參數(shù)資料
型號(hào)： TDA9875
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital TV Sound Processor DTVSP
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP64
文件頁(yè)數(shù)： 15/92頁(yè)
文件大小： 279K
代理商： TDA9875
1998 Feb 13
15
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
6.2.13
E
XPERT MODE
The TDA9875 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 filter structures, the number of coefficients per function, their
default values, memory addresses, etc., can be made available on request.
6.2.14
DSP
CHARACTERISTICS
Table 5
DSP characteristics
FUNCTION
EXPERT
MODE
PARAMETER
VALUE
UNIT
Bass control for loudspeaker and
headphone output
yes
control range
step resolution
step resolution at frequency
control range
step resolution
step resolution at frequency
control range
step resolution
step resolution at frequency
control range
step resolution
step resolution at frequency
corner frequency
control range
step resolution
mute position at step
processing time
12 to +15
1
40
12 to +12
1
14
0 to +18
1
40
0 to +20
2
20
350
83 to +24
1
10101100
32
dB
dB
Hz
dB
dB
kHz
dB
dB
Hz
dB
dB
Hz
Hz
dB
dB
Treble control for loudspeaker
and headphone output
yes
Contour for loudspeaker output
yes
Bass boost for loudspeaker
output
yes
Volume control for each separate
channel in loudspeaker and
headphone output
no
Soft-mute for loudspeaker and
headphone output
Spatial effects
Pseudo stereo
Beeper additional to the signal in
the loudspeaker and headphone
channel
no
ms
yes
yes
anti-phase crosstalk positions
90 degree phase shift at frequency
beep frequencies
control range
step resolution
mute position at step
step width
AVL output level for an input level
between 0 dB and
29 dB (full-scale)
attack time
decay time constant
3 dB lower corner frequency of DSP 10
1 dB bandwidth of DSP
30, 40 and 52
150, 200 and 300
see Section 10.3.38
0 to
93
3
00100000
quasi continuously
23
%
Hz
yes
dB
dB
AVL
no
dB
10
2, 4 and 8
ms
s
Hz
kHz
General
no
14.5
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