KR20050119290A - Sound-level measuring apparatus of electronic machine and method thereof - Google Patents

Abstract

Disclosed are a noise measuring apparatus and a measuring method thereof capable of detecting noise at a specific frequency as well as the magnitude of sound pressure for all frequency bands when measuring noise of an electronic device. The noise measuring device is connected to one or more microphones for converting noise generated from a noise source into a voltage signal, a first noise measuring unit for calculating sound pressure values of all frequency bands according to the voltage signal output from the microphone, and a first noise measuring unit. And a second noise measuring unit calculating a sound pressure value for each frequency according to the voltage signal. According to the present invention, by determining whether the noise level is satisfied by detecting the noise at a specific frequency as well as the sound pressure for all frequency bands when measuring the noise of the electronic device, the noise level is increased and the user's ears are bothered. It is possible to prevent the electronic device from generating a noise at a specific frequency, thereby eliminating potential consumer complaints and increasing the reliability of the electronic device.

Description

Noise measuring device of electronic device and measuring method thereof

The present invention relates to a noise measuring apparatus for measuring the noise of an electronic device such as a DVD player, a camcorder, and the like and a measuring method thereof.

In general, electronic devices are designed to satisfy a certain noise level, for example, 39 dB in the entire frequency band of the DVC drum of the DVD player. Therefore, the electronic device is tested after manufacturing to test whether the designed noise standard is satisfied.

1 shows a general noise measuring apparatus 10 for measuring noise of an electronic device. The noise measuring device 10 is provided adjacent to the measurement object 2 in the anechoic chamber 1 and is a microphone 3 for converting noise generated in the measurement object 2 into a voltage signal, and the voltage output from the microphone (). A microphone preamlifier (4) for amplifying the signal, and a noise level is calculated and displayed based on the voltage signal output from the microphone (3), which is connected to the microphone (3) via a connecting line (8) outside the anechoic chamber (1). And a noise measuring unit (5).

As shown in FIG. 2, the noise measuring unit 5 includes a noise detector 7 for calculating the noise level based on the voltage signal, and a display unit 6 for displaying the noise level calculated by the noise detector 7. .

The noise detection unit 7 is composed of a noise detection circuit 9 that calculates sound pressure values of all frequency bands based on the voltage signal amplified by the microphone preamplifier 4. The noise detection circuit 9 detects the root mean square (RMS) value of the input voltage signal, calculates the sound pressure value of the entire frequency band, and calculates the calculated sound pressure value in an appropriate unit, for example, in dB unit. Is made of.

Briefly referring to the operation of the noise measuring device 10, the noise generated in the measurement object 2 in the anechoic chamber 1 is input to the microphone 3 and converted into a voltage signal according to the sound pressure, and then the microphone preamplifier 4 Is amplified. The voltage signal amplified by the microphone preamplifier 4 is calculated by the noise detection circuit 9 as a sound pressure value of the entire frequency band, and then converted into dB, and displayed by the depressor 6.

However, since the conventional noise measuring apparatus 10 determines the noise level of the measurement object 2 as the magnitude of the sound pressure for the entire frequency band, there is a problem in that the noise generated at a specific frequency cannot be discerned.

The noise generated at a certain frequency not only increases the size of the noise, but also generates noise that is annoying to the user's ear, which may be a cause for dissatisfaction of the consumer or a deterioration of the reliability of the electronic device.

Therefore, by detecting the presence of noise generated at a specific frequency as well as the magnitude of the sound pressure for the entire frequency band, to test whether the electronic device satisfies the designed noise standard, and accordingly the need for a noise measuring device that can detect whether there is a product defect This is increasing.

The present invention has been made to solve the problems described above, an object of the present invention is to measure the noise of the electronic device as well as the sound pressure for the entire frequency band noise measurement device that can detect the noise at a specific frequency and The measurement method is provided.

In order to achieve the above object, the present invention is a noise measuring device including at least one microphone for converting the noise generated from the noise source into a voltage signal, the sound pressure value of at least all frequency bands in accordance with the voltage signal output from the microphone To provide a noise measuring device for an electronic device comprising a first noise measuring unit, and a second noise measuring unit connected to the first noise measuring unit and calculating a sound pressure value for each frequency at least in accordance with the voltage signal.

In a preferred embodiment, the first noise measuring unit analyzes the voltage signal output from the microphone in all frequency bands and calculates a sound pressure value of at least all frequency bands, and at least, calculated in the first noise detection unit. And a first display unit configured to externally display sound pressure values of all frequency bands.

