參數資料
型號: AK4113
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 192KHZ 24BIT DIR WITH 6:1 SELECTOR
中文描述: 192kHz 24位處長與6:1選擇器
文件頁數: 19/49頁
文件大?。?/td> 531K
代理商: AK4113
ASAHI KASEI
[AK4113]
MS0349-E-01
2005/03
- 19 -
The pre-emphasis information is detected and reported on PEM bit. This information is extracted from channel 1 by
default. It can be switched to channel 2 by the CS12 bit in control register.
PEM bit
Pre-emphasis
Byte 0
Bits 3-5
0X100
0X100
0
1
Table 6. PEM in Consumer Mode
OFF
ON
PEM bit
Pre-emphasis
Byte 0
Bits 2-4
110
110
0
1
Table 7. PEM in Consumer Mode
OFF
ON
De-emphasis Filter Control
The AK4113 includes a digital de-emphasis filter (tc=50/15
μ
s). This is an IIR filter that corresponds to four sampling
frequencies (32kHz, 44.1kHz and 48kHz). When DEAU bit=“1”, the de-emphasis filter is enabled automatically by the
sampling frequency and pre-emphasis information in the channel status. The AK4113 is in this mode by default. In
parallel control mode, the AK4113 is always placed in this mode and the status bits in channel 1 control the de-emphasis
filter. In serial control mode, DEM1-0 bits control the de-emphasis filter when the DEAU is “0”. The internal
de-emphasis filter is bypassed and the recovered data is available without any change if the de-emphasis mode is OFF.
When the PEM bit is “0”, the internal de-emphasis filter is always bypassed.
PEM bit
FS3 bit
FS2 bit
FS1 bit
1
0
0
0
1
0
0
1
1
0
0
1
1
(Others)
0
x
x
x
Table 8. De-emphasis Auto Control at DEAU bit = “1” (Default)
PEM bit
DEM1 bit
DEM0 bit
1
0
0
1
0
1
1
1
0
1
1
1
0
x
x
Table 9. De-emphasis Manual Control at DEAU bit = “0”
FS0 bit
0
0
1
Mode
44.1kHz
48kHz
32kHz
OFF
OFF
x
Mode
44.1kHz
OFF
48kHz
32kHz
OFF
Default
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