Most of the TWS impletements ANC. Why didnt it came to IEMs. Is it because of DSP implementation? Like the sound from noise cancelling microphone has to be processed to create a reverse signal and it has to mix it with ongoing signal? Using a wired can even have the implementation better right? For the power and the reduction in battery space.

Can anyone who works with IEMs or Headphones care to pitch up this topic?

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Akella333 t1_j5fupqv wrote on January 22, 2023 at 6:41 PM

Sony had done it before, where the NC worked with certain walkman models (digital) and Xperia phones.

ExiledSanity t1_j5glhlk wrote on January 22, 2023 at 9:32 PM

For ANC to be most effective the microphones should be at your ear. This makes more sense when everything else is at your ear too.

Also, the varying input power and other processing of audio in your source with an analogue output for IEMs (and if you have detachable cables, differences in frequency response and impedance in different IEMs) all would make the calculations of the inverse waveform much more difficult, if not impossible.

Within Bluetooth, everything is self-contained in the headphone or earbud. The processor knows exactly the impedance of the driver, the frequency response and volume. Any processing is passed to the headphone digitally so it can be accounted for in the digital to analogue conversion. And since everything is self contained the microphones can be placed as close to your ear as possible.

RubenRag t1_j5gjupm wrote on January 22, 2023 at 9:21 PM

IEM’s are passive, where are you implementing the ANC?

69001001011 t1_j5ihd1u wrote on January 23, 2023 at 5:51 AM

The answer most ppl aren't talking about, is that it adds cost and complexity to do it well. The added complexity is part of why tws only ever last a couple years before croaking.

Also, most tws use anc to compensate for their awful sound isolation. Most quality iems just block the noise passively and call it there.

dimesian t1_j5ko5i9 wrote on January 23, 2023 at 6:12 PM

Both Sony and Audio Technica make wired earphones with ANC, they seem to be more popular in Asia, they sell some in other markets but it seems to be limited to one or two models. Some sellers on Amazon list wired some earphones as noise cancelling but the ANC may only work with certain media players and cellphones. I think B&O had some ANC earphones in their Beoplay line.

rNV1s16iLiTi t1_j600uyo wrote on January 26, 2023 at 7:23 PM

They've existed for years. Bose QC20 has been around since 2015.