Optionally, the first noise measuring unit may further include a first warning unit that warns the outside when the sound pressure value of the entire frequency band calculated by the first noise detector does not satisfy a predetermined criterion. The first warning unit may be configured as a first speaker that emits a warning sound to the outside or a first lamp that emits light to the outside.

The second noise measuring unit may include: a second noise detector configured to analyze the voltage signal for each frequency and calculate at least frequency sound pressure values; and at least, a second display unit configured to externally display sound pressure values for each frequency calculated by the second noise detector. Include.

Optionally, the second noise measuring unit may further include a second warning unit that warns the outside when at least one of sound pressure values for each frequency calculated by the second noise detection unit does not satisfy a predetermined criterion. The second warning unit may be configured as a second speaker for generating a warning sound externally or a second lamp for emitting light to the outside.

According to another embodiment of the present invention, the present invention comprises the steps of converting the noise generated from the noise source into a voltage signal, calculating at least the sound pressure value of all frequency bands according to the voltage signal, at least calculated sound pressure value of the entire frequency band The present invention provides a noise measuring method of an electronic device, the method comprising: displaying externally, calculating at least frequency-specific sound pressure values according to voltage signals, and displaying at least the calculated frequency-specific sound pressure values externally.

Optionally, the noise measuring method of the present invention determines whether the calculated sound pressure values of all the frequency bands satisfy the predetermined criteria, and when the calculated sound pressure values of the all frequency bands do not satisfy the predetermined criteria, The method may further include a warning step.

In addition, the noise measuring method of the present invention is to determine whether the calculated sound pressure value for each frequency satisfies the predetermined criteria, and to warn the outside when at least one of the calculated sound pressure value for each frequency does not meet the predetermined criteria It may further comprise a step.

According to still another embodiment of the present invention, the present invention provides a noise measuring apparatus including one or more microphones for converting noise generated from a noise source into a voltage signal, the sound pressure value of at least all frequency bands according to the voltage signal output from the microphone. The present invention provides a noise measuring apparatus for an electronic device including a noise measuring unit for calculating a sound pressure value for each frequency.

In a preferred embodiment, the noise measuring unit is a first noise measuring unit for calculating a sound pressure value of at least all frequency bands in accordance with the voltage signal output from the microphone, at least a frequency-specific sound pressure value in accordance with the voltage signal output from the microphone And a display unit configured to externally display sound pressure values of all frequency bands and sound pressure values for each frequency calculated at least by the first and second noise measurement units.

Optionally, the noise measuring unit further includes a warning unit that warns the outside when at least one of the sound pressure value of the entire frequency band and the sound pressure value for each frequency calculated by the first and second noise detectors does not meet the predetermined criteria. can do. The warning unit may be configured as a speaker for generating a warning sound to the outside or a lamp for emitting light to the outside.

According to another embodiment of the present invention, the present invention comprises the steps of converting the noise generated from the noise source into a voltage signal, calculating at least the sound pressure value of the entire frequency band and the sound pressure value for each frequency according to the voltage signal, and at least calculated It provides a noise measuring method of an electronic device comprising the step of displaying the sound pressure value of each frequency band and the sound pressure value for each frequency to the outside.

Optionally, the noise measuring method of the present invention includes determining whether the calculated sound pressure value of the entire frequency band and the sound pressure value for each frequency satisfy a predetermined criterion, and at least one of the calculated sound pressure value for the all frequency band and the frequency sound pressure value. It may further comprise a step of warning to the outside when one does not meet the predetermined criteria.

Hereinafter, the noise measuring apparatus and the measuring method according to the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)

3 schematically shows a noise measuring apparatus 100 according to a first embodiment of the present invention.

The noise measuring apparatus 100 of the first embodiment includes a microphone 13 for converting noise generated from a measurement target to measure noise, for example, noise generated from a DVD drum (not shown) of the DVD player 2 ', into a voltage signal, The microphone preamplifier 14 (FIG. 4), which is connected to the microphone 13 through the connecting line 8 and amplifies the voltage signal output from the microphone 13, according to the voltage signal amplified by the microphone preamplifier 14 A first noise measurement unit 15 that calculates sound pressure values of all frequency bands, and a first noise measurement unit 15 connected to the first noise measurement unit 15 through a connecting line 8 'and from the microphone 13 The second noise measuring unit 30 for calculating the sound pressure value for each frequency of the noise in accordance with the voltage signal input through.

Noise measurement of an electronic device such as a DVD player 2 'is usually performed in the anechoic chamber 1 which constitutes a shielded space so that external noise does not enter, and for this purpose, the DVC drum of the DVD player 2' 1) It is installed in a proper place and connected to a power supply (not shown).

