A method and system for testing low-noise power supplies using waveforms

Abstract

This invention belongs to the field of communication noise detection and processing technology, and relates to a method and system for testing low-noise power supplies using waveforms. The method connects the power supply under test (DUT) and a voice gateway, and powers them on in real time. The voice gateway is connected to an external noise-shielded environment via its voice interface. Within this environment, the voice gateway is modulated to a periodic state of comfortable noise or a dial tone, and the sound is played. The playing sound is acquired and processed, and based on the processed sound and the sound signal waveform, the noise level of the DUT is detected in real time. This transforms uncontrollable human-induced noise into an electrical signal measurable by an oscilloscope, accurately determining whether the power supply meets requirements. In other words, by utilizing a clean environment, the unmeasurable power frequency noise on the telephone line is converted into a differential-mode signal measurable by an oscilloscope through a physical sound isolation process, providing testers with an objective experimental result.

Description

Technical Field

[0001] This invention belongs to the field of communication noise detection and processing technology, specifically relating to a method and system for testing low-noise power supplies using waveforms. Background Technology

[0002] While mobile phone penetration is high, traditional landline telephones still enjoy widespread use. The demand for central office equipment (such as voice gateways and PBXs) connected to these phones remains significant. For metal-cased devices, a grounding wire can solve the problem. However, for adapter power supplies, since only L / N lines are needed and no ground wire is required, if a voice gateway uses a standard power supply, an abnormal electrical noise (hereafter replaced with power frequency noise) will be heard during calls. Therefore, voice devices using 2-pin adapters must use a low-noise power supply to eliminate this abnormal noise.

[0003] Because abnormal noises resembling electrical currents are caused by power frequency interference, which falls under common-mode interference, they cannot be directly measured using methods such as oscilloscopes. Traditional testing methods rely on personnel listening to microphone sounds to determine if a low-noise power supply meets requirements. However, individual sensitivity to noise varies with age and personality, leading to significant subjective bias and occasional misjudgments. Therefore, to address these technical shortcomings, there is an urgent need to design and develop a method and system for testing low-noise power supplies using waveform analysis. Summary of the Invention

[0004] To overcome the shortcomings and difficulties of the existing technology, the purpose of this invention is to provide a method and system for testing low-noise power supplies using waveforms, which can transform uncontrollable human-caused differences into electrical signals that can be measured with an oscilloscope, and accurately determine whether the power supply meets the requirements.

[0005] The first objective of this invention is to provide a method for testing low-noise power supplies using waveforms;

[0006] A second objective of this invention is to provide a system for testing low-noise power supplies using waveforms;

[0007] The first objective of this invention is achieved as follows: the method comprises the following steps:

[0008] Connect the power supply under test and the voice gateway, and power it on in real time;

[0009] The voice gateway connects to an environment shielded from external noise via its voice interface.

[0010] In an environment shielded from external noise, the voice gateway is modulated to a periodic state of comfortable noise or dial tone; and the sound is played.

[0011] The system acquires and processes the sound being played, and based on the processed sound and the sound signal waveform, detects the noise level of the power supply under test in real time.

[0012] Furthermore, the step of connecting the power supply under test and the voice gateway, and powering them on in real time, also includes the following steps:

[0013] Connect the power supply under test to AC220V, and connect the output DC12V to the gateway device.

[0014] Furthermore, the step of connecting to an external noise-shielded environment via the voice interface of the voice gateway also includes the following steps:

[0015] Obtain the normal startup signal of the voice gateway device;

[0016] Based on the activation signal, connect the voice interface of the gateway device to the external noise shielding environment interface.

[0017] Furthermore, the external noise shielding environment interface is an RJ11 interface;

[0018] The step of connecting the voice interface of the gateway device to the external noise shielding environment interface specifically involves connecting the voice interface of the gateway device to the RJ11 interface of the external noise shielding environment via a telephone line.

[0019] Furthermore, the step of modulating the voice gateway to a periodic state of comfortable noise or dial tone within an environment shielded from external noise, and playing sound, further includes the following steps:

[0020] Normal voice signals and power frequency noise are played through hands-free mode.

