HA12160 データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12160

Audio Signal Processor for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)

Hitachi -> Renesas Electronics 

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 IL at 1 mA typ.

IL

=

DVCC

– MSOUTLo *

RL

* MSOUTLo: sensing signal (about 1 V)

Notes: 1. Supply voltage of MS OUT pin must be less than VCC voltage.

2. MS VCC pin and VCC pin are required the same voltage.

Rev.4, Jun. 1999, page 20 of 66

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