# Questions tagged [stereo-signal]

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### Beyond “mid-side”: decompose an audio stereo recording (coincident microphones) into Mid + 45° + 90°

Context: I have done in the past stereo recordings in XY position (coincident microphones): from a source far from at least 20 meters (example: piano in a big reverberant building). Since the ...
34 views

### Why does this video's audio change depending on the playing device?

Yesterday I noticed that if I played this video from my smartphone on speaker, one could barely hear anything. On the other hand, if I used earphones I could hear it perfectly. Then, I tried with ...
666 views

### Is there any relation between mono/stereo recording and the peak frequency of sound detected?

I'm using pyaudio to record sound and return the peak frequency of the recorded sound. In one example, I use a sound card with 2 channels (stereo), and the peak frequency detected is the correct ...
28 views

### Manipulating line level signals

I need to manage several line level signals (physically, not in software), and need to know what to expect. I was expecting AC signals, but am not quite sure. Are line level audio signals AC or DC? ...
In the time domain let's say we have a signal $L_t$ and $R_t$. Then we can do mid/side encoding/decoding like so: $$M_t = \frac{L_t + R_t}{2}$$ $$S_t = \frac{L_t - R_t}{2}$$ $$L_t = M_t + S_t$$ ...