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參數(shù)資料
| 型號： | AK5371VQ |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | AB 5C 2#8 3#12 SKT WALL MT REC |
| 中文描述： | 2聲道的A / D轉(zhuǎn)換器的USB我/女 |
| 文件頁數(shù)： | 27/32頁 |
| 文件大小： | 256K |
| 代理商： | AK5371VQ |
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27
MS0103-E-00
MS0103-E-00
ASAHI KASEI
[AK 5371]
2001/06
5.1.2
AKM USB Microphone supports only one form of parameter block.
a) Mute Control
Offset
F ield
Size
0
bmRequestType
1
1
bRequest
1
2
wValue
2
4
wIndex
2
Get F eature Unit Control Request
Value
0xA1
0x81
0x0100
0x0300
Description
GET_CUR
MUTE_CONTROL | CHANNEL_0
Upper Byte : bUnit ID field in Feature Unit
Descriptor.(0x03)
Lower Byte : Audio Control Interface(0x00)
The Length of Mute Control Parameter Block
6
wLength
2
0x0001
The device outputs the current setting of mute status.
Offset
F ield
0
bMute
Size
1
Value
0x01
0x00
Description
TRUE
FALSE
b) Volume Control
Offset
0
1
F ield
bmRequestType
bRequest
Size
1
1
Value
0xA1
0x81
0x82
0x83
0x84
0x0201
0x0202
0x0300
Description
GET_CUR
GET_MIN
GET_MAX
GET_RES
VOLUME_CONTROL | CHANNEL_1
VOLUME_CONTROL | CHANNEL_2
Upper Byte : bUnit ID field in Feature Unit
Descriptor.(0x03)
Lower Byte : Audio Control Interface(0x00)
Volume Control
2
wValue
2
4
wIndex
2
6
wLength
2
0x0002
The parameter block of Volume Control is the following.
Offset
F ield
0
wVolume
Size
2
Value
0xZZYY
Description
bRequest = GET_CUR : returns current volume.
YY must be 00h
bRequest = GET_MIN : -31dB
bRequest = GET_MAX : +24dB
bRequest = GET_RES : 1.0dB
0xE100
0x1800
0x0100
Table 1 is the conversion map of USB class and internal volume register.
When host requests the volume value which is larger than the MAX value in the device, the device is set the MAX
value to the volume. When host requests the volume value which is smaller than the MIN value in the device, the
device is set the MIN value to the volume. RES value is 1.0dB.
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