Smartphones Have Microphones – Part 1

There is a multitude of apps for Smartphones that can turn them into sound level meters, recording devices, playback devices, and even allow them to be coupled with external devices for hearing aids via Bluetooth or other wireless protocols. However, each step in the recording/playback/control pathways can add some error to the final measured result.…

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Speech is not a broadband signal… but music is.

We tend to be biased, both in our training and in our technologies that we use. We tend to look at things based on spectra or frequencies.  Phrases such as “bandwidth” and long term average speech spectrum show this bias. The long term average speech spectrum, with is averaged over time, is indeed a broad bandwidth spectrum…

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