m62465fp Renesas Electronics Corporation., m62465fp Datasheet - Page 17

• Manufacturer Part Number: m62465fp
• Description: Dolby Pro Logic Surround
• Manufacturer: Renesas Electronics Corporation.

M62465FP
Function Block Diagram
Input balance
Noise sequencer
Adaptive matrix
Center mode control
C.Trimmer, S.Trimmer
Modified BNR
ADD/SUB
Selector1
Selector2
Selector3
Selector4
Digital delay
Feedback
Mode sel (MOS)
VOL
MIC MIX
Delay mix SW
REJ03F0219-0201 Rev.2.01 Mar 31, 2008
Page 17 of 24
Block Name
VREFA
AGND
(+9 V)
AVcc
MIC
Rin
Lin
(L+R)
(L R)
2
2
SU
S'
MIC
Revises a level error between the input Lch and Rch for optimum decoder performance.
A simple noise sequencer circuit adjustment of output level.
Continuously analyze the two-channel matrixes audio input to determine the direction
and relative magnitude of encoded sound fields.
Possible to select 4-center mode position. (WIDE, NORMAL, PHANTOM, OFF)
This is the level adjustment volume of Cch and Sch. (0 to −30 dB: 1 dB/step)
This block restores the signal to its original spectrum while reducing noise and certain
cross talk signals in a final stage of the surround chain.
Select a positive phase signal or a negative phase signal with DIGITAL SPACE
SURROUND MODE.
This is a selective switch to select the output signal of Lout and Rout from BY-PASS,
PRO LOGIC, OTHER SUR and MUTE.
This is a selective switch to select the output signal of Sout from S′, L+R, L−R and MIC.
This is a selective switch to select the output signal of Sout from BNR out, Dout and
3STEREO/MUTE.
This is a switch to connect a simple noise sequencer output to ADAPTIVE MATRIX
stage for level adjustment.
Make 7 kinds of delay signal s. (15.4 ms to196.6 ms)
The delay function and CLK signal stop at the time of DELAY OFF MODE.
This mode is for suppress bad effect of digital noise.
This is a switch to select feedback mode (ON/OFF) for SURROUND MODE.
This is a switch to select feedback signal from surround signal and echo signal.
Control the ATT level of delay signal from 3 dB to −∞ (12-step)
This is a switch to mix microphone signal to a main signal (Lch, Rch) .
This is a switch to select output or not a mixed signal to DOUT pin.
MOS
EC
Selector2
sequencer
Surround filter
Echo filter
Noise
Digital delay
Adaptive
matrix
MIC
MIX
VOL
R
C
L
Modified BNR
Center
control
phantom
mode
normal
Wide
OFF
7 kHz
LPF
Function
3-stereo/mute
AVDD
(+5 V)
BNR
OUT
VDD
ADD/SUB
MCU Interface
DOUT
4 MHz
Plo logic
By-pass
Other
mute
Selector3
Delay mix SW
REQ
Selector1
(0 to 31 dB)
(0 to 31 dB)
C.Trimmer
S.Trimmer
SCK
DATA
Lout
Rout
Cout
CT
Sout
Dout
LO1
LO2
LO3
GND