HA12177 データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12177

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

Hitachi -> Renesas Electronics 

Gv1

Gv

[dB]

Gv2

HA12173 Series

f1

f2

Normal speed

f3

f4

FF or REV

10

100

1k

f [Hz]

Figure 5 Frequency Response

1. Normal mode

Gv1 = 20 log 1 + RR2278 [dB]

f1=

1

[Hz], f 2 = 25 k [Hz]

2 ⋅π ⋅C14⋅100 k

10 k

25 k

100 k

2. 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

⋅101⋅

A

[dB]

A = MS AMP. gain (B dB)

S = –7.3–B [dB]

C = 130 mVrms (typ.)

S is 6 dB up in case of the both channels.

C = The sensing level of music sensor

Rev.1, Nov. 1992, page 17 of 66

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