參數(shù)資料
型號(hào)： AK4588VQ
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 2/8 CHANNEL AUDIO CODEC WITH DIR
中文描述： 2 / 8聲道音頻編解碼器迪爾
文件頁數(shù)： 45/76頁
文件大?。?/td> 787K
代理商： AK4588VQ
ASAHI KASEI
[AK4588]
MS0287-E-01
2004/03
- 45 -
Sampling Frequency and Pre-emphasis Detection
The AK4588 has two methods for detecting the sampling frequency as follows.
1. Clock comparison between recovered clock and X’tal oscillator
2. Sampling frequency information on channel status
Those could be selected by XTL1, 0 bits. And the detected frequency is reported on FS3-0 bits.
XTL1
XTL0
0
0
0
1
1
0
1
1
X’tal Frequency
11.2896MHz
12.288MHz
24.576MHz
(Use channel status)
Default
Table 19. Reference X’tal frequency
Except XTL1,0= “1,1”
XTL1,0= “1,1”
Register output
fs
Consumer
mode
(Note 2)
Byte3
Bit3,2,1,0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
( 1 0 0 0 )
( 1 0 1 0 )
( 1 1 0 0 )
( 1 1 1 0 )
Professional mode
FS3
FS2
FS1
FS0
Clock comparison
(Note 1)
Byte0
Bit7,6
0 1
Byte4
Bit6,5,4,3
0 0 0 0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
0
0
44.1kHz
Reserved
48kHz
32kHz
88.2kHz
96kHz
176.4kHz
192kHz
44.1kHz
Reserved
48kHz
32kHz
88.2kHz
96kHz
176.4kHz
192kHz
(Others)
1 0
1 1
0 0
0 0
0 0
0 0
0 0 0 0
0 0 0 0
1 0 1 0
0 0 1 0
1 0 1 1
0 0 1 1
Note1: At least
±
3% range is identified as the value in the Table 20. In case of intermediate frequency of those two,
FS3-0 bits indicate nearer value. When the frequency is much bigger than 192kHz or much smaller than
32kHz, FS3-0 bits may indicate “0001”.
Note2: When consumer mode, Byte3 Bit3-0 are copied to FS3-0 bits.
Table 20. fs Information
The pre-emphasis information is detected and reported on PEM bit. These information are extracted from channel 1 at
default. It can be switched to channel 2 by CS12 bit in control register.
PEM
Pre-emphasis
Byte 0
Bits 3-5
≠
0X100
0X100
0
1
OFF
ON
Table 21. PEM in Consumer Mode
PEM
Pre-emphasis
Byte 0
Bits 2-4
≠
110
110
0
1
OFF
ON
Table 22. PEM in Professional Mode
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