TDA9875 Philips Semiconductors, TDA9875 Datasheet - Page 15

• Manufacturer Part Number: TDA9875
• Description: Digital TV Sound Processor DTVSP
• Manufacturer: Philips Semiconductors

Philips Semiconductors
6.2.13
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
Table 5 DSP characteristics
1998 Feb 13
Bass control for loudspeaker and
headphone output
Treble control for loudspeaker
and headphone output
Contour for loudspeaker output
Bass boost for loudspeaker
output
Volume control for each separate
channel in loudspeaker and
headphone output
Soft-mute for loudspeaker and
headphone output
Spatial effects
Pseudo stereo
Beeper additional to the signal in
the loudspeaker and headphone
channel
AVL
General
Digital TV Sound Processor (DTVSP)
E
DSP
XPERT MODE
FUNCTION
CHARACTERISTICS
EXPERT
MODE
yes
yes
yes
yes
yes
yes
yes
no
no
no
no
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
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
15
PARAMETER
1
40
1
14
0 to +18
1
40
0 to +20
2
20
350
1
10101100
32
30, 40 and 52
150, 200 and 300
see Section 10.3.38
0 to 93
3
00100000
quasi continuously
10
2, 4 and 8
14.5
12 to +15
12 to +12
83 to +24
23
VALUE
Preliminary specification
TDA9875
dB
dB
Hz
dB
dB
kHz
dB
dB
Hz
dB
dB
Hz
Hz
dB
dB
ms
%
Hz
dB
dB
dB
ms
s
Hz
kHz
UNIT