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參數(shù)資料
| 型號(hào)： | TDA9874H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Digital TV sound demodulator/decoder |
| 中文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | 14 X 14 MM, 2.20 MM HEIGHT, PLASTIC, SOT-205-1, QFP-44 |
| 文件頁數(shù)： | 12/56頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
12
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
6.2
Description of the DSP
6.2.1
L
EVEL SCALING
All input channels to the digital crossbar switch are
equipped with a level adjust facility to change the signal
level in a range of
±
15 dB. Adjusting the signal level is
intended to compensate for the different modulation
parameters of the various TV standards. It is
recommended to scale all input channels to be 15 dB
below full-scale (
15 dB (FS)) under nominal conditions.
This will create sufficient headroom to cope with
overmodulation and avoids changes of the volume
impression when switching from FM to NICAM or vice
versa.
6.2.2
NICAM
PATH
The NICAM path has a switchable J17 de-emphasis.
6.2.3
NICAM
AUTO
-
MUTE
If NICAM is received, the AUTO-MUTE is enabled and the
signal quality becomes poor, the digital crossbar switches
automatically to FM, Channel 1 or the analog mono input,
as selected by bit AMSEL. This automatic switching
depends on the NICAM bit error rate. The auto-mute
function can be disabled via the I
2
C-bus.
6.2.4
FM (AM)
PATH
A high-pass filter suppresses DC offsets from the
FM demodulator that may occur due to carrier frequency
offsets and supplies the FM monitor function with DC
values, e.g. for the purpose of microprocessor controlled
carrier search or fine-tuning functions.
An adaptive de-emphasis is available for
Wegener-Panda 1 encoded satellite programs.
The de-emphasis stage offers a choice of settings for the
supported TV standards.
The 2 channel decoder performs the dematrixing of
1
2
(L + R) and R to L and R signals, of
1
2
(L + R) and
1
2
(L
R) to L and R signals or of Channel 1 and
Channel 2 to L and R signals, as demanded by the
different TV standards or user preferences.
6.2.5
FM
MONITOR
This function provides data words from the
FM demodulator outputs and FM and NICAM signals for
external use, like carrier search or fine tuning. Source
selection and data read-out are performed via the I
2
C-bus.
6.2.6
D
IGITAL CROSSBAR SWITCH
Input channels come from the FM and NICAM paths, while
output channels comprise I
2
S and the audio DACs to the
analog crossbar switch. Note that there is no connection
from the external analog audio inputs to the digital
crossbar switch.
6.2.7
D
IGITAL AUDIO OUTPUT
The digital audio output interface comprises an I
2
S output
port and a system clock output. The I
2
S port is equipped
with a level adjust facility that can change the signal level
in a
±
15 dB range in 1 dB steps. Muting is possible, too,
and outputs can be disabled to improve EMC
performance.
The I
2
S-bus output matrix provides the functions of forced
mono, stereo, channel swap, Channel 1 or Channel 2.
6.2.8
C
HANNEL TO THE ANALOG CROSSBAR PATH
A level adjust function is provided with control positions
0 dB, +3 dB, +6 dB and +9 dB in combination with the
audio DACs.
6.2.9
G
ENERAL
The level adjust functions can provide signal gain at
multiple locations. Great care has to be taken when using
gain with large input signals, e.g., due to overmodulation,
in order not to exceed the maximum possible signal swing,
which would cause severe signal distortion. The nominal
signal level of the various signal sources to the digital
crossbar switch should be 15 dB below digital full-scale,
i.e.,
15 dB (FS).
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相關(guān)代理商/技術(shù)參數(shù) |
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| TDA9875 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
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| TDA9875AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
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| TDA9880 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Alignment-free multistandard vision and FM sound IF-PLL demodulator |
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