Noise, often referred to as unwanted sound, is a disturbance that can cause discomfort to both humans and the natural environment. It is defined as any sound that interferes with a person’s ability to work, study, or rest. The perception of noise varies from individual to individual, influenced by personal feelings, habits, and surroundings, which makes noise sometimes a subjective experience. In general, noise is considered as environmental sounds that disrupt conversation or concentration.
**Definition of Noise-Canceling Headphones**
Noise-canceling headphones are a type of audio device designed to reduce or eliminate background noise. There are currently two main types: active noise-canceling (ANC) headphones and passive noise-canceling headphones.
Active noise-canceling technology works by using microphones to detect external sounds, then generating an opposite sound wave to cancel out the noise. This process creates a more peaceful listening environment. On the other hand, passive noise-canceling headphones rely on physical barriers such as ear cups filled with foam or materials like silicone to block out sound.
**The Difference Between Active and Passive Noise Reduction Headphones**
Passive noise reduction (seismic noise reduction)
Passive noise reduction relies on the design of the ear cup and the use of soft materials to create a seal around the ear, blocking out external sounds. However, if there is any gap between the ear and the ear cup, the effectiveness of noise reduction decreases significantly. In contrast, active noise-canceling headphones use an internal chip and microphones to detect ambient noise and produce a counter-wave that cancels it out in real time.
From a cost perspective, passive noise-canceling headphones are generally more affordable, ranging from tens to a couple of hundred dollars. Active noise-canceling models, due to their advanced technology, tend to be more expensive, often costing over 1,000 yuan or more.
In terms of application, passive noise-canceling headphones are commonly used in industrial settings like factories or construction sites, where they serve as protective gear. They are not ideal for environments where communication is necessary. Active noise-canceling headphones, however, allow users to hear important sounds while still reducing background noise, making them suitable for military, aviation, and other high-demand environments.
When it comes to frequency response, passive noise reduction is more effective at blocking high-frequency noises, but struggles with low-frequency sounds like engine hums or air conditioner vibrations. Active noise cancellation, on the other hand, excels at handling complex and low-frequency noise, making it ideal for use in cars, airplanes, and other noisy environments. It can reduce ambient noise by up to 25–30 dB, offering a more intelligent and effective solution.
However, active noise-canceling technology can sometimes affect sound quality. The processing of noise-canceling signals may introduce some distortion, leading to a less detailed audio experience. Some users also report feeling “stuffy†or experiencing a loss of clarity when using ANC headphones.
Active noise reduction
**In Summary**
Active noise-canceling technology has been around for decades and has now reached a level of maturity. It is gradually becoming more accessible to the consumer market. While passive noise reduction relies on material science and physical barriers, active noise cancellation uses intelligent signal processing to enhance noise suppression. Despite its advantages, the industry still faces challenges, particularly in terms of technical barriers. Many companies with core ANC technology are reluctant to share their proprietary methods, which can slow down broader innovation.
However, the trend is moving forward. Several domestic brands have started developing their own active noise-canceling solutions and plan to launch new products this year. As our living environments become more complex, the need for effective noise reduction is growing. The ultimate goal is to make noise-canceling headphones more widely available and bring the benefits of a quieter life to more people.
Passive noise reduction (seismic noise reduction)
Active noise reduction
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