The microphone 13 is disposed in the anechoic chamber 1 with a predetermined distance from the DVD player 2 'so as to measure the noise generated from the DVC drum of the DVD player 2'.

As shown in detail in FIG. 4, the first noise measuring unit 15 analyzes the voltage signal output from the microphone 13 in all frequency bands and calculates a sound pressure value in all frequency bands of the noise. 17) a first control unit 20 for controlling the overall operation of the first noise measuring unit 15 and generating a control signal for displaying the sound pressure value calculated by the first noise detection unit 17, and the first control unit 20 A first display unit 16 for displaying the sound pressure value of the entire frequency band of the noise calculated by the first noise detection unit 17 according to the control signal of the external).

The first noise detection unit 17 is composed of a noise detection circuit for calculating sound pressure values of all frequency bands based on the voltage signal amplified by the microphone 13. Like the conventional noise detector 7 shown in FIG. 2, the noise detection circuit detects the RMS value of the input voltage signal, calculates the sound pressure value of the entire frequency band, and converts the calculated sound pressure value into an appropriate unit, for example, dB. The RMS detector 19 converted into units may be provided.

The first display unit 16 displays sound pressure values of all frequency bands calculated by the noise detection circuit of the first noise detector 17 according to the control signal of the first controller 20.

Therefore, during the noise measurement, the measurement operator visually checks whether the noise standard of the DVC drum of the DVD player 2 ', which is to be measured, is satisfied by the sound pressure value of the entire frequency band displayed on the first display unit 16, for example, 39 dB. It is determined whether or not the DVC drum of the DVD player 2 is defective depending on whether the noise standard is satisfied.

Optionally, the first noise measuring unit 15 stores a predetermined first determination reference value of sound pressure values of all frequency bands, that is, 39 dB in the case of a DVC drum, and then calculates all frequencies calculated by the first noise detection unit 17. The DVC drum of the DVD player 2 'does not satisfy the noise standard when the sound pressure value of all the frequency bands calculated by the first noise detector 17 is greater than or equal to the determination reference value by comparing the sound pressure value of the band with the stored first determination reference value. It may also be configured to warn the outside of an abnormal condition.

To this end, the first noise measurement unit 15, as shown in Figure 4, the first memory 23 for storing the first predetermined reference value of the sound pressure value of the entire frequency band, and the first noise detection unit 17 DVC drum of the DVD player 2 'satisfies the noise standard according to the control signal of the first control unit 20 when the sound pressure value of all the frequency bands calculated in the above) is equal to or greater than the first determination reference value stored in the first memory 23. It may further include a first warning unit 25 to warn the outside not to. The first warning unit 25 is configured of a first speaker (not shown) that generates a warning sound of a specific type on the outside or a first lamp (not shown) that emits light of a specific type on the outside.

In this case, during the noise measurement, the measurement operator wants to measure the warning sound of the first speaker or the blinking of the first lamp without the hassle of visually checking the sound pressure value of all frequency bands displayed on the first display unit 16. It is possible to determine whether the DVC drum of the DVD player 2 'satisfies the noise standard (39 dB), and whether the DVC drum of the DVD player 2' is defective or not.

As such, the first noise measuring unit 15 measures and displays sound pressure values of all frequency bands of the noise so that an operator can determine whether the DVC drum of the DVD player 2 'is defective.

The second noise measuring unit 30 outputs from the microphone 13 to analyze the voltage signal input through the first noise measuring unit 15 for each frequency to calculate a sound pressure value of each frequency of the noise ( 31) a second control unit 33 for controlling the second noise detection unit 31 and generating a control signal for displaying the sound pressure value calculated by the second noise detection unit 31, and a control signal of the second control unit 33. In accordance with the second noise detection unit 31 includes a second display unit 36 for displaying the sound pressure value of each frequency and the corresponding noise evaluation curve to the outside.

The second noise detector 31 may be configured as a frequency analysis circuit such as a fast fourier transform (FFT) analysis circuit. The frequency analysis circuit is connected to the output terminal of the first control unit 20, and analyzes the voltage signal output from the microphone 13 for each frequency to calculate the sound pressure value for each frequency, mapping the corresponding noise evaluation curve (mapping) )do.

As shown in FIG. 5, the second display unit 36 displays a noise evaluation curve indicating a sound pressure value of each frequency of noise and a corresponding sound pressure level according to the control signal of the second controller 33.

