normal signal conditions, abnormal signal conditions, signal strength, the amount of change or the range of change, etc.
[0152] Therefore, in extracting the range of signal strength variation of a sound source, it is possible to obtain precise data by reducing noise occurring during the operation, thereby enabling high-quality signal processing.
[0153] In addition, this protects the original sound and prevents signal delay caused by compression processing.
[0154] In addition, in a situation where multiple speakers of the same value are used for this range of change—that is, when multiple speakers are used within the same area in a village—the above cycle control method has an extended concept.
[0155] This extended concept calculates (the range of signal strength change for each section / the number of leveling points for each section × 2n, where n is the number of speakers in the same area).
[0156] And, this is applied as the signal strength change range. Considering that the above 2n causes noise by affecting multiple speakers, the noise can be stably reduced for each of the multiple speakers individually based on the number of speakers, thereby enabling stable signal processing.
[0157] This applies equally to the village broadcast receiver (200). Explanation of the symbols
[0158] 100 : Village broadcast transmitter 200 : Village broadcasting receiver
Claims
Claim 1 A microphone (101) that receives an ambient noise signal; a signal processor (102) that calculates a compensation signal for the noise signal received from the microphone (101); an ANC module (103) that generates a noise-compensating village broadcast signal by synthesizing the compensation signal calculated by the signal processor (102) and a sound source signal for village broadcasting; a DAC (104) that converts the signal synthesized by the ANC module (103) into an analog signal; a communication unit (105) that transmits the signal converted by the DAC (104); and a control unit (106) that controls the microphone (101) to the communication unit (105); and a method for calculating a noise signal compensation signal of the signal processor (102) comprises: a first step of converting the noise signal received from the microphone (101) into a digital signal; a second step of performing FFT processing on the signal converted in the first step; and a third step of extracting the phase of the corresponding noise signal from the signal processed in the second step. A village broadcasting transmitter comprising: a fourth step of calculating an inverse phase for the phase extracted in the third step; and a method for generating a village broadcasting signal for noise compensation of the ANC module (103), wherein the inverse phase noise signal calculated in the fourth step and the village broadcasting sound source signal are synthesized to generate the signal, and when the communication unit (105) transmits the signal, the calculated inverse phase noise signal and the surrounding noise signal cancel each other out. Claim 2 In claim 1, the method for generating a noise compensation village broadcast signal of the ANC module (103) comprises: a first step of measuring the signal strength of the village broadcast sound source signal; a second step of detecting a signal greater than or equal to a set level with respect to the signal strength measured in the first step; a third step of detecting the signal strength change range for the signal detected in the second step for each section of the corresponding sound source signal; a fourth step of detecting a section among the sections detected in the third step in which the signal strength change range of the corresponding sound source signal is greater than or equal to a set value; a fifth step of extracting the strength and length of the inverse phase noise signal calculated in the fourth step; a sixth step of setting the compression strength and length corresponding to the strength and length extracted in the fifth step; and a seventh step of compressing the detected section according to the set compression strength and length in the fourth and sixth steps, and leaving the remaining section uncompressed. A village broadcasting transmitter comprising: an 8th step of synthesizing the calculated inverse phase noise signal and the village broadcasting sound source signal of the compressed and uncompressed sections after the 7th step above. Claim 3 A village broadcasting transmitter according to claim 2, wherein the third step comprises: a 3-1 step of detecting the number of levelings by leveling the signal strength change range for the signal detected in the second step to a set unit level for each corresponding sound source signal section; and a 3-2 step of calculating the signal strength change range as the signal strength change range for each section / the number of levelings for each section in the 3-1 step. Claim 4 A village broadcasting transmitter according to claim 3, wherein the 3-2 step calculates the signal strength change range as the signal strength change range for each section / number of leveling points for each section × 2n when n speakers for village broadcasting are used within a set area. Claim 5 A receiver (201) that receives a village broadcast signal and an ambient noise signal; a signal processor (202) that calculates a compensation signal for the noise signal received from the receiver (201); an ANC module (203) that synthesizes the compensation signal calculated by the signal processor (202) and the village broadcast signal to generate a village broadcast signal for noise compensation; a DAC (204) that converts the signal synthesized by the ANC module (203) into an analog signal; a voice output unit (205) that outputs the signal converted by the DAC (204); and a control unit (206) that controls the receiver (201) to the voice output unit (205); and the method for calculating a compensation signal for the noise signal of the signal processor (202) comprises: a first step of converting the noise signal received from the receiver (201) into a digital signal; a second step of performing FFT processing on the signal converted in the first step; and a third step of extracting the phase of the corresponding noise signal from the signal processed in the second step. A village broadcasting receiver comprising: a fourth step of calculating an inverse phase for the phase extracted in the third step; and a method for generating a village broadcasting signal for noise compensation of the ANC module (203), wherein the inverse phase noise signal calculated in the fourth step and the village broadcasting signal are synthesized to generate the signal, and when the corresponding signal is output from the voice output unit (205), the calculated inverse phase noise signal and the surrounding noise signal cancel each other out. Claim 6 In claim 5, the method for generating a noise compensation village broadcast signal of the ANC module (103) comprises: a first step of measuring the signal strength of the village broadcast sound source signal; a second step of detecting a signal greater than or equal to a set level with respect to the signal strength measured in the first step; a third step of detecting the signal strength change range for the signal detected in the second step for each section of the corresponding sound source signal; a fourth step of detecting a section among the sections detected in the third step in which the signal strength change range of the corresponding sound source signal is greater than or equal to a set value; a fifth step of extracting the strength and length of the inverse phase noise signal calculated in the fourth step; a sixth step of setting the compression strength and length corresponding to the strength and length extracted in the fifth step; and a seventh step of compressing the detected section according to the set compression strength and length in the fourth and sixth steps, and leaving the remaining section uncompressed. A village broadcasting receiver comprising: an 8th step of synthesizing the calculated inverse phase noise signal and the village broadcasting sound source signal of the compressed and uncompressed sections after the 7th step above. Claim 7 A receiver for village broadcasting according to claim 6, wherein the third step comprises: a 3-1 step of detecting the number of levelings by leveling the signal strength change range for the signal detected in the second step to a set unit level for each corresponding sound source signal section; and a 3-2 step of calculating the signal strength change range as the signal strength change range for each section / the number of levelings for each section in the 3-1 step. Claim 8 A receiver for village broadcasting according to claim 7, wherein the 3-2 step calculates the signal strength change range as the signal strength change range for each section / number of leveling points for each section × 2n when n speakers for village broadcasting are used within a set area.