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2. A voice having 3,4 KHz frequency is recorded as digitally by using PCM encoding has 20 minutes-length. It occupies 15,56 MByte in the computer

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2. A voice having 3,4 KHz frequency is recorded as digitally by using PCM encoding has 20 minutes-length. It occupies 15,56 MByte in the computer if minimum amount of sampling is used in digitizing the signal, how many bits are used for each sample. Prove it. (15 p)

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