MITSUBISHI SOUND PROCESSOR ICs
S E R IE S
S E R IE S
50
M65849BFP
SINGLE CHIP SURROUND PROCESSOR
The LPF Of The Input & Output Stage Of The Digital Delay
The circuit of the LPF is as follows.
C2
C1,C2:External C
C1
10kW
SD
Internal of IC
11 or 19 pin
12 or 20 pin
13 or 21 pin
SD
LD
10kW
10kW
LAD
SD
LD
24kW
-
INPUT
OUTPUT
24kW
+
24kW
The accuracy of the internal resisters are about ±30%.
DELAY TIME
S
W
SD
9.2 ~ 49.2 ms
98.3 ~ 196.6 ms
(SHORT DELAY)
LD
(LONG DELAY)
The cut off frequency is calculated by the following formulas.
*
•Surround
1
fc=
2 x10kWx
C1xC2
C1xC2
•Echo
1
fc=
2 x24kWx
The quality factor (Q) is as follows under the conditions of both Short Delay & Long Delay.
C1
C2
1
3
Q=
At all the cut off frequency is decided by the external C.
We recommend C1=0.0047µF and C2=0.001µF.
Under this condition, fc and Q are as follows.
Surround
Echo
fc=7.3kHz
fc=3.1kHz
Q=0.72
* The Cut Off Frequency of LPF means the cut off frequency of the each stage (A/D & D/A)
and doesn't mean the total cut off frequency.
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