Noise cancelling speaker circuit

Year of fee payment : 4. Effective date : A first major aspect of the invention relates to an active noise cancelling system which detects ambient noise and applies electro-accoustic processing thereto to produce an acoustic signal for cancelling out the ambient noise. The active noise cancelling system may be used to cancel all noise but an audio signal which is desired to be heard by the user. A second major aspect of the invention relates particularly to a system for electronically cancelling noise input to a user microphone, by utilizing known characteristics of speech signal and ambient noise.

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Content:

• US5937070A - Noise cancelling systems - Google Patents
• Sound and Acoustics
• Echo Cancellation Explained
• How do I resolve issues with poor sound quality?
• Stereo Noise Reduction Circuit Working and Application
• Active noise cancelling
• The Best Noise-Cancelling Headphones
• Active noise control
• Building Noise Canceling Headphones

WATCH RELATED VIDEO: Active Noise Cancellation

US5937070A - Noise cancelling systems - Google Patents

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts.

It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I have a noise cancelling headphone that still works as a passive headphone when turned off, even with the battery removed. How does this work? In my mind noise cancelling is basically adding negative noise to the signal, so I suppose it is something like an adder. However, when it is turned off, it appears to still work as though the whole adder is not even there.

It seems unlikely that it drives the output through R2 and R3, as it would attenuate the signal. I'm trying to replicate this behaviour for a guitar pedal that adds extra stuff when turned on, but passes on the input when turned off. I guess they can use the power switch to bypass the output.

Can you see if it still work when you actually press the power switch? Is it even a power switch? Perhaps, the passive functionality of the earmuffs works in a similar manner with a typical headphone. Maybe, just maybe, the way the headphones are shaped the way they are, is to imitate the passive noise canceling feature which earmuffs have. Remove the padding around the ears and see if your passive noise canceling feature disappears, if it does, then we can finally come to terms to why the padding around the ears exists.

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How does the power switch of an active noise canceling headphone work?

Asked 3 years, 10 months ago. Active 3 years, 10 months ago. Viewed times. Pepijn Pepijn 1 1 gold badge 9 9 silver badges 22 22 bronze badges. As the headphones still works without batteries, there's obviously no opamp in the signal path. How yours works, you have to take our apart. I know they exist in larger sizes including subwoofers , but I don't know if they exist in headset sizes. Add a comment. Active Oldest Votes. Bimpelrekkie Bimpelrekkie Also there's not that much power going into a headphone so its not like an mp3 player's battery life is suddenly halved by these resistors.

In practice, you will be unable to notice that. PS: A similar approach can be found in OD pedal. I think it's unlikely a relay or double throw switch is used. Sap Chicken Sap Chicken 1 1 1 bronze badge.

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I see it now. Harry Svensson Harry Svensson 7, 3 3 gold badges 29 29 silver badges 51 51 bronze badges. They do attenuation. For noise cancellation we need to actively generate sound pressure waves in anti-phase. Hmm, maybe some can. I can't. The Overflow Blog. Adapting a design system to work for the Metaverse. Podcast Explaining the semiconductor shortage, and how it might end.

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Sound and Acoustics

Noise cancelling headphones are an ideal choice for many music listeners for their ability to cut out ambient noise without raising the audio volume to levels that might be dangerous for the ear. Even with no music playing, the headphones have the ability to mute ambient noise — perfect for those trying to work or sleep in environments where ambient noise is commonplace e. There are several methods of noise cancellation with headphones. Other designs contain more complex feedback systems such as those designs that use a microphone on the inside of the headphone to determine the level of noise cancellation that is occurring. Additionally, digital designs that incorporate adaptive filtering are prevalent in many commercial products today.

Echo Cancellation Explained

A: The goal is to have some sort of embedded system adjunct which adds minimally to cost, weight, and power consumption, yet counteracts any undesired ambient acoustic noise which affects the ability to hear desired sounds coming to the ear, or simply annoys the user. Note that this is not the same as reducing the noise at the source, which is often impractical or impossible. Instead, the intention is to reduce the noise as perceived by the listener This counteraction can come directly via earpiece, or as part of the general ambiance of a situation room, cabin. A: Many do. Anyone using a smartphone in a noisy area, sitting in an airplane with its constant background noise-drone sound, people trying to do a conference call using a desktop speakerphone, a car which has engine and road noise although has been great progress in this last area due to improved mechanical design and soundproofing, but that has reached its limit. In general, passive approaches are simpler, more reliable, and less costly. Then, in theory, the original noise and this antinoise will cancel out. If the desired signal is going to a headset or earbud, the antinoise be simply added electronically it takes just one op amp to the incoming signal; if the offending noise is part of the surroundings where people are not wearing earpieces passengers on an airplane, for example , then use the antinoise to drive loudspeakers.

How do I resolve issues with poor sound quality?

Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : Effective date : This invention relates to a method and an apparatus for reducing ambient noise for use with a headset or a boom headset attached to a boom microphone device or the like.

Stereo Noise Reduction Circuit Working and Application

A stereo noise creates a huge disturbance, especially when you are listening to weak radio stations. Peaks of unwanted background noise take over the broadcast signal, making it unpleasant. The noise is always disturbing in the intervals when the music stops. Different noise filters, noise removal strategies. A stereo noise reduction circuit is used to overcome the problem by limiting the noise peaks. It will attenuate the signal output by 45dB when the input music signal is very weak.

Active noise cancelling

For frequent flyers or commuters on public transit, reducing the noise around you is the difference between enduring a trip and enjoying it. Noise-cancelling headphones can make your music easier to hear and your world a little more peaceful. We use a specialized audio measurement system with a simulated ear to test how much noise the headphones can reduce. Our audio experts listen for detailed, authentic sound and clear microphone quality for phone and video calls. A good design should fit most ear shapes and head sizes, so we have a variety of people try on our top contenders. True wireless earbuds should play for five hours or more.

The Best Noise-Cancelling Headphones

Effective date : Year of fee payment : 4. This document discusses, among other things, systems and methods for active noise cancellation.

Active noise control

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In the past, when one thought of noise in the workplace, heavy industrial noise usually came to mind. Excessive noise of that type can be damaging to the health of the worker. Today, at a much lower level, though not as severe a health hazard in office environments, noise from equipment such as personal computers, workstations, servers, printers, fax machines, etc. In the case of personal computers, workstations and servers, the noise usually emanates from the disk drive and the cooling fans. This article is about the problem of noise from server cooling fans, but the principles can be applied to other applications with similar features. Noise from server cooling fans can be annoying, especially when the server is located near the user.

Building Noise Canceling Headphones

Received 15 May ; accepted 21 July ; published 26 July With the purpose of reducing the influence of background noise on the call quality of mobile phones, background noise suppression circuit is designed based on the principle of self-adaptive noise cancellation. Because this method is not involved in the nature of the noise itself, it can be used both for stationary noise cancellation and quasi-stationary noise cancellation. The working principle and circuit design of the system are introduced in detail. Simulated experiment was conducted in the lab, and its experimental results were analyzed.

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