Therefore, in the noise measurement, the measurement worker is connected to the DVC drum of the DVD player 2 'to be measured at a specific frequency by the sound pressure value of each frequency displayed on the second display unit 36 and the corresponding noise evaluation curve. It is possible to visually determine whether this occurs, and whether or not the DVC drum of the DVD player 2 'is defective can be judged according to whether a noise is generated.

Optionally, the second noise measuring unit 30 stores a predetermined second judgment reference value of the sound pressure value of each frequency, for example, 15 dB in the case of a DVC drum, and then stores each of the frequencies calculated by the second noise detector 31. And comparing the sound pressure value with the stored second determination reference value to warn the outside that at least one of the sound pressure values of each frequency calculated by the second noise detector 31 is an abnormal state in which a frequency noise is generated when the sound pressure value is higher than the second determination reference value. It may be.

To this end, the second noise measuring unit 30 includes a second memory 38 for storing a predetermined second determination reference value of the sound pressure value of the frequency, and a sound pressure value of each frequency calculated by the second noise detector 31. The electronic device further includes a second warning unit 39 that warns the occurrence of the frequency noise to the outside according to the control signal of the second control unit 33 when at least one of the second determination reference values is greater than or equal to the second determination reference value. The second warning unit 39 is a second speaker (not shown) that generates a specific type of warning sound externally the same as or similar to the first speaker, or an external device that emits light of a specific type identical or similar to the first lamp to the outside. It may consist of two lamps (not shown).

In this case, during the noise measurement, the measurement operator wants to measure the warning sound of the second speaker or the blinking of the second lamp without the hassle of visually checking the sound pressure value of each frequency displayed on the second display unit 36. It is determined whether the DVC drum of the DVD player 2 'generates a frequency noise at a specific frequency, for example, the frequency (12137.5 Hz) shown in FIG. 5, and the DVC drum of the DVD player 2' according to whether or not the noise is generated. It is possible to determine whether or not.

As such, the second noise measuring unit 30 measures and displays sound pressure values for each frequency of noise, so that an operator can determine whether a frequency noise is generated to determine whether the DVC drum of the DVD player 2 'is defective. To be.

As described above, the noise measuring apparatus 100 according to the first embodiment of the present invention measures the sound pressure value of each frequency as well as the sound pressure value of the entire frequency band of the DVC drum of the DVD player 2 '. And / or a warning, so that the measurement operator can determine whether the noise standard of the DVC drum of the DVD player 2 'is satisfied based on not only the magnitude of the sound pressure value of the entire frequency band but also the occurrence of the frequency noise. .

In the above, the noise measuring apparatus 100 of the first embodiment of the present invention has been illustrated and described as measuring the noise of the DVC drum of the DVD player 2 ', but the present invention is not limited to this, and the same principle and configuration It may be applied to noise measurement of other parts, for example, an entire DVD player, an entire camcorder, and a head drum of a camcorder.

The noise measuring method of the noise preventing device 100 according to the first embodiment of the present invention configured as described above will be described in detail with reference to FIGS. 3 and 6.

First, the noise source to be measured, for example, the DVC drum of the DVD player 2 'or the DVD player 2' is installed to operate in the anechoic chamber 1, and the microphone 13 is installed in the DVD player 2 '. After the DVC drum is installed to be spaced apart from the predetermined distance, the power is applied to the DVC drum to operate the DVC drum (S1).

As the DVC drum operates, the microphone 13 converts the noise generated from the DVC drum into a voltage signal according to sound pressure and outputs the converted voltage signal to the microphone amplifier 14 (S2).

The microphone amplifier 14 amplifies the voltage signal output from the microphone 13 and outputs it to the first noise detection unit 17 of the first noise measurement unit 15.

The first noise detector 17 calculates the amplified voltage signal as a sound pressure value of all frequency bands, converts the amplified voltage signal into a corresponding dB value, and outputs the same to the first controller 20 (S3).

The first control unit 20 displays the sound pressure values of all frequency bands converted into dB values to the outside through the first display unit 16 (S4). At this time, the measurement operator judges whether the DVC drum of the DVD player 2 'satisfies the noise standard (39 dB) by looking at the sound pressure value of the entire frequency band displayed through the first display unit 16, and accordingly the DVD player It is possible to determine whether or not the DVC drum of (2) is defective.

Here, when the first noise measuring unit 15 is configured to further include a first warning unit 25, the first control unit 20 has a sound pressure value of all frequency bands calculated as shown in FIG. In operation S5, it is further determined whether the sound pressure value of the entire frequency band calculated by comparing the first predetermined reference value stored in the memory 23, for example, 39 dB or more, is 39 dB or more.

