Let hlp[n] denote the impulse response of an FIR generalized linear-phase lowpass filter. The impulse response hhp[n] of an FIR generalized linear-phase highpass filter can be obtained by the transformation
h hp[n] = (−1)nhlp[n].
If we decide to design a highpass filter using this transformation and we wish the resulting highpass filter to be symmetric, which of the four types of generalized linear-phase FIR filters can we use for the design of the lowpass filter? Your answer should consider all the possible types.
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