I am learning DPS and I came across the problem of deconvolution and removing the impulse response from a signal? This still does little sense to me.
My understanding of the impulse response is to find out the response, usually in frequency, of a device, a filter, a room etc. If I don't mess things here, to me, the impulse response in signal processing is equivalent to numeric 1. Finding the impulse response is convolving a signal with something that is equivalent to 1 that is the impulse response. So if I need to find what the value of x is, I simply multiply x by 1:
$$y = x\times1$$
Therefore if $y = 0.8$, I know $x = 0.8$ as well.
In DSP, we have the equation
$$Y = XH$$
So to know the impulse response of $X$, I multiply $X$ by $H$ and obtain $Y$ which is equal to $X$. I've gone that far.
I don't understand what deconvolution means. I though by applying the impulse response we have already an answer about the frequency of anything we need. What does deconvolution mean here and why would we look for it?