[0021] Furthermore, the step of acquiring and processing the playing sound, and detecting the noise level of the power supply under test in real time based on the processed sound and the sound signal waveform, also includes the following steps:

[0022] Get comfortable noise or dial tone;

[0023] The detected analog signal is transmitted and processed in real time.

[0024] Furthermore, the transmission of the detected analog signal and the real-time processing of the analog signal further includes the step of:

[0025] The received analog signal is amplified and then output.

[0026] Furthermore, the step of acquiring and processing the playing sound, and detecting the noise level of the power supply under test in real time based on the processed sound and the sound signal waveform, also includes the following steps:

[0027] The amplitude data of the dial tone is acquired, and the power supply under test is determined to meet the predetermined requirements based on the amplitude data of the dial tone.

[0028] The second objective of the present invention is achieved as follows: the system comprises:

[0029] The first connection unit is used to connect the power supply under test and the voice gateway, and to power on it in real time;

[0030] The second connection unit is used to connect to an external noise-shielded environment through the voice interface of the voice gateway;

[0031] The modulation unit is used to modulate the voice gateway to a periodic state of comfortable noise or dial tone in an environment shielded from external noise, and to play sound;

[0032] The noise detection unit is used to acquire and process the sound being played, and based on the processed sound and the sound signal waveform, to detect the noise level of the power supply under test in real time.

[0033] Furthermore, the first connection unit further includes:

[0034] The first connection module is used to connect the power supply under test to AC220V voltage and connect the output DC12V to the gateway device;

[0035] And / or, the second connection unit further includes:

[0036] The first acquisition module is used to acquire the normal startup signal of the voice gateway device;

[0037] The second connection module is used to connect the voice interface of the gateway device to the external noise shielding environment interface according to the start signal.

[0038] The external noise shielding environment interface is an RJ11 interface;

[0039] The step of connecting the voice interface of the gateway device to the external noise shielding environment interface specifically involves connecting the voice interface of the gateway device to the RJ11 interface of the external noise shielding environment via a telephone line.

[0040] And / or, the modulation unit further includes:

[0041] The playback module is used to play normal voice signals and power frequency noise through a hands-free method;

[0042] And / or, the noise detection unit further includes:

[0043] The second acquisition module is used to acquire comfort noise or dial tone;

[0044] A transmission processing module is used to transmit the detected analog signal and process the analog signal in real time.

[0045] The determination module is used to acquire the amplitude data of the dial tone and, based on the amplitude data of the dial tone, determine whether the power supply under test meets the predetermined requirements.

[0046] And / or, the transmission processing module further includes:

[0047] An amplification output module is used to amplify the received analog signal and output the analog signal.

[0048] This invention connects the power supply under test and a voice gateway, and powers them on in real time. The voice gateway is connected to an environment shielded from external noise via its voice interface. Within this environment, the voice gateway is modulated to a periodic state of comfortable noise or dial tone, and the sound is played. The playing sound is acquired and processed, and based on the processed sound and the sound signal waveform, the noise level of the power supply under test is detected in real time. This method can transform uncontrollable human-caused differences into electrical signals that can be measured with an oscilloscope, accurately determining whether the power supply meets the requirements.

[0049] In other words, by using a clean environment, the power frequency noise on the telephone line, which is otherwise unmeasurable, is converted into a differential mode signal that can be measured with an oscilloscope through a physical sound isolation process, thus providing testers with an objective experimental result. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic flowchart of a method for testing low-noise power supplies using waveforms according to the present invention.

[0052] Figure 2 This is a schematic diagram of a system architecture for testing low-noise power supplies using waveforms, according to the present invention.

[0053] Figure 3 This is a schematic diagram of a platform architecture for testing low-noise power supplies using waveforms, according to the present invention.

[0054] Figure 4 This is a schematic diagram of common-mode interference in a method for testing low-noise power supplies using waveforms according to the present invention.

[0055] Figure 5This is a schematic diagram of the structural framework of a detection device according to a specific embodiment of a method for testing low-noise power supplies using waveforms according to the present invention.

[0056] Figure 6 This is a schematic diagram illustrating the detection principle framework of a specific embodiment of the method for testing low-noise power supplies using waveforms according to the present invention.

