參數(shù)資料
型號(hào)： AK5370VF
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： JT 6C 6#12 SKT GRND PLUG
中文描述： 我的USB /英格蘭/ D轉(zhuǎn)換器
文件頁數(shù)： 20/27頁
文件大小： 203K
代理商： AK5370VF
ASAHI KASEI
[AK5370]
MS0027-E-00
20
2000/05
6. Device specific requests
AKM USB Microphone supports ONLY SET_CUR as bRequest field in Set Request Values.
6.1 Audio Control Request
AKM USB microphone support ONLY Feature Unit Control Request, not support other requests.
Addition to this, it only supports SET_CUR value as bRequest field in Set Feature Unit Control
Request Values. All Audio Control Requests are applied to channel 0, which means master
channel.
6.1.1 Set Feature Unit Control Request
AKM USB Microphone supports only one form of parameter block.
a) Mute Control
Offset
Field
Size
Value
0
bmRequestType
1
0x21
1
bRequest
1
0x01
2
wValue
2
0x0100
4
wIndex
2
0x0300
Description
SET_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
The parameter block of mute control is the following.
Offset
Field
0
bMute
wLength
2
0x0001
Size
1
Value
0x01
0x00
Description
TRUE
FALSE
b) Volume Control
Offset
0
1
2
4
Field
bmRequestType
bRequest
wValue
wIndex
Size
1
1
2
2
Value
0x21
0x01
0x0200
0x0300
Description
SET_CUR
VOLUME_CONTROL | CHANNEL_0
Upper Byte : bUnit ID field in Feature Unit
Descriptor.(0x03)
Lower Byte : Audio Control Interface(0x00)
Volume Control
6
The parameter block of mute control is the following.
Offset
Field
0
wVolume
wLength
2
0x0002
Size
2
Value
0xZZZZ
Description
The value is mapped to the volume register value.
(refer to Figure 3 conversion table )
ZZZZ is assigned by the host
If the wVolume exceeds the range, the AK5370 forces the value into the range. Please see the
conversion table in the Get Feature Unit Control Request.
c) Automatic Gain Control
Offset
Field
Size
Value
0
bmRequestType
1
0x21
1
bRequest
1
0x01
2
wValue
2
0x0700
4
wIndex
2
0x0300
Description
SET_CUR
AUTOMATIC_GAIN_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
The parameter block of mute control is the following.
Offset
Field
0
bAGC
wLength
2
0x0001
Size
1
Value
0x01
0x00
Description
TRUE (AGC pin is H)
FALSE (AGC pin is L: Default)
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