Apparatus and method for measuring noise

• US 10,101,242 B2
• Filed: 06/21/2016
• Issued: 10/16/2018
• Est. Priority Date: 10/20/2015
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), SM Instrument Co., Ltd.
• Inventors: Lim, Kyoung Sil, Lee, Tae-Woong, Kim, Young-Key
• Primary Examiner(s): Kwok, Helen
• Application Number:
  US15/188,647
• Publication Number:
  US 20170108409A1
• Time in Patent Office: 847 Days
• CPC Class Codes: G01H 13/00 Measuring resonant frequency
• CPC Class Codes: G01H 3/08 Analysing frequencies present in complex vibrations, e.g. comparing harmonics present acoustic presence detection G01V1/001
• CPC Class Codes: G01M 17/007 Wheeled or endless-tracked vehicles G01M17/08 takes precedence

Abstract

An apparatus for measuring noise includes: a signal generator configured to input an input signal having an excitation frequency to an audio device; and a controller configured to measure rattle noise from a sound pressure signal generated in response to the input signal. The controller measures the rattle noise by comparing a frequency component of the sound pressure signal with a masking curve corresponding to the excitation frequency.

Claims

1. An apparatus for measuring noise, the apparatus comprising:

a signal generator configured to input an input signal having an excitation frequency to an audio device; and

a controller configured to measure a rattle noise from a sound pressure signal generated in response to the input signal,

wherein the controller measures the rattle noise by comparing a frequency component of the sound pressure signal with a masking curve corresponding to the excitation frequency, and

wherein the controller performs Fourier Transform on the sound pressure signal to confirm the excitation frequency, and measures the rattle noise using a value, among the frequency component of the sound pressure signal, which exceeds the masking curve corresponding to the excitation frequency.

2. The apparatus according to claim 1, wherein the controller compares the masking curve, which indicates a relationship between an audible threshold value and a frequency variation, with the frequency component of the sound pressure signal.

3. The according to claim 1, wherein the signal generator inputs the input signal, in which the excitation frequency is successively changed during a reference period of time, into the audio device.

4. The apparatus according to claim 3, wherein the controller obtains a relationship between the rattle noise and a change of the excitation frequency.

5. The apparatus according to claim 3, wherein the controller confirms a change of the rattle noise during the reference period of time.

6. The apparatus according to claim 1, further comprising:

a microphone configured to obtain the sound pressure signal generated in response to the input signal.

7. The apparatus according to claim 1, further comprising:

a display configured to visually display the measured rattle noise.

8. A method for measuring noise, the method comprising steps of:

inputting, by a signal generator, an input signal, which has an excitation frequency, into an audio device; and

measuring, by a controller, a rattle noise from a sound pressure signal generated in response to the input signal,

wherein the measuring the rattle noise includes;

performing Fourier Transform on the sound pressure signal to confirm the excitation frequency;

obtaining a masking curve corresponding to the excitation frequency; and

measuring the rattle noise by using a value exceeding the obtained masking curve, among frequency components of the sound pressure signal.

9. The method according to claim 8, wherein the step of measuring the rattle noise includes:

comparing the masking curve, which indicates a relationship between an audible threshold value and a frequency variation, with the frequency component of the sound pressure signal.

10. The method according to claim 8, wherein the step of inputting the input signal to the audio device includes:

inputting the input signal, in which the excitation frequency is successively changed during a reference period of time, into the audio device.

11. The method according to claim 10, wherein the step of measuring the rattle noise includes:

obtaining a relationship between the rattle noise and a change of the excitation frequency.

12. The method according to claim 10, wherein the step of measuring the rattle noise includes:

confirming a change of the rattle noise during the reference period of time.

13. The method according to claim 8, further comprising:

obtaining the sound pressure signal generated in response to the input signal.

14. The method according to claim 8, further comprising:

visually displaying the measured rattle noise.