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PDF SAA7710T Data sheet ( Hoja de datos )
| Número de pieza | SAA7710T | |
| Descripción | Dolby* Pro Logic Surround; Incredible Sound | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
SAA7710T
Dolby* Pro Logic Surround;
Incredible Sound
Product specification
Supersedes data of 1997 Oct 03
File under Integrated Circuits, IC01
1998 Mar 13
1 page  
Philips Semiconductors
Dolby* Pro Logic Surround;
Incredible Sound
Product specification
SAA7710T
FUNCTIONAL DESCRIPTION
Figure 1 shows the block diagram of the SAA7710T.
The SAA7710T consists of a Dolby Pro Logic decoder
together with equalizer or tone control. The Dolby Pro
Logic part of the IC may be used to decode audio
soundtracks (Dolby surround movies or Dolby surround
video productions) from for example, a video recorder
(VCR) or a CD laser disc into four channels Left, Centre,
Right and Surround (L, C, R and S).
If desired, post-processing with either an equalizer or a
tone control section is possible. In addition to this, a Sub
Woofer (SW) channel, digital volume control and a
user-programmable variable output matrix are
implemented.
Hall/matrix surround sound functions are implemented for
material not encoded using Dolby Surround. These
features can be used as an alternative to Dolby Pro Logic
and can also be combined with the equalizer or tone
control sections.
Incredible sound is a Philips patented technology which
substantially improves the stereo effect of a television or
audio system. Using advanced signal processing,
speakers that are positioned close together can imitate the
sound produced by speakers that are far apart.
Functional modes
The device thus supports three main modes, Dolby Pro
Logic/Dolby 3 stereo or hall/matrix surround or Incredible
sound mode. All modes can be combined with equalizing
(3-band or 5-band) or tone control depending on fs and
available cycle budget.
THE DOLBY PRO LOGIC MODE
In Dolby Pro Logic mode, several blocks must be initialized
and controlled during operation:
• Noise generator and noise sequencer
• Centre channel mode(1) (normal, phantom, wide, off)
• Combining network coefficients
• 7 kHz low-pass filter in surround channel(1)
• Surround channel delay time(1)
• Modified Dolby B noise reduction must be on.
Possible post-processing modes for Dolby Pro Logic are:
• Volume control only
(1) The coefficient set used to initialize and control the operation
of the Dolby Pro Logic mode depends upon the selected
sampling frequency fs = 32, 44.1 or 48 kHz.
• Equalizer (3- or 5-band on L, C and R) or tone control
(L, C, R and S); fixed output matrix(1); volume control
• Equalizer (5-band on L, C and R); variable output
matrix(1); volume control
• Extra sub woofer(1).
THE DOLBY 3 STEREO MODE
In Dolby 3 stereo mode, several blocks must be initialized
and controlled during operation:
• Noise generator and noise sequencer
• Centre channel mode(1) (normal, phantom, wide and off)
• Combining network coefficients
• Incredible Sound widening of the stereo base on two
speakers
• Effect is user adjustable.
THE HALL/MATRIX SURROUND MODE
In hall/matrix surround mode, the blocks listed below must
be initialized and controlled during operation:
• Input balance control
• Hall or matrix surround Mode setting
• All-pass and filter transfer characteristics(1)
• 7 kHz low-pass filter in surround channel(1)
• Surround channel delay(1).
Possible post-processing modes for hall/matrix surround
are as above:
• Volume control only
• Equalizer (5-band on L, C and R) or tone control
(L, C, R and S); fixed output matrix(1); volume control
• Equalizer (5-band on L,C,R); variable output matrix(1);
volume control
• Extra sub woofer(1).
THE INCREDIBLE SOUND MODE
In the Incredible sound mode the blocks listed below must
be initialized and controlled during operation:
• Incredible sound coefficients
• Combining network coefficients.
Possible post-processing modes for incredible sound are
as follows:
• Volume control only
• Equalizer (5-band on L and R) or tone control (L and R);
variable output matrix(1), volume control
• Extra sub-woofer(1).
1998 Mar 13
5
5 Page 
Philips Semiconductors
Dolby* Pro Logic Surround;
Incredible Sound
Product specification
SAA7710T
andbook, full pagewidth
SDA
SCL
S
START condition
P
STOP condition
MLC161
Fig.8 START and STOP conditions.
handbook, full pagewidth
SDA
MSB
SCL
1
S
START condition
2
acknowledgement
signal from receiver
byte complete
interrupt within receiver
clock line held LOW while
interrupts are serviced
acknowledgement
signal from receiver
78 9
ACK
12
3 to 8
9
P
STOP condition
MLC162
1998 Mar 13
Fig.9 Data transfer on the I2C-bus.
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet SAA7710T.PDF ] | |
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