[0057] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] To facilitate a clearer understanding of the objectives, technical solutions, and advantages of this invention, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art can easily understand other advantages and effects of this invention from the content disclosed in this specification.

[0059] This invention can also be implemented or applied through other different specific examples, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of this invention.

[0060] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0061] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Secondly, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0062] Preferably, the method for testing low-noise power supplies using waveforms according to the present invention is applied in one or more terminals or servers. The terminal is a device capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc.

[0063] The terminal can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal can interact with the customer via a keyboard, mouse, remote control, touchpad, or voice control device.

[0064] This invention provides a method and system for testing low-noise power supplies using waveforms.

[0065] like Figure 1 The diagram shown is a flowchart of a method for testing low-noise power supplies using waveforms, provided in an embodiment of the present invention.

[0066] In this embodiment, the method for testing low-noise power supplies using waveforms can be applied to terminals or fixed terminals with display functions. The terminals are not limited to personal computers, smartphones, tablets, desktop computers or all-in-one computers with cameras, etc.

[0067] The method for testing low-noise power supplies using waveforms can also be applied to a hardware environment consisting of a terminal and a server connected to the terminal via a network. The network includes, but is not limited to, a wide area network (WAN), a metropolitan area network (MAN), or a local area network (LAN). The method for testing low-noise power supplies using waveforms in this embodiment can be executed by the server, by the terminal, or by both the server and the terminal.

[0068] For example, for terminals that need to perform waveform testing of low-noise power supplies, the waveform testing function provided by the method of this invention can be directly integrated into the terminal, or a client for implementing the method of this invention can be installed. Alternatively, the method provided by this invention can also run on servers or other devices in the form of a Software Development Kit (SDK), providing an interface for waveform testing of low-noise power supplies. Terminals or other devices can then implement the waveform testing of low-noise power supplies through this interface.

[0069] The present invention will be further described below with reference to the accompanying drawings.

[0070] like Figures 1-6 As shown, the present invention provides a method for testing low-noise power supplies using waveforms, the method comprising the following steps:

[0071] S1. Connect the power supply under test and the voice gateway, and power it on in real time;

[0072] S2. Connect to an environment shielded from external noise via the voice interface of the voice gateway;

[0073] S3. In an environment shielded from external noise, modulate the voice gateway to a periodic state of comfortable noise or dial tone; and play the sound.

[0074] S4. Acquire and process the sound being played, and based on the processed sound and the sound signal waveform, detect the noise level of the power supply under test in real time.

[0075] The process of connecting the power supply under test and the voice gateway, and powering them on in real time, also includes the following steps:

[0076] S11. Connect the power supply under test to AC220V, and connect the output DC12V to the gateway device.

[0077] The step of connecting to an external noise-shielded environment via the voice interface of the voice gateway further includes the following steps:

[0078] S21. Obtain the normal startup signal of the voice gateway device;

[0079] S22. Based on the start signal, connect the voice interface of the gateway device to the external noise shielding environment interface.

[0080] The external noise shielding environment interface is an RJ11 interface;

[0081] The step of connecting the voice interface of the gateway device to the external noise shielding environment interface specifically involves connecting the voice interface of the gateway device to the RJ11 interface of the external noise shielding environment via a telephone line.

[0082] The method of modulating the voice gateway to a periodic state of comfortable noise or dial tone within an environment shielded from external noise, and playing sound, further includes the following steps:

[0083] S31. Play normal voice signals and power frequency noise through hands-free mode.

[0084] The step of acquiring and processing the playing sound, and detecting the noise level of the power supply under test in real time based on the processed sound and the sound signal waveform, further includes the following steps:

[0085] S41. Obtain a comfortable noise level or dial tone;

[0086] S42. Transmit the detected analog signal and process the analog signal in real time.

[0087] The transmission of the detected analog signal and the real-time processing of the analog signal further includes the following steps:

[0088] S421. Amplify the received analog signal and output the analog signal.

[0089] The step of acquiring and processing the playing sound, and detecting the noise level of the power supply under test in real time based on the processed sound and the sound signal waveform, further includes the following steps:

[0090] S43. Obtain the amplitude data of the dial tone, and determine whether the power supply under test meets the predetermined requirements based on the amplitude data of the dial tone.

