CXA1720Q
Filter Customization Selections/Combinations
In filter settings, use the LPF cut-off frequency fC1 in 1M/outer track mode as 1.00 as shown in Table 1 to
select fc ratios and LPF types for the other three modes. The 1M/outer track to 2M/outer track modes for the
LPF are fixed to Butterworth, while either Butterworth or Chebyshev 1 dB ripple can be selected in 2M/inner
track mode.
Note that the BPF center frequency foB is fixed at 1.2 times the LPF cut-off frequency fc. In addition, the
relationship between the peak frequencies fo and fc in regards to the comprehensive characteristics is as
follows, depending on differences in LPFs.
Butterworth characteristics:
fC = 1.28fo
fC = 1.12fo
Chebyshev 1 dB ripple characteristics:
Table 1 LPF fc Ratios and Types
Mode
LPF type
fc ratio when fc1 is assumed as 1.00
1M/outer track
Butterworth
Butterworth
Butterworth
1.00
1.07
1.60
1.14
2.00
1.23
1.33
1.45
1M/inner track
2M/outer track
2M/inner track
1.33
1.68
2.29
1.33
1.68
2.29
1.39
1.78
2.46
1.39
1.78
2.46
1.45
1.88
2.67
1.45
1.88
2.67
1.52
2.00
1.60
2.13
Butterworth
Chebyshev
(1 dB ripple)
1.52
2.00
1.60
2.13
Note) The boxed item indicates the setting for the CXA1720Q.
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SONY [ SONY CORPORATION ]
