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The dynamic EQ based on a microphone is an interesting choice. I don't even know if the two are related, not being sound/audio/whatever expert, but I'm continu

The dynamic EQ based on a microphone is an interesting choice. I don't even know if the two are related, not being sound/audio/whatever expert, but I'm continually amazed that I can blast music on a HomePod, speak in a conversational tone or quieter (of course I've tested), and Siri still hears me. Whatever dark wizardry makes that work would come in handy here, yes? Or is your argument more that, dark magic or not, the physical hardware isn't there?

unlinked_dll 7y ago
Eh not really. The limitation on active noise reduction is mostly latency, and hardware constraints when using adaptive filtering in a small package without a large battery. Whatever "Adaptive EQ" means it may or may not be particularly novel. I've seen worked on things similar for years - changing filter parameters in response to microphone input isn't always easy but it's not untrod ground. Going to have to listen to it to be the judge of anything, like all audio products.
- willis936 7y ago
  Adaptive EQ is a well established piece of jargon in telecommunications. I’m not sure if that’s actually what they’re doing here, but it would be interesting if they are. The ear canal makes a resonant cavity and they could notch out annoying peaks in the mid-highs that vary from each seating of the buds. This could also be used to level out the magnitude response if they hadn’t made it an open cavity.
willis936 7y ago
It’s all DSP tricks. They can take you pretty far down in receiving signals with bad SNR, but they have limits. The issues here are physics limitations. IEMs are not like subwoofers. They’re more like if your head was inside the enclosure. Porting the enclosure kills some useful resonances. Small drivers need these resonances to make low frequencies because the diameter is simply not large enough. If you want the quick n dirties about this stuff you can check out IEM design guidelines. They're pretty shoddy and not rigorous, but serve as a decent diving off point. https://www.sonion.com/wp-content/uploads/Documentation_Designing_Earphones.pdf https://www.sonion.com/wp-content/uploads/Documentation_Desi... https://www.digikey.com/en/supplier-centers/k/knowles https://www.digikey.com/en/supplier-centers/k/knowles

unlinked_dll 7y ago

Eh not really. The limitation on active noise reduction is mostly latency, and hardware constraints when using adaptive filtering in a small package without a large battery. Whatever "Adaptive EQ" means it may or may not be particularly novel. I've seen worked on things similar for years - changing filter parameters in response to microphone input isn't always easy but it's not untrod ground. Going to have to listen to it to be the judge of anything, like all audio products.

willis936 7y ago
Adaptive EQ is a well established piece of jargon in telecommunications. I’m not sure if that’s actually what they’re doing here, but it would be interesting if they are. The ear canal makes a resonant cavity and they could notch out annoying peaks in the mid-highs that vary from each seating of the buds. This could also be used to level out the magnitude response if they hadn’t made it an open cavity.

willis936 7y ago

It’s all DSP tricks. They can take you pretty far down in receiving signals with bad SNR, but they have limits. The issues here are physics limitations. IEMs are not like subwoofers. They’re more like if your head was inside the enclosure. Porting the enclosure kills some useful resonances. Small drivers need these resonances to make low frequencies because the diameter is simply not large enough. If you want the quick n dirties about this stuff you can check out IEM design guidelines. They're pretty shoddy and not rigorous, but serve as a decent diving off point. https://www.sonion.com/wp-content/uploads/Documentation_Designing_Earphones.pdf https://www.sonion.com/wp-content/uploads/Documentation_Desi... https://www.digikey.com/en/supplier-centers/k/knowles https://www.digikey.com/en/supplier-centers/k/knowles