[0091] Specifically, in this embodiment of the invention, a low-noise power supply detection method for a voice gateway is proposed to detect the output signal of the voice interface, improve the accuracy of the test, and solve the problem of misjudgment caused by manual testing.

[0092] The present invention includes: a noise shielding module, a telephone module, a sound detection module, a signal processing module, and an output module.

[0093] The noise shielding module is used to shield external sounds from affecting sound acquisition.

[0094] The telephone module uses a handset and a hands-free function to play out the voice signal.

[0095] The sound detection module is used to convert the detected voice signal back into an electrical signal, using physical grounding to isolate it from power frequency interference.

[0096] The signal processing module is used to process the detected analog signals and output the measurements.

[0097] The output module, simulating a 1REN telephone, is used for oscilloscope measurements to observe power frequency interference.

[0098] This invention includes the following steps:

[0099] S01. Connect the power supply under test and the voice gateway, and power on them;

[0100] S02. Connect the voice interface of the voice gateway to the shielding module via a telephone line;

[0101] S03. The telephone module is placed in the noise shielding module. The hands-free mode is turned on, and the voice gateway is set to a comfortable noise / dialing tone periodic state.

[0102] S04. Close the shielding module and begin signal detection;

[0103] S05. The sound detection module transmits the detected normal sounds and power frequency noise to the signal processing module.

[0104] S06. The signal processed by the signal processing module is led out of the shielding module and connected to the output module for easy testing with an oscilloscope.

[0105] S07. Using the amplitude of the dial tone as a reference, observe the amplitude of the power frequency noise. When the ratio of power frequency noise to dial tone amplitude exceeds 1 / 10, or when the dial tone is not smooth, it is considered unqualified.

[0106] In other words, S001, system test diagram as follows Figure 5 As shown, the power supply under test is connected to AC220V, and the output DC12V is connected to the gateway device, which is powered on.

[0107] S002. Wait for the voice gateway device to start normally, and connect the voice interface of the gateway device to the RJ11 interface of the shielding module through the telephone line.

[0108] S003. Place the telephone module, voice detection module, and signal processing module in the noise shielding module to reduce the impact of external sounds on the test results during testing. In order to compare the power frequency noise / voice signal amplitude of the output module, set the voice gateway to a periodic state of comfortable noise / dialing tone. Turn on the hands-free mode so that normal voice signals and power frequency noise are played out through the hands-free mode.

[0109] S004. Close the noise shielding module to shield external interference and begin testing.

[0110] S005. The sound detection module detects the comfort noise / dialing tone emitted by the telephone module, transmits the detected analog signal to the signal processing module, amplifies the received analog signal, and then transmits it to the output module.

[0111] S006. The output module uses the analog circuit of 1REN as a load to apply the signal received from the signal processing module to the load.

[0112] S007. Using an oscilloscope, with the amplitude of the dial tone as a reference, observe whether the ratio of power frequency noise to dial tone amplitude exceeds 1 / 10, and whether the signal is smooth, to determine whether the power supply under test meets the requirements.

[0113] In general, since the power frequency noise generated by using a regular adapter power supply comes from power frequency interference, which is essentially common-mode interference, it cannot be measured with an oscilloscope. The signal is converted through a ground-separated process to become a signal that can be tested with an oscilloscope, making it easier to determine whether the adapter is a low-noise adapter.

[0114] Against this backdrop, this invention proposes a method for testing low-noise power supplies using waveform analysis. The aim is to address the misjudgment problems caused by manual testing by using an oscilloscope to visually measure common-mode interference and signals. The principle is as follows: Figure 6 As shown.

[0115] To achieve the above objectives, the present invention also provides a system for testing low-noise power supplies using waveforms, such as... Figure 2 As shown, the system specifically includes:

[0116] The first connection unit is used to connect the power supply under test and the voice gateway, and to power on it in real time;

[0117] The second connection unit is used to connect to an external noise-shielded environment through the voice interface of the voice gateway;

[0118] The modulation unit is used to modulate the voice gateway to a periodic state of comfortable noise or dial tone in an environment shielded from external noise, and to play sound;

[0119] The noise detection unit is used to acquire and process the sound being played, and based on the processed sound and the sound signal waveform, to detect the noise level of the power supply under test in real time.

