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參數(shù)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(shù)： | 12/40頁 |
| 文件大?。?/td> | 181K |
| 代理商： | UDA1331H |
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1998 Oct 06
12
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) Audio
Playback Peripheral (APP)
UDA1331H
Table 3
Volume control characteristics
wVOLUME
VOLUME USB SIDE
(dB)
VOLUME USB APP
(dB)
B15
B14
B13
B12
B11
B10
B9
B8
0
1
1
1
1
1
1
1
1
1
1
...
1
1
1
1
...
1
0
1
1
1
1
1
1
1
1
1
1
...
1
1
1
1
...
0
0
1
1
1
1
1
1
1
1
1
1
...
0
0
0
0
...
0
0
1
1
1
1
1
1
1
1
1
1
...
0
0
0
0
...
0
0
1
1
1
1
1
1
1
1
0
0
...
0
0
0
0
...
0
0
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
1
0
1
0
1
0
1
0
1
0
...
1
0
1
0
...
0
0
1
2
3
4
5
6
7
8
9
10
...
59
60
61
62
...
∞
0
1
2
3
4
5
6
7
8
9
10
...
59
60
∞
∞
...
∞
M
UTE CONTROL
Mute is one of the sound features as defined in the “USB
Device Class Definition for Audio Devices” The mute
control request data
bMute
controls the position of the
mute switch. The position can be either on or off. When
bMute
is true the feature unit is muted. When
bMute
is
false the feature unit is not muted.
When the mute is active for the master channel, the value
of the sample is decreased smoothly to zero following a
raised cosine curve. There are 32 coefficients used to step
down the value of the data, each one being used 32 times
before stepping to the next.
This amounts to a mute transition of 23 ms at
f
s
= 44.1 kHz. When the mute is released, the samples are
returned to the full level again following a raised cosine
curve with the same coefficients being used in reversed
order. The mute, on the master channel is synchronized to
the sample clock, so that operation always takes place on
complete samples.
A mute can be given via the host or by pressing a
predefined GP pin.
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