Modern active noise control is generally achieved through the use of analog circuits or digital signal processing. Adaptive algorithms are designed to analyze the waveform of the background aural or nonaural noise, then based on the specific algorithm generate a signal that will either phase shift or invert the polarity of the original signal. This inverted signal (in antiphase) is then amplified and a transducer creates a sound wave directly proportional to the amplitude of the original waveform, creating destructive interference. This effectively reduces the volume of the perceivable noise.
A noise-cancellation speaker may be co-located with the sound source to be attenuated. In this case, it must have the same audio power level as the source of the unwanted sound in order to cancel the noise. Alternatively, the transducer emitting the cancellation signal may be located at the location where sound attenuation is wanted (e.g. the user's ear). This requires a much lower power level for cancellation but is effective only for a single user. Noise cancellation at other locations is more difficult as the three-dimensional wavefronts of the unwanted sound and the cancellation signal could match and create alternating zones of constructive and destructive interference, reducing noise in some spots while doubling noise in others. In small enclosed spaces (e.g. the passenger compartment of a car) global noise reduction can be achieved via multiple speakers and feedback microphones, and measurement of the modal responses of the enclosure.
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Applications can be "1-dimensional" or 3-dimensional, depending on the type of zone to protect. Periodic sounds, even complex ones, are easier to cancel than random sounds due to the repetition in the waveform.
Protection of a "1-dimension zone" is easier and requires only one or two microphones and speakers to be effective. Several commercial applications have been successful: noise-cancelling headphones, active mufflers, anti-snoring devices, vocal or center channel extraction for karaoke machines, and the control of noise in air conditioning ducts. The term "1-dimension" refers to a simple pistonic relationship between the noise and the active speaker (mechanical noise reduction) or between the active speaker and the listener (headphones).
Protection of a 3-dimension zone requires many microphones and speakers, making it more expensive. Noise reduction is more easily achieved with a single listener remaining stationary but if there are multiple listeners or if the single listener turns their head or moves throughout the space then the noise reduction challenge is made much more difficult. High-frequency waves are difficult to reduce in three dimensions due to their relatively short audio wavelength in air. The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear;[1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise louder, not softer.[a] High-frequency sounds above 1000 Hz tend to cancel and reinforce unpredictably from many directions. In sum, the most effective noise reduction in three-dimensional space involves low-frequency sounds. Commercial applications of 3-D noise reduction include the protection of aircraft cabins and car interiors, but in these situations, protection is mainly limited to the cancellation of repetitive (or periodic) noise such as engine-, propeller- or rotor-induced noise. This is because an engine's cyclic nature makes analysis and noise cancellation easier to apply.
Modern mobile phones use a multi-microphone design to cancel out ambient noise from the speech signal. Sound is captured from the microphone(s) furthest from the mouth [noise signal(s)] and from the one closest to the mouth [desired signal]. The signals are processed to cancel the noise from the desired signal, producing improved voice sound quality.[citation needed]
In some cases, noise can be controlled by employing active vibration control. This approach is appropriate when the vibration of a structure produces unwanted noise by coupling the vibration into the surrounding air or water.
Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations, or legal compliance. Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather than a power source.
Active noise cancelling is best suited for low frequencies. For higher frequencies, the spacing requirements for free space and zone of silence techniques become prohibitive. In acoustic cavity and duct-based systems, the number of nodes grows rapidly with increasing frequency, which quickly makes active noise control techniques unmanageable. Passive treatments become more effective at higher frequencies and often provide an adequate solution without the need for active control.[2]
This noise cancellation can be achieved in different ways, including microphone shape and positioning, digital signal processing, and other tech words. Some headsets even come with a special wind sock that practically eliminates all wind noise.
I have the same issue and would love to know Wyzes reason and hopefully a fix for it. It is frustrating constantly wondering if ANC is turned on or not. I have noticed nose cancelling turns off frequently right after I adjust my headphones on my head. At first I thought I might have been accidentally hitting the ANC button or triggering the auto-pause function, but I was not (and I disabled auto-pause to test).
Just wanted to chime in and say this is a problem for both pairs of headphones that I own. They both randomly exit NC mode and I have to press the button on the left earpiece to re-enable it. It seems to coincide with Spotify starting a new song, but otherwise there is no other apparent cause.
Wyze seems to disdain any sort of written support. I have emailed them and contacted them on Twitter seeking support and in both instances they have insisted that I call them before they will do anything.
Any update on this? My headphones keep turning off noise cancellation randomly and sometimes constantly. It also pauses video while watching and turning off noise cancellation. No updates to firmware available.
The only fix I could find for the frustrating noise cancellation problem was to toss the damn things in the trash. The final straw came when the right side of the headphones developed a buzz for seemingly no reason. For all the things that Wyze got right, they dropped the ball big time on the headphones.
Noise-cancelling technology cannot wholly isolate sound due to the air trapped between your audio device and eardrum. However, the air is essential for you to hear music. Suppose you removed the trapped air; the net effect is silence, no matter what volume your music is on. Why? There would be no medium for the sound to travel from the audio device to your eardrum.
Noise-cancelling audio devices use a built-in microphone to analyse the ambient sound waves around you and generate the opposite sound waves to reduce surrounding sound. Noise-cancelling devices have a built-in microphone which produces the opposite reversed sound waves to neutralise surrounding noise. Noise cancellation works best when the ambient sound around you is constant and around the low to medium pitch range.
Now consider the fluctuating pitch levels when you speak. The sudden changes in pitch occur too frequently and make it difficult for any noise-cancelling audio device to analyse and process these differences. Therefore, you hear some noises whilst others are cancelled out.
Bambulab is using their own custom stepper motor drivers. I don't know what Prusa is actually using but their work on motor noise cancelleation might depend not only on Firmware but also on hardware. Key people from Bambulab are coming from DJI so they seem to have real expretise on motor control, hardware and software.
I don't know all that much about the details of stepper drivers so it would be cool if someone with more expertise can comment if that noise cancellation is potentially doable outside of Bambulab hardware setups.
PS: A great way to reduce noise are enclosures. The XL would need good and somewhat affordable off the shelf enclosure options, from Prusa or elsewhere. Maybe they exist already but that would go a long way already.
It was my understanding that the Bambulab approach is a bit more sophisticated than that but maybe I just have no clue, which I am ready to admit when it comes to stepper motors. It is just that I think that the Bambulab CEO said in the CNC Kitchen interview that the solution is partly based on their custom stepper motor driver, so not a pure firmware solution.
Well if it's in their driver it is a FW solution. Regardless, I really doubt they actually make a cancelling sound as in noise cancelling headphones. Just my opinion, I don't have a Bambu (not yet), but it would not make biz sense to go to that much trouble. The Bambu machines like all the other single extruder machines, can go low current. Smaller motors need lower current, larger motors need more. The steppers in the XL for X/Y are larger than medium sized lamination stacks and as such are probably a higher motor current. Again though I think there's way way more sound coming from the fans then the steppers!
Correct me if I'm wrong but noise cancellation requires a microphone to get feedback about the noise produced as it adjusts things motor wise. That would imply that the hardware has a microphone available to perform that task.
IMO, I would rather Prusa puts its very finite resources to polishing the FW and PrusaSlicer. If noise is a problem for you then it would be a good idea to NOT have the machine in a place within your work or living environment: 152ee80cbc
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