Section 4 - The Default Flow; Default Flow Structure; Main Channel - Analog Devices ADAV4601 System Design Document

SECTION 4 – THE DEFAULT FLOW
AUXINL1
AUXINR1
SDIN0
SDIN1
SDIN2/SRC2
CHANNEL B
SDIN3/SRC2
CHANNEL C
0x0127 0x0127
SRC1
SRC2
CHANNEL A
0x0126 0x0127 0x0127
SUB CHANNEL

DEFAULT FLOW STRUCTURE

The Default Flow consists of five parallel channels all of which are muted by default;
Main
Headphone
AUXOUT1
S/PDIF
SDO0

Main Channel

The core of the Default Flow is the Main Channel which provides the main audio processing; Volume, Lip Sync, AVC,
Spatailizer, EQ, Loudness, Dynamic Bass.
The Main Channel contains a crossover which splits the signal into a tweeter channel and a woofer channel. PWM1,
PWM2 output the tweeter. PWM3 and PWM4 output the woofer. By default AUXOUT3 outputs just the tweeter. It
can be configured using Bit 5 in register 0x0122 to output the sum of the tweeter and woofer.
The sub channel is created by adding the left and right woofer channels and diving by two and low pass filtering.
The woofer channel is unaffected by this. The sub channel is then looped back to the input muxes for output on
another channel.
The Main Channel provides a loop back at two points (after Lip Sync and after Loudness) where some of the signal
is then available as an input to any of the other muxes thereby providing a degree of processing to all other
channels.
ADAV4601 System Design Document
Rev.1 August 2009
0x0100 0x0102 0x0105 0x0106 0x0122 0x0107
BEEPER
0x0123
0x0100 0x0102 0x0118 0x0120
0x011A 0x011E
0x011B 0x011F
0x011C
0x011D
AUXOUTL1
AUXOUTR1
0x0101 0x0103 0x0121
SPDIF OUTL (SDOL1)
SPDIF OUTR (SDOR1)
0x0101 0x0103 0x0121
SDOL0
SDOR0
0x0101 0x0103 0x0121
Figure 34: Default Audio Flow for the ADAV4601
Analog Devices
0x010C
0x012C 0x010D
0x012D 0x010E
0x012E 0x010F
0x010A
0x0108
0x0114
0x0109
0x010A 0x010B 0x0110
0x0115
0x0111
0x0112
0x0113
HPOUTL1/AUXOUTL4
HPOUTR1/AUXOUTR4
0x0121
Confidential Information
Page 40
0x0116
PWM1 (LHIGH)/
+
AUXOUT3L
PWM2 (RHIGH)/
+
AUXOUT3R
0x0121
PWM3 (LLOW)
PWM4 (RLOW)
0x0121
0x0117
SUB
CHANNEL TO
INPUT
MUXES
0x0124