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WM8978GEFL/V データシート(PDF) 72 Page - Wolfson Microelectronics plc

部品番号 WM8978GEFL/V
部品情報  STEREO CODEC WITH SPEAKER DRIVER
PDF  78 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8978GEFL/V データシート(HTML) 72 Page - Wolfson Microelectronics plc

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WM8978
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PP Rev 1.7 January 2005
72
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 41 to Figure 54 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 41 EQ Band 1 Low Frequency Shelf Filter Cut-offs
Figure 42 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 43 EQ Band 2 – Peak Filter Centre Frequencies,
EQ2BW=0
Figure 44
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 45 EQ Band 2 – EQ2BW=0, EQ2BW=1



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