M62465FP Datasheet, PDF (17/25 Pages) Mitsubishi Electric Semiconductor – Dolby Pro Logic Surround

M62465FP
Function Block Diagram
Lin
Rin
MIC
VREFA
AVcc
(+9 V)
AGND
(L+R)
2
(L−R)
2
S'
MIC
Noise
sequencer
Selector2
Adaptive
matrix
MIC
MIX
By-pass
Plo logic
Other
mute
Selector1
L Center
R
C
mode
control
C.Trimmer
(0 to −31 dB)
Wide
normal
phantom
ADD/SUB
OFF
3-stereo/mute
Modified BNR
BNR
OUT
Selector3
DOUT
S.Trimmer
(0 to −31 dB)
MOS
SU
EC
Digital delay
VOL
Delay mix SW
MCU Interface
Lout
Rout
Cout
CT
Sout
Dout
LO1
LO2
LO3
GND
Echo filter
Surround filter
7 kHz
LPF
AVDD VDD
REQ SCKDATA
(+5 V)
4 MHz
Block Name
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
Function
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.
REJ03F0219-0201 Rev.2.01 Mar 31, 2008
Page 17 of 24