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參數資料
| 型號： | AP8111 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TruBass Audio Enhancement Processor |
| 中文描述： | TruBass音頻增強處理器 |
| 文件頁數： | 3/6頁 |
| 文件大小： | 457K |
| 代理商： | AP8111 |
P
A
ASP
AP8111
4 Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
28
27
26
25
24
23
22
21
20
19
18
17
LOUT
LIN
VREF
CB1A
CB1B
CB1
GND
CB2B
CB2A
CB2
BYPASS
COMPI
CL1
FOUT
COMPC2
VCC
COMPC1
CB3B
CB3A
CB3
CL2B
CL2A
RIN
ROUT
1
13
14
16
15
TBGAIN
NC
NC
NC
5 Operating Modes
The chip can be configured in 3 modes of operations – Power down mode, bypass mode, TruBass mode.
In power down mode, the chip is power down and consumed minimal current.
In bypass mode, line in audio signal is pass directly to the output.
In TruBass mode, line in audio signal is enhanced with the TruBass algorithm.
The
Bypass
pin (pin 11) is used to select the operating mode. When the pin is forced to 0v, the chip is powered down and when
the pin is at float (or Vcc/2) and at 5v, the mode is set to Bypass and TruBass Enabled respectively.
An additional +6dB gain is enabled by pulling the pin TBGAIN to ground.
6 Speaker Size and Filter Center Frequencies selection
The configuration of the TruBass band-pass filters depends on the speaker size for the system. There are three configurations:
small, medium and large. Each configuration uses three bandpass filters, but with different center frequencies for the filters as
follows:
Speaker Size
Filter Center Frequencies
Small
100Hz
Medium
60Hz
Large
40Hz
The low pass filter cutoff frequency and the band pass filter center frequencies can be adjusted to match the frequency response of
the speakers being used. Generally, the speaker size setting should be selected so that the lowest of the band pass center
frequencies is just above the low cutoff frequency of the speaker system.
All configurations require the 100Hz filter, so its center frequency is fixed. The center frequencies of the other two filters are
configured by the external resistors placed on pins CB2, CB2A, CB2B, CB3, CB3A, CB3B.
Revision 2.4
15 April., 2002
3
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