As a result of the determination in step S5, when the calculated sound pressure value of the entire frequency band is 39dB or more, the first control unit 20 may determine that the operator is an abnormal state that the DVC drum of the DVD player 2 'does not meet the noise standard. Warn to the outside through the first speaker or the first lamp of the first warning unit 25 (S6). At this time, the measurement operator of the DVC of the DVD player (2 ') through the warning sound of the first speaker or the flashing of the first lamp without the hassle of checking the sound pressure value of the entire frequency band displayed through the first display unit 16 It may be determined whether the drum satisfies the noise standard (39 dB), and accordingly, it may be determined whether the DVC drum of the DVD player 2 'is defective.

As a result of the determination in step S5, when the calculated sound pressure value of the entire frequency band is 39 dB or less, the first controller 20 outputs the voltage signal output from the microphone amplifier 14 to the frequency analysis circuit of the second noise detector 31. The frequency analysis circuit analyzes the voltage signal output from the first control unit 20 for each frequency, calculates sound pressure values for each frequency, maps a noise evaluation curve indicating a corresponding sound pressure level, and then performs a second control unit ( 33) (S7).

The second control unit 33 outputs a control signal to the second display unit 36 to display the sound pressure value of each frequency output from the frequency analysis circuit and the corresponding noise evaluation curve through the second display unit 36. By displaying the sound pressure value for each frequency and the corresponding noise evaluation curve (S8). At this time, the measurement operator looks at the sound pressure value and noise evaluation curve of each frequency displayed through the second display unit 36 to determine whether a noise occurs at a specific frequency, for example, 12137.5 Hz, and accordingly the DVD player 2 '. It is possible to determine whether the DVC drum is defective.

Here, when the second noise measuring unit 30 is configured to further include a second warning unit 39, the second control unit 33 performs the step S8 and at the same time calculated for each frequency as shown in FIG. It is determined whether the sound pressure value of each frequency is greater than or equal to 15 dB by comparing the sound pressure value of the predetermined second judgment reference value stored in the second memory 38, for example, 15 dB (S9).

As a result of the determination in step S9, when the sound pressure of a specific frequency, for example, 12137.5 Hz, of the calculated sound pressure values of each frequency is 15 dB or more, the second control unit 33 determines that the operator has generated a noise at 12137.5 Hz to determine the DVD player ( 2 ') warns the abnormal state to the outside through the second speaker or the second lamp of the second warning part 39 so as to determine that the DVC drum is in a bad state (S6).

As a result of the determination in step S9, when the calculated sound pressure values of each frequency are all 15 dB or less, the second control unit 33 determines that the measurement operator has no noise at each frequency, so that the DVC drum of the DVD player 2 'is in a normal state. In the abnormal state through the second speaker or the second lamp of the second warning unit 39 to generate a warning sound or other forms of warning sound or light to inform the outside (S10).

Thereafter, the measurement operator passes or rejects the DVC drum of the DVD player 2 'according to the measured result, and continues the noise measurement of the DVC drum of the other DVD player 2' or ends the work.

Second Embodiment

7 shows a noise measuring apparatus 100 'according to a second embodiment of the present invention.

The noise measuring apparatus 100 'of the second embodiment is a microphone for converting noise generated from an object to be measured, for example, a DVD drum (not shown), which is a noise source of the DVD player 2', into a voltage signal ( 13), the microphone preamplifier 14 for amplifying the voltage signal output from the microphone 13, and the sound pressure value of the entire frequency band of the noise and the sound pressure value of each frequency in accordance with the voltage signal amplified by the microphone preamplifier 14 It includes a noise measuring unit (15 ') for calculating the.

The noise measuring unit 15 ′ analyzes the voltage signal output from the microphone preamplifier 14 in all frequency bands to calculate sound pressure values in all frequency bands of the noise and the microphone preamplifier 14. Control the overall operation of the noise detection unit 40, the noise measurement unit 15 'consisting of a second noise detector 43 for calculating the sound pressure value of each frequency of noise by analyzing the voltage signal output from Control unit 45 for generating a control signal for displaying sound pressure values calculated by the first and second noise detectors 41 and 43, and sound pressure values calculated by the first and second noise detectors 41 and 43 to the outside. The display unit 46 is provided.

The first noise detector 41 includes a noise detector that calculates sound pressure values of all frequency bands based on the voltage signal amplified by the microphone amplifier 14. Like the conventional noise detector 7 shown in FIG. 2, the noise detection circuit detects the RMS value of the input voltage signal, calculates the sound pressure value of the entire frequency band, and converts the calculated sound pressure value into an appropriate unit, for example, dB. An RMS detector (not shown) converted into units may be provided.

