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If HD(ω) is the frequency response of the low pass filter, then for what value of ω, HD(ω)=1?(a) |ω| = π/D(b) |ω| ≥ π/D(c) |ω| ≤ π/D(d) None of the mentionedThe question was asked in an international level competition.I want to ask this question from Decimation by a Factor D in chapter Multirate Digital Signal Procesing of Digital Signal Processing |
Answer» RIGHT option is (c) |ω| ≤ π/D The explanation is: The INPUT sequence x(n) is passed through a LOW pass FILTER, characterized by the impulse RESPONSE h(n) and a frequency response HD(ω), which ideally satisfies the condition, HD(ω)=1, |ω| ≤ π/D =0, otherwise. |
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