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)： 14/92頁
文件大?。?/td> 279K
代理商： TDA9875
1998 Feb 13
14
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
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.
6.2.7
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. 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.
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 bass or treble is identical to the new
bass or treble setting in dB (e.g. the I
2
C-bus data byte +8
sets the new value to +8 dB).
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.
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.
6.2.8
F
EATURE INTERFACE
The feature interface comprises two I
2
S-bus input/output
ports and a system clock output. Each I
2
S-bus port is
equipped with level adjust facilities that can change the
signal level in a
±
15 dB range in 1 dB steps. Outputs can
be disabled to improve EMC performance.
The I
2
S-bus output matrix provides the following functions;
forced mono, stereo, channel swap, channel 1 and
channel 2.
One example of how the feature interface can be used in
a TV set is to connect an external Dolby Surround Pro
Logic DSP, such as the SAA7710, to the I
2
S-bus ports.
Outputs must be enabled and a suitable master clock
signal for the DSP can be taken from pin SYSCLK.
A stereo signal from any source will be output on one of
the I
2
S-bus serial data outputs and the four processed
signal channels will be entered at both I
2
S-bus serial data
inputs. Left and right could then be output to the power
amplifiers via the Main channel, centre and surround via
the Auxiliary channel.
6.2.9
C
HANNEL FROM THE AUDIO ANALOG
-
TO
-
DIGITAL
CONVERTER
The signal level at the output of the ADC can be adjusted
in a range of
±
15 dB with a 1 dB step resolution. The audio
ADC itself is scaled to a gain of
6 dB.
6.2.10
C
HANNEL TO THE ANALOG CROSSBAR PATH
Level adjust with control positions 0 dB, +3 dB, +6 dB
and +9 dB.
6.2.11
D
IGITAL CROSSBAR SWITCH
(
SEE
Fig.6)
Input channels to the crossbar switch are from the audio
ADC, I
2
S1, I
2
S2, FM path, NICAM path and from the
loudspeaker channel path after matrix and AVL.
Output channels comprise loudspeaker, headphone, I
2
S1,
I
2
S2 and the audio DACs for line output and SCART.
The I
2
S1 and I
2
S2 outputs also provide digital outputs from
the loudspeaker and headphone channels, but without the
beeper signals.
6.2.12
G
ENERAL
There are a number of functions that can provide signal
gain, e.g. volume, bass and treble control. Great care has
to be taken when using gain with large input signals 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
(
15 dB full-scale). This means that a volume setting of,
say, +15 dB would just produce a full-scale output signal
and not cause clipping, if the signal level is nominal.
Sending illegal data patterns via the I
2
C-bus will not cause
any changes of the current setting for the volume, bass,
treble, bass boost and level adjust functions.
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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
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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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