The second noise detector 43 is composed of a frequency analysis circuit such as an FFT analysis circuit. The frequency analysis circuit analyzes the voltage signal output from the microphone amplifier 14 for each frequency, calculates a sound pressure value of each frequency of noise, and maps a corresponding noise evaluation curve.

The display unit 46 displays a noise evaluation curve indicating a sound pressure value of the entire frequency band of the noise, a sound pressure value of each frequency, and a corresponding sound pressure level according to the control signal of the controller 45.

Therefore, in the noise measurement, the measurement operator of the DVC drum of the DVD player 2 'to be measured by the sound pressure value of the entire frequency band displayed on the display unit 46, the sound pressure value of each frequency and the corresponding noise evaluation curve It is visually determined whether this noise standard is satisfied, for example 39 dB, and whether a noise occurs at a specific frequency, for example, 12137.5 Hz shown in FIG. It is determined whether the DVC drum of ') is defective.

Optionally, the noise measuring unit 15 'stores a predetermined first judgment reference value of sound pressure values of all frequency bands and a predetermined second judgment reference value of sound pressure values of each frequency, for example, 39 dB and 15 dB for a DVC drum. (A) comparing the sound pressure values of the entire frequency bands and the sound pressure values of the respective frequencies calculated by the first and second noise detectors 41 and 43 with the stored first and second determination reference values. 41, 43) may be configured to warn the outside that at least one of the sound pressure values calculated in the abnormal state is at least one of the first and second determination reference value.

To this end, the noise measuring unit 15 'stores a predetermined first judgment reference value of sound pressure values of all frequency bands and a second predetermined judgment reference value of sound pressure values of each frequency, that is, a memory storing 39 dB and 15 dB in the case of a DVC drum. (48) and when at least one of the sound pressure value of the entire frequency band and the sound pressure value of each frequency calculated by the first and second noise detectors 41 and 43, respectively, is greater than or equal to the predetermined first and second reference values; It may further include a warning unit 49 to warn. The warning unit 49 may be configured of a speaker (not shown) that generates a warning sound externally or a lamp (not shown) that emits light to the outside.

In this case, at the time of noise measurement, the measurement operator measures the sound pressure value of all frequency bands displayed on the display unit 46 and the sound pressure value of each frequency, without the hassle of visually checking the sound pressure, by the warning sound of the speaker or the blinking of the lamp. It is possible to determine whether the DVC drum of the DVD player 2 'to be satisfied with the noise standard (i.e. 39 dB) and whether a noise occurs at a specific frequency, and determine whether the DVC drum of the DVD player 2' is defective.

In this way, the noise measuring unit 15 'measures and displays the sound pressure value of the entire frequency band of the noise and the sound pressure value of each frequency so that the measurement operator can determine whether the DVC drum of the DVD player 2' is defective. do.

7 and 8 will now be described in detail with reference to FIG. 7 and FIG. 8 for a noise measuring method of the noise suppression apparatus 100 ′ according to the second embodiment of the present invention.

First, a noise source to be measured, for example, a DVD player 2 ', or a DVC drum of the DVD player 2' is installed to operate in the anechoic chamber 1, and the microphone 13 is installed on the DVD player 2 '. After the DVC drum is installed to be spaced apart from the predetermined distance, the DVC drum is operated by applying power to the DVC drum as in the noise measuring method of the noise suppression apparatus 100 of the first embodiment (S10).

As the DVC drum operates, the microphone 13 converts the noise generated from the DVC drum into a voltage signal according to sound pressure and outputs the converted voltage signal to the microphone amplifier 14 (S20).

The microphone amplifier 14 amplifies the voltage signal output from the microphone 13 and outputs it to the first and second noise detectors 41 and 43 of the noise measuring unit 15 '.

The first noise detector 41 calculates the amplified voltage signal as a sound pressure value of the entire frequency band, converts it into a corresponding dB value, and outputs the converted noise to the controller 45. The second noise measurer 43 amplifies the amplified voltage. Analyze the signal for each frequency to calculate the sound pressure value of each frequency, and then map the noise evaluation curve corresponding to the output to the control unit 45 (S30).

The controller 45 displays the sound pressure value of the entire frequency band converted to the dB value, the sound pressure value of each frequency, and the corresponding noise evaluation curve through the display unit 46 (S40). At this time, the measurement operator views the sound pressure value of the entire frequency band displayed by the display unit 46, the sound pressure value of each frequency, and the corresponding noise evaluation curve, so that the DVC drum of the DVD player 2 'has a noise standard (39 dB). ), And whether a noise occurs at a specific frequency, for example, 12137.5 Hz shown in FIG. 3, and determines whether the DVC drum of the DVD player 2 'is defective.

