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You’ll often come across terms like “acoustic shield,” “active noise cancellation,” “AI noise cancellation,” and many others, all used to emphasize a device’s ability to deliver clear and intelligible audio. With so much marketing jargon, the actual meaning of these terms can easily get lost. In this article, we break down the terminology and explain what each of these features really means in practical, easy-to-understand terms. **The key to it all: who benefits?** When you read the datasheets of headsets, VoIP phones, and collaboration hardware, there’s a lot of information about the various audio capabilities of these devices. When it comes to noise cancellation, however, it can be difficult to determine what exactly is being described. There are two primary types of noise cancellation, and the key to understanding them is to determine who benefits from each. The first, which is generally known as *active noise cancellation (ANC)*, benefits the wearer. ANC is a feature of headsets and earbuds that helps block sounds from the environment. In other words, it benefits the wearer, and not the listeners on the other end of the conversation. The second type of noise cancellation benefits the remote listener. The general term for this is *microphone noise cancellation*, but vendors use a wide variety of terms to describe it. Yealink calls it Acoustic Shield Technology (AST), Jabra and Poly call it environmental noise cancellation (ENC), while others simply call it noise cancellation or noise suppression. In all cases, the goal of this feature is to enable the human voice to be picked up by the local communications device and have all other sounds reduced or filtered out before sending the audio to the remote listener. So, it benefits the listeners on the other end of the communication. Ultimately, both are necessary for clear and effective remote communication. ### **How active noise cancellation works** ANC is a feature that is primarily found on headsets and earphones that uses built-in microphones to detect and analyze ambient noise. It then generates inverse sound waves in the headset that cancel out background noise. The result is that the wearer hears more of what is being played by the headphones (the voice of a remote caller, a videoconference participant, music, etc.) and less of the sounds around them, resulting in less distraction from the surrounding local environment. ANC is typically more effective with [binaural headphones](https://info.teledynamics.com/blog/meet-yealinks-impressive-bh74-binaural-noise-cancelling-bluetooth-headset), with either over-ear cups or in-ear buds, which help isolate the user from surrounding noise. It can, however, be employed with monaural earphones as well, with less effectiveness (for obvious reasons). ANC comes in several variations, depending on the headset or earphone vendor. These include hybrid ANC, adaptive ANC, and others, all of which perform a similar function but do so using differing methodologies and algorithms, achieving varying levels of effectiveness. ### **Microphone noise cancellation** Microphone noise cancellation can be achieved using various mechanisms, but all depend on the use of multiple microphones: anywhere from [three to five on a headset](https://info.teledynamics.com/blog/science-behind-yealink-bh71-noise-cancellation-headphones) or up to [16 or more on a room collaboration system](https://info.teledynamics.com/blog/yealink-meetingboard-pro-redefines-hybrid-collaboration-with-ai). One or more microphones are used to pick up the human voice, which is the sound we want to convey and to be clearly heard on the other end. At least one microphone is used to pick up ambient sound; that is, the environmental sounds in the vicinity of the speaker. Using a variety of techniques, captured sounds are digitized and then processed by specialized digital signal processors (DSPs), which filter out the noise. This includes office noises like typing and nearby conversations, outdoor noises like wind and street sounds, or even music, clapping, or slamming doors. There is a broader set of technologies used to achieve microphone noise cancellation beyond ANC, and this is true for several reasons. First of all, unlike ANC, the employment of the technology is not limited to headsets, but is also found on VoIP desk phones, webcams, and collaboration room endpoints and platforms. Second, it can be achieved using either hardware or software and can also be [aided by artificial intelligence](https://info.teledynamics.com/blog/practical-applications-of-ai-in-unified-communications), which is why we so often see “AI noise suppression” or similar terms in datasheets and marketing materials. Regardless of how it is achieved, or on what kind of device it is achieved on, microphone noise suppression ultimately enhances the ability of the human voice to be heard by remote participants over all other sounds in the environment. ### **Noise cancellation comparison table** The following table displays some of the terminology used for these technologies, along with an explanation of what they do and whom they benefit. | Term | Commonly used by | What it does | Who benefits most | Device types | | --- | --- | --- | --- | --- | | Active noise cancellation (ANC) | Yealink, Jabra, Sony, Bose | Uses built-in microphones to detect ambient noise and generate inverse sound waves to cancel background noise in the