DPL4519G View Datasheet(PDF) - Micronas

Part Name

Description

Manufacturer

DPL4519G

Sound Processor for Digital and Analog Surround Systems

Micronas 

DPL 4519G

PRELIMINARY DATA SHEET

2.2. Preprocessing I2S Input Signals

The I2S inputs can be adjusted in level by means of the

I2S prescale registers.

The I2S_3 interface is able to receive more than two

channels (see Section 2.6. on page 8). The incoming

signals can be resorted by a programmable matrix in

order to obtain a certain order, which means an unified

postprocessing afterwards.

Since the I2S_3 interface is asynchronous, incoming

sound signals with arbitrary sample rates in the range

of 8-48 kHz are interpolated to 48 kHz by means of an

adaptive high quality sample rate converter. Therefore

all subsequent processing is calculated on a fixed

sampling rate, which even can be synchronized to

I2S_WS e.g. to a MSP 4450 being locked to an incom-

ing NICAM signal.

2.3. Selection of Internal Processed

Surround Signals

Instead of having an multichannel input via the I2S_3

interface, a multichannel signal can be created by an

internal Dolby Pro Logic decoder. In that case chan-

nels 3..8 of the multichannel input are replaced by the

internally generated signals.

2.4. Source Selection and Output Channel Matrix

The Source Selector makes it possible to distribute all

source signals (I2S input signals) to the desired output

channels (Main, Aux, etc.). All input and output signals

can be processed simultaneously. Each source chan-

nel is identified by a unique source address.

For each output channel, the output channel matrix

can be set to sound A (left mono), sound B (right

mono), stereo, or mono (sound left and right).

2.5. Audio Baseband Processing

2.5.1. Main and Aux Outputs

The following baseband features are implemented in

the Main and Aux output channels: bass/treble, loud-

ness, balance, and volume. A square wave beeper can

be added to these outputs. The Main channel addition-

ally supports an equalizer function (this is not simulta-

neously available with bass/treble).

2.6. Surround Processing

2.6.1. Surround Processing Mode

Surround sound processing is controlled by three func-

tions:

The "Decoder Matrix" defines which method is used to

create a multichannel signal (L, C, R, S) out of a stereo

input.

The "Surround Reproduction" determines whether the

surround signal “S” is fed to surround speakers. If no

surround speaker is actually connected, it defines the

method that is used to create surround effects.

The “Center Mode” determines how the center signal

“C” is to be processed. It can be left unmodified, dis-

tributed to left and right, discarded or high pass fil-

tered, whereby the low pass signals are distributed to

left and right.

2.6.1.1. Decoder Matrix

The Decoder Matrix allows three settings:

– ADAPTIVE:

The Adaptive Matrix is used for Dolby Surround Pro

Logic. Even sound material not encoded in Dolby

Surround will produce good surround effects in this

mode. The use of the Adaptive Matrix requires a

license from Dolby Laboratories (See License

Notice on page 3).

– PASSIVE:

A simple fixed matrix is used for surround sound.

– EFFECT:

A fixed matrix that is used for mono sound and spe-

cial effects. With Adaptive or Passive Matrix no sur-

round signal is present in case of mono, moreover in

Adaptive mode even the left and right output chan-

nels carry no signal (or just low frequency signals in

case of Center Mode = NORMAL). If surround

sound is still required for mono signals, the Effect

Matrix can be used. This forces the surround chan-

nel to be active. The Effect Matrix can be used

together with 3D-PANORAMA. The result will be a

pseudo stereo effect or a broadened stereo image

respectively.

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