How is the audio quality of a phone measured?
In: Technology
You play a set of tones, the record those with a microphone or through a jack depending on what you want to measure, the replication or the speaker.
When you tell the driver (speaker) to play set tone at set volume, you can measure that from the signal or with a microphone. You then compare that to a reference chart of desired results.
You want different kinds of sound profiles for different uses, for media you want as accurate and broad as you can. For speech you want to limit the range to only speaking frequencies to make sure it can be heard as clearly as possible.
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