Data Returned By Audio Read ?

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crixus
crixus 2017-2-8
评论： Kayla Magee 2018-3-1
Hello all, I have a question in regards to audioread function in matlab (might be easy to some of you). Audioread('wave.wav') will return a normalized data of -1 to 1. So what exactly is this data type ? example if you measure vibration through use of vibration sensor, the data you can be be m/s (speed of vibration) etc or if you measure temperature using temperature sensor, you will get degree cel etc so if you use audioread on a wav file what is the data type (units) ?? It is sound pressure ?
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KSSV
KSSV 2017-2-8
If vibration and temperature are not audio files then using audioread is ruled out.
crixus
crixus 2017-2-9
i guess you dont understand my question ....

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Jan
Jan 2017-2-9
编辑：Jan 2017-2-9
The wav file contains the audio signal after the AD sampling. Then it means xVolt, where x is an an scaling factor, which depends on different values and does not matter for the processing. The value represents the amplitude of the sound, when recorded by the microphone, therefore it is actually a pressure.
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crixus
crixus 2017-2-12
alright. thanks for your input, appreciate it.
Kayla Magee
Kayla Magee 2018-3-1
Where the output is xVolt, is the 'voltage' a peak to peak voltage? What is the specific amplitude? i.e. peak to peak, peak, rms, etc. ?? Thanks!

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