In the passband of an ideal filter, the amplitude is ...

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Multiple Choice

In the passband of an ideal filter, the amplitude is ...

Explanation:
In the passband, the filter is meant to pass those frequencies with the same strength, so the magnitude response is flat. This means the amplitude is constant across all frequencies within the passband, often normalized to unity. The phase of the signal is a separate concern—choices about phase (zero, linear, or nonlinear) do not determine the passband amplitude. The notion of infinite attenuation belongs to the stopband, where frequencies are suppressed.

In the passband, the filter is meant to pass those frequencies with the same strength, so the magnitude response is flat. This means the amplitude is constant across all frequencies within the passband, often normalized to unity. The phase of the signal is a separate concern—choices about phase (zero, linear, or nonlinear) do not determine the passband amplitude. The notion of infinite attenuation belongs to the stopband, where frequencies are suppressed.

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