开云体育

Dynamic mic details

Mark Kahrs All Messages By This Member #36487 This is just for my simulations, but does anyone have the detailed specifications of a dynamic mic?? Like Theile-Small, only backward.
kennjava All Messages By This Member #36503 Some parts of Thiele Small measurements can't easily be done (eg delta mass), but it seems possible to feed a dynamic mic element with a small mic-level signal, scale up the resistance in series, and measure level vs frequency across the capsule to get an idea of resonances etc. https://sbacoustics.com/wp-content/uploads/2021/01/Measuring-Thiele-Small-parameters.pdf
Jerry Lee Marcel All Messages By This Member #36508 开云体育 The problem is that the microphone capsule cannot usually be accessed separately. Part of its enclosure and the delay filter cannot be separated, so the impedance measurement will probably show secondary resonances and a different resonnace that the capsule alone. In addition, the part where one needs attaching a weight to the diaphragm seems hardly feasible. Le 01/07/2024 à 00:03, kennjava a écrit?: toggle quoted message Show quoted text Some parts of Thiele Small measurements can't easily be done (eg delta mass), but it seems possible to feed a dynamic mic element with a small mic-level signal, scale up the resistance in series, and measure level vs frequency across the capsule to get an idea of resonances etc.
Mark Kahrs All Messages By This Member #36513 As usual, I should have been more specific and detailed.?? I was holding up T-S parameters as an example of a lumped parameter model.? The specific parameters can be separated by domain. 1). Electrically, it's Re and Le, the resistance and inductance of the voice coil --- this doesn't change in a dynamic mic.? The force factor, Bl, can also be a mic parameter. 2). Next up, it's the mechanical variables: Rms, Cms and Mms (or Mmd), the damping, compliance and mass of the diaphragm.? Looking at Bauer's equivalent circuits (e.g. "Century of Mics"), you'll see that this is present in his model as well. 3). Lastly, the acoustical circuits.? Here the model is vastly different.? First,? there's the equalization tube (Lt, Rt).? In the loudspeaker, you'll find Vas, which is the volume equivalent of the compliance.? That's not relevant here.? Bauer's diagram in "Transformer Analogs of Diaphragms" is instructive.? You find two transformers, one for the surround (call it Ss) and one for the diaphragm (call it Sd in keeping with loudspeaker parlance).? Behind the diaphragm, you have a completely different circuit having volumes for the coil and the back volume. I left off Fs and Xmax, although these are relevant here as well. toggle quoted message Show quoted text On Sun, Jun 30, 2024 at 10:52?PM Jerry Lee Marcel via <jerryleemarcel=[email protected]> wrote: The problem is that the microphone capsule cannot usually be accessed separately. Part of its enclosure and the delay filter cannot be separated, so the impedance measurement will probably show secondary resonances and a different resonnace that the capsule alone. In addition, the part where one needs attaching a weight to the diaphragm seems hardly feasible. Le 01/07/2024 à 00:03, kennjava a écrit?: Some parts of Thiele Small measurements can't easily be done (eg delta mass), but it seems possible to feed a dynamic mic element with a small mic-level signal, scale up the resistance in series, and measure level vs frequency across the capsule to get an idea of resonances etc.

Previous Topic Next Topic