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Which is used in the telecommunication applications which has a limited bandwidth of 300 to 3100 HZ?

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Which is used in the telecommunication applications which has a limited bandwidth of 300 to 3100 HZ?

(a) linear codec

(b) logarithmic codec

(c) PCM

(d) DPCM

The question was posed to me in unit test.

This question is from Codecs in portion Interfacing to the Analog World of Embedded Systems

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The correct choice is (b) logarithmic codec

For explanation I would say: The logarithmic codec is frequently used in the telecommunication system which have a limited bandwidth of 300 to 3100 Hz. this can provide an 8-bit sample at 8 KHz, which are used in the telephones. The commonly used are A-law and µ-law.

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