3 core circuitry attributes, 1 asrc attributes, 1 response – Cirrus Logic CS42L73 User Manual
Page 129: Cs42l73, Figure 53. asrc frequency response, Figure 54. asrc passband frequency response
DS882F1
129
CS42L73
8.3
Core Circuitry Attributes
8.3.1
ASRC Attributes
8.3.1.1
Response
The following curves illustrate the ASRC frequency response. The horizontal frequency axis is normalized
to the external Fs (Fs
ext
, the serial port sample rate), because for all external Fs values, the plots are ex-
actly the same—only the scaling of the horizontal axis changes. Hence, the frequency for a given point
on the curves and a given external sample rate is the normalized frequency axis point multiplied by the
external frequency.
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
−200
−180
−160
−140
−120
−100
−80
−60
−40
−20
0
frequency (Normalized to Fs
ext
)
Magnitude (dB)
SRC filter complete magnitude response
Figure 53. ASRC Frequency Response
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
−0.1
−0.08
−0.06
−0.04
−0.02
0
0.02
0.04
frequency (Normalized to Fs
ext
)
Magnitude (dB)
SRC filter passband magnitude response
Figure 54. ASRC Passband Frequency Response