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Normally the carrier frequency is supposed to be greater than the audio frequency. For audio signals of human speech and musical instruments with frequencies to 20 khz, we use a carrier frequency greater than 20 khz.

We use a carrier frequency > audio freq
    or ,  carrier frequency >  500 hz

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Carrier frequency should be greater than audiofrequency.here the audio frequency is 500hz so carrier frequency >20khz
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