1, the amplitude is inaccurate, and the laboratory microphone needs strict calibration. Simply put, the conversion rate of sound waves into electrical signals needs to be confirmed by standard sound.
2. The frequency response characteristics are inaccurate. Sound with different frequencies has different attenuation characteristics after being collected by mobile phone microphone. Attenuation characteristics of laboratory microphones are tested and loaded into test equipment. The frequency response characteristics of each mobile phone microphone are definitely different, and the same test software is definitely indistinguishable.
Mobile phone noise testing software can be used for qualitative comparison. Simply put, two voices can be compared. You can also confirm the frequency components of the sound source, that is, which frequencies are mainly contained in the sound (frequency is the concept of relative time, and the mobile phone processor handles it very accurately).
Extended data:
Environmental noise detection and measurement instruments with accuracy of Class 2 or above are integrated average sound level meters or environmental noise automatic monitoring instruments.
Environmental noise is harmful to people's work and rest. When people are troubled by noise problems, they can first ask the relevant testing institutions with national qualifications to carry out systematic and scientific testing on environmental noise or indoor noise, and after obtaining the legally effective testing report.
If it is found that the noise really exceeds the standard, you can complain to the property management company or the local department that specializes in noise pollution (such as the Ministry of Environmental Protection), and the environmental protection department will deal with the noise that exceeds the standard according to the national environmental protection standards and relevant laws.