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參數資料
| 型號： | UDA1331H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Universal Serial Bus USB Audio Playback Peripheral APP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, SOT-319-2, QFP-64 |
| 文件頁數： | 14/40頁 |
| 文件大小： | 181K |
| 代理商： | UDA1331H |
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1998 Oct 06
14
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) Audio
Playback Peripheral (APP)
UDA1331H
B
ASS CONTROL
The bass control is available for the master channel of the UDA1331H. Bass can be regulated in three modes: minimum,
flat and maximum mode. The preferred mode is selected at start-up of the device (configuration map). The Bass range
is from 0 to about 14 dB (minimum mode) or about 24 dB (maximum mode) in steps of 2 dB. It should be noted that the
negative bass values as defined in the “USB Device Class Definition for Audio Devices”are not supported by the
UDA1331H; the 0 dB value is returned as 0 dB. The maximum Bass value which will be reported to the host is always
24 dB independent of the mode. The maximum mode is the most accurate mode when the Bass values are reported to
the host. The corner frequency is 100 Hz for the minimum mode and 75 Hz for the maximum mode. Table 5 gives the
mapping of the
bBass
value upon the actual bass setting of the USB APP.
Table 5
Bass control characteristics
bBASS
BASS USB
SIDE (dB)
BASS USB APP (dB)
B7
B6
B5
B4
B3
B2
B1
B0
minimum
flat
maximum
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
...
5.25
...
7.25
...
9.25
...
11.25
...
13.25
...
15.25
...
17.25
...
0
0
0
1.1
0
1.7
2.4
0
3.6
0
0
0
1
0
1
0
1
3.7
0
5.4
0
0
0
1
1
1
0
1
5.2
0
7.4
0
0
1
0
0
1
0
1
6.8
0
9.4
0
0
1
0
1
1
0
1
8.4
0
11.3
0
0
1
1
0
1
0
1
10.2
0
13.3
0
0
1
1
1
1
0
1
11.9
0
15.2
0
1
0
0
0
1
0
1
13.7
0
17.3
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