MITSUBISHI SOUND PROCESSOR ICs
50SERIES
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
C1,C2:External C
Internal of IC
11 or 19 pin
12 or 20 pin
SD 10kΩ
13 or 21 pin
SD 10kΩ
SD 10kΩ
INPUT
LD
24kΩ
LD
24kΩ
The accuracy of the internal resisters are about ±30%.
LAD
24kΩ
-
+
OUTPUT
DELAY TIME
SW
9.2 ~ 49.2 ms
98.3 ~ 196.6 ms
SD
(SHORT DELAY)
LD
(LONG DELAY)
* The cut off frequency is calculated by the following formulas.
•Surround
fc=
•Echo
fc=
1
2 x10kΩx
C1xC2
1
2 x24kΩx
C1xC2
The quality factor (Q) is as follows under the conditions of both Short Delay & Long Delay.
1 C1
Q=
3 C2
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 fc=7.3kHz Q=0.72
Echo
fc=3.1kHz
* 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.
MITSUBISHI
ELECTRIC
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