Comparison of the principles and effects of wired headphones noise reduction technology
Publish Time: 2024-11-26
Wired headphones noise reduction technology is mainly divided into two categories: active noise reduction (ANC) and passive noise reduction (PNC). There are significant differences between these two technologies in the principles and application effects of noise reduction.
Active noise reduction technology works through a built-in microphone and an electronic circuit. The microphone is responsible for capturing noise signals in the surrounding environment, and the noise reduction circuit analyzes the spectrum and characteristics of these noises. Based on the analysis results, the headphones generate anti-phase sound waves that are opposite to the phase of the noise sound waves and play them out through the speakers. These anti-phase sound waves cancel each other out when they meet the noise sound waves, thereby reducing the input of noise. Active noise reduction technology is particularly suitable for eliminating low-frequency continuous noise, such as aircraft engine sound or subway noise. Its advantage is that it can provide significant noise reduction effect, protect hearing, and reduce the damage to the ears caused by high volume. However, this technology may affect the sound quality, resulting in a slight decrease in music resolution, and the cost and technical complexity are high.
In contrast, passive noise reduction technology mainly relies on physical sound insulation measures. This headphone design usually includes closed earmuffs and high-density sound insulation materials such as silicone earplugs or foam. They achieve noise reduction by physically surrounding the ears and blocking noise. Passive noise reduction headphones have a more obvious effect on isolating high-frequency noise (such as human voices and keyboard tapping), but have limited effect on low-frequency noise. In addition, wearing for a long time may cause ear discomfort. However, the advantage of passive noise reduction technology is that it does not require electronic components and is relatively inexpensive.
In terms of effect comparison, active noise reduction technology performs well in eliminating low-frequency noise, while passive noise reduction has an advantage in isolating high-frequency noise. Which technology to choose depends on the user's specific needs and usage scenarios. For example, in a noisy public transportation environment, active noise reduction headphones may be more suitable; while in situations where you need to hear external sounds (such as when crossing the road), passive noise reduction headphones may be safer.
In short, understanding the principles and effect comparison of wired headphones noise reduction technology will help users choose the most suitable headphones according to their own needs and enjoy a better listening experience.
