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參數(shù)資料
| 型號： | TDA9875 |
| 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 |
| 文件頁數(shù)： | 13/92頁 |
| 文件大?。?/td> | 279K |
| 代理商： | TDA9875 |
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1998 Feb 13
13
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
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
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
μ
s, 60
μ
s, 75
μ
s and J17).
An adaptive de-emphasis is available for
Wegener-Panda 1 encoded programs.
A matrix 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.
6.2.4
NICAM
AUTO
-
MUTE
If NICAM is received and the signal quality becomes poor,
the digital crossbar switch switches automatically to FM
and switches the matrix to channel 1. The automatic
switching between NICAM and channel 1 (FM or AM)
reception depends on the NICAM bit error rate.
The auto-mute function can be disabled via the I
2
C-bus.
6.2.5
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 inputs to the loudspeaker channel
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
(
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 dBFS and
29 dB full-scale. There are some
fixed decay time constants to choose from, i.e. 2, 4 and
8 seconds.
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 dB 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 dB and +18 dB with 1 dB
resolution.
Bass is adjustable between +15 dB 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 dB and
93 dB with a 3 dB step resolution. The beeper
is not effected by mute.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9875A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875AH/V2,557 | 功能描述:IC SOUND PROC DGTL TV 64QFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| 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 |
| TDA9880T | 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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