HA12163 Hitachi Semiconductor, HA12163 Datasheet - Page 20

• Manufacturer Part Number: HA12163
• Description: Audio Signal Processor for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)
• Manufacturer: Hitachi Semiconductor

HA12163 Series
8. Music Sensor Output (MS OUT)
Notes: 1. Supply voltage of MS OUT pin must be less than V
Rev.4, Jun. 1999, page 20 of 66
A. Normal mode
B. FF or REW mode
As for the internal circuit of music sensor block, music sensor output pin is connected to the collector of
Connection with microcomputer, design I
S is 6 dB up in case of the both channels.
A standard level of TAI pin is 30 mVrms and the gain for TAI to MS AMP input is 10, therefore,
A = MS AMP. gain (B dB)
C = The sensing level of music sensor
S = –7.3–B [dB]
NPN Type directly, therefore, output level will be “high” when sensing no signal. And output level
will be “low” when sensing signal.
2. MS V
* MSOUT
Gv1 20 log 1
f1
Gv2 20 log 1
f3
S 20 log
I
L
the other channel sensitivity of music sensor (S) is computed by the formula mentioned below.
2
2
DV
CC
CC
C14 100 k
Lo
C28 R26
pin and V
: sensing signal (about 1 V)
1
30
1
C
– MSOUT
R
10 A
L
1
R27
R28
R25
R26
[Hz], f4 25k [Hz]
[Hz], f 2 25 k [Hz]
CC
[dB]
pin are required the same voltage.
C = 130 mVrms (typ.)
Lo
[dB]
[dB]
*
L
at 1 mA typ.
CC
voltage.