[0120] The first connection unit further includes:

[0121] The first connection module is used to connect the power supply under test to AC220V voltage and connect the output DC12V to the gateway device;

[0122] And / or, the second connection unit further includes:

[0123] The first acquisition module is used to acquire the normal startup signal of the voice gateway device;

[0124] The second connection module is used to connect the voice interface of the gateway device to the external noise shielding environment interface according to the start signal.

[0125] The external noise shielding environment interface is an RJ11 interface;

[0126] The step of connecting the voice interface of the gateway device to the external noise shielding environment interface specifically involves connecting the voice interface of the gateway device to the RJ11 interface of the external noise shielding environment via a telephone line.

[0127] And / or, the modulation unit further includes:

[0128] The playback module is used to play normal voice signals and power frequency noise through a hands-free method;

[0129] And / or, the noise detection unit further includes:

[0130] The second acquisition module is used to acquire comfort noise or dial tone;

[0131] A transmission processing module is used to transmit the detected analog signal and process the analog signal in real time.

[0132] The determination module is used to acquire the amplitude data of the dial tone and, based on the amplitude data of the dial tone, determine whether the power supply under test meets the predetermined requirements.

[0133] And / or, the transmission processing module further includes:

[0134] An amplification output module is used to amplify the received analog signal and output the analog signal.

[0135] In the system solution embodiment of the present invention, the specific details of the method steps involved in testing a low-noise power supply using waveforms have been described above and will not be repeated here.

[0136] To achieve the above objectives, the present invention also provides a platform for testing low-noise power supplies using waveforms, such as... Figure 3 As shown, it includes a processor, memory, and a platform control program that uses waveform testing to test low-noise power supplies;

[0137] In this process, the processor executes the platform control program for testing low-noise power supplies using waveforms. This platform control program is stored in the memory. The platform control program for testing low-noise power supplies using waveforms implements the method steps for testing low-noise power supplies using waveforms, for example:

[0138] S1. Connect the power supply under test and the voice gateway, and power it on in real time;

[0139] S2. Connect to an environment shielded from external noise via the voice interface of the voice gateway;

[0140] S3. In an environment shielded from external noise, modulate the voice gateway to a periodic state of comfortable noise or dial tone; and play the sound.

[0141] S4. Acquire and process the sound being played, and based on the processed sound and the sound signal waveform, detect the noise level of the power supply under test in real time.

[0142] The specific details of the steps have been explained above and will not be repeated here.

[0143] In this embodiment of the invention, the platform-embedded processor for waveform testing of low-noise power supplies can be composed of integrated circuits. For example, it can be composed of a single-packaged integrated circuit or multiple integrated circuits with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor connects to various components using various interfaces and lines, and executes programs or units stored in memory, as well as calling data stored in memory, to perform various functions of waveform testing of low-noise power supplies and process data.

[0144] The memory is used to store program code and various data. It is installed in the platform that uses waveform testing of low-noise power supplies and enables high-speed, automatic access to programs or data during operation.

[0145] The memory includes read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0146] This invention connects the power supply under test and a voice gateway, and powers them on in real time. The voice gateway is connected to an environment shielded from external noise via its voice interface. Within this environment, the voice gateway is modulated to a periodic state of comfortable noise or dial tone, and the sound is played. The playing sound is acquired and processed, and based on the processed sound and the sound signal waveform, the noise level of the power supply under test is detected in real time. This method can transform uncontrollable human-caused differences into electrical signals that can be measured with an oscilloscope, accurately determining whether the power supply meets the requirements.

[0147] In other words, by using a clean environment, the power frequency noise on the telephone line, which is otherwise unmeasurable, is converted into a differential mode signal that can be measured with an oscilloscope through a physical sound isolation process, thus providing testers with an objective experimental result.

