How is bH related to the frequency response H of the causal system de- scribed by the linear, constant-coefficient difference equation y[n] = x[n] + y[n 1], where || < 1, and x and y denote the input and output, respectively? (iv) Determine the impulse response values h[n], n Z. Then use the up- sampling property to determine the sample values of the impulse re- sponse bh[n]. 9