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y(t)=h(t)*x(t) where y(t) is the output , x(t) is the input and h(t) is the impulse response.(* is the convolution)

The definition of convolution is

y(t)=integration from -infinity to +infinity (h(tau)x(t-tau)d(tau)

p/s: i don't know how to use mathematical equation inhere. just joining the group

i know that if h(t) =delta(t) then y(t)=x(t).

now here comes my confusion, if h(t)=f(t)delta(t), then what is y(t)?

can anybody give me any ideas?

thanks for the help.

zai