Here, when the noise measuring unit 15 'is configured to further include a warning unit 49, the control unit 45 is the sound pressure of the entire frequency band calculated by the first noise detection unit 41 as shown in FIG. The value is determined to be greater than or equal to 39 dB by comparing the value with the predetermined first determination reference value stored in the memory 48, that is, 39 dB (S50).

As a result of the determination in step S50, when the sound pressure value of the entire frequency band calculated by the first noise detector 41 is 39 dB or more, the controller 45 determines that the measurement operator does not satisfy the noise standard of the DVC drum of the DVD player 2 ′. Warn to the outside through the speaker or lamp of the warning unit 49 to determine that the abnormal state (S60). At this time, the measurement operator determines that the DVC drum of the DVD player 2 'is in a bad state by the warning sound of the speaker or the flickering of the lamp without the hassle of checking the sound pressure value of all frequency bands displayed through the display unit 46. can do.

As a result of the determination in step S50, when the sound pressure value of the entire frequency band calculated by the first noise detector 41 is 39 dB or less, the controller 45 stores the sound pressure value of each frequency calculated by the second noise detector 43. In operation S70, it is determined whether the predetermined second determination reference value stored in 48), that is, 15 dB or more, is compared with 15 dB.

As a result of the determination in step S70, when at least one of the sound pressure values of each frequency calculated by the second noise detector 43 is 15 dB or more, the control unit 45 determines that the DVC drum of the DVD player 2 ' For example, 12137.5 Hz) to warn the outside through the speaker or lamp of the warning unit 49 so that it can determine that the abnormal state occurs (S60). At this time, the measurement operator judges that the DVC drum of the DVD player 2 'is in a bad state through the warning sound of the speaker or the blinking of the lamp without the hassle of checking the sound pressure value of each frequency displayed through the display unit 46. can do.

As a result of the determination in step S70, when the sound pressure values of each frequency calculated by the second noise detector 43 are all 15 dB or less, the control unit 45 determines that the measurement operator is free of noise at each frequency, and thus the DVD player 2 '. In order to determine that the DVC drum is in a normal state through a speaker or lamp to generate an alarm sound or light and other forms of warning sound or light in an abnormal state (S80). At this time, the measurement operator determines that the DVC drum of the DVD player 2 'is in a normal state through the warning sound of the speaker or the flickering of the lamp without the hassle of checking the sound pressure value of each frequency displayed through the display unit 46. can do.

Thereafter, the measurement operator passes or rejects the DVC drum of the DVD player 2 'according to the measured result, and continues the noise measurement of the DVC drum of the other DVD player 2' or ends the work.

As described above, the noise measuring apparatus and method of the electronic device of the present invention detects the noise at a specific frequency as well as the magnitude of sound pressure for all frequency bands when measuring the noise of the electronic device, and satisfies the noise standard. By determining whether the electronic device is defective by determining whether the electronic device is defective, it is possible to prevent the electronic device from generating a noise at a specific frequency that increases the noise level and disturbs the user's ear, thereby reducing potential complaints of consumers. Remove and increase the reliability of the electronics.

In the above, certain preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and any person having ordinary skill in the art to which the present invention pertains without departing from the spirit and spirit of the present invention as claimed in the claims may have various modifications and Modifications may be made.

1 is a schematic diagram of a conventional noise measuring apparatus.

2 is a block diagram illustrating a detailed configuration of the noise measuring apparatus of FIG.

3 is a schematic diagram of a noise measuring apparatus according to a first preferred embodiment of the present invention;

4 is a block diagram illustrating a detailed configuration of the noise measuring apparatus shown in FIG.

FIG. 5 is a graph illustrating an example of a sound pressure value for each frequency of the DVC drum displayed on the second display unit of the second noise measuring unit of the noise measuring apparatus shown in FIG. 3 and a corresponding noise evaluation curve; FIG.

FIG. 6 is a flow chart illustrating a noise measuring process of the noise measuring apparatus shown in FIG.

Fig. 7 is a block diagram illustrating the detailed configuration of the noise measuring apparatus according to the second preferred embodiment of the present invention.

FIG. 8 is a flow chart illustrating a noise measuring process of the noise measuring apparatus shown in FIG.

