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SoundMeter / Re: Interaction of SoundMeter and "made for iPhone" hearing aids
« Last post by FaberAST on January 05, 2017, 12:03:28 PM »

Bluetooth mic input is typically sampled at 8 kHz. The weighting filters in the Meter and the bandpass filters in the Octave analyzer are designed to operate at multiples of 44.1 kHz and 48 kHz, which would explain the "Unsupported Sample Rate" message.

It seems that some time ago Apple changed the behavior of Bluetooth audio in iOS (at least in the Measurement Mode that SoundMeter uses). Since SoundMeter requires both input and output from the audio system, Bluetooth won't work unless you are using a Bluetooth headset (or hearing aids, in your case) with both input and output. Unfortunately, if you use a headset for input and output, then the sample rate will be restricted to 8 kHz (for both input and output).

This is a change from how Bluetooth used to work on iOS, when it was possible to use the built-in mic with Bluetooth output.

I wish I had better news.

SoundMeter / Interaction of SoundMeter and "made for iPhone" hearing aids
« Last post by sbiggar on January 02, 2017, 12:47:52 PM »
I realize my request is not typical and is probably not a real issue but I'm not sure where else to ask.

I've got SoundMeter 8.4.3 (r1594) with the Octave Analyzer option installed on an iPhone 6 Plus running iOS 10.2.  I'm older and use hearing aids (moderate to severe high frequency loss) so I'm interested in sound levels in various environments (like my office with loud air handlers).  Recently I got new "made for iPhone" hearing aids from Oticon (Opn).  The aids connect to the phone using Bluetooth and cell phone calls are routed directly to the hearing aids but the internal iPhone microphone is used for transmitting sound for phone calls.  When the hearing aids are connected, the Octave analyzer will not run.  It issues a message in a white box:  Unsupported Sample Rate The selected input device operates at a sample rate which is not supported for octave band analysis.

The SoundMeter Meter part works fine using the "Bottom microphone" input with or without the hearing aids connected.

I assume that the hearing aid connection has set up the audio sampling hardware in a mode that is incompatible with the analyzer.

I wonder if an external calibrated mic with external A/D and electronics (iTestMic2 for example) would work correctly with SoundMeter and the analyzer option with my hearing aids connected to the phone?


SoundMeter / Re: Can I use SoundMeter to measure noise via my Windows laptop?
« Last post by FaberAST on March 30, 2016, 10:23:17 AM »

I'm not aware of any affordable sound level meter software for Windows.

You might consider an iPod touch as a less expensive alternative to the iPhone. The accuracy of your measurements will depend on the quality of your calibration, regardless of which device you use. You can get more reliable measurements with an external measurement microphone, like the MicW i436.

SoundMeter / Can I use SoundMeter to measure noise via my Windows laptop?
« Last post by zleo99 on March 21, 2016, 01:39:34 AM »
Please help me: I have a butchery backing onto my flat whose chillers make variable loud noise 24/7 and especially at night.  I would like to be able to monitor the noise myself on a continuous basis, but I don't want to buy an iPhone especially to run SoundMeter; and anyway, "Evaluation of smartphone noise apps"
says the iPhone 5 is not very accurate.
Is there SoundMeter software to use on my Windows laptop??
Many thanks for your help
SoundMeter / Re: Using Exteral Microphones and Calibration
« Last post by FaberAST on January 25, 2016, 10:27:37 AM »
SoundMeter's built-in documentation includes a device input voltage calibration tutorial.

To access the documentation, tap the info button ("i") in the toolbar at the top of the main screen. Then, tap on Help in the Info screen.
SoundMeter / Re: Using Exteral Microphones and Calibration
« Last post by RedWood on January 25, 2016, 04:13:02 AM »
Hi Ben thanks for the reply, The https://peblueprint.com/bathmate-review new bathmate is great. Do you have a guide how to perform a voltage calibration?


That would be very helpful. I can't seem to find any step by step voltage calibration guides online.
Electroacoustics Toolbox / measuring impedance of louspeaker by 2 FFT a short recipe
« Last post by audiot1949 on November 14, 2015, 06:49:23 AM »
Hi All,
Because I think that measuring according impedance to faber's YOUTUBE and other sources seemed to me rather complicated, I made my own (short) description.
This describes step by step 'how to' setup and measure the impedance of loudspeakers.
You will find a setting for low impedances and for 100 V systems.
I packed all the cabling, switches and resistors in a junction box. This prevents much fiddling with the cables.
Unfortunately the file is 1.4 MB large so it exceeds the upload limit.
Because of forum restrictions I can't upload the in this file mentioned EXCEL calculation too.
Therfore I will give you a link to download both in a folder.

After working with 2 FFT I find this app really really great!

...At my page you might find another interesting article:

Have fun!
Electroacoustics Toolbox / Oscilloscope: Crest & RMS & Peak
« Last post by audiot1949 on November 01, 2015, 01:15:20 PM »
It seems, that Crest & RMS & Peak are calculated from the start to the end of the recorded thread.
Is this really so intended or shouldn’t these values calculated between Cursor 1 and 2?
Electroacoustics Toolbox / Nice to have: “waterfall” diagram
« Last post by audiot1949 on October 31, 2015, 10:48:13 AM »
(this should be not mixed up with a “spectrogram”)
This waterfall diagram gives normally in the x-axis the frequency, in the z-axis the level and in the y-axis the time and shows the “decay” of the sound.
It is e.g. calculated by a sweep like produced by the excitation of the DFFT and can be used in rooms in the far field to detect modes and resonances. In measuring loudspeakers (near field) it can be used to detect resonances.
(please see to enclosed example)
Electroacoustics Toolbox / Dual FFT Analyzer: Excitation „misleading“ Pre-sends
« Last post by audiot1949 on October 31, 2015, 10:47:16 AM »
It seems that the setting of the values of „Pre-sends“ has no influence.
The excitation runs nonstop when you start the machine regardless whether you enter 0 or 99. In some cases it makes sense to take single shots only.
In my opinion it would make more sense either to store automatically the latest measurement after the given pre-send # is achieved OR the function stops when the # is achieved. Then you can decide to store it or start a new measurement.
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