參數(shù)資料
型號： TDA9875A
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： Digital TV Sound Processor DTVSP
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP64
封裝： SHRINK, PLASTIC, DIP
文件頁數(shù)： 14/96頁
文件大小： 296K
代理商： TDA9875A
1999 Dec 20
14
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9875A
6.2.1
L
EVEL SCALING
All input channels to the digital crossbar switch (except for
the loudspeaker feedback path) are equipped with a level
adjust facility to change the signal level in a range from
+15 to
15 dB (see Fig.5). It is recommended to scale all
input channels to be 15 dB below full-scale (
15 dB
full-scale) under nominal conditions.
6.2.2
NICAM
PATH
The NICAM path has a switchable J17 de-emphasis.
6.2.3
FM (AM)
PATH
A high-pass filter suppresses DC offsets from the
FM demodulator due to carrier frequency offsets and
supplies the monitor/peak function with DC values and an
unfiltered signal, e.g. for the purpose of carrier detection.
The de-emphasis function offers fixed settings for the
supported standards (50, 60 or 75
μ
s and J17).
An adaptive de-emphasis is available for
Wegener-Panda 1 encoded programs.
A matrix performs the dematrixing of the A2 stereo, dual
and mono signals.
6.2.4
NICAM
AUTO
-
MUTE
If NICAM B/G, I or D/K is received, the auto-mute is
enabled and the signal quality becomes poor, the digital
crossbar switch switches automatically to FM and
switches the matrix to channel 1. The automatic switching
depends on the NICAM bit error rate.
The auto-mute function can be disabled via the I
2
C-bus.
For NICAM L applications, it is recommended to
demodulateAMsoundinthefirstsoundIFandconnectthe
audio signal to the mono input of the TDA9875A.
By setting bit AMSEL (see Section 10.3.11), the
auto-mute function will switch to the audio ADC instead of
switching to the first sound carrier. The ADC source
selector bits (see Section 10.3.20) should be set to mono
input, where the AM sound signal should be connected.
6.2.5
M
ONITOR
This function provides data words from a number of
locations in the signal processing paths to the I
2
C-bus
interface (2 data bytes). Signal sources include the
FM demodulator outputs, most inputs to the digital
crossbar switch and the outputs of the ADC. Source
selection and data read-out is performed via the I
2
C-bus.
Optionally, the peak value can be measured instead of
simply taking samples. The internally stored peak value is
reset to zero when the data is read via the I
2
C-bus.
The monitor function may be used, for example, for signal
level measurements or carrier detection.
6.2.6
L
OUDSPEAKER
(M
AIN
)
CHANNEL
The matrix provides the following functions: forced mono,
stereo, channel swap, channel 1, channel 2 and spatial
effects.
There are fixed coefficient sets for spatial settings of 30%,
40% and 52%.
The Automatic Volume Level (AVL) function provides a
constant output level of
23 dB (full-scale) for input levels
between 0 and
29 dB (full-scale). There are some fixed
decay time constants to choose from, i.e. 2, 4 and 8 s.
Pseudo stereo is based on a phase shift in one channel via
a second-order all-pass filter. There are fixed coefficient
sets to provide 90 degrees phase shift at frequencies of
150, 200 and 300 Hz.
Volume is controlled individually for each channel ranging
from +24 to
83 dB with 1 dB resolution. There is also a
muteposition. Forthepurpose of asimplecontrolsoftware
in the microcontroller, the decimal number that is sent as
an I
2
C-bus data byte for volume control is identical to the
volume setting in dB (e.g. the I
2
C-bus data byte +10 sets
the new volume value to +10 dB).
Balance can be realized by independent control of the left
and right channel volume settings.
Contour is adjustable between 0 and +18 dB with 1 dB
resolution. This function is linked to the volume setting by
means of microcontroller software.
Bass is adjustable between +15 and
12 dB with 1 dB
resolution and treble is adjustable between
+12 and
12 dB with 1 dB resolution.
For the purpose of a simple control software in the
microcontroller, the decimal number that is sent as an
I
2
C-bus data byte for contour, bass or treble is identical to
the new contour, bass or treble setting in dB (e.g. the
I
2
C-bus data byte +8 sets the new value to +8 dB).
Extra bass boost is provided up to 20 dB with 2 dB
resolution. The implemented coefficient set serves merely
as an example on how to use this filter.
The beeper provides tones in a range from approximately
400 Hz to 30 kHz. The frequency can be selected via the
I
2
C-bus. The beeper output signal is added to the
loudspeaker and headphone channel signals.
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