1. Test items
Noise reduction effect test:
Full-band noise reduction capability: In a noise environment with different frequencies, such as low-frequency traffic roar, mid-frequency human voice conversation, and high-frequency machine equipment sharp sound, test the degree of attenuation of noise in each frequency band by the headphones, and use professional acoustic instruments to measure the difference in sound pressure level of ambient noise before and after the headphones turn on noise reduction. The greater the difference, the better the noise reduction effect.
Dynamic noise reduction performance: Simulate the real-time changes in noise intensity and frequency in real scenes, and observe whether the headphones can quickly and accurately adapt and continue to effectively reduce noise. For example, in the case of sudden noise changes when entering and exiting the subway, see whether it can quickly adjust the noise reduction output.
Sound quality test:
Frequency response accuracy: By playing standard audio signals covering different frequencies, use a professional audio analyzer to measure the accuracy of the headphones in restoring sound. Ideally, each frequency should be restored evenly without obvious peaks or troughs, ensuring that the treble is transparent, the midrange is full, and the bass is thick and undistorted.
Distortion test: Input high-intensity audio signals to detect the distortion of the sound when the headphones are played at a high volume. The lower the distortion, the purer the sound quality, avoiding problems such as broken sound and noise that affect the auditory experience.
Wearing comfort test:
Long-term wearing pressure distribution: Use pressure sensors distributed at the contact points between the headband and the earmuffs to simulate the situation after wearing for several hours to check whether the pressure is evenly distributed and whether there are any pain points caused by excessive local pressure.
Breathability evaluation: Wear for a certain period of time in a high temperature and high humidity environment, observe the changes in humidity and temperature in the earmuffs, as well as the user's subjective feelings, to determine whether it is stuffy and ensure good breathability.
Battery life test: In different functional modes, such as only turning on noise reduction, connecting Bluetooth to play music and turning on noise reduction at the same time, test the time from full charge to exhaustion of the headphones to see whether the product's claimed battery life standard is met to ensure daily use needs.
2. Testing method
Noise reduction effect: Place the headphones in an anechoic chamber or a test chamber that simulates a real noise environment, use a high-precision sound level meter to measure the sound pressure level when the noise reduction function is turned on and off, and calculate the noise reduction amount; the dynamic noise reduction test uses a variable frequency noise source to monitor the noise reduction performance of the headphones in real time.
Sound quality: Connect professional audio test equipment, play standard audio files, and analyze the frequency response curve; increase the input signal strength to several times the rated power, and use a distortion meter to measure the distortion.
Wearing comfort: Invite volunteers with different head and ear shapes to wear them, and use a pressure tester to test the pressure of the headband and earmuffs after wearing them; simulate a high temperature and high humidity environment and collect user feedback.
Battery life: After being fully charged, it continues to run in the set mode, and the timer records the working time until it automatically shuts down.
3. Testing standards
Internationally, there are relevant audio equipment standards such as IEC 60959 that involve some indicators of head-mounted noise-cancelling headphones; China has formulated specifications such as GB/T 7313 "Minimum performance requirements for high-fidelity headphones" based on international standards and national conditions, setting benchmarks from multiple aspects such as noise reduction, sound quality, and safety to ensure product quality and consumer rights.
4. Significance of testing
For consumers, testing ensures that they purchase headphones with excellent noise reduction, good sound quality, and comfortable wearing, which improves the user experience and protects hearing. Manufacturers optimize design, material selection, and manufacturing processes based on testing to enhance market competitiveness. From the perspective of market supervision, strict testing regulates the industry, eliminates inferior products, promotes the healthy development of the audio equipment industry, and allows consumers to purchase with confidence.