* Description of the symbols for the main parts of the drawings *

1: anechoic room 2 ': DVD player

3, 13: microphone 4, 14: microphone amplifier

5, 15, 15 ', 30: Noise measuring unit 6, 16, 36, 46: Display unit

7, 17, 31, 42, 43: noise detection unit 9: noise detection circuit

10, 100, 100 ': noise detector 20, 33, 45: control unit

23, 38, 48: memory 25, 39, 49: warning

Claims (16)

In the noise measuring device comprising one or more microphones for converting the noise generated from the noise source into a voltage signal, A first noise measuring unit calculating a sound pressure value of at least all frequency bands according to the voltage signal output from the microphone; And And a second noise measuring unit connected to the first noise measuring unit and calculating at least frequency sound pressure values according to voltage signals. The method of claim 1, wherein the first noise measuring unit, A first noise detector which analyzes the voltage signal output from the microphone in all frequency bands and calculates at least a sound pressure value in all the frequency bands; And At least, the noise measuring device of the electronic device, characterized in that it comprises a first display unit for displaying the sound pressure value of the entire frequency band calculated by the first noise detector to the outside. 3. The apparatus of claim 2, wherein the first noise measuring unit further includes a first warning unit configured to warn the outside when the sound pressure values of all the frequency bands calculated by the first noise detector do not satisfy a predetermined criterion. Noise measuring apparatus for electronic equipment. The noise measuring apparatus of claim 3, wherein the first warning unit comprises at least one of a first speaker for generating a warning sound on the outside and a first lamp for emitting light on the outside. The method of claim 2, wherein the second noise measuring unit, A second noise detector analyzing the voltage signal for each frequency and calculating at least the sound pressure value for each frequency; And At least, the noise measuring device of the electronic device, characterized in that it comprises a second display unit for displaying the sound pressure value for each frequency calculated by the second noise detector to the outside. The method of claim 5, wherein the second noise measuring unit further comprises a second warning unit for warning the outside when at least one of the sound pressure value for each frequency calculated by the second noise detector does not meet a predetermined criterion. Noise measuring device of the electronic device, characterized in that. The noise measuring apparatus of claim 6, wherein the second warning unit comprises at least one of a second speaker for generating a warning sound on the outside and a second lamp for emitting light on the outside. Converting the noise generated from the noise source into a voltage signal; Calculating sound pressure values of at least all frequency bands according to the voltage signal; Displaying at least externally calculated sound pressure values of the entire frequency band; Calculating a sound pressure value of at least frequency according to the voltage signal; And And displaying at least the calculated sound pressure value for each frequency to the outside. The method of claim 8, Determining whether the calculated sound pressure values of all frequency bands satisfy a predetermined criterion; And And warning the outside when the calculated sound pressure value of the entire frequency band does not satisfy the predetermined criterion. The method of claim 9, Determining whether the calculated sound pressure value for each frequency satisfies a predetermined criterion; And And warning the outside when at least one of the calculated sound pressure values for each frequency does not satisfy a predetermined criterion. In the noise measuring device comprising one or more microphones for converting the noise generated from the noise source into a voltage signal, And a noise measuring unit for calculating a sound pressure value of at least all frequency bands and a sound pressure value for each frequency in accordance with the voltage signal output from the microphone. The method of claim 11, wherein the noise measuring unit, A first noise measuring unit calculating a sound pressure value of at least the entire frequency band according to the voltage signal output from the microphone; A second noise measuring unit calculating at least the sound pressure value for each frequency according to the voltage signal output from the microphone; And At least, the noise measuring device of the electronic device, characterized in that it comprises a display unit for displaying the sound pressure value of the entire frequency band and the sound pressure value for each frequency calculated by the first and second noise measuring unit to the outside. The method of claim 12, wherein the noise measuring unit is external when at least one of the sound pressure value of the full frequency band and the sound pressure value for each frequency calculated by the first and second noise detectors respectively do not satisfy a predetermined criterion. Noise measuring device of the electronic device, characterized in that it further comprises a warning to warn. The noise measuring apparatus of claim 13, wherein the warning unit comprises at least one of a speaker for generating an external warning sound and a lamp for emitting light to the outside. Converting the noise generated from the noise source into a voltage signal; Calculating sound pressure values of at least all frequency bands and sound pressure values of frequencies according to the voltage signal; And At least, the noise measurement method of the electronic device characterized in that it comprises the step of displaying the calculated sound pressure value of the entire frequency band and the sound pressure value for each frequency to the outside. The method of claim 15, Determining whether the calculated sound pressure value of the entire frequency band and the sound pressure value for each frequency satisfy a predetermined criterion; And And warning the outside when at least one of the calculated sound pressure values of the entire frequency band and sound pressure values for each frequency does not satisfy a predetermined criterion.