HA12163 Datasheet, PDF (20/66 Pages) Hitachi Semiconductor – Audio Signal Processor for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)

HA12163 Series
A. Normal mode
Gv1 = 20 log ^{}1 + ^{RR2278} [dB]
f1=
1
[Hz], f 2 = 25 k [Hz]
2 ⋅π ⋅C14⋅100 k
B. FF or REW mode
Gv
2
=
20
log
₁
+
R25
R26

[dB]
f3 =
1
[Hz], f4 = 25k [Hz]
2⋅π ⋅C28⋅ R26
A standard level of TAI pin is 30 mVrms and the gain for TAI to MS AMP input is 10, therefore,
the other channel sensitivity of music sensor (S) is computed by the formula mentioned below.
S
=
20
log


C
30
⋅
1
10 ⋅

A _
[ dB]
A = MS AMP. gain (B dB)
C = The sensing level of music sensor
S = –7.3–B [dB]
C = 130 mVrms (typ.)
S is 6 dB up in case of the both channels.
8. Music Sensor Output (MS OUT)
As for the internal circuit of music sensor block, music sensor output pin is connected to the collector of
NPN Type directly, therefore, output level will be “high” when sensing no signal. And output level
will be “low” when sensing signal.
Connection with microcomputer, design I_L at 1 mA typ.
I_L
=
DV_CC
– MSOUT_Lo *
R_L
* MSOUT_Lo: sensing signal (about 1 V)
Notes: 1. Supply voltage of MS OUT pin must be less than V_CC voltage.
2. MS V_CC pin and V_CC pin are required the same voltage.
Rev.4, Jun. 1999, page 20 of 66