user's ears | The wearer | Headset/earbuds | | Hybrid ANC | Sony, Jabra, Poly | Combines internal and external microphones for more accurate and wider-range active noise cancellation | The wearer | Headsets/earbuds | | Adaptive ANC | Bose, Jabra, Sony | Automatically adjusts the level of noise cancellation based on the surrounding environment | The wearer | Headsets/earbuds | | Acoustic Shield Technology | Yealink | Employs multi-microphone beamforming that creates a virtual "shield" around the speaker's voice and filters out surrounding noise | The remote listener | Headsets/earbuds, IP phones, collaboration endpoints | | AI noise cancellation/reduction | Yealink, Cisco, Microsoft, Poly | Detects and suppresses non-speech sounds like typing, traffic, or chatter using AI | The remote listener | Headsets/earbuds, IP phones, collaboration endpoints | | Environmental noise cancellation (ENC) | Jabra, Poly, EPOS | Filters background noise from the microphone signal, so your voice sounds clearer during calls | The remote listener | Headsets/earbuds, IP phones, collaboration endpoints | | Noise suppression | Microsoft Teams, Zoom, Cisco | Software-based filtering that reduces background noise in real time during calls and meetings | The remote listener | Collaboration endpoints and platforms | | Noise reduction (NR) | General industry term | A broad term for any method (hardware or software) that lowers background noise levels | Depends on implementation (wearer or listener) | Headsets/earbuds, IP phones, collaboration endpoints | ### **Related audio features** You will often see additional terms and features that are related to audio on device datasheets. Such features are typically specialized for particular purposes. These include: - [Beamforming microphones](https://info.teledynamics.com/blog/how-yealink-meetingbar-a50-makes-virtual-meetings-feel-real) - Acoustic echo cancellation - Full-duplex audio with noise processing - [Far field voice pickup](https://info.teledynamics.com/blog/big-sound-small-size-yealinks-ultra-portable-sp9x-speakerphones) - Wind noise reduction - Smart/intelligent audio The following table summarizes these features and how they benefit users and endpoints. | Term | Commonly used by | What it does | Who benefits most | Device types | | --- | --- | --- | --- | --- | | Beamforming microphones | Yealink, Cisco, Logitech | Uses multiple microphones to focus on the direction of the speaker's voice and reject noise from other directions | The remote listener | Headsets/earbuds, IP phones, collaboration endpoints | | Acoustic echo cancellation (AEC) | All UC and conferencing vendors | Removes echo caused when a device's speaker audio is picked up by its own microphone | The remote listener | Headsets/earbuds, IP phones, collaboration endpoints | | Full-duplex audio with noise processing | Yealink, Poly, Cisco | Allows simultaneous speaking and listening while maintaining noise and echo control | Both local and remote parties | IP phones, collaboration endpoints | | Far-field voice pickup | Yealink, Cisco, conferencing vendors | Uses microphone arrays designed to capture voices clearly from a distance in meeting rooms | The remote listener | Collaboration endpoints | | Wind noise reduction | Jabra, Poly, Yealink | Uses specialized filtering to reduce low-frequency wind interference on microphones | The remote listener | Headsets/earbuds | | Smart audio / intelligent audio | Logitech, Cisco, Yealink | A marketing umbrella term for AI-driven audio enhancements like voice tracking, suppression, and auto optimization | Usually both, but mainly the remote listener | Headsets/earbuds, IP phones, collaboration endpoints | ### Conclusion Audio is arguably the most important part of any remote communication, whether it uses a headset, IP phone, collaboration endpoint, or mobile device. For this reason, noise cancellation of all types plays an important role in ensuring crystal-clear communications in both directions. Knowing more about what these features are and how they benefit users and their listeners goes a long way toward ensuring that you make the right choices for equipment procurement.   --- You may also like: [Demystifying codecs: digitizing the human voice](https://info.teledynamics.com/blog/demystifying-codecs-part-1-digitizing-the-human-voice) [Yealink WH63 E2: lightweight comfort meets powerful performance](https://info.teledynamics.com/blog/yealink-wh63-e2-lightweight-comfort-meets-powerful-performance) [What you need to know about IP cameras before you buy](https://info.teledynamics.com/blog/what-you-need-to-know-about-ip-cameras-before-you-buy)     Topics: [Yealink](https://info.teledynamics.com/blog/topic/yealink), [Peripherals](https://info.teledynamics.com/blog/topic/peripherals), [Headsets](https://info.teledynamics.com/blog/topic/headsets), [Conferencing](https://info.teledynamics.com/blog/topic/conferencing), [Collaboration](https://info.teledynamics.com/blog/topic/collaboration), [Communication](https://info.teledynamics.com/blog/topic/communication) ### Comments ## Welcome to our Think Tank In this blog you'll read our thoughts on business telephone systems. While a lot has changed in telecom since TeleDynamics was founded in 1981, we remain as committed as ever to delivering the best customer service in the industry. If you would like elaboration on a specific topic, please let us know in the comments section. 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