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參數(shù)資料
| 型號： | TDA9870A |
| 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)： | 12/88頁 |
| 文件大?。?/td> | 362K |
| 代理商： | TDA9870A |
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1998 Aug 10
12
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
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 of
±
15 dB. 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
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
μ
s, 60
μ
s and 75
μ
s).
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.
6.2.3
M
ONITOR
This function provides data words from a number of
locations of 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.
6.2.4
L
OUDSPEAKER
(
MAIN
)
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 2nd-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
mute position. 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 volume control is identical to the
volume setting in dBs (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 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 dBs (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. The beeper
volume is adjustable with respect to full scale between
0 and
93 dB with 3 dB resolution. The beeper is not
effected by mute.
Soft mute provides a mute ability in addition to volume
control with a well defined time (32 ms) after which the soft
mute is completed. A smooth fading is achieved by a
cosine masking.
6.2.5
H
EADPHONE
(A
UXILIARY
)
CHANNEL
The matrix provides the following functions; forced mono,
stereo, channel swap, channel 1 and channel 2
(or C and S in Dolby Surround Pro Logic mode).
Volume is controlled individually for each channel in a
range from +24 to
83 dB with 1 dB resolution. There is
also a mute position.
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相關代理商/技術參數(shù) |
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| TDA9873 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard dual carrier stereo sound decoder |
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| TDA9873HS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard dual carrier stereo sound decoder |
| TDA9874A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
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