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PDF DPL4519G Data sheet ( Hoja de datos )
| Número de pieza | DPL4519G | |
| Descripción | Sound Processor | |
| Fabricantes | Micronas | |
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MICRONAS
PRELIMINARY DATA SHEET
DPL 4519G
Sound Processor for
Digital and Analog
Surround Systems
Edition Oct. 31, 2000
6251-512-1PD
MICRONAS
1 page  
www.DaPtaRShEeLeItM4UI.NcoAmRY DATA SHEET
DPL 4519G
1.1. Features of the DPL 4519G
– 8-channel asynchonous I2S input interface (multichannel mode)
+ 2 synchronous I2S input channels (e.g. for MSP and ADR)
or
3 asynchronous two-channel I2S input interfaces
– Main and AUX channel with balance, bass, treble, loudness, volume
– 5-band graphic equalizer for Main channel
– Dolby Surround Pro Logic Adaptive Matrix
– Micronas Effect Matrix
– Micronas “3D-Panorama” virtualizer compliant to “Virtual Dolby Surround” technology
– Micronas Panorama sound mode (3D Surround sound via two loudspeakers)
– Noise Generator
– Spatial Effect for Surround
– 30-ms Surround delay
– Surround matrix control: Adaptive/Passive/Effect
– Center mode control: Normal/Phantom/Wide/Off
– Surround reproduction control: Rear speaker, Front speaker, Panorama, 3D-Panorama
– Two digital input/output pins controlled by I2C bus
Fig. 1–2 shows a typical Dolby Digital application using DPL 4519G, MSP 4450G, and MAS 3528E.
Micronas
5
5 Page 
www.DaPtaRShEeLeItM4UI.NcoAmRY DATA SHEET
DPL 4519G
2.6.3. Application Tips for using 3D-PANORAMA
2.6.3.1. Sweet Spot
Good results are only obtained in a rather close area
along the middle axis between the two loudspeakers:
the sweet spot. Moving away from this position
degrades the effect.
2.6.3.2. Clipping
For the test at Dolby Labs, it is very important to have
no clipping effects even with worst case signals. The
I2S-prescale register has to be set to values of max
10hex (16dec). This is sufficient in terms of clipping.
However, it was found, that by reducing the prescale to
a value lower than 16dec more convincing effects are
generated in case of very high dynamic signals. A
value of 10dec is a good compromise between overall
volume and additional headroom.
Test signals: sine sweep with 0 dBFS; L only, R only,
L&R equal phase, L&R anti phase.
Listening tests: Dolby Trailers (train trailer, city trailer,
canyon trailer...)
2.6.3.3. Loudspeaker Requirements
The loudspeakers used and their positioning inside the
TV set will greatly influence the performance of the vir-
tualizer. The algorithm works with the direct sound
path. Reflected sound waves reduce the effect. So it’s
most important to have as much direct sound as possi-
ble, compared to indirect sound.
To obtain the approval for a TV set, Dolby Laboratories
require mounting the loudspeakers at the front of the
set. Loudspeakers radiating to the side of the TV set
will not produce convincing effects. Good directionality
of the loudspeakers towards the listener is optimal.
The virtualizer was specially developed for implemen-
tation in TV sets. Even for rather small stereo TV's, suf-
ficient sound effects can be obtained. For small sets,
the loudspeaker placement should be to the side of the
CRT; for large screen sets (or 16:9 sets), mounting the
loudspeakers below the CRT is acceptable (large sep-
aration is preferred, low frequency speakers should be
outmost to avoid cancellation effects). Using external
loudspeakers with a large stereo base will not create
optimal effects.
The loudspeakers should be able to reproduce a wide
frequency range. The most important frequency range
starts from 160 Hz and ranges up to 5 kHz.
Great care has to be taken with systems that use one
common subwoofer: A single loudspeaker cannot
reproduce virtual sound locations. The crossover fre-
quency must be lower than 120 Hz.
2.6.3.4. Cabinet Requirements
During listening tests at Dolby Laboratories, no reso-
nances in the cabinet should occur.
Good material to check for resonances are the Dolby
Trailers or other dynamic sound tracks.
2.6.4. Input and Output Levels for
Dolby Surround Pro Logic
The nominal input level (input sensitivity) for the I2S-
Inputs is −15 dBFS. The highest possible input level of
0 dBFS is accepted without internal overflow. The I2S-
prescale value should be set to values of max 0 dB
(16dec).
With higher prescale values lower input sensitivities
can be accommodated. A higher input sensitivity is not
possible, because at least 15 dB headroom is required
for every input according to the Dolby specifications.
A full-scale left only input (0 dBFS) will produce a full-
scale left only output (at 0 dB volume). The typical out-
put level is 1.37 Vrms for DACM_L. The same holds
true for right only signals (1.37 Vrms for DACM_R). A
full-scale input level on both inputs (Lin=Rin=0 dBFS)
will give a center only output with maximum level. A
full-scale input level on both inputs (but Lin and Rin
with inverted phases) will give a surround-only signal
with maximum level.
For reproducing Dolby Pro Logic according to its spec-
ifications, the center and surround outputs must be
amplified by 3 dB with respect to the L and R output
signals. This can be done in two ways:
1. By implementing 3 dB more amplification for center
and surround loudspeaker outputs.
2. By always selecting volume for L and R 3 dB lower
than center and surround. Method 1 is preferable,
as method 2 lowers the achievable SNR for left and
right signals by 3 dB.
2.7. SCART Signal Routing
2.7.1. SCART Out Select
The SCART Output Select block includes full matrix
switching facilities. The switches are controlled by the
ACB user register (see page page 30).
Micronas
11
11 Page | ||
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