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47
IN
DEPTH
SAMPLE RATE CONVERSION FILTERS - ADA 24/96
Fig. 2
Fig. 3 illustrates how attenuation is performed just above
FS/2 when operating at 48kHz sampling rate. As shown in
fig. 4 alias components will be reflected around FS/2 and
will disturb the high but still audible frequencies.
Fig. 3
Fig. 4
0dBFS
-24dB
-48dB
-72dB
-96dB
-120dB
-144dB
DC
12k
24k
36k
48k
60k
72k
84k
96k
FREQUENCY
Fs/2
48kHz
Fs
96kHz
LEVEL
96kHz Sampling
Reproduced downsampled signal
Fs/4
24kHz
Note: Different downsampling
algorithms available
0dBFS
-24dB
-48dB
-72dB
-96dB
-120dB
-144dB
DC
12k
24k
36k
48k
60k
72k
84k
96k
FREQUENCY
LEVEL
Fs/2
48kHz
Fs
96kHz
96kHz Sampling
Attenuation of analog input signal vs frequency