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WM8978CGEFL/V Datasheet(PDF) 111 Page - Wolfson Microelectronics plc

No. de pieza WM8978CGEFL/V
Descripción Electrónicos  Stereo CODEC with Speaker Driver
PDF  118 Pages
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Fabricante Electrónico  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8978CGEFL/V Datasheet(HTML) 111 Page - Wolfson Microelectronics plc

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Production Data
WM8978
w
PD, Rev 4.5, October 2011
111
5-BAND EQUALISER
The WM8978 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.
The plots from Figure 58 to Figure 71 show the frequency responses of each filter with a sampling
frequency of 48kHz, firstly showing the different cut-off/centre frequencies with a gain of
12dB, and
secondly a sweep of the gain from -12dB to +12dB for the lowest cut-off/centre frequency of each
filter.
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
Figure 58 EQ Band 1 Low Frequency Shelf Filter Cut-offs
Figure 59 EQ Band 1 Gains for Lowest Cut-off Frequency
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
Figure 60 EQ Band 2 – Peak Filter Centre Frequencies,
EQ2BW=0
Figure 61
EQ Band 2 – Peak Filter Gains for Lowest Cut-off
Frequency, EQ2BW=0
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
-15
-10
-5
0
5
10
15
Frequency (Hz)
Figure 62 EQ Band 2 – EQ2BW=0, EQ2BW=1



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