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?
Thanks.