Fix dictaphone buffer length

[vincerubinetti]

After coming across this StackOverflow answer, I believe since the dictaphone is showing getByteTimeDomainData, the buffer length should be the fftSize, not the frequencyBinCount (fftSize/2). I'm not an expert in audio processing, but the comments on that post seem to confirm this, and it is also backed up by it working this way in this other MDN example on getFloatTimeDomainData.

I guess it's not really a big deal, practically speaking in the case of this example. It's just throwing out half of its wave data every frame, but you can still get a good idea of your mic signal. But a lot of people follow this example for education purposes, and I think it should be fully correct.

[pepelsbey]

Hey! Thank you for the suggestion. I have an additional one since we’re using analyser.fftSize in two places now: declare the bufferLength and then use it.

- analyser.fftSize = 2048;
- const bufferLength = analyser.fftSize;
- const dataArray = new Uint8Array(bufferLength);
+ const bufferLength = 2048;
+ const dataArray = new Uint8Array(bufferLength);
+ analyser.fftSize = bufferLength;