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參數(shù)資料
| 型號： | SAA7715H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Digital Signal Processor |
| 中文描述： | 24.576 MHz, OTHER DSP, PQFP44 |
| 封裝： | 10 X 10 X 1.75 MM, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大?。?/td> | 180K |
| 代理商： | SAA7715H |
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2001 May 07
20
Philips Semiconductors
Preliminary specification
Digital Signal Processor
SAA7715H
Table 16
Default settings of I
2
C-bus registers after power-up and reset
9.9
Table definitions
Table 17
Digital serial format for inputs 1 to 4
Table 18
Digital serial formats for outputs 1 to 4
I
2
C-BUS ADDRESS
DEFAULT VALUE
602FH
0FFBH
0FF5H
0FF4H
0FF3H
0FF2H
0050C6H
0010DBH
000000H
000000H
000000H
000000H
FORMAT_IN 1, 2 AND 3
OUTPUT
BIT 2
BIT 1
BIT 0
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
standard I
2
S-bus
LSB-justified, 16 bits
LSB-justified, 18 bits
LSB-justified, 20 bits
LSB-justified, 24 bits
FORMAT_OUT
OUTPUT
BIT 2
BIT 1
BIT 0
0
1
1
1
1
0
0
0
1
1
0
0
1
0
1
standard I
2
S-bus
LSB-justified, 16 bits
LSB-justified, 18 bits
LSB-justified, 20 bits
LSB-justified, 24 bits
10 SOFTWARE IN ROM DESCRIPTION
10.1
Audio dynamics compressor
10.1.1
T
HEORY OF OPERATION
The objective of a dynamics compressor is to reduce the
dynamic range of the input signal for purposes of
accommodatingdownstreamdevices,orsimplytogivethe
audio signal a different character. Early compressors were
used primarily for limiting signals destined for recording on
media with limited dynamic range. In the present day,
compressors are routinely used in recording studios and in
live performances to enhance the presence of various
signals.
The behaviour of a dynamics compressor is very similar to
that of an Automatic Gain Control (AGC), the central idea
being to scale the input signal by a slowly varying gain
factor that is in turn regulated by the level of the input
signal. The essential concepts are summed up nicely by
Fig.7. Here we observe that when the input level exceeds
a selected threshold, gain reduction is brought to bear
according to the selected compression ratio, while signals
appearing below the threshold are passed with unity gain.
The net effect, therefore, is to compress the louder
passages of source material.
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