WM8983 Wolfson Microelectronics Ltd., WM8983 Datasheet - Page 44

• Manufacturer Part Number: WM8983
• Description: The WM8983 is a low power, high quality stereo codec designed for portable multimedia applications. Highly flexible analogue mixing functions enable new application features, combining hi-fi quality audio with voice communication.
• Manufacturer: Wolfson Microelectronics Ltd.

The following example illustrates how to calculate the a0 and a1 coefficients for a desired centre frequency
and -3dB bandwidth.
w
w
w
a
a
0
1
0
b
×
=
=
=
=
1
1
−
2 π
2
π
−
+
1 (
f
f
tan(
tan(
b
c
+
/
/
a
f
f
0
s
w
w
s
)
b
b
cos(
/
/
2
2
≤
) 2
) 2
π
π
w
≤
0
1
1
)
−
+
tan(
tan(
−
. 0
. 0
1 ( +
0130899693
0130899693
. 0
9869949627
/ 9
/ 9
) 2
) 2
)
cos(
. 0
1308996939
)