[0148] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for testing a low noise power supply using a waveform, characterized by, The method comprises the steps of: connecting the power supply under test and the voice gateway, and powering in real time; connecting to the outside noise shielding environment through the voice interface of the voice gateway; modulating the voice gateway in the periodic state of comfort noise or dial tone in the outside noise shielding environment; and playing the sound; wherein the periodic state is a signal state that is output in a fixed time interval; acquiring and processing the playing sound, and detecting the noise condition of the power supply under test in real time according to the processed sound and the sound signal waveform.

2. The method of claim 1, wherein the waveform is a square wave. The step of connecting the power supply under test and the voice gateway, and powering in real time, further comprises the steps of: connecting the power supply under test to AC 220V voltage, and outputting DC 12V to the gateway device.

3. The method of claim 1, wherein the waveform is a square wave. The step of connecting to the outside noise shielding environment through the voice interface of the voice gateway further comprises the steps of: acquiring a normal start signal of the voice gateway device; connecting the voice interface of the gateway device to the outside noise shielding environment interface according to the start signal.

4. The method of claim 3, wherein the waveform is a square wave. The outside noise shielding environment interface is an RJ11 interface. The step of connecting the voice interface of the gateway device to the outside noise shielding environment interface specifically comprises connecting the voice interface of the gateway device to the RJ11 interface of the outside noise shielding environment through a set telephone line.

5. The method of claim 1, wherein the waveform is a square wave. The step of modulating the voice gateway in the periodic state of comfort noise or dial tone in the outside noise shielding environment; and playing the sound further comprises the step of: playing the normal voice signal and the power frequency noise through the hands-free approach.

6. The method of claim 1, wherein the waveform is a square wave. The step of acquiring and processing the playing sound, and detecting the noise condition of the power supply under test in real time according to the processed sound and the sound signal waveform further comprises the steps of: acquiring the comfort noise or / and the dial tone; transmitting the detected analog signal, and processing the analog signal in real time.

7. The method of testing a low noise power supply with waveforms of claim 6, wherein, The step of transmitting the detected analog signal, and processing the analog signal in real time further comprises the step of: amplifying the received analog signal, and outputting the analog signal.

8. The method for testing a low-noise power supply with a waveform according to claim 1 or 6, characterized in that, The step of acquiring and processing the playing sound, and detecting the noise condition of the power supply under test in real time according to the processed sound and the sound signal waveform further comprises the step of: acquiring the amplitude data of the dial tone, and determining whether the power supply under test meets the predetermined requirement based on the amplitude data of the dial tone.

9. A system for testing low-noise power supplies using waveforms, characterized in that, The system comprises: a first connection unit for connecting the power supply under test and the voice gateway, and powering in real time; a second connection unit for connecting to the outside noise shielding environment through the voice interface of the voice gateway; a modulation unit for modulating the voice gateway in the periodic state of comfort noise or dial tone in the outside noise shielding environment; and playing the sound; wherein the periodic state is a signal state that is output in a fixed time interval; a noise detection unit for acquiring and processing the playing sound, and detecting the noise condition of the power supply under test in real time according to the processed sound and the sound signal waveform.

10. The system for testing a low noise power supply with waveforms according to claim 9, wherein, The first connection unit further comprises: a first connection module for connecting the power supply under test to AC 220V voltage, and outputting DC 12V to the gateway device; and / or, the second connection unit further comprises: The first acquisition module is used for acquiring a normal start signal of a voice gateway device; The second connection module is used for connecting a voice interface of the gateway device to an external noise shielding environment interface according to the start signal; The external noise shielding environment interface is an RJ11 interface; The voice interface of the gateway device is connected to the external noise shielding environment interface through a telephone line; And / or, the modulation unit further comprises: The playing module is used for playing the normal voice signal and the power frequency noise through a hands-free approach; And / or, the noise detection unit further comprises: The second acquisition module is used for acquiring comfort noise or / and dial tone; The transmission processing module is used for transmitting the detected analog signal and processing the analog signal in real time; The determination module is used for acquiring amplitude data of the dial tone and determining whether the to-be-tested power supply meets predetermined requirements according to the amplitude data of the dial tone; And / or, the transmission processing module further comprises: The amplification output module is used for amplifying the received analog signal and outputting the analog signal.

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