參數(shù)資料
型號(hào)： TDA9875AH/V2,557
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, QFP
文件頁(yè)數(shù)： 8/96頁(yè)
文件大小： 324K
代理商： TDA9875AH/V2,557
1999 Dec 20
16
Philips Semiconductors
Product specication
Digital TV Sound Processor (DTVSP)
TDA9875A
6.2.13
EXPERT MODE
The TDA9875A provides a special expert mode that gives
direct write access to the internal Coefficient RAM (CRAM)
of the DSP. It can be used to create user-defined
characteristics, such as a tone control with different corner
frequencies or special boost/cut characteristics to correct
the low-frequency loudspeaker and/or cabinet frequency
responses by means of the bass boost filter. However, this
mode must be used with great care.
More information on the functions of this device, such as
the number of coefficients per function, their default
values, memory addresses, etc., can be made available
on request.
6.2.14
DSP FUNCTIONS
Table 5
Overview of DSP functions
FUNCTION
EXPERT
MODE
PARAMETER
VALUE
UNIT
Bass control for loudspeaker and
headphone output
yes
control range
12 to +15
dB
resolution
1
dB
resolution at frequency
40
Hz
Treble control for loudspeaker and
headphone output
yes
control range
12 to +12
dB
resolution
1
dB
resolution at frequency
14
kHz
Contour for loudspeaker output
yes
control range
0 to +18
dB
resolution
1
dB
resolution at frequency
40
Hz
Bass boost for loudspeaker output
yes
control range
0 to +20
dB
resolution
2
dB
resolution at frequency
20
Hz
corner frequency
350
Hz
Volume control for each separate
channel in loudspeaker and
headphone output
no
control range
83 to +24
dB
resolution
1
dB
mute position at step
1010 1100
Soft mute for loudspeaker and
headphone output
no
processing time
32
ms
Spatial effects
yes
anti-phase crosstalk positions
30, 40 and 52
%
Pseudo stereo
yes
90 degrees phase shift at frequency
150, 200 and 300
Hz
Beeper additional to the signal in
the loudspeaker and headphone
channel
yes
beep frequencies
see Section 10.3.38
control range
0 to
93
dB
resolution
3
dB
mute position at step
0010 0000
Automatic Volume Level (AVL)
yes
step width
quasi continuously
AVL output level for an input level
between 0 and
29 dB (full-scale)
23
dB
attack time
10
ms
decay time constant
2, 4 and 8
s
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