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Unformatted text preview: x ( t ) that can occur (about 10 kHz for commercial AM), you have to make sure that the RC time constant is short enough that no peak is missed, but not much shorter. This ensures that the envelope detector has an output that is close to the actual envelope. 2. Dont really understand modulation index. (1) The modulation index is deFned as max | x ( t ) m = | A where A is the amplitude of the carrier added to the modulated signal. when m < 100%, envelope detection correctly recovers the envelope ( x ( t ) + A ), and there is no demodulation error. When m > 100%, envelop detection results in distortion, because the resulting envelope is not x ( t ) + A . 3. No mud. (3) 42...
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- Fall '05