HA12134A Datasheet, PDF (15/27 Pages) Hitachi Semiconductor – Dolby B-Type Noise Reduction System

12
HA12135A
10
8
6
HA12134A, HA12135A, HA12136A
12 V
16 V
–40 dB
8.0 V
–30 dB
4
2
0
100 200
–20 dB
–10 dB
0 dB
500 1 k 2 k 5 k 10 k 20 k 50 k 100 k
Frequency [Hz]
Figure 15 Encode Boost vs. Frequency
HA12135A
30
PB Out
NR–ON/OFF
20
REC Out
10
NR–OFF
0
100
300 600 1 k
3 k 6 k 10 k 30 k 60 k 100 k 300 k 600 k 1 M
Frequency [Hz]
Figure 16 REC Mode Output Gain vs. Frequency
Rev.3, Jun. 1999, page 15 of 27