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[SOLVED] ADM vs PCM in .wav media file

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marios2001

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Hello,

i have an assingment on PCM and ADM coding on matlab.I have a .wav media file PCM coded with 16-bits and i have to make the PCM coding for 32,40,64 kbits/s,and the ADCM for 32,40,64kb/s.

this is the results i get when i run my program (not Db):
PCM
(bit_rate= 32Kb/s)
SNR =

6.3789
(bit_rate= 40Kb/s)
SNR =

19.6507
(bit_rate= 64Kb/s)
SNR =

946.9732

ADCM

For 32Kb/s
SNR =

14.5593

For 40Kb/s
SNR =

22.4417

For 64Kb/s
SNR =
57.2012

Why PCM's SNR for 32,40 kb/s is lower than the ADCM's ?
 

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